qspi_sdk_zynq

 

线性地址模式下下，只支持读，不支持写（spi to axi是数据，AXI TO SPI是指令转换）

 

所以更常用I/O模，因为可以读写。

 

自动模式在apb下要保持不断的发送，发送速度要大于接收速度。比较困难。

通常都用手动模式

 

 

 

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/*  * main.c  *  *  Created on: 2022年2月8日  *      Author: lht  */ /****************************************************************************** * * Copyright (C) 2010 - 2014 Xilinx, Inc.  All rights reserved. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to deal * in the Software without restriction, including without limitation the rights * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell * copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * Use of the Software is limited solely to applications: * (a) running on a Xilinx device, or * (b) that interact with a Xilinx device through a bus or interconnect. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL * XILINX  BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF * OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE * SOFTWARE. * * Except as contained in this notice, the name of the Xilinx shall not be used * in advertising or otherwise to promote the sale, use or other dealings in * this Software without prior written authorization from Xilinx. * ******************************************************************************/ /*****************************************************************************/ /** * * @file xqspips_flash_polled_example.c * * * This file contains a design example using the QSPI driver (XQspiPs) in * polled mode with a serial FLASH device. This examples performs * some transfers in Auto mode and Manual start mode, to illustrate the modes * available. It is recommended to use Manual CS + Auto start for * best performance. * The hardware which this example runs on. must have a serial FLASH (Numonyx * N25Q, Winbond W25Q, or Spansion S25FL) for it to run. This example has been * tested with the Numonyx Serial Flash (N25Q128). * * @note * * None. * * <pre> * MODIFICATION HISTORY: * * Ver   Who Date     Changes * ----- --- -------- ----------------------------------------------- * 1.00  sdm 11/25/10 First release * 1.01  srt 06/12/12 Changed to meet frequency requirements of READ command *                    for CR 663787 * 2.00a kka 22/08/12 Updated the example as XQspiPs_PolledTransfer API has *            changed. Changed the prescalar to use divide by 8. *            The user can change the prescalar to a maximum of *            divide by 2 based on the reference clock in the *            system. *            Set the Holdb_dr bit in the configuration register using *            XQSPIPS_HOLD_B_DRIVE_OPTION. Setting this bit *            drives the HOLD bit of the QSPI controller. *            This is required for QSPI to be used in Non QSPI boot *            mode else there needs to be an external pullup on this *            line. *            See http://www.xilinx.com/support/answers/47596.htm. * 2.01a sg  02/03/13 Created a function FlashReadID. Removed multiple *            initialization using SetOptions. *       ms  04/05/17 Modified Comment lines in functions to *                    recognize it as documentation block for doxygen *                    generation. *</pre> * ******************************************************************************/   /***************************** Include Files *********************************/   #include "xparameters.h"    /* SDK generated parameters */ #include "xqspips.h"        /* QSPI device driver 控制qspi控制器*/ #include "xil_printf.h"   /************************** Constant Definitions *****************************/   /*  * The following constants map to the XPAR parameters created in the  * xparameters.h file. They are defined here such that a user can easily  * change all the needed parameters in one place.  */ #define QSPI_DEVICE_ID      XPAR_XQSPIPS_0_DEVICE_ID   /*  * The following constants define the commands which may be sent to the FLASH  * device.  */ #define WRITE_STATUS_CMD    0x01 #define WRITE_CMD       0x02 #define READ_CMD        0x03 #define WRITE_DISABLE_CMD   0x04 #define READ_STATUS_CMD     0x05 #define WRITE_ENABLE_CMD    0x06 #define FAST_READ_CMD       0x0B #define DUAL_READ_CMD       0x3B #define QUAD_READ_CMD       0x6B #define BULK_ERASE_CMD      0xC7 #define SEC_ERASE_CMD       0xD8 #define READ_ID         0x9F   /*  * The following constants define the offsets within a FlashBuffer data  * type for each kind of data.  Note that the read data offset is not the  * same as the write data because the QSPI driver is designed to allow full  * duplex transfers such that the number of bytes received is the number  * sent and received    定义了一些偏移量.  */ #define COMMAND_OFFSET      0 /* FLASH instruction */ #define ADDRESS_1_OFFSET    1 /* MSB byte of address to read or write */ #define ADDRESS_2_OFFSET    2 /* Middle byte of address to read or write */ #define ADDRESS_3_OFFSET    3 /* LSB byte of address to read or write */ #define DATA_OFFSET     4 /* Start of Data for Read/Write  命令是一个字节，3个地址字节，所以数据是4*/ #define DUMMY_OFFSET        4 /* Dummy byte offset for fast, dual and quad 伪操作，dummy字节在fast/dual/quad read操作才会有                      reads */ #define DUMMY_SIZE      1 /* Number of dummy bytes for fast, dual and                      quad reads */ #define RD_ID_SIZE      4 /* Read ID command + 3 bytes ID response */ #define BULK_ERASE_SIZE     1 /* Bulk Erase command size */ #define SEC_ERASE_SIZE      4 /* Sector Erase command + Sector address */   /*  * The following constants specify the extra bytes which are sent to the  * FLASH on the QSPI interface, that are not data, but control information  * which includes the command and address  */ #define OVERHEAD_SIZE       4   //命令加地址总共4   /*  * The following constants specify the page size, sector size, and number of  * pages and sectors for the FLASH.  The page size specifies a max number of  * bytes that can be written to the FLASH with a single transfer.  */ #define SECTOR_SIZE     0x10000 //  扇区大小 #define NUM_SECTORS     0x100   //  多少个扇区 #define NUM_PAGES       0x10000 //  多少页 #define PAGE_SIZE       256     // 页的大小   /*  * Number of flash pages to be written.  */ #define PAGE_COUNT      16      //页的个数，相当于后面读写测试测试16页   /*  * Flash address to which data is ot be written.  */ #define TEST_ADDRESS        0x00055000  //定义测试的起始地址 #define UNIQUE_VALUE        0x05        //  相当于起始值，朝某个起始地址写入数据的时候这个值是多少 /*  * The following constants specify the max amount of data and the size of the  * the buffer required to hold the data and overhead to transfer the data to  * and from the FLASH.  */ #define MAX_DATA        PAGE_COUNT * PAGE_SIZE //读写测试量   /**************************** Type Definitions *******************************/   /***************** Macros (Inline Functions) Definitions *********************/   /************************** Function Prototypes ******************************/   void FlashErase(XQspiPs *QspiPtr, u32 Address, u32 ByteCount);   void FlashWrite(XQspiPs *QspiPtr, u32 Address, u32 ByteCount, u8 Command);   void FlashRead(XQspiPs *QspiPtr, u32 Address, u32 ByteCount, u8 Command);   int FlashReadID(void);   int QspiFlashPolledExample(XQspiPs *QspiInstancePtr, u16 QspiDeviceId);   /************************** Variable Definitions *****************************/   /*  * The instances to support the device drivers are global such that they  * are initialized to zero each time the program runs. They could be local  * but should at least be static so they are zeroed.  */ static XQspiPs QspiInstance;   /*  * The following variable allows a test value to be added to the values that  * are written to the FLASH such that unique values can be generated to  * guarantee the writes to the FLASH were successful  */ int Test = 5;   //向flash里写数据，每次写完累加的量   /*  * The following variables are used to read and write to the flash and they  * are global to avoid having large buffers on the stack  */ u8 ReadBuffer[MAX_DATA + DATA_OFFSET + DUMMY_SIZE]; //读出数据定义的数组 u8 WriteBuffer[PAGE_SIZE + DATA_OFFSET];    //写入数据定义的数组   /*****************************************************************************/ /** * * Main function to call the QSPI Flash example. * * @param    None * * @return   XST_SUCCESS if successful, otherwise XST_FAILURE. * * @note     None * ******************************************************************************/ int main(void) {     int Status;       xil_printf("QSPI FLASH Polled Example Test \r\n");       /*      * Run the Qspi Interrupt example.      */     Status = QspiFlashPolledExample(&QspiInstance, QSPI_DEVICE_ID);     if (Status != XST_SUCCESS) {         xil_printf("QSPI FLASH Polled Example Test Failed\r\n");         return XST_FAILURE;     }       xil_printf("Successfully ran QSPI FLASH Polled Example Test\r\n");     return XST_SUCCESS; }   /*****************************************************************************/ /** * * The purpose of this function is to illustrate how to use the XQspiPs * device driver in polled mode. This function writes and reads data * from a serial FLASH. * * @param    None. * * @return   XST_SUCCESS if successful, else XST_FAILURE. * * @note     None. * *****************************************************************************/ int QspiFlashPolledExample(XQspiPs *QspiInstancePtr, u16 QspiDeviceId) {     int Status;     u8 *BufferPtr;     u8 UniqueValue;     int Count;     int Page;     XQspiPs_Config *QspiConfig;       /*      * Initialize the QSPI driver so that it's ready to use      */     QspiConfig = XQspiPs_LookupConfig(QspiDeviceId);     if (NULL == QspiConfig) {         return XST_FAILURE;     }       Status = XQspiPs_CfgInitialize(QspiInstancePtr, QspiConfig,                     QspiConfig->BaseAddress);     if (Status != XST_SUCCESS) {         return XST_FAILURE;     }       /*      * Perform a self-test to check hardware build      */     Status = XQspiPs_SelfTest(QspiInstancePtr);     if (Status != XST_SUCCESS) {         return XST_FAILURE;     }       /*      * Initialize the write buffer for a pattern to write to the FLASH      * and the read buffer to zero so it can be verified after the read,      * the test value that is added to the unique value allows the value      * to be changed in a debug environment to guarantee    初始化和赋值      * 一开始进来4+（5+5）【unique=5,test=5,data_offset=4】      */     for (UniqueValue = UNIQUE_VALUE, Count = 0; Count < PAGE_SIZE;          Count++, UniqueValue++) {         WriteBuffer[DATA_OFFSET + Count] = (u8)(UniqueValue + Test);     }     memset(ReadBuffer, 0x00, sizeof(ReadBuffer));//清零readbuffer数据，方便跟writebuffer数据比较       /*      * Set Manual Start and Manual Chip select options and drive HOLD_B      * pin high.    设置成手动开始，手动片选信号。hold B是保持引脚，为低电平时暂停对flash操作      */     XQspiPs_SetOptions(QspiInstancePtr, XQSPIPS_MANUAL_START_OPTION |             XQSPIPS_FORCE_SSELECT_OPTION |             XQSPIPS_HOLD_B_DRIVE_OPTION);       /*      * Set the prescaler for QSPI clock 分频flash时钟      */     XQspiPs_SetClkPrescaler(QspiInstancePtr, XQSPIPS_CLK_PRESCALE_8);       /*      * Assert the FLASH chip select.    片选信号有效      */     XQspiPs_SetSlaveSelect(QspiInstancePtr);         FlashReadID();  //读flashid       /*      * Erase the flash.      */     FlashErase(QspiInstancePtr, TEST_ADDRESS, MAX_DATA);//写之前先擦除  此处只擦除测试范围       /*      * Write the data in the write buffer to the serial FLASH a page at a      * time, starting from TEST_ADDRESS     每个页分别写入数据      */     for (Page = 0; Page < PAGE_COUNT; Page++) {         FlashWrite(QspiInstancePtr, (Page * PAGE_SIZE) + TEST_ADDRESS,                PAGE_SIZE, WRITE_CMD);     }       /*      * Read the contents of the FLASH from TEST_ADDRESS, using Normal Read      * command. Change the prescaler as the READ command operates at a      * lower frequency.      */     FlashRead(QspiInstancePtr, TEST_ADDRESS, MAX_DATA, READ_CMD);//把数据从falsh里读出来，读出的数据存放在readbuffer       /*      * Setup a pointer to the start of the data that was read into the read      * buffer and verify the data read is the data that was written      */     BufferPtr = &ReadBuffer[DATA_OFFSET];       for (UniqueValue = UNIQUE_VALUE, Count = 0; Count < MAX_DATA;          Count++, UniqueValue++) {         if (BufferPtr[Count] != (u8)(UniqueValue + Test)) {             return XST_FAILURE;         }     }   //读到的数据跟测试的数据做比较，不一致返回错误的标志         //后面都是读的操作了     /*      * Read the contents of the FLASH from TEST_ADDRESS, using Fast Read      * command      */     memset(ReadBuffer, 0x00, sizeof(ReadBuffer));     FlashRead(QspiInstancePtr, TEST_ADDRESS, MAX_DATA, FAST_READ_CMD);       /*      * Setup a pointer to the start of the data that was read into the read      * buffer and verify the data read is the data that was written      */     BufferPtr = &ReadBuffer[DATA_OFFSET + DUMMY_SIZE];       for (UniqueValue = UNIQUE_VALUE, Count = 0; Count < MAX_DATA;          Count++, UniqueValue++) {         if (BufferPtr[Count] != (u8)(UniqueValue + Test)) {             return XST_FAILURE;         }     }       /*      * Read the contents of the FLASH from TEST_ADDRESS, using Dual Read      * command      */     memset(ReadBuffer, 0x00, sizeof(ReadBuffer));     FlashRead(QspiInstancePtr, TEST_ADDRESS, MAX_DATA, DUAL_READ_CMD);       /*      * Setup a pointer to the start of the data that was read into the read      * buffer and verify the data read is the data that was written      */     BufferPtr = &ReadBuffer[DATA_OFFSET + DUMMY_SIZE];       for (UniqueValue = UNIQUE_VALUE, Count = 0; Count < MAX_DATA;          Count++, UniqueValue++) {         if (BufferPtr[Count] != (u8)(UniqueValue + Test)) {             return XST_FAILURE;         }     }       /*      * Read the contents of the FLASH from TEST_ADDRESS, using Quad Read      * command      */     memset(ReadBuffer, 0x00, sizeof(ReadBuffer));     FlashRead(QspiInstancePtr, TEST_ADDRESS, MAX_DATA, QUAD_READ_CMD);       /*      * Setup a pointer to the start of the data that was read into the read      * buffer and verify the data read is the data that was written      */     BufferPtr = &ReadBuffer[DATA_OFFSET + DUMMY_SIZE];       for (UniqueValue = UNIQUE_VALUE, Count = 0; Count < MAX_DATA;          Count++, UniqueValue++) {         if (BufferPtr[Count] != (u8)(UniqueValue + Test)) {             return XST_FAILURE;         }     }       /*      * Initialize the write buffer for a pattern to write to the FLASH      * and the read buffer to zero so it can be verified after the read,      * the test value that is added to the unique value allows the value      * to be changed in a debug environment to guarantee      */     for (UniqueValue = UNIQUE_VALUE, Count = 0; Count < PAGE_SIZE;          Count++, UniqueValue++) {         WriteBuffer[DATA_OFFSET + Count] = (u8)(UniqueValue + Test);     }     memset(ReadBuffer, 0x00, sizeof(ReadBuffer));       /*      * Set Auto Start and Manual Chip select options and drive HOLD_B      * pin high.      */     XQspiPs_SetOptions(QspiInstancePtr, XQSPIPS_FORCE_SSELECT_OPTION |             XQSPIPS_HOLD_B_DRIVE_OPTION);       /*      * Erase the flash.      */     FlashErase(QspiInstancePtr, TEST_ADDRESS, MAX_DATA);       /*      * Write the data in the write buffer to the serial FLASH a page at a      * time, starting from TEST_ADDRESS      */     for (Page = 0; Page < PAGE_COUNT; Page++) {         FlashWrite(QspiInstancePtr, (Page * PAGE_SIZE) + TEST_ADDRESS,                PAGE_SIZE, WRITE_CMD);     }       /*      * Read the contents of the FLASH from TEST_ADDRESS, using Normal Read      * command. Change the prescaler as the READ command operates at a      * lower frequency.      */     FlashRead(QspiInstancePtr, TEST_ADDRESS, MAX_DATA, READ_CMD);       /*      * Setup a pointer to the start of the data that was read into the read      * buffer and verify the data read is the data that was written      */     BufferPtr = &ReadBuffer[DATA_OFFSET];       for (UniqueValue = UNIQUE_VALUE, Count = 0; Count < MAX_DATA;          Count++, UniqueValue++) {         if (BufferPtr[Count] != (u8)(UniqueValue + Test)) {             return XST_FAILURE;         }     }       /*      * Read the contents of the FLASH from TEST_ADDRESS, using Fast Read      * command      */     memset(ReadBuffer, 0x00, sizeof(ReadBuffer));     FlashRead(QspiInstancePtr, TEST_ADDRESS, MAX_DATA, FAST_READ_CMD);       /*      * Setup a pointer to the start of the data that was read into the read      * buffer and verify the data read is the data that was written      */     BufferPtr = &ReadBuffer[DATA_OFFSET + DUMMY_SIZE];       for (UniqueValue = UNIQUE_VALUE, Count = 0; Count < MAX_DATA;          Count++, UniqueValue++) {         if (BufferPtr[Count] != (u8)(UniqueValue + Test)) {             return XST_FAILURE;         }     }       /*      * Read the contents of the FLASH from TEST_ADDRESS, using Dual Read      * command      */     memset(ReadBuffer, 0x00, sizeof(ReadBuffer));     FlashRead(QspiInstancePtr, TEST_ADDRESS, MAX_DATA, DUAL_READ_CMD);       /*      * Setup a pointer to the start of the data that was read into the read      * buffer and verify the data read is the data that was written      */     BufferPtr = &ReadBuffer[DATA_OFFSET + DUMMY_SIZE];       for (UniqueValue = UNIQUE_VALUE, Count = 0; Count < MAX_DATA;          Count++, UniqueValue++) {         if (BufferPtr[Count] != (u8)(UniqueValue + Test)) {             return XST_FAILURE;         }     }       /*      * Read the contents of the FLASH from TEST_ADDRESS, using Quad Read      * command      */     memset(ReadBuffer, 0x00, sizeof(ReadBuffer));     FlashRead(QspiInstancePtr, TEST_ADDRESS, MAX_DATA, QUAD_READ_CMD);       /*      * Setup a pointer to the start of the data that was read into the read      * buffer and verify the data read is the data that was written      */     BufferPtr = &ReadBuffer[DATA_OFFSET + DUMMY_SIZE];       for (UniqueValue = UNIQUE_VALUE, Count = 0; Count < MAX_DATA;          Count++, UniqueValue++) {         if (BufferPtr[Count] != (u8)(UniqueValue + Test)) {             return XST_FAILURE;         }     }       return XST_SUCCESS; }   /*****************************************************************************/ /** * * This function writes to the  serial FLASH connected to the QSPI interface. * All the data put into the buffer must be in the same page of the device with * page boundaries being on 256 byte boundaries. * * @param    QspiPtr is a pointer to the QSPI driver component to use. * @param    Address contains the address to write data to in the FLASH. * @param    ByteCount contains the number of bytes to write. * @param    Command is the command used to write data to the flash. QSPI *       device supports only Page Program command to write data to the *       flash. * * @return   None. * * @note     None. * ******************************************************************************/ void FlashWrite(XQspiPs *QspiPtr, u32 Address, u32 ByteCount, u8 Command) {     u8 WriteEnableCmd = { WRITE_ENABLE_CMD };     u8 ReadStatusCmd[] = { READ_STATUS_CMD, 0 };  /* must send 2 bytes */     u8 FlashStatus[2];       /*      * Send the write enable command to the FLASH so that it can be      * written to, this needs to be sent as a seperate transfer before      * the write      */     XQspiPs_PolledTransfer(QspiPtr, &WriteEnableCmd, NULL,                 sizeof(WriteEnableCmd));         /*      * Setup the write command with the specified address and data for the      * FLASH      */     WriteBuffer[COMMAND_OFFSET]   = Command;     WriteBuffer[ADDRESS_1_OFFSET] = (u8)((Address & 0xFF0000) >> 16);     WriteBuffer[ADDRESS_2_OFFSET] = (u8)((Address & 0xFF00) >> 8);     WriteBuffer[ADDRESS_3_OFFSET] = (u8)(Address & 0xFF);       /*      * Send the write command, address, and data to the FLASH to be      * written, no receive buffer is specified since there is nothing to      * receive      */     XQspiPs_PolledTransfer(QspiPtr, WriteBuffer, NULL,                 ByteCount + OVERHEAD_SIZE);       /*      * Wait for the write command to the FLASH to be completed, it takes      * some time for the data to be written      */     while (1) {         /*          * Poll the status register of the FLASH to determine when it          * completes, by sending a read status command and receiving the          * status byte          */         XQspiPs_PolledTransfer(QspiPtr, ReadStatusCmd, FlashStatus,                     sizeof(ReadStatusCmd));           /*          * If the status indicates the write is done, then stop waiting,          * if a value of 0xFF in the status byte is read from the          * device and this loop never exits, the device slave select is          * possibly incorrect such that the device status is not being          * read          */         if ((FlashStatus[1] & 0x01) == 0) {             break;         }     } }   /*****************************************************************************/ /** * * This function reads from the  serial FLASH connected to the * QSPI interface. * * @param    QspiPtr is a pointer to the QSPI driver component to use. * @param    Address contains the address to read data from in the FLASH. * @param    ByteCount contains the number of bytes to read. * @param    Command is the command used to read data from the flash. QSPI *       device supports one of the Read, Fast Read, Dual Read and Fast *       Read commands to read data from the flash. * * @return   None. * * @note     None. * ******************************************************************************/ void FlashRead(XQspiPs *QspiPtr, u32 Address, u32 ByteCount, u8 Command) {     /*      * Setup the write command with the specified address and data for the      * FLASH      */     WriteBuffer[COMMAND_OFFSET]   = Command;     WriteBuffer[ADDRESS_1_OFFSET] = (u8)((Address & 0xFF0000) >> 16);     WriteBuffer[ADDRESS_2_OFFSET] = (u8)((Address & 0xFF00) >> 8);     WriteBuffer[ADDRESS_3_OFFSET] = (u8)(Address & 0xFF);       if ((Command == FAST_READ_CMD) || (Command == DUAL_READ_CMD) ||         (Command == QUAD_READ_CMD)) {         ByteCount += DUMMY_SIZE;     }     /*      * Send the read command to the FLASH to read the specified number      * of bytes from the FLASH, send the read command and address and      * receive the specified number of bytes of data in the data buffer      */     XQspiPs_PolledTransfer(QspiPtr, WriteBuffer, ReadBuffer,//flash读出的数据存在readbuffer                 ByteCount + OVERHEAD_SIZE); }   /*****************************************************************************/ /** * * This function erases the sectors in the  serial FLASH connected to the * QSPI interface. * * @param    QspiPtr is a pointer to the QSPI driver component to use. * @param    Address contains the address of the first sector which needs to *       be erased. * @param    ByteCount contains the total size to be erased. * * @return   None. * * @note     None. * ******************************************************************************/ void FlashErase(XQspiPs *QspiPtr, u32 Address, u32 ByteCount) {     u8 WriteEnableCmd = { WRITE_ENABLE_CMD };     u8 ReadStatusCmd[] = { READ_STATUS_CMD, 0 };  /* must send 2 bytes */     u8 FlashStatus[2];     int Sector;       /*      * If erase size is same as the total size of the flash, use bulk erase      * command      */     if (ByteCount == (NUM_SECTORS * SECTOR_SIZE)) {         /*          * Send the write enable command to the FLASH so that it can be          * written to, this needs to be sent as a seperate transfer          * before the erase          */         XQspiPs_PolledTransfer(QspiPtr, &WriteEnableCmd, NULL,                   sizeof(WriteEnableCmd));           /*          * Setup the bulk erase command          */         WriteBuffer[COMMAND_OFFSET]   = BULK_ERASE_CMD;           /*          * Send the bulk erase command; no receive buffer is specified          * since there is nothing to receive          */         XQspiPs_PolledTransfer(QspiPtr, WriteBuffer, NULL,                     BULK_ERASE_SIZE);           /*          * Wait for the erase command to the FLASH to be completed          */         while (1) {             /*              * Poll the status register of the device to determine              * when it completes, by sending a read status command              * and receiving the status byte              */             XQspiPs_PolledTransfer(QspiPtr, ReadStatusCmd,                         FlashStatus,                         sizeof(ReadStatusCmd));               /*              * If the status indicates the write is done, then stop              * waiting; if a value of 0xFF in the status byte is              * read from the device and this loop never exits, the              * device slave select is possibly incorrect such that              * the device status is not being read              */             if ((FlashStatus[1] & 0x01) == 0) {                 break;             }         }           return;     }       /*      * If the erase size is less than the total size of the flash, use      * sector erase command      */     for (Sector = 0; Sector < ((ByteCount / SECTOR_SIZE) + 1); Sector++) {         /*          * Send the write enable command to the SEEPOM so that it can be          * written to, this needs to be sent as a seperate transfer          * before the write          */         XQspiPs_PolledTransfer(QspiPtr, &WriteEnableCmd, NULL,                     sizeof(WriteEnableCmd));           /*          * Setup the write command with the specified address and data          * for the FLASH          */         WriteBuffer[COMMAND_OFFSET]   = SEC_ERASE_CMD;         WriteBuffer[ADDRESS_1_OFFSET] = (u8)(Address >> 16);         WriteBuffer[ADDRESS_2_OFFSET] = (u8)(Address >> 8);         WriteBuffer[ADDRESS_3_OFFSET] = (u8)(Address & 0xFF);           /*          * Send the sector erase command and address; no receive buffer          * is specified since there is nothing to receive          */         XQspiPs_PolledTransfer(QspiPtr, WriteBuffer, NULL,                     SEC_ERASE_SIZE);           /*          * Wait for the sector erse command to the FLASH to be completed          */         while (1) {             /*              * Poll the status register of the device to determine              * when it completes, by sending a read status command              * and receiving the status byte              */             XQspiPs_PolledTransfer(QspiPtr, ReadStatusCmd,                         FlashStatus,                         sizeof(ReadStatusCmd));               /*              * If the status indicates the write is done, then stop              * waiting, if a value of 0xFF in the status byte is              * read from the device and this loop never exits, the              * device slave select is possibly incorrect such that              * the device status is not being read              */             if ((FlashStatus[1] & 0x01) == 0) {                 break;             }         }           Address += SECTOR_SIZE;     } }   /*****************************************************************************/ /** * * This function reads serial FLASH ID connected to the SPI interface. * * @param    None. * * @return   XST_SUCCESS if read id, otherwise XST_FAILURE. * * @note     None. * ******************************************************************************/ int FlashReadID(void) {     int Status;       /*      * Read ID in Auto mode.      */     WriteBuffer[COMMAND_OFFSET]   = READ_ID;     WriteBuffer[ADDRESS_1_OFFSET] = 0x23;       /* 3 dummy bytes */     WriteBuffer[ADDRESS_2_OFFSET] = 0x08;     WriteBuffer[ADDRESS_3_OFFSET] = 0x09;       Status = XQspiPs_PolledTransfer(&QspiInstance, WriteBuffer, ReadBuffer,                 RD_ID_SIZE);     if (Status != XST_SUCCESS) {         return XST_FAILURE;     }       xil_printf("FlashID=0x%x 0x%x 0x%x\n\r", ReadBuffer[1], ReadBuffer[2],            ReadBuffer[3]);       return XST_SUCCESS; }

　　

 

 

/* * main.c * *  Created on: 2022年2月8日 *      Author: lht *//******************************************************************************** Copyright (C) 2010 - 2014 Xilinx, Inc.  All rights reserved.** Permission is hereby granted, free of charge, to any person obtaining a copy* of this software and associated documentation files (the "Software"), to deal* in the Software without restriction, including without limitation the rights* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell* copies of the Software, and to permit persons to whom the Software is* furnished to do so, subject to the following conditions:** The above copyright notice and this permission notice shall be included in* all copies or substantial portions of the Software.** Use of the Software is limited solely to applications:* (a) running on a Xilinx device, or* (b) that interact with a Xilinx device through a bus or interconnect.** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL* XILINX  BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF* OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE* SOFTWARE.** Except as contained in this notice, the name of the Xilinx shall not be used* in advertising or otherwise to promote the sale, use or other dealings in* this Software without prior written authorization from Xilinx.*******************************************************************************//*****************************************************************************//**** @file xqspips_flash_polled_example.c*** This file contains a design example using the QSPI driver (XQspiPs) in* polled mode with a serial FLASH device. This examples performs* some transfers in Auto mode and Manual start mode, to illustrate the modes* available. It is recommended to use Manual CS + Auto start for* best performance.* The hardware which this example runs on. must have a serial FLASH (Numonyx* N25Q, Winbond W25Q, or Spansion S25FL) for it to run. This example has been* tested with the Numonyx Serial Flash (N25Q128).** @note** None.** <pre>* MODIFICATION HISTORY:** Ver   Who Date     Changes* ----- --- -------- -----------------------------------------------* 1.00  sdm 11/25/10 First release* 1.01  srt 06/12/12 Changed to meet frequency requirements of READ command*                    for CR 663787* 2.00akka 22/08/12 Updated the example as XQspiPs_PolledTransfer API has*     changed. Changed the prescalar to use divide by 8.*     The user can change the prescalar to a maximum of*     divide by 2 based on the reference clock in the*     system.*      Set the Holdb_dr bit in the configuration register using*     XQSPIPS_HOLD_B_DRIVE_OPTION. Setting this bit*     drives the HOLD bit of the QSPI controller.*     This is required for QSPI to be used in Non QSPI boot*     mode else there needs to be an external pullup on this*     line.*     See http://www.xilinx.com/support/answers/47596.htm.* 2.01a sg  02/03/13 Created a function FlashReadID. Removed multiple*     initialization using SetOptions.*       ms  04/05/17 Modified Comment lines in functions to*                    recognize it as documentation block for doxygen*                    generation.*</pre>*******************************************************************************/
/***************************** Include Files *********************************/
#include "xparameters.h"/* SDK generated parameters */#include "xqspips.h"/* QSPI device driver 控制qspi控制器*/#include "xil_printf.h"
/************************** Constant Definitions *****************************/
/* * The following constants map to the XPAR parameters created in the * xparameters.h file. They are defined here such that a user can easily * change all the needed parameters in one place. */#define QSPI_DEVICE_IDXPAR_XQSPIPS_0_DEVICE_ID
/* * The following constants define the commands which may be sent to the FLASH * device. */#define WRITE_STATUS_CMD0x01#define WRITE_CMD0x02#define READ_CMD0x03#define WRITE_DISABLE_CMD0x04#define READ_STATUS_CMD0x05#define WRITE_ENABLE_CMD0x06#define FAST_READ_CMD0x0B#define DUAL_READ_CMD0x3B#define QUAD_READ_CMD0x6B#define BULK_ERASE_CMD0xC7#defineSEC_ERASE_CMD0xD8#define READ_ID0x9F
/* * The following constants define the offsets within a FlashBuffer data * type for each kind of data.  Note that the read data offset is not the * same as the write data because the QSPI driver is designed to allow full * duplex transfers such that the number of bytes received is the number * sent and received定义了一些偏移量. */#define COMMAND_OFFSET0 /* FLASH instruction */#define ADDRESS_1_OFFSET1 /* MSB byte of address to read or write */#define ADDRESS_2_OFFSET2 /* Middle byte of address to read or write */#define ADDRESS_3_OFFSET3 /* LSB byte of address to read or write */#define DATA_OFFSET4 /* Start of Data for Read/Write  命令是一个字节，3个地址字节，所以数据是4*/#define DUMMY_OFFSET4 /* Dummy byte offset for fast, dual and quad 伪操作，dummy字节在fast/dual/quad read操作才会有     reads */#define DUMMY_SIZE1 /* Number of dummy bytes for fast, dual and     quad reads */#define RD_ID_SIZE4 /* Read ID command + 3 bytes ID response */#define BULK_ERASE_SIZE1 /* Bulk Erase command size */#define SEC_ERASE_SIZE4 /* Sector Erase command + Sector address */
/* * The following constants specify the extra bytes which are sent to the * FLASH on the QSPI interface, that are not data, but control information * which includes the command and address */#define OVERHEAD_SIZE4//命令加地址总共4
/* * The following constants specify the page size, sector size, and number of * pages and sectors for the FLASH.  The page size specifies a max number of * bytes that can be written to the FLASH with a single transfer. */#define SECTOR_SIZE0x10000 //扇区大小#define NUM_SECTORS0x100//多少个扇区#define NUM_PAGES0x10000 //多少页#define PAGE_SIZE256// 页的大小
/* * Number of flash pages to be written. */#define PAGE_COUNT16//页的个数，相当于后面读写测试测试16页
/* * Flash address to which data is ot be written. */#define TEST_ADDRESS0x00055000//定义测试的起始地址#define UNIQUE_VALUE0x05//相当于起始值，朝某个起始地址写入数据的时候这个值是多少/* * The following constants specify the max amount of data and the size of the * the buffer required to hold the data and overhead to transfer the data to * and from the FLASH. */#define MAX_DATAPAGE_COUNT * PAGE_SIZE //读写测试量
/**************************** Type Definitions *******************************/
/***************** Macros (Inline Functions) Definitions *********************/
/************************** Function Prototypes ******************************/
void FlashErase(XQspiPs *QspiPtr, u32 Address, u32 ByteCount);
void FlashWrite(XQspiPs *QspiPtr, u32 Address, u32 ByteCount, u8 Command);
void FlashRead(XQspiPs *QspiPtr, u32 Address, u32 ByteCount, u8 Command);
int FlashReadID(void);
int QspiFlashPolledExample(XQspiPs *QspiInstancePtr, u16 QspiDeviceId);
/************************** Variable Definitions *****************************/
/* * The instances to support the device drivers are global such that they * are initialized to zero each time the program runs. They could be local * but should at least be static so they are zeroed. */static XQspiPs QspiInstance;
/* * The following variable allows a test value to be added to the values that * are written to the FLASH such that unique values can be generated to * guarantee the writes to the FLASH were successful */int Test = 5;//向flash里写数据，每次写完累加的量
/* * The following variables are used to read and write to the flash and they * are global to avoid having large buffers on the stack */u8 ReadBuffer[MAX_DATA + DATA_OFFSET + DUMMY_SIZE]; //读出数据定义的数组u8 WriteBuffer[PAGE_SIZE + DATA_OFFSET];//写入数据定义的数组
/*****************************************************************************//**** Main function to call the QSPI Flash example.** @paramNone** @returnXST_SUCCESS if successful, otherwise XST_FAILURE.** @noteNone*******************************************************************************/int main(void){int Status;
xil_printf("QSPI FLASH Polled Example Test \r\n");
/* * Run the Qspi Interrupt example. */Status = QspiFlashPolledExample(&QspiInstance, QSPI_DEVICE_ID);if (Status != XST_SUCCESS) {xil_printf("QSPI FLASH Polled Example Test Failed\r\n");return XST_FAILURE;}
xil_printf("Successfully ran QSPI FLASH Polled Example Test\r\n");return XST_SUCCESS;}
/*****************************************************************************//**** The purpose of this function is to illustrate how to use the XQspiPs* device driver in polled mode. This function writes and reads data* from a serial FLASH.** @paramNone.** @returnXST_SUCCESS if successful, else XST_FAILURE.** @noteNone.******************************************************************************/int QspiFlashPolledExample(XQspiPs *QspiInstancePtr, u16 QspiDeviceId){int Status;u8 *BufferPtr;u8 UniqueValue;int Count;int Page;XQspiPs_Config *QspiConfig;
/* * Initialize the QSPI driver so that it's ready to use */QspiConfig = XQspiPs_LookupConfig(QspiDeviceId);if (NULL == QspiConfig) {return XST_FAILURE;}
Status = XQspiPs_CfgInitialize(QspiInstancePtr, QspiConfig,QspiConfig->BaseAddress);if (Status != XST_SUCCESS) {return XST_FAILURE;}
/* * Perform a self-test to check hardware build */Status = XQspiPs_SelfTest(QspiInstancePtr);if (Status != XST_SUCCESS) {return XST_FAILURE;}
/* * Initialize the write buffer for a pattern to write to the FLASH * and the read buffer to zero so it can be verified after the read, * the test value that is added to the unique value allows the value * to be changed in a debug environment to guarantee 初始化和赋值 * 一开始进来4+（5+5）【unique=5,test=5,data_offset=4】 */for (UniqueValue = UNIQUE_VALUE, Count = 0; Count < PAGE_SIZE;     Count++, UniqueValue++) {WriteBuffer[DATA_OFFSET + Count] = (u8)(UniqueValue + Test);}memset(ReadBuffer, 0x00, sizeof(ReadBuffer));//清零readbuffer数据，方便跟writebuffer数据比较
/* * Set Manual Start and Manual Chip select options and drive HOLD_B * pin high.设置成手动开始，手动片选信号。hold B是保持引脚，为低电平时暂停对flash操作 */XQspiPs_SetOptions(QspiInstancePtr, XQSPIPS_MANUAL_START_OPTION |XQSPIPS_FORCE_SSELECT_OPTION |XQSPIPS_HOLD_B_DRIVE_OPTION);
/* * Set the prescaler for QSPI clock 分频flash时钟 */XQspiPs_SetClkPrescaler(QspiInstancePtr, XQSPIPS_CLK_PRESCALE_8);
/* * Assert the FLASH chip select.片选信号有效 */XQspiPs_SetSlaveSelect(QspiInstancePtr);

FlashReadID();//读flashid
/* * Erase the flash. */FlashErase(QspiInstancePtr, TEST_ADDRESS, MAX_DATA);//写之前先擦除  此处只擦除测试范围
/* * Write the data in the write buffer to the serial FLASH a page at a * time, starting from TEST_ADDRESS每个页分别写入数据 */for (Page = 0; Page < PAGE_COUNT; Page++) {FlashWrite(QspiInstancePtr, (Page * PAGE_SIZE) + TEST_ADDRESS,   PAGE_SIZE, WRITE_CMD);}
/* * Read the contents of the FLASH from TEST_ADDRESS, using Normal Read * command. Change the prescaler as the READ command operates at a * lower frequency. */FlashRead(QspiInstancePtr, TEST_ADDRESS, MAX_DATA, READ_CMD);//把数据从falsh里读出来，读出的数据存放在readbuffer
/* * Setup a pointer to the start of the data that was read into the read * buffer and verify the data read is the data that was written */BufferPtr = &ReadBuffer[DATA_OFFSET];
for (UniqueValue = UNIQUE_VALUE, Count = 0; Count < MAX_DATA;     Count++, UniqueValue++) {if (BufferPtr[Count] != (u8)(UniqueValue + Test)) {return XST_FAILURE;}}//读到的数据跟测试的数据做比较，不一致返回错误的标志//后面都是读的操作了/* * Read the contents of the FLASH from TEST_ADDRESS, using Fast Read * command */memset(ReadBuffer, 0x00, sizeof(ReadBuffer));FlashRead(QspiInstancePtr, TEST_ADDRESS, MAX_DATA, FAST_READ_CMD);
/* * Setup a pointer to the start of the data that was read into the read * buffer and verify the data read is the data that was written */BufferPtr = &ReadBuffer[DATA_OFFSET + DUMMY_SIZE];
for (UniqueValue = UNIQUE_VALUE, Count = 0; Count < MAX_DATA;     Count++, UniqueValue++) {if (BufferPtr[Count] != (u8)(UniqueValue + Test)) {return XST_FAILURE;}}
/* * Read the contents of the FLASH from TEST_ADDRESS, using Dual Read * command */memset(ReadBuffer, 0x00, sizeof(ReadBuffer));FlashRead(QspiInstancePtr, TEST_ADDRESS, MAX_DATA, DUAL_READ_CMD);
/* * Setup a pointer to the start of the data that was read into the read * buffer and verify the data read is the data that was written */BufferPtr = &ReadBuffer[DATA_OFFSET + DUMMY_SIZE];
for (UniqueValue = UNIQUE_VALUE, Count = 0; Count < MAX_DATA;     Count++, UniqueValue++) {if (BufferPtr[Count] != (u8)(UniqueValue + Test)) {return XST_FAILURE;}}
/* * Read the contents of the FLASH from TEST_ADDRESS, using Quad Read * command */memset(ReadBuffer, 0x00, sizeof(ReadBuffer));FlashRead(QspiInstancePtr, TEST_ADDRESS, MAX_DATA, QUAD_READ_CMD);
/* * Setup a pointer to the start of the data that was read into the read * buffer and verify the data read is the data that was written */BufferPtr = &ReadBuffer[DATA_OFFSET + DUMMY_SIZE];
for (UniqueValue = UNIQUE_VALUE, Count = 0; Count < MAX_DATA;     Count++, UniqueValue++) {if (BufferPtr[Count] != (u8)(UniqueValue + Test)) {return XST_FAILURE;}}
/* * Initialize the write buffer for a pattern to write to the FLASH * and the read buffer to zero so it can be verified after the read, * the test value that is added to the unique value allows the value * to be changed in a debug environment to guarantee */for (UniqueValue = UNIQUE_VALUE, Count = 0; Count < PAGE_SIZE;     Count++, UniqueValue++) {WriteBuffer[DATA_OFFSET + Count] = (u8)(UniqueValue + Test);}memset(ReadBuffer, 0x00, sizeof(ReadBuffer));
/* * Set Auto Start and Manual Chip select options and drive HOLD_B * pin high. */XQspiPs_SetOptions(QspiInstancePtr, XQSPIPS_FORCE_SSELECT_OPTION |XQSPIPS_HOLD_B_DRIVE_OPTION);
/* * Erase the flash. */FlashErase(QspiInstancePtr, TEST_ADDRESS, MAX_DATA);
/* * Write the data in the write buffer to the serial FLASH a page at a * time, starting from TEST_ADDRESS */for (Page = 0; Page < PAGE_COUNT; Page++) {FlashWrite(QspiInstancePtr, (Page * PAGE_SIZE) + TEST_ADDRESS,   PAGE_SIZE, WRITE_CMD);}
/* * Read the contents of the FLASH from TEST_ADDRESS, using Normal Read * command. Change the prescaler as the READ command operates at a * lower frequency. */FlashRead(QspiInstancePtr, TEST_ADDRESS, MAX_DATA, READ_CMD);
/* * Setup a pointer to the start of the data that was read into the read * buffer and verify the data read is the data that was written */BufferPtr = &ReadBuffer[DATA_OFFSET];
for (UniqueValue = UNIQUE_VALUE, Count = 0; Count < MAX_DATA;     Count++, UniqueValue++) {if (BufferPtr[Count] != (u8)(UniqueValue + Test)) {return XST_FAILURE;}}
/* * Read the contents of the FLASH from TEST_ADDRESS, using Fast Read * command */memset(ReadBuffer, 0x00, sizeof(ReadBuffer));FlashRead(QspiInstancePtr, TEST_ADDRESS, MAX_DATA, FAST_READ_CMD);
/* * Setup a pointer to the start of the data that was read into the read * buffer and verify the data read is the data that was written */BufferPtr = &ReadBuffer[DATA_OFFSET + DUMMY_SIZE];
for (UniqueValue = UNIQUE_VALUE, Count = 0; Count < MAX_DATA;     Count++, UniqueValue++) {if (BufferPtr[Count] != (u8)(UniqueValue + Test)) {return XST_FAILURE;}}
/* * Read the contents of the FLASH from TEST_ADDRESS, using Dual Read * command */memset(ReadBuffer, 0x00, sizeof(ReadBuffer));FlashRead(QspiInstancePtr, TEST_ADDRESS, MAX_DATA, DUAL_READ_CMD);
/* * Setup a pointer to the start of the data that was read into the read * buffer and verify the data read is the data that was written */BufferPtr = &ReadBuffer[DATA_OFFSET + DUMMY_SIZE];
for (UniqueValue = UNIQUE_VALUE, Count = 0; Count < MAX_DATA;     Count++, UniqueValue++) {if (BufferPtr[Count] != (u8)(UniqueValue + Test)) {return XST_FAILURE;}}
/* * Read the contents of the FLASH from TEST_ADDRESS, using Quad Read * command */memset(ReadBuffer, 0x00, sizeof(ReadBuffer));FlashRead(QspiInstancePtr, TEST_ADDRESS, MAX_DATA, QUAD_READ_CMD);
/* * Setup a pointer to the start of the data that was read into the read * buffer and verify the data read is the data that was written */BufferPtr = &ReadBuffer[DATA_OFFSET + DUMMY_SIZE];
for (UniqueValue = UNIQUE_VALUE, Count = 0; Count < MAX_DATA;     Count++, UniqueValue++) {if (BufferPtr[Count] != (u8)(UniqueValue + Test)) {return XST_FAILURE;}}
return XST_SUCCESS;}
/*****************************************************************************//**** This function writes to the  serial FLASH connected to the QSPI interface.* All the data put into the buffer must be in the same page of the device with* page boundaries being on 256 byte boundaries.** @paramQspiPtr is a pointer to the QSPI driver component to use.* @paramAddress contains the address to write data to in the FLASH.* @paramByteCount contains the number of bytes to write.* @paramCommand is the command used to write data to the flash. QSPI*device supports only Page Program command to write data to the*flash.** @returnNone.** @noteNone.*******************************************************************************/void FlashWrite(XQspiPs *QspiPtr, u32 Address, u32 ByteCount, u8 Command){u8 WriteEnableCmd = { WRITE_ENABLE_CMD };u8 ReadStatusCmd[] = { READ_STATUS_CMD, 0 };  /* must send 2 bytes */u8 FlashStatus[2];
/* * Send the write enable command to the FLASH so that it can be * written to, this needs to be sent as a seperate transfer before * the write */XQspiPs_PolledTransfer(QspiPtr, &WriteEnableCmd, NULL,sizeof(WriteEnableCmd));

/* * Setup the write command with the specified address and data for the * FLASH */WriteBuffer[COMMAND_OFFSET]   = Command;WriteBuffer[ADDRESS_1_OFFSET] = (u8)((Address & 0xFF0000) >> 16);WriteBuffer[ADDRESS_2_OFFSET] = (u8)((Address & 0xFF00) >> 8);WriteBuffer[ADDRESS_3_OFFSET] = (u8)(Address & 0xFF);
/* * Send the write command, address, and data to the FLASH to be * written, no receive buffer is specified since there is nothing to * receive */XQspiPs_PolledTransfer(QspiPtr, WriteBuffer, NULL,ByteCount + OVERHEAD_SIZE);
/* * Wait for the write command to the FLASH to be completed, it takes * some time for the data to be written */while (1) {/* * Poll the status register of the FLASH to determine when it * completes, by sending a read status command and receiving the * status byte */XQspiPs_PolledTransfer(QspiPtr, ReadStatusCmd, FlashStatus,sizeof(ReadStatusCmd));
/* * If the status indicates the write is done, then stop waiting, * if a value of 0xFF in the status byte is read from the * device and this loop never exits, the device slave select is * possibly incorrect such that the device status is not being * read */if ((FlashStatus[1] & 0x01) == 0) {break;}}}
/*****************************************************************************//**** This function reads from the  serial FLASH connected to the* QSPI interface.** @paramQspiPtr is a pointer to the QSPI driver component to use.* @paramAddress contains the address to read data from in the FLASH.* @paramByteCount contains the number of bytes to read.* @paramCommand is the command used to read data from the flash. QSPI*device supports one of the Read, Fast Read, Dual Read and Fast*Read commands to read data from the flash.** @returnNone.** @noteNone.*******************************************************************************/void FlashRead(XQspiPs *QspiPtr, u32 Address, u32 ByteCount, u8 Command){/* * Setup the write command with the specified address and data for the * FLASH */WriteBuffer[COMMAND_OFFSET]   = Command;WriteBuffer[ADDRESS_1_OFFSET] = (u8)((Address & 0xFF0000) >> 16);WriteBuffer[ADDRESS_2_OFFSET] = (u8)((Address & 0xFF00) >> 8);WriteBuffer[ADDRESS_3_OFFSET] = (u8)(Address & 0xFF);
if ((Command == FAST_READ_CMD) || (Command == DUAL_READ_CMD) ||    (Command == QUAD_READ_CMD)) {ByteCount += DUMMY_SIZE;}/* * Send the read command to the FLASH to read the specified number * of bytes from the FLASH, send the read command and address and * receive the specified number of bytes of data in the data buffer */XQspiPs_PolledTransfer(QspiPtr, WriteBuffer, ReadBuffer,//flash读出的数据存在readbufferByteCount + OVERHEAD_SIZE);}
/*****************************************************************************//**** This function erases the sectors in the  serial FLASH connected to the* QSPI interface.** @paramQspiPtr is a pointer to the QSPI driver component to use.* @paramAddress contains the address of the first sector which needs to*be erased.* @paramByteCount contains the total size to be erased.** @returnNone.** @noteNone.*******************************************************************************/void FlashErase(XQspiPs *QspiPtr, u32 Address, u32 ByteCount){u8 WriteEnableCmd = { WRITE_ENABLE_CMD };u8 ReadStatusCmd[] = { READ_STATUS_CMD, 0 };  /* must send 2 bytes */u8 FlashStatus[2];int Sector;
/* * If erase size is same as the total size of the flash, use bulk erase * command */if (ByteCount == (NUM_SECTORS * SECTOR_SIZE)) {/* * Send the write enable command to the FLASH so that it can be * written to, this needs to be sent as a seperate transfer * before the erase */XQspiPs_PolledTransfer(QspiPtr, &WriteEnableCmd, NULL,  sizeof(WriteEnableCmd));
/* * Setup the bulk erase command */WriteBuffer[COMMAND_OFFSET]   = BULK_ERASE_CMD;
/* * Send the bulk erase command; no receive buffer is specified * since there is nothing to receive */XQspiPs_PolledTransfer(QspiPtr, WriteBuffer, NULL,BULK_ERASE_SIZE);
/* * Wait for the erase command to the FLASH to be completed */while (1) {/* * Poll the status register of the device to determine * when it completes, by sending a read status command * and receiving the status byte */XQspiPs_PolledTransfer(QspiPtr, ReadStatusCmd,FlashStatus,sizeof(ReadStatusCmd));
/* * If the status indicates the write is done, then stop * waiting; if a value of 0xFF in the status byte is * read from the device and this loop never exits, the * device slave select is possibly incorrect such that * the device status is not being read */if ((FlashStatus[1] & 0x01) == 0) {break;}}
return;}
/* * If the erase size is less than the total size of the flash, use * sector erase command */for (Sector = 0; Sector < ((ByteCount / SECTOR_SIZE) + 1); Sector++) {/* * Send the write enable command to the SEEPOM so that it can be * written to, this needs to be sent as a seperate transfer * before the write */XQspiPs_PolledTransfer(QspiPtr, &WriteEnableCmd, NULL,sizeof(WriteEnableCmd));
/* * Setup the write command with the specified address and data * for the FLASH */WriteBuffer[COMMAND_OFFSET]   = SEC_ERASE_CMD;WriteBuffer[ADDRESS_1_OFFSET] = (u8)(Address >> 16);WriteBuffer[ADDRESS_2_OFFSET] = (u8)(Address >> 8);WriteBuffer[ADDRESS_3_OFFSET] = (u8)(Address & 0xFF);
/* * Send the sector erase command and address; no receive buffer * is specified since there is nothing to receive */XQspiPs_PolledTransfer(QspiPtr, WriteBuffer, NULL,SEC_ERASE_SIZE);
/* * Wait for the sector erse command to the FLASH to be completed */while (1) {/* * Poll the status register of the device to determine * when it completes, by sending a read status command * and receiving the status byte */XQspiPs_PolledTransfer(QspiPtr, ReadStatusCmd,FlashStatus,sizeof(ReadStatusCmd));
/* * If the status indicates the write is done, then stop * waiting, if a value of 0xFF in the status byte is * read from the device and this loop never exits, the * device slave select is possibly incorrect such that * the device status is not being read */if ((FlashStatus[1] & 0x01) == 0) {break;}}
Address += SECTOR_SIZE;}}
/*****************************************************************************//**** This function reads serial FLASH ID connected to the SPI interface.** @paramNone.** @returnXST_SUCCESS if read id, otherwise XST_FAILURE.** @noteNone.*******************************************************************************/int FlashReadID(void){int Status;
/* * Read ID in Auto mode. */WriteBuffer[COMMAND_OFFSET]   = READ_ID;WriteBuffer[ADDRESS_1_OFFSET] = 0x23;/* 3 dummy bytes */WriteBuffer[ADDRESS_2_OFFSET] = 0x08;WriteBuffer[ADDRESS_3_OFFSET] = 0x09;
Status = XQspiPs_PolledTransfer(&QspiInstance, WriteBuffer, ReadBuffer,RD_ID_SIZE);if (Status != XST_SUCCESS) {return XST_FAILURE;}
xil_printf("FlashID=0x%x 0x%x 0x%x\n\r", ReadBuffer[1], ReadBuffer[2],   ReadBuffer[3]);
return XST_SUCCESS;}