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/****************************************************************************/
/**
*
* @file xdmaps_example_w_intr.c
*
*
* <pre>
* MODIFICATION HISTORY:
*
* Ver Who Date Changes
* ----- ------ -------- ----------------------------------------------
* 1.00 hbm 08/19/2010 First Release
* 1.01a nm 03/05/2012 Initializing DmaCmd structure compatible to armcc.
* Modified base address to secure register base
* address.
* 1.02a sg 05/16/2012 Some code cleanup and reorganisation of the
* functions within the example.
* 1.06a kpc 04/24/2012 Modified the APIs to make this file compatible with
* peripheral test suite.
* 2.1 kpc 08/23/2014 Fixed IAR compiler reported error.
* 2.3 ms 01/23/17 Modified xil_printf statement in main function to
* ensure that "Successfully ran" and "Failed" strings are
* available in all examples. This is a fix for CR-965028.
* </pre>
*
*****************************************************************************/
#include <stdio.h>
#include <stdlib.h>
#include "sleep.h"
#include "xparameters.h"
#include "xil_types.h"
#include "xil_assert.h"
#include "xil_io.h"
#include "xil_exception.h"
#include "xil_cache.h"
#include "xil_printf.h"
#include "xscugic.h"
#include "xdmaps.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.
*/
//改常量，从flatform看地址映射。但还没找到dma的？
#define DMA_DEVICE_ID XPAR_XDMAPS_1_DEVICE_ID
#define INTC_DEVICE_ID XPAR_SCUGIC_SINGLE_DEVICE_ID//gic
#define DMA_DONE_INTR_0 XPAR_XDMAPS_0_DONE_INTR_0//0通道isr（中断服务程序？
#define DMA_DONE_INTR_1 XPAR_XDMAPS_0_DONE_INTR_1
#define DMA_DONE_INTR_2 XPAR_XDMAPS_0_DONE_INTR_2
#define DMA_DONE_INTR_3 XPAR_XDMAPS_0_DONE_INTR_3
#define DMA_DONE_INTR_4 XPAR_XDMAPS_0_DONE_INTR_4
#define DMA_DONE_INTR_5 XPAR_XDMAPS_0_DONE_INTR_5
#define DMA_DONE_INTR_6 XPAR_XDMAPS_0_DONE_INTR_6
#define DMA_DONE_INTR_7 XPAR_XDMAPS_0_DONE_INTR_7
#define DMA_FAULT_INTR XPAR_XDMAPS_0_FAULT_INTR
#define TEST_ROUNDS 1 /* Number of loops that the Dma transfers run.测试轮数*/
#define DMA_LENGTH 1024 /* Length of the Dma Transfers数据长度 */
#define TIMEOUT_LIMIT 0x2000 /* Loop count for timeout 计数，超时？*/
/**************************** Type Definitions *******************************/
/***************** Macros (Inline Functions) Definitions *********************/
/************************** Function Prototypes ******************************/
int XDmaPs_Example_W_Intr(XScuGic *GicPtr, u16 DeviceId);
int SetupInterruptSystem(XScuGic *GicPtr, XDmaPs *DmaPtr);
void DmaDoneHandler(unsigned int Channel, XDmaPs_Cmd *DmaCmd,
void *CallbackRef);
/************************** Macro Definitions *****************************/
/************************** Variable Definitions *****************************/
#ifdef __ICCARM__
#pragma data_alignment=32
static int Src[DMA_LENGTH];
static int Dst[DMA_LENGTH];
#pragma data_alignment=4
#else
static int Src[DMA_LENGTH] __attribute__ ((aligned (32)));
//static int * Src = (int*)XPAR_AXI_BRAM_CTRL_0_S_AXI_BASEADDR;//助教的修改：把src弄成板上的地址？
已经是虚拟地址了，直接用就行
static int Dst[DMA_LENGTH] __attribute__ ((aligned (32)));
#endif
XDmaPs DmaInstance;
#ifndef TESTAPP_GEN
XScuGic GicInstance;
#endif
/****************************************************************************/
/**
*
* This is the main function for the DmaPs interrupt example.
*
* @param None.
*
* @return XST_SUCCESS to indicate success, otherwise XST_FAILURE.
*
* @note None.
*
****************************************************************************/
#ifndef TESTAPP_GEN
int main(void)
{
int Status;
Status = XDmaPs_Example_W_Intr(&GicInstance,DMA_DEVICE_ID);//调用
if (Status != XST_SUCCESS) {
xil_printf("Error: XDMaPs_Example_W_Intr failed\r\n");
return XST_FAILURE;
}
xil_printf("Successfully ran XDMaPs_Example_W_Intr\r\n");
return XST_SUCCESS;
}
#endif
/*****************************************************************************/
/**
*
* Interrupt Example to test the DMA.//这里只有写入，调用DmaDoneHandler负责回读检查
*ID是不是需要按具体的实现改？
* @param DeviceId is the Device ID of the DMA controller.
*
* @return XST_SUCCESS to indicate success, otherwise XST_FAILURE.
*
* @note None.
*
****************************************************************************/
int XDmaPs_Example_W_Intr(XScuGic *GicPtr, u16 DeviceId)
{
int Index;//循环变量
unsigned int Channel = 0;
int Status;
int TestStatus;
int TestRound;
int TimeOutCnt;
volatile int Checked[XDMAPS_CHANNELS_PER_DEV];//这是啥？
XDmaPs_Config *DmaCfg;
XDmaPs *DmaInst = &DmaInstance;
XDmaPs_Cmd DmaCmd;
memset(&DmaCmd, 0, sizeof(XDmaPs_Cmd));//给DmaCmd结构体分空间。dma直接使，不用经过axi。给
//用cmd控制dma读写
DmaCmd.ChanCtrl.SrcBurstSize = 4;//设置cmd参数
DmaCmd.ChanCtrl.SrcBurstLen = 4;
DmaCmd.ChanCtrl.SrcInc = 1;
DmaCmd.ChanCtrl.DstBurstSize = 4;
DmaCmd.ChanCtrl.DstBurstLen = 4;
DmaCmd.ChanCtrl.DstInc = 1;
DmaCmd.BD.SrcAddr = (u32) Src;//写
DmaCmd.BD.DstAddr = (u32) Dst;
DmaCmd.BD.Length = DMA_LENGTH * sizeof(int);
/*
* Initialize the DMA Driver
*/
DmaCfg = XDmaPs_LookupConfig(DeviceId);//由id找设备？
if (DmaCfg == NULL) {
return XST_FAILURE;
}
Status = XDmaPs_CfgInitialize(DmaInst,//初始化dma
DmaCfg,
DmaCfg->BaseAddress);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Setup the interrupt system.设置中断
*/
Status = SetupInterruptSystem(GicPtr, DmaInst);//子函数，不是库函数
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
TestStatus = XST_SUCCESS;//开始测试，初始化为成功，不成功段的代码改为fail
for (TestRound = 0; TestRound < TEST_ROUNDS; TestRound++) {
xil_printf("Test round %d\r\n", TestRound);
for (Channel = 0;
Channel < XDMAPS_CHANNELS_PER_DEV;
Channel++) { //一层循环channel XDMAPS_CHANNELS_PER_DEV是怎么来的？干什么的？
//每个通道都测
/* Initialize source 给源数据赋值*/
for (Index = 0; Index < DMA_LENGTH; Index++)
Src[Index] = DMA_LENGTH - Index;//已经在访存板上地址
/* Clear destination 清空结果数组*/
for (Index = 0; Index < DMA_LENGTH; Index++)
Dst[Index] = 0;
Checked[Channel] = 0;//每个channel检查结果初始化为0
/* Set the Done interrupt handler 设置完成中断？因为dma不经cpu控制，所以需要中断*/
XDmaPs_SetDoneHandler(DmaInst,//中断待？？？channel是什么？？怎么和设备映射的？？
Channel,
DmaDoneHandler, //DmaDoneHandler是子函数，如果有中断跳到这里
(void *)Checked);
Status = XDmaPs_Start(DmaInst, Channel, &DmaCmd, 0);//开始，之前cmd的参数已经设置好了
//cmd包括写什么，怎么写
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}//返回的是开始成功
TimeOutCnt = 0;
/* Now the DMA is done 计时等待完成，忙等中断，回写部分可参考*/
while (!Checked[Channel] //checked数组和中断连，不是和dma，dma给中断，中断给
&& TimeOutCnt < TIMEOUT_LIMIT) {
TimeOutCnt++;
}
if (TimeOutCnt >= TIMEOUT_LIMIT) {//超时
TestStatus = XST_FAILURE;
}
if (Checked[Channel] < 0) {
/* DMA controller failed 失败的中断*/
TestStatus = XST_FAILURE;
}
}
}
return TestStatus;
}
/******************************************************************************/
/**
*把系统连上中断，可以直接抄，但要改啥？？
* This function connects the interrupt handler of the interrupt controller to
* the processor. This function is seperate to allow it to be customized for
* each application. Each processor or RTOS may require unique processing to
* connect the interrupt handler.
*
* @param GicPtr is the GIC instance pointer. GIC是ARM公司提供的一个通用的中断控制器=驱动？
* @param DmaPtr is the DMA instance pointer. dma硬件？
*
* @return None.
*
* @note None.
*
****************************************************************************/
int SetupInterruptSystem(XScuGic *GicPtr, XDmaPs *DmaPtr)
{
int Status;
#ifndef TESTAPP_GEN //这是干什么的？没见过这个宏
XScuGic_Config *GicConfig;
Xil_ExceptionInit();//初始化溢出
/*
* Initialize the interrupt controller driver so that it is ready to
* use.初始化dma控制器
*/
GicConfig = XScuGic_LookupConfig(INTC_DEVICE_ID);//找设备，把设备赋给地址，待？？
if (NULL == GicConfig) {//没找着
return XST_FAILURE;
}
Status = XScuGic_CfgInitialize(GicPtr, GicConfig,//初始化fic，什么时候使什么？？
GicConfig->CpuBaseAddress);//config是板子上数据（设备设置，ptr是本地指针
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Connect the interrupt controller interrupt handler to the hardware
* interrupt handling logic in the processor.
*/
Xil_ExceptionRegisterHandler(XIL_EXCEPTION_ID_IRQ_INT,
(Xil_ExceptionHandler)XScuGic_InterruptHandler,//这都啥，填异常处理表？
GicPtr);
#endif
/*
* Connect the device driver handlers that will be called when an interrupt
* for the device occurs, the device driver handler performs the specific
* interrupt processing for the device
*/
/*
* Connect the Fault ISR 啥？错误中断处理程序？是中断都要连吗？
*/
Status = XScuGic_Connect(GicPtr,
DMA_FAULT_INTR,
(Xil_InterruptHandler)XDmaPs_FaultISR,
(void *)DmaPtr);
if (Status != XST_SUCCESS) {
return XST_FAILURE;
}
/*
* Connect the Done ISR for all 8 channels of DMA 0 DMA都是8通道？连这个干什么的？
*/
Status = XScuGic_Connect(GicPtr,
DMA_DONE_INTR_0,
(Xil_InterruptHandler)XDmaPs_DoneISR_0,//这是一个xdmaps.c函数。没看懂干嘛的？？
(void *)DmaPtr);
Status |= XScuGic_Connect(GicPtr,
DMA_DONE_INTR_1,
(Xil_InterruptHandler)XDmaPs_DoneISR_1,
(void *)DmaPtr);
Status |= XScuGic_Connect(GicPtr,
DMA_DONE_INTR_2,
(Xil_InterruptHandler)XDmaPs_DoneISR_2,
(void *)DmaPtr);
Status |= XScuGic_Connect(GicPtr,
DMA_DONE_INTR_3,
(Xil_InterruptHandler)XDmaPs_DoneISR_3,
(void *)DmaPtr);
Status |= XScuGic_Connect(GicPtr,
DMA_DONE_INTR_4,
(Xil_InterruptHandler)XDmaPs_DoneISR_4,
(void *)DmaPtr);
Status |= XScuGic_Connect(GicPtr,
DMA_DONE_INTR_5,
(Xil_InterruptHandler)XDmaPs_DoneISR_5,
(void *)DmaPtr);
Status |= XScuGic_Connect(GicPtr,
DMA_DONE_INTR_6,
(Xil_InterruptHandler)XDmaPs_DoneISR_6,
(void *)DmaPtr);
Status |= XScuGic_Connect(GicPtr,
DMA_DONE_INTR_7,
(Xil_InterruptHandler)XDmaPs_DoneISR_7,
(void *)DmaPtr);
if (Status != XST_SUCCESS)
return XST_FAILURE;
/*使能所有通道的gic
* Enable the interrupts for the device
*/
XScuGic_Enable(GicPtr, DMA_DONE_INTR_0);
XScuGic_Enable(GicPtr, DMA_DONE_INTR_1);
XScuGic_Enable(GicPtr, DMA_DONE_INTR_2);
XScuGic_Enable(GicPtr, DMA_DONE_INTR_3);
XScuGic_Enable(GicPtr, DMA_DONE_INTR_4);
XScuGic_Enable(GicPtr, DMA_DONE_INTR_5);
XScuGic_Enable(GicPtr, DMA_DONE_INTR_6);
XScuGic_Enable(GicPtr, DMA_DONE_INTR_7);
XScuGic_Enable(GicPtr, DMA_FAULT_INTR);
Xil_ExceptionEnable();//使能异常，看来异常包括了中断
return XST_SUCCESS;
}
/*****************************************************************************/
/**
*
* DmaDoneHandler.
*
* @param Channel is the Channel number.
* @param DmaCmd is the Dma Command.
* @param CallbackRef is the callback reference data.
*
* @return None.
*
* @note None.
*
******************************************************************************/
void DmaDoneHandler(unsigned int Channel, XDmaPs_Cmd *DmaCmd, void *CallbackRef)
{
/* done handler */
volatile int *Checked = (volatile int *)CallbackRef;
int Index;
int Status = 1;
int *Src;//局部变量
int *Dst;
Src = (int *)DmaCmd->BD.SrcAddr;//重新赋值？
Dst = (int *)DmaCmd->BD.DstAddr;
/* DMA successful 不用手动存，dma自己存在了dst，把外存存到了内存（数组）*/
//怎么映射的？需要显示指明什么？
//怎么交互的？怎么指挥外存地址？src和dst存的什么？
/* compare the src and dst buffer */
for (Index = 0; Index < DMA_LENGTH; Index++) {
if ((Src[Index] != Dst[Index]) ||
(Dst[Index] != DMA_LENGTH - Index)) {
Status = -XST_FAILURE;
}
}
Checked[Channel] = Status;
}
