CH58x/59x SPI0代码参考

前言：

代码参考为首字节模式和数据流模式，均使用DMA，建议使用数据流DMA。

一、数据流/首字节收发代码参考

数据流流程：

  1. 主机定时器1ms间隔发送；
  2. 从机接收数据；
  3. 从机填入发送数据到DMA并通知主机接收；
  4. 主机DMA接收数据；

首字节流程：

  1. 主机定时器1ms间隔发送；
  2. 从机首字节接收并DMA接收完整数据；
  3. 从机DMA发送数据并通知主机接收；
  4. 主机DMA接收数据；

注意：PA4作为从机通知主机提供clk波形功能，因此需接线主从机的PA4，可以修改为其他GPIO。

主机收发代码：

#include "CH59x_common.h"
 
__attribute__((aligned(4))) UINT8 tx_buff[32] ={0x1,0x55,0x2,0x55,0x3,0x55,0x4,0x55,0x5,0x55,
                                                0x1,0x55,0x2,0x55,0x3,0x55,0x4,0x55,0x5,0x55,
                                                0x1,0x55,0x2,0x55,0x3,0x55,0x4,0x55,0x5,0x55,
                                                0x1,0x55};
__attribute__((aligned(4))) UINT8 rx_buff[32];
uint8_t tx_len[60] = {0};
volatile uint8_t buf_judge[10];
 
void DebugInit(void){
    GPIOA_SetBits(GPIO_Pin_9);
    GPIOA_ModeCfg(GPIO_Pin_8, GPIO_ModeIN_PU);
    GPIOA_ModeCfg(GPIO_Pin_9, GPIO_ModeOut_PP_5mA);
    UART1_DefInit();
    UART1_BaudRateCfg(1500000);
}
 
VOID SPI_Init(){
    GPIOA_ModeCfg(GPIO_Pin_4, GPIO_ModeIN_PU);/*用于从机通知主机提供时钟，从机准备发送数据*/
    GPIOA_ITModeCfg(GPIO_Pin_4, GPIO_ITMode_FallEdge);
    PFIC_EnableIRQ(GPIO_A_IRQn);
 
    GPIOA_SetBits(GPIO_Pin_12);
    GPIOA_ModeCfg(GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14, GPIO_ModeOut_PP_5mA);
    GPIOA_ModeCfg(GPIO_Pin_15, GPIO_ModeIN_PU);
    SPI0_MasterDefInit();
    SPI0_CLKCfg(4);
    PFIC_EnableIRQ(SPI0_IRQn);
 
    tx_len[0] = sizeof(tx_buff);
    printf("tx_playload[0]:%d\n", tx_len[0]);
    for (uint8_t i=0; i<sizeof(tx_buff); i++){
        tx_len[1+i] = tx_buff[i];
    }
    PRINT("SPI0 Master Init\n");
}
 
int main(){
    SetSysClock(CLK_SOURCE_PLL_60MHz);
    DebugInit();/* 配置串口调试 */
    PRINT("Start @ChipID=%02X\n", R8_CHIP_ID);
 
    SPI_Init();    
    TMR0_TimerInit(FREQ_SYS / 1000);       // 设置定时时间 1ms
    TMR0_ITCfg(ENABLE, TMR0_3_IT_CYC_END); // 开启中断
    PFIC_EnableIRQ(TMR0_IRQn);
 
    while(1){
        if(buf_judge[0] != 0){
            printf("%x %x\n",buf_judge[0], buf_judge[1]);
            buf_judge[0] = 0;
        }
    }
}
 
__INTERRUPT
__HIGH_CODE
void SPI0_IRQHandler(void){
    if(R8_SPI0_INT_FLAG & RB_SPI_IF_DMA_END)
    {
        if(R8_SPI0_CTRL_MOD&RB_SPI_FIFO_DIR)
        {
            GPIOA_SetBits(GPIO_Pin_12);
            buf_judge[0] = rx_buff[30];
            buf_judge[1] = rx_buff[31];
            R8_SPI0_CTRL_CFG &= ~RB_SPI_DMA_ENABLE;
            R16_SPI0_DMA_BEG = 0x3300;                 //更改DMA地址，出中断
            R8_SPI0_INT_FLAG |= RB_SPI_IF_DMA_END|RB_SPI_IF_CNT_END;
            R8_SPI0_INTER_EN &=~ (RB_SPI_IE_DMA_END|RB_SPI_IE_CNT_END);
            R8_SPI0_CTRL_MOD &= ~RB_SPI_FIFO_DIR;
        }
        if(!(R8_SPI0_CTRL_MOD&RB_SPI_FIFO_DIR))//主机发送
        {
            R8_SPI0_INT_FLAG |= RB_SPI_IF_DMA_END;
        }
    }
    if((R8_SPI0_INT_FLAG & RB_SPI_IF_CNT_END)&&(!(R8_SPI0_CTRL_MOD&RB_SPI_FIFO_DIR)))
    {
        GPIOA_SetBits(GPIO_Pin_12);
        R8_SPI0_CTRL_CFG &= ~RB_SPI_DMA_ENABLE;
        R16_SPI0_DMA_BEG = 0x4300;                 //更改DMA地址，出中断
        R8_SPI0_INT_FLAG |= RB_SPI_IF_DMA_END|RB_SPI_IF_CNT_END;
        R8_SPI0_CTRL_MOD |= RB_SPI_FIFO_DIR;
        R8_SPI0_INTER_EN &=~ (RB_SPI_IE_DMA_END|RB_SPI_IE_CNT_END);
    }
}
 
__INTERRUPT
__HIGH_CODE
void GPIOA_IRQHandler(void){
    GPIOA_ClearITFlagBit(GPIO_Pin_4);
    GPIOA_ResetBits(GPIO_Pin_12);
    R8_SPI0_CTRL_MOD |= RB_SPI_FIFO_DIR;
    R16_SPI0_DMA_BEG = ((uint32_t)rx_buff);//从机先填DMA，主机再接收
    R16_SPI0_DMA_END = ((uint32_t)rx_buff+32);
    R16_SPI0_TOTAL_CNT = 32;
    R8_SPI0_INTER_EN |= RB_SPI_IE_DMA_END;
    R8_SPI0_CTRL_CFG |= RB_SPI_DMA_ENABLE;
}
 
__INTERRUPT
__HIGH_CODE
void TMR0_IRQHandler(void) // TMR0 定时中断
{
    if(TMR0_GetITFlag(TMR0_3_IT_CYC_END))
    {
        TMR0_ClearITFlag(TMR0_3_IT_CYC_END); // 清除中断标志
        GPIOA_ResetBits(GPIO_Pin_12);
        R8_SPI0_CTRL_MOD &= ~RB_SPI_FIFO_DIR;
        R16_SPI0_DMA_BEG = (uint32_t)tx_buff;
        R16_SPI0_DMA_END = (uint32_t)(tx_buff+32);
        R16_SPI0_TOTAL_CNT = 32;
        R8_SPI0_INTER_EN |= RB_SPI_IE_DMA_END;
        R8_SPI0_CTRL_CFG |= RB_SPI_DMA_ENABLE;
    }
}

从机收发代码：

#include "CH59x_common.h"
 
__attribute__((aligned(4))) UINT8 tx_buff[32]={0x1,0xaa,0x2,0xaa,0x3,0xaa,0x4,0xaa,0x5,0xaa,
                                                0x1,0xaa,0x2,0xaa,0x3,0xaa,0x4,0xaa,0x5,0xaa,
                                                0x1,0xaa,0x2,0xaa,0x3,0xaa,0x4,0xaa,0x5,0xaa,
                                                0x1,0xaa,};
__attribute__((aligned(4))) UINT8 rx_buff[32];
volatile uint8_t buf_judge[10];
volatile uint8_t len = 0;
 
void DebugInit(void){
    GPIOA_SetBits(GPIO_Pin_9);
    GPIOA_ModeCfg(GPIO_Pin_8, GPIO_ModeIN_PU);
    GPIOA_ModeCfg(GPIO_Pin_9, GPIO_ModeOut_PP_5mA);
    UART1_DefInit();
    UART1_BaudRateCfg(1500000);
}
 
VOID SPI_Init(){    /* 设备模式 */
    GPIOA_SetBits(GPIO_Pin_4);//PA4用于触发主机中断
    GPIOA_ModeCfg(GPIO_Pin_4, GPIO_ModeOut_PP_5mA);
 
    GPIOA_ModeCfg(GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14, GPIO_ModeIN_PU);/*SPI0 GPIOInit*/
    GPIOA_ModeCfg(GPIO_Pin_14, GPIO_ModeIN_PU);
    GPIOA_SetBits(GPIO_Pin_15);
    GPIOA_ModeCfg(GPIO_Pin_15, GPIO_ModeOut_PP_5mA);
 
    R8_SPI0_CTRL_MOD = RB_SPI_ALL_CLEAR;
    R8_SPI0_CTRL_MOD = RB_SPI_MODE_SLAVE;
    R8_SPI0_CTRL_MOD |= RB_SPI_FIFO_DIR;        //输入模式，接收数据
    R8_SPI0_CTRL_MOD &= ~(RB_SPI_MOSI_OE | RB_SPI_SCK_OE);
    R8_SPI0_CTRL_MOD |= RB_SPI_MISO_OE ;
 
    R16_SPI0_DMA_BEG = (UINT32)(rx_buff);
    R16_SPI0_DMA_END = (UINT32)((rx_buff)+32);
    R16_SPI0_TOTAL_CNT = 32;
    R8_SPI0_CTRL_CFG |= RB_SPI_DMA_ENABLE;
    R8_SPI0_INTER_EN |= RB_SPI_IE_DMA_END;
    PFIC_EnableIRQ(SPI0_IRQn);
    PRINT("SPI0 Slave Init\n");
}
 
int main(){
    SetSysClock(CLK_SOURCE_PLL_60MHz);
    DebugInit();
    PRINT("Start @ChipID=%02X\n", R8_CHIP_ID);
    SPI_Init();
    while(1){
        if(buf_judge[0] != 0){
            printf("%x %x\n", buf_judge[0], buf_judge[1]);
            buf_judge[0] = 0;
        }
    }
}
 
__attribute__((interrupt("WCH-Interrupt-fast")))
__attribute__((section(".highcode")))
void SPI0_IRQHandler(void){
    if((R8_SPI0_INT_FLAG & RB_SPI_IF_DMA_END)&&(R8_SPI0_CTRL_MOD&RB_SPI_FIFO_DIR)){
        buf_judge[0] = rx_buff[30];
        buf_judge[1] = rx_buff[31];
        R8_SPI0_CTRL_MOD &= ~RB_SPI_FIFO_DIR;    //从机接收到数据后，切换方向为发送
 
        R16_SPI0_DMA_BEG = (UINT32)(tx_buff); //从机先填DMA，主机再接收
        R16_SPI0_DMA_END = (UINT32)((tx_buff)+32);
        R16_SPI0_TOTAL_CNT = 32;    //从机模式下，由主机决定何时取走
        R8_SPI0_INT_FLAG |= RB_SPI_IF_DMA_END;//xxx 不要进中断立马清除标志
        GPIOA_ResetBits(GPIO_Pin_4);//xxx 从机发送中断通知脚。从机先填DMA，主机再接收
        GPIOA_SetBits(GPIO_Pin_4);
    }
    if((R8_SPI0_INT_FLAG & RB_SPI_IF_CNT_END)&&(!(R8_SPI0_CTRL_MOD&RB_SPI_FIFO_DIR))){
        R8_SPI0_CTRL_MOD |= RB_SPI_FIFO_DIR;    //从机发送数据完成后，切换方向为接收
 
        R16_SPI0_DMA_BEG = (UINT32)(rx_buff);
        R16_SPI0_DMA_END = (UINT32)((rx_buff)+32);
        R16_SPI0_TOTAL_CNT = 32;
        R8_SPI0_INT_FLAG |= RB_SPI_IF_CNT_END;
    }
}

二、波形参考：

三、注意事项

  • master模式下，MOSI的默认电平受到MISO影响，如果用来驱动诸如WS2812，需要把MISO悬空并且设置为低电平输出；
  • master模式下，spi传输时候，两个byte之间会插入一个系统时钟周期的时间。
posted @   SweetTea_lllpc  阅读(417)  评论(0)  编辑  收藏  举报
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