CH579/CH57x/CH573/CH582/CH58x SPI使用

ch57x ch58x SPI说明

本文只是对wch 官方例程做的一个补充说明, 以下未特别说明的情况下皆为实际项目验证过的代码

适用芯片

• CH579/578/577
• CH573/CH571
• CH583/CH582/CH581
• CH565/569 (未验证)

SPI master

字节传输(全双工)

uint8_t ch57x_hal_spi_transfer(uint8_t data) {
    R8_SPI0_BUFFER = data;
    while( !(R8_SPI0_INT_FLAG & RB_SPI_FREE) );
    return ( R8_SPI0_BUFFER );
}

FIFO mode

阻塞模式

DMA mode

非阻塞+中断

(在ch582上测试，适用于ch58x，ch57x，ch59x)
头文件：

#include "CH58x_common.h"

typedef enum {
    SPI_MASTER_EVENT_DONE,      //< Transfer done.
} spi_master_evt_t;

typedef struct {
    spi_master_evt_t  type;      //< Event type.
} spi_evt_t;

typedef void (* spi_master_evt_handler_t)(spi_evt_t const * p_event);

uint8_t ch57x_hal_spi_dma_init(spi_master_evt_handler_t  handler);

uint8_t ch57x_hal_spi_dma_write(uint8_t *data,uint16_t length);

uint8_t ch57x_hal_spi_dma_read(uint8_t *data,uint16_t length);

c文件：

#include "ch57x_hal_spi_dma.h"

static spi_master_evt_handler_t m_spi_handles = NULL;

uint8_t ch57x_hal_spi_dma_init(spi_master_evt_handler_t  handler) {
    SPI0_MasterDefInit();
    SPI0_CLKCfg(60);
    m_spi_handles = handler;
    //NVIC_EnableIRQ( SPI0_IRQn );
    PFIC_EnableIRQ(SPI0_IRQn);
    return 0;
}

//length should <4096
uint8_t ch57x_hal_spi_dma_write(uint8_t *data,uint16_t length) {
    if(length >4095) {
        return 0xff;
    }
    R32_PA_DIR |= GPIO_Pin_14; //mosio out
    R8_SPI0_CTRL_MOD &= ~RB_SPI_FIFO_DIR; //out
    R16_SPI0_DMA_BEG = ((uint32_t)data)&0xffff;
    R16_SPI0_DMA_END = ((uint32_t)data + length)&0xffff;
    R16_SPI0_TOTAL_CNT = length;
    R8_SPI0_INT_FLAG = RB_SPI_IF_CNT_END | RB_SPI_IF_DMA_END; //clear flag
    R8_SPI0_INTER_EN |= RB_SPI_IE_CNT_END|RB_SPI_IE_DMA_END;  //enable flag
    R8_SPI0_CTRL_CFG |= RB_SPI_DMA_ENABLE;                    //start dma
    return 0;
}

//length should <4096
uint8_t ch57x_hal_spi_dma_read(uint8_t *data,uint16_t length) {
    if(length >4095) {
        return 0xff;
    }
    R32_PA_DIR &= ~GPIO_Pin_14; //mosi input

    R8_SPI0_CTRL_MOD |= RB_SPI_FIFO_DIR; //out
    R16_SPI0_DMA_BEG = ((uint32_t)data)&0xffff;
    R16_SPI0_DMA_END = ((uint32_t)data + length)&0xffff;
    R16_SPI0_TOTAL_CNT = length;

    R8_SPI0_INT_FLAG = RB_SPI_IF_CNT_END | RB_SPI_IF_DMA_END; //clear flag
    R8_SPI0_INTER_EN |= RB_SPI_IE_CNT_END|RB_SPI_IE_DMA_END;  //enable flag
    R8_SPI0_CTRL_CFG |= RB_SPI_DMA_ENABLE;
    return 0;
}


__attribute__((interrupt("WCH-Interrupt-fast")))
__attribute__((section(".highcode")))
void SPI0_IRQHandler(void){
    if( R8_SPI0_INT_FLAG & RB_SPI_IF_DMA_END ){ ///dma end
        R8_SPI0_CTRL_CFG &= ~RB_SPI_DMA_ENABLE; //dma stop
        R16_SPI0_DMA_BEG = 0;                   //reset dma begin address
        R8_SPI0_INT_FLAG = RB_SPI_IF_DMA_END;   //clear flag
    }
    if( R8_SPI0_INT_FLAG & RB_SPI_IF_CNT_END) { //total cnt transform end
            spi_evt_t evt;
            evt.type = SPI_MASTER_EVENT_DONE;
            m_spi_handles(&evt);
            R8_SPI0_INTER_EN &= ~RB_SPI_IE_CNT_END; //disable dma
            R8_SPI0_INT_FLAG = RB_SPI_IF_CNT_END;   //clear flag
    }
}

使用：

static volatile uint32_t spi_is_going = false;
#define spi_user_cs_low()   GPIOA_ResetBits(GPIO_Pin_12)
#define spi_user_cs_high()  GPIOA_SetBits(GPIO_Pin_12)

__attribute__((section(".highcode")))
void spi_dma_evt_handler(spi_evt_t const * p_event){
    switch(p_event->type){
        case SPI_MASTER_EVENT_DONE:
            spi_is_going = false;
            break;
        default:
            break;
    }
}

void spi0_init(void) {
    //spi0 gpio init
    GPIOA_ModeCfg(GPIO_Pin_12|GPIO_Pin_13|GPIO_Pin_14, GPIO_ModeOut_PP_5mA);
    GPIOA_ModeCfg(GPIO_Pin_15, GPIO_ModeIN_PU);

    ch57x_hal_spi_dma_init(spi_dma_evt_handler);
}

int main() {
    SetSysClock(CLK_SOURCE_PLL_60MHz);
    DebugInit();
    PRINT("Start @ChipID=%02X\n", R8_CHIP_ID);
    spi0_init();
    uint8_t tx_data[4095];
    uint8_t rx_data[4095];

    for(uint32_t i=0;i<sizeof(tx_data);i++) {
        tx_data[i] = i&0xff;
    }
    PRINT("spi start write and read\r\n");
    while(1) {
        spi_user_cs_low();
        spi_is_going = true;
        ch57x_hal_spi_dma_write(tx_data,16);
        while(spi_is_going);
        spi_user_cs_high();

        spi_user_cs_low();
        spi_is_going = true;
        ch57x_hal_spi_dma_read(rx_data,8);
        while(spi_is_going);
        spi_user_cs_high();
        DelayMs(100);
    }
}

详细代码,见附件

SPI slave

中断模式

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