[参考译文] LAUNCHXL-CC1310：CC1310与 LPS22HB 传感器之间的 SPI 通信-不存在时钟

https://e2e.ti.com/support/microcontrollers/arm-based-microcontrollers-group/arm-based-microcontrollers/f/arm-based-microcontrollers-forum/1313005/launchxl-cc1310-spi-communication-between-cc1310-and-lps22hb-sensor---no-clock-present

您好

我正在尝试编写函数来精简 CC1310和 LPS22HB 压力传感器之间的 SPI 通信。 除了不断初始化参数等、我想使用 SPI 为 r/w 函数提供一个函数。

对于 SPI_Write 函数：

bool SPI_Write(SPI_Handle spi_handle, SPI_Params spi_params,
                                    SPI_Transaction spi_transaction, uint8_t size,
                                    uint8_t *txBuffer)
{

    SPI_Params_init(&spi_params);
    spi_params.transferMode = SPI_MODE_BLOCKING;
    spi_params.bitRate = 10000000;
    spi_params.dataSize = 8;


    spi_handle = SPI_open(0, &spi_params);

    if (!spi_handle) {
        // Error opening SPI
        return false;
    }

    spi_transaction.count = size;
    spi_transaction.txBuf = txBuffer;
    spi_transaction.rxBuf = NULL;

    if(!SPI_transfer(spi_handle, &spi_transaction))
    {
        return false;
    }

    SPI_close(spi_handle);

    return true;
}

对于我的 SPI_READ 函数：

bool SPI_Read(SPI_Handle spi_handle, SPI_Params spi_params,
                                   SPI_Transaction spi_transaction, uint8_t size,
                                   uint8_t *rxBuffer)
{

    SPI_Params_init(&spi_params);
    spi_params.transferMode = SPI_MODE_BLOCKING;
    spi_params.bitRate = 10000000;
    spi_params.dataSize = 8;


    spi_handle = SPI_open(0, &spi_params);

    if (!spi_handle) {
        // Error opening SPI
        return false;
    }

    spi_transaction.count = size;
    spi_transaction.txBuf = NULL;
    spi_transaction.rxBuf = rxBuffer;

    if(!SPI_transfer(spi_handle, &spi_transaction))
    {
        false;
    }

    SPI_close(spi_handle);

    return true;
}

反过来、我的 LPS22HB 驱动器包含：

SPI_Transaction LPS22HB_SpiTransactionHandle;
SPI_Handle LPS22HB2_SpiHandle;
SPI_Params  LPS22HB_SpiParams;


#define TOGGLE_CS                               GPIO_write(Board_GPIO_TEST_DIO25, 0)
#define RELEASE_CS                              GPIO_write(Board_GPIO_TEST_DIO25, 1)

static void LPS22HB_Mem_Write(uint8_t reg, uint8_t *dataW, uint8_t size)
{

    uint8_t spiReg = reg;
    TOGGLE_CS; //sets the CS low

    SPI_Write(LPS22HB_SpiHandle, LPS22HB_SpiParams, LPS22HB_SpiTransactionHandle, 1, &spiReg);

    SPI_Write(LPS22HB_SpiHandle, LPS22HB_SpiParams, LPS22HB_SpiTransactionHandle, size, dataW);

    RELEASE_CS; //sets the CS high

}

static void LPS22HB_Mem_Read(uint8_t reg, uint8_t *dataR, uint8_t size)
{
    uint8_t spiBuf[1] = {0};
    spiBuf[0] = reg | 0x80;
    uint8_t i;

    TOGGLE_CS; //sets the CS low

    SPI_Write(LPS22HB_SpiHandle, LPS22HB_SpiParams, LPS22HB_SpiTransactionHandle, 1, spiBuf);

    SPI_Read(LPS22HB_SpiHandle, LPS22HB_SpiParams, LPS22HB_SpiTransactionHandle, size, dataR);

    RELEASE_CS; //sets the CS high
}

然后、我将尝试使用以下代码段读取 chip_id (传感器的"我是谁")、应为0xB1：

LPS22HB_Mem_Read(0x0f, ui8dummy, 1);

uint8_t ui8dummy[2]

if(strcmp(ui8dummy, "D") != 0)
{
return false;
}

当我读取 CHI-ID 时、如果我希望0xb1的值、由数据表给出、则我得到零。 我已经全面调试了 SPI R/W 代码。 我已经向 SPI_W/R 函数添加了断点、可以保证不会产生错误(这些函数不返回 false)。 我正在使用一个由"toggle"和"release"宏给出的软件芯片选择。 我已经在示波器上进行了检查、可以确认我的 CS 和时钟是否有效。 我将使用 CC1310 SDK 20.02.07版中的 uartEcho 示例。

我的驱动器中是否有任何明显错误使其无法正常工作？