c - STM32 & TLV5628 SPI 通信

Question

大家好，感谢您抽出时间。

我一直致力于连接 STM32f446RE Nucleo董事会与TLV5628 8 位八路串行 DAC。我遇到了多个问题，但当前的问题是以下两件事之一:

1) 数据线和时钟线显示完全相同的信息

或

2) 数据线显示信息，但时钟线上没有任何信息。

无论如何，所发布的信息是完全错误的。

这是我的设置代码:

void SPI_INIT(void){
// Enable clocks for C
    RCC->AHB1ENR |= RCC_AHB1ENR_GPIOCEN;

    // SPI GPIO
    GPIOC->MODER |= 2 << 3*2; // PC3 data pin
    GPIOC->MODER |= 2 << 7*2; // PC7 clock pin
    GPIOC->MODER |= 1 << 2*2; //pc2 load
    GPIOC->MODER |= 1 << 4*2; //pc4 ldac - probably set low permanently
    // Pins default to push-pull
    // set all to high speed
    GPIOC->OSPEEDR |= (3 << 2*2) | (3 << 3*2) | (3 << 4*2) | (3 << 7*2);
    GPIOC->AFR[0] |= 5<< 6*2; // Alt func 5 pc3 - SPI2
    GPIOC->AFR[0] |= 5 << 7*2; // Alt func 5 pc7 - SPI2
    // SPI Setup
    RCC->APB1ENR |= RCC_APB1ENR_SPI2EN; // Enable SPI Clock
    RCC->APB1RSTR |= RCC_APB1RSTR_SPI2RST; // reset SPI2
    RCC->APB1RSTR &= ~RCC_APB1RSTR_SPI2RST;// clear the reset

    // Control Register 1
    SPI2->CR1 &= ~SPI_CR1_SPE; // Disable SPI
    SPI2->CR1 |= SPI_CR1_MSTR; // master mode
    SPI2->CR1 &= ~SPI_CR1_RXONLY; // transmit, 0 == full duplex
    SPI2->CR1 &= ~SPI_CR1_DFF; // 8 bit format
    SPI2->CR1 &= ~SPI_CR1_LSBFIRST; // MSB first
    SPI2->CR1 &= ~SPI_CR1_CPOL;// low polarity, so 0 when idle
    SPI2->CR1 |=   4 << 3; // (180M/4)/32 = 1.41 MHz
    SPI2->CR1 |= SPI_CR1_CPHA; // first edge, look in data sheet
    //Questionable settings
    // Biderectional data line
    SPI2->CR1 |= SPI_CR1_BIDIMODE; // 1/17/2019 --> Check to see if this fixes something

    SPI2->CR1 |= SPI_CR1_BIDIOE; // idk if i need this
    //  CRC Polynomial Register
    SPI2->CRCPR = 10;

    // Control Register 2
    SPI2->CR2 |= 1<<2; // SS output enabled

    SPI2->CR1 |= SPI_CR1_SPE; // enable, has to be last
}

这是我的 SPI 写入代码:

void SPI_Write(int dacSelect, int adcData){

    while((SPI2->SR & SPI_SR_TXE) != 0);
    GPIOC->ODR |= 1 << 2; // load set high to read data
    SPI2->DR = dacArray[dacSelect]; // send address
    SPI2->DR = adcData; // send adc data
  while((SPI2->SR & SPI_SR_BSY) == SPI_SR_BSY);
    GPIOC->ODR &= ~(1 << 2); // Send load low to load data
    Delay(10); // short delay
    GPIOC->ODR |= 1 << 2;
}

Answer 1

您可以使用STMCubeMX为STM微处理器和板生成代码。以下代码块是从 STM32ubeMX 为 STM32F4 生成的。您应该更改传感器的波特率。

SPI_HandleTypeDef hspi;
SPI_HandleTypeDef SpiHandle;

void Spi_Initialize(void)
{
    /*##-1- Configure the SPI peripheral #######################################*/
    /* Set the SPI parameters */
    SpiHandle.Instance               = SPI2;
    SpiHandle.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_256;
    SpiHandle.Init.Direction         = SPI_DIRECTION_2LINES;
    SpiHandle.Init.CLKPhase          = SPI_PHASE_1EDGE;
    SpiHandle.Init.CLKPolarity       = SPI_POLARITY_LOW;
    SpiHandle.Init.DataSize          = SPI_DATASIZE_8BIT;
    SpiHandle.Init.FirstBit          = SPI_FIRSTBIT_MSB;
    SpiHandle.Init.TIMode            = SPI_TIMODE_DISABLE;
    SpiHandle.Init.CRCCalculation    = SPI_CRCCALCULATION_DISABLE;
    SpiHandle.Init.CRCPolynomial     = 7;
    SpiHandle.Init.NSS               = SPI_NSS_SOFT;
    SpiHandle.Init.Mode              = SPI_MODE_MASTER;

    if(HAL_SPI_Init(&SpiHandle) != HAL_OK)
    {
        while(1){};
    }
}

void Spi_Read(void )
{
    uint8_t SpiData[2];
    uint8_t tempmessage = 8;

    HAL_GPIO_WritePin(GPIOG,GPIO_PIN_8,RESET); // CS pin

    HAL_SPI_TransmitReceive(&hspi,&tempmessage,SpiData,2,5000); // Read Data

    HAL_GPIO_WritePin(GPIOG,GPIO_PIN_8,SET); // CS Pin
}

void Spi_Write(uint8_t *Data, uint8_t size)
{   
    HAL_GPIO_WritePin(GPIOG,GPIO_PIN_8,RESET); // CS pin

    HAL_SPI_Transmit(&hspi, Data, size, 5000); // Write Data

    HAL_GPIO_WritePin(GPIOG,GPIO_PIN_8,SET); // CS Pin
}