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我尝试了很多天来通过 spi (stm32-nrf24..) 完成通信，尽管我已经阅读了很多资源，但它仍然无法正常工作，我无法做到正确，我不知道为什么会这样，我真的需要帮助。我有 nucleol053r8 和 nrf24l01，我想接受它们之间的通信。当我正在调试 spi 时，例如在 DR 上写一些东西然后阅读它，没有任何效果！似乎什么都没有写给 DR。我对此通信的配置是

  1. CPOL=CPHA=0
  2. 全双工模式
  3. 最高位优先
  4. 主模式开启
  5. 8位数据帧
  6. SSM=SSI=1

这是我的阅读和写作功能。

void spi1_transmit(uint8_t *data,uint32_t size){

uint32_t i=0;
uint8_t temp;

while (i<size){
    while (!READ_BIT(SPI1->SR,SPI_SR_TXE));
    SPI1->DR=data[i];
    i++;
}
while (!READ_BIT(SPI1->SR,SPI_SR_TXE));
while (READ_BIT(SPI1->SR,SPI_SR_BSY));
temp = SPI1->DR;
temp = SPI1->SR;

} void spi1_receive(uint8_t *data,uint32_t 大小){

while (size){
    SPI1->DR=0;
    while (!READ_BIT(SPI1->SR,SPI_SR_RXNE));
    *data++=(SPI1->DR);
    size--;
}

}

无效 spi1_gpio_init(){

/*Enable clock access to GPIOA*/
SET_BIT(RCC->IOPENR,IOPAEN);

/*Setting as AF functions the proper pins. */
CLEAR_BIT(GPIOA->MODER,(1U<<10)); // PA5
SET_BIT(GPIOA->MODER,(1U<<11));
CLEAR_BIT(GPIOA->OTYPER,(1U<<5));
SET_BIT(GPIOA->OSPEEDR,(1U<<10));
SET_BIT(GPIOA->OSPEEDR,(1U<<11));
// Setting AF type AF0.
CLEAR_BIT(GPIOA->AFR[0],(1U<<20));
CLEAR_BIT(GPIOA->AFR[0],(1U<<21));
CLEAR_BIT(GPIOA->AFR[0],(1U<<22));
CLEAR_BIT(GPIOA->AFR[0],(1U<<23));

CLEAR_BIT(GPIOA->MODER,(1U<<12)); //PA6
SET_BIT(GPIOA->MODER,(1U<<13));
CLEAR_BIT(GPIOA->OTYPER,(1U<<6));
SET_BIT(GPIOA->OSPEEDR,(1U<<12));
SET_BIT(GPIOA->OSPEEDR,(1U<<13));
// Setting AF type AF0.
CLEAR_BIT(GPIOA->AFR[0],(1U<<24));
CLEAR_BIT(GPIOA->AFR[0],(1U<<25));
CLEAR_BIT(GPIOA->AFR[0],(1U<<26));
CLEAR_BIT(GPIOA->AFR[0],(1U<<27));

CLEAR_BIT(GPIOA->MODER,(1U<<14)); //PA7
SET_BIT(GPIOA->MODER,(1U<<15));
CLEAR_BIT(GPIOA->OTYPER,(1U<<7));
SET_BIT(GPIOA->OSPEEDR,(1U<<14));
SET_BIT(GPIOA->OSPEEDR,(1U<<15));
// Setting AF type AF0.
CLEAR_BIT(GPIOA->AFR[0],(1U<<28));
CLEAR_BIT(GPIOA->AFR[0],(1U<<29));
CLEAR_BIT(GPIOA->AFR[0],(1U<<30));
CLEAR_BIT(GPIOA->AFR[0],(1U<<31));

SET_BIT(GPIOA->MODER,(1U<<18)); //PA9
CLEAR_BIT(GPIOA->MODER,(1U<<19));
CLEAR_BIT(GPIOA->OTYPER,(1U<<9));
SET_BIT(GPIOA->OSPEEDR,(1U<<18));
SET_BIT(GPIOA->OSPEEDR,(1U<<19));

SET_BIT(GPIOA->MODER,(1U<<16)); //PA8
CLEAR_BIT(GPIOA->MODER,(1U<<17));
CLEAR_BIT(GPIOA->OTYPER,(1U<<8));
SET_BIT(GPIOA->OSPEEDR,(1U<<16));
SET_BIT(GPIOA->OSPEEDR,(1U<<17));

} 无效 spi1_config(){

/*Enable clock access to SPI1.*/
SET_BIT(RCC->APB2ENR,SPI1_EN);

/*Setting up BAUDRATE. FPCLK/32 (100) */
SET_BIT(SPI1->CR1,(1U<<5));   // 1.
CLEAR_BIT(SPI1->CR1,(1U<<4)); // 0.
CLEAR_BIT(SPI1->CR1,(1U<<3)); // 0.

/*Setting up CPOL=0 and CPHA=0.*/
CLEAR_BIT(SPI1->CR1,(1U<<0)); // CPHA=0.
CLEAR_BIT(SPI1->CR1,(1U<<1)); // CPOL=0.

/*Enable full-duplex mode.*/
CLEAR_BIT(SPI1->CR1,(1U<<10));

/*Set MSB first.*/
CLEAR_BIT(SPI1->CR1,(1U<<7));

/*Enable Master mode.*/
SET_BIT(SPI1->CR1,(1U<<2));

/*Setting up 8-bit data frame.*/
CLEAR_BIT(SPI1->CR1,(1U<<11));

/*Enable software slave management. SSM=1 and SSI=1.*/
SET_BIT(SPI1->CR1,(1U<<9)); // SSM=1.
SET_BIT(SPI1->CR1,(1U<<8)); // SSI=1.
cs_disable();
ce_disable();

/*Enable SPI peripheral.*/
SET_BIT(SPI1->CR1,(1U<<6));

}

这就是为什么要测试它

诠释主要（无效）{

uint8_t tx_b[3],rx_b[3];
init_rcc();
spi1_gpio_init();
spi1_config();

tx_b[0]=0b00111111;
tx_b[1]=0b00001000;
tx_b[2]=0b00101000;
spi1_transmit(tx_b,3);
while(1){
    spi1_receive(rx_b,3);
}

}

4

1 回答 1

0
  1. 您需要启用 SPI 时钟
  2. 您需要启用外围设备
  3. 许多 STM32 SPI 都有 FIFO，您需要强制编译器生成正确的大小存储指令。

例如

*(volatile uint8_t *)&SPI1->DR = data[i];
于 2022-01-06T17:40:23.810 回答