基于STM32F103与Spi通讯

首先，要使用SPI通讯，需要将STM32F103的SPI接口配置为主机模式或从机模式。接下来，需要定义SPI的时钟频率、传输模式、数据位数、CPOL和CPHA等参数。

然后，使用STM32F103的SPI库函数来发送和接收数据。在发送数据时，需要将数据写入发送缓冲区，然后等待发送完成。在接收数据时，需要等待接收完成，然后从接收缓冲区读取数据。

以下是一个基本的SPI通讯示例代码，仅供参考：

#include "stm32f10x.h"
#include "stm32f10x_spi.h"

void SPI_Configuration(void)
{
  SPI_InitTypeDef  SPI_InitStructure;

  /* Enable the SPI periph */
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);

  /* SPI1 configuration */
  SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
  SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
  SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
  SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
  SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
  SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
  SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_16;
  SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
  SPI_InitStructure.SPI_CRCPolynomial = 7;
  SPI_Init(SPI1, &SPI_InitStructure);

  /* Enable SPI1 */
  SPI_Cmd(SPI1, ENABLE);
}

uint8_t SPI_TransferByte(uint8_t data)
{
  /* Wait for SPI1 Tx buffer empty */
  while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);

  /* Send data */
  SPI_I2S_SendData(SPI1, data);

  /* Wait for SPI1 Rx buffer not empty */
  while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);

  /* Return received data */
  return SPI_I2S_ReceiveData(SPI1);
}

int main(void)
{
  uint8_t data = 0x55;

  /* SPI configuration */
  SPI_Configuration();

  /* Loop forever */
  while (1)
  {
    /* Send data */
    SPI_TransferByte(data);

    /* Delay */
    Delay(100);

    /* Receive data */
    data = SPI_TransferByte(0);
  }
}