帮我写个stm32 spi驱动代码

好的，我可以回答这个问题。以下是一个简单的 STM32 SPI 驱动代码示例：

#include "stm32f4xx.h"

void SPI_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct;
SPI_InitTypeDef SPI_InitStruct;

// Enable clock for GPIOB
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE);

// Enable clock for SPI1
RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);

// Configure pins for SPI1
GPIO_InitStruct.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5;
GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOB, &GPIO_InitStruct);

// Connect SPI1 pins to AF5
GPIO_PinAFConfig(GPIOB, GPIO_PinSource3, GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource4, GPIO_AF_SPI1);
GPIO_PinAFConfig(GPIOB, GPIO_PinSource5, GPIO_AF_SPI1);

// Configure SPI1
SPI_InitStruct.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
SPI_InitStruct.SPI_Mode = SPI_Mode_Master;
SPI_InitStruct.SPI_DataSize = SPI_DataSize_8b;
SPI_InitStruct.SPI_CPOL = SPI_CPOL_Low;
SPI_InitStruct.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStruct.SPI_NSS = SPI_NSS_Soft;
SPI_InitStruct.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
SPI_InitStruct.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStruct.SPI_CRCPolynomial = 7;
SPI_Init(SPI1, &SPI_InitStruct);

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

void SPI_SendData(uint8_t data)
{
// Wait until transmit buffer is empty
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET);

// Send data
SPI_I2S_SendData(SPI1, data);

// Wait until receive buffer is not empty
while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET);

// Read received data to clear RXNE flag
SPI_I2S_ReceiveData(SPI1);
}

我希望这个代码对你有所帮助。