基于STM32的SPI代码

下面是基于STM32的SPI代码示例，其中使用了STM32Cube HAL库：

#include "stm32f4xx.h"
#include "stm32f4xx_hal.h"

SPI_HandleTypeDef hspi1;

void SPI1_Init(void)
{
    /* SPI1 clock enable */
    __HAL_RCC_SPI1_CLK_ENABLE();

    /* SPI1 GPIO Configuration */
    GPIO_InitTypeDef GPIO_InitStruct = {0};
    /* GPIO clock enable */
    __HAL_RCC_GPIOA_CLK_ENABLE();
    /* Configure GPIO pin : PA5 */
    GPIO_InitStruct.Pin = GPIO_PIN_5;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF5_SPI1;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    /* Configure GPIO pin : PA6 */
    GPIO_InitStruct.Pin = GPIO_PIN_6;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF5_SPI1;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    /* Configure GPIO pin : PA7 */
    GPIO_InitStruct.Pin = GPIO_PIN_7;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF5_SPI1;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);

    /* SPI1 parameter configuration */
    hspi1.Instance = SPI1;
    hspi1.Init.Mode = SPI_MODE_MASTER;
    hspi1.Init.Direction = SPI_DIRECTION_2LINES;
    hspi1.Init.DataSize = SPI_DATASIZE_8BIT;
    hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
    hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
    hspi1.Init.NSS = SPI_NSS_SOFT;
    hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_256;
    hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
    hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
    hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
    hspi1.Init.CRCPolynomial = 7;
    hspi1.Init.CRCLength = SPI_CRC_LENGTH_DATASIZE;
    hspi1.Init.NSSPMode = SPI_NSS_PULSE_DISABLE;
    hspi1.Init.NSSPolarity = SPI_NSS_POLARITY_LOW;
    hspi1.Init.FifoThreshold = SPI_FIFO_THRESHOLD_01DATA;
    hspi1.Init.TxCRCInitializationPattern = SPI_CRC_INITIALIZATION_ALL_ZERO_PATTERN;
    hspi1.Init.RxCRCInitializationPattern = SPI_CRC_INITIALIZATION_ALL_ZERO_PATTERN;
    hspi1.Init.MasterSSIdleness = SPI_MASTER_SS_IDLENESS_00CYCLE;
    hspi1.Init.MasterInterDataIdleness = SPI_MASTER_INTERDATA_IDLENESS_00CYCLE;
    hspi1.Init.MasterReceiverAutoSusp = SPI_MASTER_RX_AUTOSUSP_DISABLE;
    hspi1.Init.MasterKeepIOState = SPI_MASTER_KEEP_IO_STATE_DISABLE;
    hspi1.Init.IOSwap = SPI_IOSWAP_DISABLE;
    HAL_SPI_Init(&hspi1);
}

void SPI1_Transmit(uint8_t* data, uint16_t size)
{
    HAL_SPI_Transmit(&hspi1, data, size, HAL_MAX_DELAY);
}

void SPI1_Receive(uint8_t* data, uint16_t size)
{
    HAL_SPI_Receive(&hspi1, data, size, HAL_MAX_DELAY);
}

void SPI1_TransmitReceive(uint8_t* tx_data, uint8_t* rx_data, uint16_t size)
{
    HAL_SPI_TransmitReceive(&hspi1, tx_data, rx_data, size, HAL_MAX_DELAY);
}

在上面的代码中，我们首先初始化了SPI1，并定义了三个SPI操作函数：`SPI1_Transmit()` 用于向SPI设备发送数据，`SPI1_Receive()` 用于从SPI设备接收数据，`SPI1_TransmitReceive()` 用于同时向设备发送和接收数据。请根据自己的需求选择相应的函数。