使用标准库函数写一个stm32f4单片机实现GPIOB的PB5和PB9的SPI主机只发送与DMA传输的代码。
时间: 2024-09-25 12:15:06 浏览: 74
在STM32F4单片机上实现GPIOB的PB5和PB9作为SPI主机只发送数据并利用DMA进行高速传输,需要以下几个步骤:
首先,包括必要的头文件并初始化硬件资源:
```c
#include "stm32f4xx_hal.h"
#include " Spi_HAL_H.h"
void MX_GPIO_Init(void) {
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.Pin = GPIO_Pin_5 | GPIO_Pin_9;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_NOPULL;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF7_SPI5; // 使用SPI5的AF7组(通常是GPIOB)
HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
}
```
然后,配置SPI及其DMA:
```c
void MX_DMA_Init(void) {
DMA_HandleTypeDef hdma_spiflash;
hdma_spiflash.Instance = DMA1_Stream6;
hdma_spiflash.Init.Channel = DMA_CHANNEL_0;
hdma_spiflash.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_spiflash.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_spiflash.Init.MemInc = DMA_MINC_ENABLE;
hdma_spiflash.Init.PeriphDataAlignment = DMA_PDATAALIGN_BYTE;
hdma_spiflash.Init.MemDataAlignment = DMA_MDATAALIGN_BYTE;
hdma_spiflash.Init.Mode = DMA_NORMAL;
hdma_spiflash.Init.Priority = DMA_PRIORITY_LOW;
hdma_spiflash.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
hdma_spiflash.Init.Request = DMA请求; // 根据实际需求配置,例如DMA_REQUEST SPIx或多路复用请求
if (HAL_DMA_Init(&hdma_spiflash) != HAL_OK) {
Error_Handler();
}
// 连接DMA到SPI发送中断请求
HAL_NVIC_EnableIRQ(DMA1_Stream6_IRQn);
}
void MX_SPI5_Init(void) {
SPI_HandleTypeDef SpiHandle;
SpiHandle.Instance = SPI5;
SpiHandle.Init.Mode = SPI_MODE_MASTER;
SpiHandle.Init.Direction = SPI_DIRECTION_TX;
SpiHandle.Init.DataSize = SPI_DATASIZE_8BIT;
SpiHandle.Init.CLKPolarity = SPI_POLARITY_LOW;
SpiHandle.Init.CLKPhase = SPI_PHASE_1EDGE;
SpiHandle.Init.NSS = SPI_NSS_SOFT;
SpiHandle.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_2;
SpiHandle.Init.FirstBit = SPI_FIRSTBIT_MSB;
SpiHandle.Init.TIMode = SPI_TIMODE_DISABLE;
SpiHandle.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
SpiHandle.Init.CRCPolynomial = 10; // 根据你的校验算法选择合适的奇偶校验系数
SpiHandle.Init.NSSPMode = SPI_NSS_SOFT;
if (HAL_SPI_Init(&SpiHandle) != HAL_OK) {
Error_Handler();
}
}
```
接下来,你可以创建一个发送函数,其中使用DMA进行数据传输:
```c
void SendData(uint8_t* data, uint16_t length) {
static uint8_t transfer_buffer[TRANSFER_BUFFER_SIZE]; // 转移缓冲区
static uint16_t transfer_index = 0;
if (transfer_index == 0) {
HAL_DMA_Start_IT(&hdma_spiflash, (uint32_t)&data, (uint32_t)&transfer_buffer, length);
transfer_index = length;
} else {
HAL_DMA_LevelChange(&hdma_spiflash, DMA_Level_Change_Last);
while(HAL_DMA_Get Flag(DMA_FLAG_TCIF6)); // 等待传输完成
HAL_DMA_ClearFlag(&hdma_spiflash, DMA_FLAG_TCIF6);
HAL_DMA_Stop_IT(&hdma_spiflash);
memcpy(&transfer_buffer[transfer_index], data, length);
transfer_index += length;
HAL_DMA_Start_IT(&hdma_spiflash, (uint32_t)&data, (uint32_t)&transfer_buffer, length);
}
}
```
最后,记得配置DMA传输完成后触发的回调函数,并开启相关的中断:
```c
void DMA1_Stream6_IRQHandler(void) {
HAL_DMA_IRQHandler(&hdma_spiflash);
}
int main(void) {
// ... 其他初始化操作 ...
HAL_DMA_Start_IT(&hdma_spiflash, (uint32_t)NULL, (uint32_t)NULL, 0); // 初始化DMA
HAL_NVIC_EnableIRQ(DMA1_Stream6_IRQn); // 开启中断
// 发送数据...
SendData(some_data, some_length);
// ... 主循环 ...
}
```
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