编写一个STM32F1芯片通过SPI2接口DMA模式接收数据程序
时间: 2024-03-02 07:53:43 浏览: 27
好的,下面是一个简单的程序示例,它使用STM32F1芯片通过SPI2接口DMA模式接收数据。
在本示例中,我们将使用SPI2和DMA1通道4来接收数据,数据将存储在名为data_buffer的全局数组中。我们将使用DMA模式循环缓冲区,以便在接收到指定数量的数据后自动重新启动传输。
```c
#include "stm32f10x.h"
#define BUFFER_SIZE 256
uint8_t data_buffer[BUFFER_SIZE];
void SPI2_Init(void)
{
// Enable clock for SPI2
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
// Initialize SPI2
SPI_InitTypeDef SPI_InitStructure;
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_Low;
SPI_InitStructure.SPI_CPHA = SPI_CPHA_1Edge;
SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_256;
SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
SPI_InitStructure.SPI_CRCPolynomial = 7;
SPI_Init(SPI2, &SPI_InitStructure);
// Enable SPI2
SPI_Cmd(SPI2, ENABLE);
}
void DMA_Init(void)
{
// Enable clock for DMA
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
// Initialize DMA
DMA_InitTypeDef DMA_InitStructure;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&SPI2->DR;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&data_buffer;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = BUFFER_SIZE;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel4, &DMA_InitStructure);
// Enable DMA
DMA_Cmd(DMA1_Channel4, ENABLE);
// Enable DMA interrupt
DMA_ITConfig(DMA1_Channel4, DMA_IT_TC, ENABLE);
}
void DMA_Start(void)
{
// Enable DMA
DMA_Cmd(DMA1_Channel4, ENABLE);
// Enable SPI2 DMA request
SPI_I2S_DMACmd(SPI2, SPI_I2S_DMAReq_Rx, ENABLE);
}
int main(void)
{
// Initialize SPI2 and DMA
SPI2_Init();
DMA_Init();
// Start DMA transfer
DMA_Start();
while (1) {
// Process data in buffer
// ...
}
}
void DMA1_Channel4_IRQHandler(void)
{
if (DMA_GetITStatus(DMA1_IT_TC4)) {
// DMA transfer complete
DMA_ClearITPendingBit(DMA1_IT_TC4);
// Restart DMA transfer
DMA_Start();
}
}
```
这个示例程序仅仅是一个框架,您需要根据具体的应用场景对其进行修改和完善。