使用SPI3和DMA发送数据的代码。
时间: 2023-05-15 13:06:02 浏览: 125
以下是使用SPI3和DMA发送数据的示例代码:
```
#include "stm32f4xx.h"
void SPI3_DMA_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
SPI_InitTypeDef SPI_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
// Enable the SPI3 and DMA1 clocks
RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI3, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
// Configure the SPI3 pins
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_5;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOC, &GPIO_InitStructure);
// Connect SPI3 pins to the alternate function
GPIO_PinAFConfig(GPIOC, GPIO_PinSource3, GPIO_AF_SPI3);
GPIO_PinAFConfig(GPIOC, GPIO_PinSource4, GPIO_AF_SPI3);
GPIO_PinAFConfig(GPIOC, GPIO_PinSource5, GPIO_AF_SPI3);
// Configure the SPI3 peripheral
SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx;
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(SPI3, &SPI_InitStructure);
// Enable the SPI3 peripheral
SPI_Cmd(SPI3, ENABLE);
// Configure the DMA1 Channel 2
DMA_InitStructure.DMA_Channel = DMA_Channel_2;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&SPI3->DR;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)buffer;
DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
DMA_InitStructure.DMA_BufferSize = sizeof(buffer);
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_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA1_Stream7, &DMA_InitStructure);
// Enable the DMA1 Channel 2
DMA_Cmd(DMA1_Stream7, ENABLE);
// Enable the SPI3 DMA request
SPI_I2S_DMACmd(SPI3, SPI_I2S_DMAReq_Tx, ENABLE);
}
void SPI3_DMA_Send(uint8_t *data, uint16_t size)
{
// Wait for the SPI3 DMA transfer to complete
while (DMA_GetFlagStatus(DMA1_Stream7, DMA_FLAG_TCIF7) == RESET);
// Clear the SPI3 DMA transfer complete flag
DMA_ClearFlag(DMA1_Stream7, DMA_FLAG_TCIF7);
// Disable the DMA1 Channel 2
DMA_Cmd(DMA1_Stream7, DISABLE);
// Configure the DMA1 Channel 2
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)data;
DMA_InitStructure.DMA_BufferSize = size;
DMA_Init(DMA1_Stream7, &DMA_InitStructure);
// Enable the DMA1 Channel 2
DMA_Cmd(DMA1_Stream7, ENABLE);
}
```
请注意,这只是一个示例代码,您需要根据您的具体硬件和应用程序进行适当的修改。