STM32F103 SPI DMA收发（SPI2发送 SPI1接收）

目录

STM32 SPI DMA收发

GPIO初始化

SPI初始化

DMA初始化

问题记录

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STM32F103 SPI DMA收发

GPIO初始化

void my_spi_init(void)
{
	SPI_InitTypeDef SPI_InitStructure;
	GPIO_InitTypeDef GPIO_InitStructure;
	RCC_AHBPeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE); //开启AHB DMA外设时钟

	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOA, &GPIO_InitStructure);
	GPIO_SetBits(GPIOA, GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7);

	///////////////////////////////////////////////////////////////////////
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
	GPIO_Init(GPIOB, &GPIO_InitStructure);
	GPIO_SetBits(GPIOB, GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15);

	SPI_Configuration();
	DMA_Configuration(DMA1_Channel2, (u32)&SPI1->DR, (u32)spi1_rx_buf);
}

SPI初始化

void SPI_Configuration(void)
{
	SPI_InitTypeDef SPI_InitStructure;
	SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
	SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
	SPI_InitStructure.SPI_CPOL = SPI_CPOL_Low;
	SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
	SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
	SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_4;
	SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_LSB;
	SPI_InitStructure.SPI_CRCPolynomial = 7;

	SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
	SPI_Init(SPI2, &SPI_InitStructure);
	SPI_InitStructure.SPI_Mode = SPI_Mode_Slave;
	SPI_Init(SPI1, &SPI_InitStructure);

	SPI_SSOutputCmd(SPI2, ENABLE);

	SPI_Cmd(SPI1, ENABLE);
	SPI_Cmd(SPI2, ENABLE);
}

DMA初始化

void DMA_Configuration(DMA_Channel_TypeDef *DMA_CHx, u32 src_addr, u32 des_buf)
{
	//1 channel 2 src_addr 3 des_buf 4 direction 5 DMA_CMD
	DMA_InitTypeDef DMA_InitStructure;
	RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
	DMA_DeInit(DMA_CHx); //1

	DMA_InitStructure.DMA_PeripheralBaseAddr = src_addr; //2
	DMA_InitStructure.DMA_MemoryBaseAddr = des_buf;			 //3
	DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;	 //4
	DMA_InitStructure.DMA_BufferSize = 16;
	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; //16位
	DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
	DMA_InitStructure.DMA_Priority = DMA_Priority_High;
	DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;

	DMA_Init(DMA1_Channel2, &DMA_InitStructure);
	SPI_I2S_DMACmd(SPI1, SPI_I2S_DMAReq_Rx, ENABLE); //5
}

问题记录

1、SPI与USART3初始化DMA的互斥冲突,去除usart3的DMA初始化代码后，SPI1的DMA初始化正常。