f407 串口1 用DMA发送发送400个数据，经常有数据没有发送完成

笨鸟先飞鱼 · 发表于 2015-12-1 16:29:29

stm32
f407 串口1 用DMA发送发送400个数据，经常有数据没有发送完成
串口DMA配置函数
void Usart1_DMA_Config(void)
{

DMA_InitTypeDef DMA_InitStructure;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2,ENABLE);

DMA_DeInit(DMA2_Stream7);

while (DMA_GetCmdStatus(DMA2_Stream7) != DISABLE){}

DMA_InitStructure.DMA_Channel =DMA_Channel_4;

DMA_InitStructure.DMA_PeripheralBaseAddr = USART1_DR_Base;

DMA_InitStructure.DMA_Memory0BaseAddr =(u32)SendBuff;

DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;

DMA_InitStructure.DMA_BufferSize = SENDBUFF_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_Normal;

DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;

DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;

DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;

DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;

DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;

DMA_Init(DMA2_Stream7, &DMA_InitStructure);

DMA_Cmd(DMA2_Stream7, DISABLE);


DMA_ITConfig(DMA2_Stream7,DMA_IT_TC,ENABLE);

}

main函数调用函数

void USART1_DMA4_SendData(uint16_t CharLength)

{

while (Flag_Uart_Send){;}

Flag_Uart_Send = 1;

DMA_Cmd(DMA2_Stream7,DISABLE);

while (DMA_GetCmdStatus(DMA2_Stream7) != DISABLE){}

DMA_SetCurrDataCounter(DMA2_Stream7,CharLength);

DMA_Cmd(DMA2_Stream7,ENABLE);

USART_DMACmd(USART1, USART_DMAReq_Tx, ENABLE);

}

DMA传输完成中断函数

void DMA2_Stream7_IRQHandler(void)
{

DMA_ClearFlag(DMA2_Stream7,DMA_FLAG_TCIF7);

DMA_Cmd(DMA2_Stream7,DISABLE);

Flag_Uart_Send = 0;
}