谁用DMA连续接收过串口数据.急急急....

astwyg

谁用DMA连续接收过串口数据.急急急.... [复制链接]

DMA串口接受不能连续接.一次之后.清标志位.重配置都不行.我连RCC.NVIC都重配置了.这样几乎和第一次一样了...就是不能再次收...大家帮帮忙吧.麻烦大家了

上片段:

while(1)

{

LCD_ShowString(30,50,"please wait...");

TIM_Cmd(TIM2, ENABLE);

while(!timeup);

timeup=0;

GPSledon;

TIM_Cmd(TIM2, DISABLE);

LCD_ShowString(30,50,"getting GPS data...");

DMA_Configuration();

USART_DMACmd(USART1, USART_DMAReq_Rx, ENABLE);

DMA_Cmd(DMA1_Channel5, ENABLE);

// while(!DMAflag);

while (DMA_GetFlagStatus(DMA1_FLAG_TC5) == RESET);//while(!(DMA1->ISR&(1<<17)));//等待通道5传输完成

DMA_ClearFlag(DMA1_FLAG_GL5); //--调试部分

DMA_ClearFlag(DMA1_FLAG_TC5);

DMA_Cmd(DMA1_Channel5, DISABLE);

DMA_ClearFlag(DMA1_FLAG_GL5);

DMA_ClearFlag(DMA1_FLAG_TC5);

//DMA1->IFCR|=1<<17;//清除通道5传输完成标志

/* System Clocks Configuration */

RCC_Configuration();

/* NVIC configuration */

NVIC_Configuration();

/* Configure the GPIO ports */

USART1_Configuration(); //----------

LCD_Fill(30, 50, 200, 70,WHITE);

LCD_ShowString(30,115,(u8*)GPSdata);

GPSledoff;

if(GPSdataformat())

{

LCD_ShowString(30,220,"location and time:");

}

astwyg

真急啊这事 = =!

astwyg