DMA串口1接收数据，发现无法把所有数据放在数组里，只会重叠

张氏拉都 · 发表于 2015-2-15 18:29:40

原子哥搭救搭救~~我使用的是串口1的接收，通过串口助手发送数据，希望保存在数组里，本来设置发送16个，但是发送6个，DMA就已经传输结束了。。数组也没数据

[mw_shl_code=c,true]#include "stm32f10x.h" #include "dma.h" #include "usart.h" #include "lcd.h" #include "delay.h" #include "led.h" #define buffsize 16 u8 rbuff[buffsize]; int main(void) { u8 i,j; delay_init(); uart_init(115200); LCD_Init(); Led_Init(); DMA_Config(DMA1_Channel5,(u32)&USART1->DR,(u32)rbuff,buffsize); POINT_COLOR = BLUE; LCD_ShowString(60,50,"DMA&USART test"); LCD_ShowString(60,70,"2015.02.15"); Led2 = 0; USART_DMACmd(USART1,USART_DMAReq_Rx,ENABLE); Open_DAM(DMA1_Channel5,(u32)buffsize); while(1) { while(1) { if(DMA_GetFlagStatus(DMA1_FLAG_TC5)!=RESET) { DMA_ClearFlag(DMA1_FLAG_TC5); Led2 = 1; break; } i=DMA_GetCurrDataCounter(DMA1_Channel5); LCD_ShowNum(60,170,i,3,16); } for(j=0;j<buffsize;j++) { printf("\r\n%d",rbuff[j]); LCD_ShowNum(60+j,190,rbuff[j],3,16); } } } [/mw_shl_code]

[mw_shl_code=c,true]#include "dma.h" DMA_InitTypeDef DMA_Initialize; u16 DMA_MEM_LEN; //配置DMA1串口1接收 void DMA_Config(DMA_Channel_TypeDef* DMA_CHx,u32 dpba,u32 dmba,u32 buffsize ) { RCC_AHBPeriphClockCmd (RCC_AHBPeriph_DMA1 ,ENABLE); DMA_DeInit(DMA_CHx); DMA_MEM_LEN = buffsize; DMA_Initialize.DMA_PeripheralBaseAddr = dpba; //外设地址 DMA_Initialize.DMA_MemoryBaseAddr = dmba; //内存地址 DMA_Initialize.DMA_DIR = DMA_DIR_PeripheralSRC;//外设作为数据的来源 DMA_Initialize.DMA_BufferSize = buffsize; //一次传输的数据量 DMA_Initialize.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//外设地址不增加 DMA_Initialize.DMA_MemoryInc = DMA_PeripheralInc_Enable;//内存地址增加 DMA_Initialize.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; DMA_Initialize.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; DMA_Initialize.DMA_Mode = DMA_Mode_Normal; DMA_Initialize.DMA_Priority = DMA_Priority_VeryHigh; DMA_Initialize.DMA_M2M = DMA_M2M_Disable; DMA_Init(DMA_CHx,&DMA_Initialize); //DMA_Cmd(DMA_CHx,ENABLE); //使能DMAx通道x,启动传输 } void Open_DAM(DMA_Channel_TypeDef* DMA_CHx,u32 buffsize) { DMA_Cmd(DMA_CHx,DISABLE); DMA_SetCurrDataCounter(DMA1_Channel5,DMA_MEM_LEN); DMA_Cmd(DMA_CHx,ENABLE); } [/mw_shl_code]