ADC单通道转换+DMA, 一直卡在判断传输完成的循环里

Hanson · 发表于 2015-8-23 15:49:56

代码如下，我写的是ADC1规则通道1单次转换后，DMA传输至内存temp, 然后串口1输出
ADC和串口部分单独测试过OK, 问题出在DMA部分，卡在while (DMA_GetFlagStatus(DMA1_FLAG_TC1)!=SET)跳不出来...
（我刚学STM32两周，51单片机也没怎么学过，求各位指导啊）

[mw_shl_code=c,true]#include "usart.h" #include "delay.h" #include "stm32f10x_dma.h" #include "stm32f10x_adc.h" u16 temp; void ADC_UD_Init(void) { GPIO_InitTypeDef GPIO_InitStructure; ADC_InitTypeDef ADC_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_ADC1, ENABLE); RCC_ADCCLKConfig(RCC_PCLK2_Div6); GPIO_InitStructure.GPIO_Pin=GPIO_Pin_1; GPIO_InitStructure.GPIO_Mode=GPIO_Mode_AIN; GPIO_Init(GPIOA,&GPIO_InitStructure); ADC_DeInit(ADC1); ADC_InitStructure.ADC_Mode=ADC_Mode_Independent; ADC_InitStructure.ADC_ScanConvMode=DISABLE; ADC_InitStructure.ADC_ContinuousConvMode=DISABLE; ADC_InitStructure.ADC_ExternalTrigConv=ADC_ExternalTrigConv_None; ADC_InitStructure.ADC_DataAlign=ADC_DataAlign_Right; ADC_InitStructure.ADC_NbrOfChannel=1; ADC_Init(ADC1,&ADC_InitStructure); ADC_DMACmd(ADC1,ENABLE); ADC_Cmd(ADC1, ENABLE); ADC_ResetCalibration(ADC1); while (ADC_GetResetCalibrationStatus(ADC1)); ADC_StartCalibration(ADC1); while (ADC_GetCalibrationStatus(ADC1)); ADC_RegularChannelConfig(ADC1,1,1,ADC_SampleTime_239Cycles5); } void DMA_UD_Init(void) { DMA_InitTypeDef DMA_InitStructure; RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); DMA_DeInit(DMA1_Channel1); DMA_InitStructure.DMA_PeripheralBaseAddr=ADC1->DR; DMA_InitStructure.DMA_MemoryBaseAddr=temp; DMA_InitStructure.DMA_DIR=DMA_DIR_PeripheralSRC; DMA_InitStructure.DMA_BufferSize=16; DMA_InitStructure.DMA_PeripheralInc=DMA_PeripheralInc_Disable; DMA_InitStructure.DMA_MemoryInc=DMA_MemoryInc_Disable; DMA_InitStructure.DMA_PeripheralDataSize=DMA_PeripheralDataSize_HalfWord; DMA_InitStructure.DMA_MemoryDataSize=DMA_MemoryDataSize_HalfWord; DMA_InitStructure.DMA_Mode=DMA_Mode_Normal; DMA_InitStructure.DMA_Priority=DMA_Priority_Medium; DMA_InitStructure.DMA_M2M=DMA_M2M_Disable; DMA_Init(DMA1_Channel1,&DMA_InitStructure); DMA_Cmd(DMA1_Channel1, ENABLE); } void Get_ADC(void) { ADC_SoftwareStartConvCmd(ADC1, ENABLE); while (ADC_GetFlagStatus(ADC1,ADC_FLAG_EOC)!=1); } void ADC_To_DMA() { DMA_Cmd(DMA1_Channel1, DISABLE ); DMA_SetCurrDataCounter(DMA1_Channel1,16); DMA_Cmd(DMA1_Channel1, ENABLE); while (DMA_GetFlagStatus(DMA1_FLAG_TC1)!=SET); DMA_ClearFlag(DMA1_FLAG_TC1); } int main(void) { u8 n=1; float adcx; delay_init(); DMA_UD_Init(); ADC_UD_Init(); USART_UD_Init(); while (n<=100) { printf("本次转换结果为:"); Get_ADC(); ADC_To_DMA(); adcx=temp*(3.3/4096); printf("%.3f\r\n",adcx); while(USART_GetFlagStatus(USART1,USART_FLAG_TC)!=SET); n++; delay_ms(34464); delay_ms(34464); delay_ms(34464); } } [/mw_shl_code]

求助~~