DMA串口发送多路AD

Saxon

[mw_shl_code=c,true] #define N 10 //?????¨??????50?? #define M 3 //????AD?¨??3?? u16 AD_Value[N][M]; u16 After_filter[M]; int i; void adcinit1(void) { ADC_InitTypeDef ADC_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA |RCC_APB2Periph_ADC1 , ENABLE ); //????ADC1?¨???±?? RCC_ADCCLKConfig(RCC_PCLK2_Div6); //72M/6=12,ADC×??ó?±??????????14M //PA0/1/2/3 ×÷???????¨?????????? GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; //???????????? GPIO_Init(GPIOA, &GPIO_InitStructure); ADC_DeInit(ADC1); //?????è ADC1 ???????????÷???è???±???? ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; //ADC?¤×÷????:ADC1??ADC2?¤×÷?????????? ADC_InitStructure.ADC_ScanConvMode = ENABLE; //????×????¤×÷?????¨?????? ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; //????×????¤×÷??????×??????? ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; //×??????í??????????????·????? ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; //ADC?????????? ADC_InitStructure.ADC_NbrOfChannel = M; //???ò???????ò×?????ADC?¨???????? ADC_Init(ADC1, &ADC_InitStructure); //?ù??ADC_InitStruct?????¨???????????????èADCx???????÷ ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_239Cycles5 ); ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 2, ADC_SampleTime_239Cycles5 ); ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 3, ADC_SampleTime_239Cycles5 ); ADC_DMACmd(ADC1, ENABLE); ADC_Cmd(ADC1, ENABLE); //???????¨??ADC1 ADC_ResetCalibration(ADC1); //???????¨??ADC1????×??????÷ while(ADC_GetResetCalibrationStatus(ADC1)); //????ADC1??????×??????÷??×???,?è??×????ò???? ADC_StartCalibration(ADC1); //???????¨ADC1????×?×??? while(ADC_GetCalibrationStatus(ADC1)); } //DAM void MYDMA_Config(void) { DMA_InitTypeDef DMA_InitStructure; RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); //????DMA???? DMA_DeInit(DMA1_Channel1); //??DMA???¨??1?????÷???è???±???? DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)&ADC1->DR; //DMA???èADC?ù???· DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&AD_Value; //DMA?????ù???· DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; //???è×÷?????????????????? DMA_InitStructure.DMA_BufferSize = N*M; //DMA?¨????DMA???????ó?? DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //???è???·?????÷??±? DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //???????·?????÷???? DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //?????í????8?? DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_HalfWord; //?????í????8?? DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //?¤×÷?????·???????? DMA_InitStructure.DMA_Priority = DMA_Priority_High; //DMA?¨?? x???????????? DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //DMA?¨??x?????è?????????????????? DMA_Init(DMA1_Channel1, &DMA_InitStructure); //?ù??DMA_InitStruct?????¨????????????DMA???¨??USART1_Tx_DMA_Channel?ù±ê?????????÷ } /*????ADC????×???2???????®????*/ u16 GetVolt(u16 advalue) { return (u16)(advalue * 330 / 4096); } int main(void) { u16 value[M]; SystemInit(); delay_init(72); //???±?????? NVIC_Configuration(); uart_init(9600); // LED_Init(); // KEY_Init(); // LCD_Init(); adcinit1(); MYDMA_Config(); ADC_SoftwareStartConvCmd(ADC1, ENABLE); DMA_Cmd(DMA1_Channel1, ENABLE); while(1) { for( i = 0; i < 2;i++) { while(USART_GetFlagStatus(USART1,USART_FLAG_TXE)==RESET); value= GetVolt(After_filter); printf("%d:%d",value/100,value%100); delay_ms(100); } } } [/mw_shl_code]

求大神帮我看看，为什么我串口发出来的东西是0:0.

正点原子

你的GetVolt，函数输出，是0~330的数值。
而除以100，是0~3.3的值了。
而你用的u16，所以是0~3
当你的电压，低于1V，那么输出就是0了，高于1V才输出1
高于2V才输出2.