Posted on January 01, 2015 at 13:19
Dear All,
Some thing wrong with DMA operation please advice/* Includes ------------------------------------------------------------------*/
#include ''stm32f0xx.h''
#include ''stm32f0xx_usart.h''
#include ''stm32f0xx_adc.h''
#include ''stm32f0xx_dma.h''
char name[27]=''USART2 PA9TX -PA10RX dd- '';
int i,j;
__IO uint16_t ADC1ConvertedValue = 0, ADC1ConvertedVoltage = 0;
__IO uint16_t ADC1ConvertedDMAValue = 0, ADC1ConvertedDMAVoltage = 0;
int dem;
float volt;
char Result[32];
void RCC_Configuration(){
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC, ENABLE); /* GPIOC Periph clock enable */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); /* ADC1 Periph clock enable */
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);
}
void GPIO_Configuration(){/* Configure USART1 GPIO pins: Rx and Tx ----------------------------*/
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_DeInit(GPIOA);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_1);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure ADC GPIO Channel_10 as analog input */
GPIO_DeInit(GPIOC);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 ;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9|GPIO_Pin_8;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
GPIO_Init(GPIOC, &GPIO_InitStructure);
}
void delay(void){
int time;
for(time=0;time<1000000;time++);// tre khoang 1000000 lenh
}
void DMA_Configuration(){
DMA_InitTypeDef DMA_InitStructure;
__IO uint16_t ADCConvertedValue;
/* DMA1 channel1 configuration ----------------------------------------------*/
DMA_DeInit(DMA1_Channel1);
DMA_InitStructure.DMA_PeripheralBaseAddr=0X40012440;//ADC_DR_DATA;
DMA_InitStructure.DMA_MemoryBaseAddr=(uint32_t)&ADC1ConvertedDMAValue;
DMA_InitStructure.DMA_DIR=DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize=1;
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_Circular;
DMA_InitStructure.DMA_Priority=DMA_Priority_High;
DMA_InitStructure.DMA_M2M=DMA_M2M_Disable;
DMA_Init(DMA1_Channel1,&DMA_InitStructure);
/* Enable DMA1 channel1 */
DMA_Cmd(DMA1_Channel1,ENABLE);
}
void ADC_Configuration(void){
ADC_InitTypeDef ADC_InitStructure;
ADC_DeInit(ADC1); /* ADCs DeInit */
ADC_StructInit(&ADC_InitStructure); /* Initialize ADC structure */
ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;/* Configure the ADC1 in continous mode withe a resolutuion equal to 12 bits */
ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;
ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_ScanDirection = ADC_ScanDirection_Upward;
ADC_Init(ADC1, &ADC_InitStructure);
ADC_ChannelConfig(ADC1, ADC_Channel_10 , ADC_SampleTime_239_5Cycles); /* Convert the ADC1 Channel 10 with 5 Cycles as sampling time */
ADC_GetCalibrationFactor(ADC1); /* ADC Calibration */
ADC_DMACmd(ADC1, ENABLE);
ADC_Cmd(ADC1, ENABLE); /* Enable ADCperipheral[PerIdx] */
while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_ADRDY)); /* Wait the ADRDY falg */
ADC_StartOfConversion(ADC1); /* ADC1 regular Software Start Conv */
}
void read_adc(){
while(ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC) == RESET); /* Test EOC flag */
ADC1ConvertedValue =ADC_GetConversionValue(ADC1); /* Get ADC1 converted data */
//ADC1ConvertedVoltage = (ADC1ConvertedValue *3300)/0xFFF; /* Compute the voltage */
}
void USART_Configuration(void){
USART_InitTypeDef USART_InitStructure;
USART_DeInit(USART1);
USART_InitStructure.USART_BaudRate = 9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USART1, &USART_InitStructure);
USART_Cmd(USART1,ENABLE);
}
void truyen(unsigned char uData){
while(USART_GetFlagStatus(USART1, USART_FLAG_TXE)==RESET);
USART_SendData(USART1,uData);
}
void Print(const char *s){
int i,j;
j=strlen(s);
for(i=0;i<j;i++)
{
truyen(s[i]);
}
}
int main(void){
RCC_Configuration();
GPIO_Configuration();
ADC_Configuration();
USART_Configuration();
//DMA_Configuration();
sprintf(&Result[0],'' ADC OUT \r\n'');
Print(Result);
while(1){
read_adc();// doc ADC
//DMA_Configuration();
volt=(float)(ADC1ConvertedDMAValue*3.3)/0x0fff;
sprintf(&Result[0],''\rVolt= %1.3f'' ,volt);
Print(Result);
delay();
}
}
Result is zero