Reading ADC Multichannel from sensor

[motorhead_i_t]

Posted on February 13, 2013 at 18:48

 i am having trouble writing code on

STM32f103 , I want to get value from accelerometer and send to UARTvoid RCC_setup(void){ ErrorStatus HSEStartUpStatus; RCC_DeInit(); RCC_HSEConfig(RCC_HSE_ON); HSEStartUpStatus = RCC_WaitForHSEStartUp(); if (HSEStartUpStatus == SUCCESS) { RCC_PCLK1Config(RCC_HCLK_Div2); RCC_PCLK2Config(RCC_HCLK_Div1); RCC_HCLKConfig(RCC_SYSCLK_Div1);  RCC_ADCCLKConfig(RCC_PCLK2_Div4);  RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9); FLASH_SetLatency(FLASH_Latency_2); FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable); RCC_PLLCmd(ENABLE); while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET); RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK); while(RCC_GetSYSCLKSource() != 0x08); }}void GPIO_USART1_setup(){ GPIO_InitTypeDef GPIO_InitStructure ; //Enable GPIOA and AFIO clock RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO,ENABLE); //Configure USART_Tx (PA9) as alternate function push-pull GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz ; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP ; GPIO_Init(GPIOA, &GPIO_InitStructure); //Configure USART1_Rx (PA10) as input floating GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10 ; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOA , &GPIO_InitStructure);

}

void GPIO_ADC1_setup(){   GPIO_InitTypeDef GPIO_InitStructure;   // Enable GPIOC clock   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);   // Configure PA1 as analog input(ADC Channel)    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2;   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;   GPIO_Init(GPIOA, &GPIO_InitStructure);}void DMA_Config(void){   __IO uint32_t ADC1ConvertedValue[2]; /* Initialize the DMA1 Channel1 according to the DMA_InitStructure members */ DMA_InitTypeDef DMA_InitStructure;        RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1,ENABLE);   DMA_DeInit(DMA1_Channel1); DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1->DR; DMA_InitStructure.DMA_MemoryBaseAddr =(uint32_t)&ADC1ConvertedValue[2]; DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; DMA_InitStructure.DMA_BufferSize = 3; DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; 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_setup(){   ADC_InitTypeDef ADC_InitStructure;   // Enable ADC1 clock   RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1,ENABLE);   // ADC1 configuration   ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;   ADC_InitStructure.ADC_ScanConvMode = ENABLE;   ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;   ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;   ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;   ADC_InitStructure.ADC_NbrOfChannel = 3;   ADC_Init(ADC1, &ADC_InitStructure);   // ADC1 regular channel1 configuration     ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_13Cycles5); ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2, ADC_SampleTime_13Cycles5); ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 3, ADC_SampleTime_13Cycles5);     ADC_DMACmd(ADC1, ENABLE);                           ADC_Cmd(ADC1, ENABLE);  // Enable ADC1       ADC_ResetCalibration(ADC1);   // Enable ADC1 reset calibaration register    while(ADC_GetResetCalibrationStatus(ADC1));         ADC_StartCalibration(ADC1);   // Start ADC1 calibaration    while(ADC_GetCalibrationStatus(ADC1)); // Check the end of ADC1 calibration  ADC_SoftwareStartConvCmd(ADC1, ENABLE); }int main (void) {  __IO uint32_t ADC1ConvertedValue[2];  int16_t i;          uint16_t Valuel[2];    RCC_setup();          GPIO_USART1_setup();          USART1_setup();          DMA_Config();  ADC_setup();while(1) {                 ADC_SoftwareStartConvCmd(ADC1, ENABLE);  for(i=0;i<3;i++) { Value[i] = ADC1ConvertedValue[i];  USART_GetFlagStatus(USART1,USART_FLAG_TXE)==RESET ; USART_SendData(USART1,Value[i]);                          }}Result:  value not change ,not read 

please give me some guidelines ,Thank You .

[Tesla DeLorean]

Posted on February 13, 2013 at 19:23

Good grief, where to start.

Use a newer version of the STM32F1 library (3.5.0 ?), the clocks and PLL are set up in SystemInit(), called prior to main() in the CMSIS model. You DMA to a local array in a subroutine, that becomes a random stack location once it exits, use a global. The array is too small for the data sample length. Need foo[3] The beginning of the array is &foo[0] not &foo[2]!! You don't setup the USART. USART_GetFlagStatus(USART1,USART_FLAG_TXE)==RESET ; // WTF? USART_SendData() sends 8-bit binary data, not ASCII decoding, not 12/16-bit words.