ADC Port Issues

[cozzensbp]

Posted on March 30, 2013 at 23:59

So I am having an interesting issue with configuring the ADC to work with anything but PortA.  I can hook it to any pin on port A, change the ADC channel, and it will work.  However, I have tried doing the same on PortB and PortC, but it doesn't seem to work.  I enable the PortB/C clock, configure the pins on those ports appropriately, but still nothing.  Here is my configuration code:

void ADC_Configuration(void){  ADC_InitTypeDef ADC_InitStructure;  DMA_InitTypeDef DMA_InitStructure;  GPIO_InitTypeDef GPIO_InitStructure;  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);  RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_GPIA | RCC_APB2Periph_AFIO, ENABLE);  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;  GPIO_Init(GPIOA, &GPIO_InitStructure);   /* DMA channel1 configuration ----------------------------------------------*/  DMA_DeInit(DMA1_Channel1);  DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;  DMA_InitStructure.DMA_MemoryBaseAddr = (u32)&ADC_ConvertedValue;  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);      /* 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 = 1;  ADC_Init(ADC1, &ADC_InitStructure);  /* ADC1 regular channel6 configuration */   ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 1, ADC_SampleTime_55Cycles5);  /* Enable ADC1 DMA */  ADC_DMACmd(ADC1, ENABLE);    /* Enable ADC1 */  ADC_Cmd(ADC1, ENABLE);  /* Enable ADC1 reset calibaration register */     ADC_ResetCalibration(ADC1);  /* Check the end of ADC1 reset calibration register */  while(ADC_GetResetCalibrationStatus(ADC1));  /* Start ADC1 calibaration */  ADC_StartCalibration(ADC1);  /* Check the end of ADC1 calibration */  while(ADC_GetCalibrationStatus(ADC1));       /* Start ADC1 Software Conversion */   ADC_SoftwareStartConvCmd(ADC1, ENABLE);} #gpio #dma #stm32f2 #adc

[lux]

Posted on October 07, 2014 at 21:26

Hi Clive1, 

Thank-you so much for your response. I used that information in the code to setup the GPIO pins, ADC, and DMA. But it doesn't work for some strange reason. I have asked the question on a [DEAD LINK /public/STe2ecommunities/mcu/Lists/STM32Discovery/Flat.aspx?RootFolder=/public/STe2ecommunities/mcu/Lists/STM32Discovery/Configuring%20ADC%20on%20certain%20pins%20from%20STM32F207ZG%20Board&FolderCTID=0x01200200770978C69A1141439FE559EB459D75800084C20D8867EAD444A5987D47BE638E0F&TopicsView=https://my.st.com/public/STe2ecommunities/mcu/Lists/STM32Discovery/AllItems.aspx&currentviews=0]separate form now, since it is a bit off topic from the original post. If you can take a look at it that will be greatly appreciated. Kind Regards, - Lux