Changing ADC1's channel input PIN from PA0 to PA1 and configuring ADC2.

HPras.1 · ‎2020-02-12

I am using STM32F429 DISCO board and X-CUBE DSPDEMO to perform FFT on an analog signal. The demo code comes with ADC1 IN0 configured for PA0. It performs FFT and displays the signal on LCD. I am trying to change the input pin to PA1 by changing definitions in the global.h file, but it doesnt work when i connect the input signal to PA1. The code could be found here. https://www.st.com/en/embedded-software/x-cube-dspdemo.html#overview.

Kindly help.

Ozone · ‎2020-02-12

Presenting some code would have been helpful.

But in general, specific ADC channels are bound to specific pins. You need to change both GPIO pin and ADC channel number.

HPras.1 · ‎2020-02-12

Hi,

The Default code is

/* User can use this section to tailor ADCx instance used and associated 
   resources */
/* Definition for ADCx clock resources */
#define ADCx                            ADC1
#define ADCx_CLK_ENABLE()               __HAL_RCC_ADC1_CLK_ENABLE()
#define DMA2_CLK_ENABLE()               __HAL_RCC_DMA2_CLK_ENABLE()     
#define ADCx_CHANNEL_GPIO_CLK_ENABLE()  __HAL_RCC_GPIOA_CLK_ENABLE()
     
#define ADCx_FORCE_RESET()              __HAL_RCC_ADC_FORCE_RESET()
#define ADCx_RELEASE_RESET()            __HAL_RCC_ADC_RELEASE_RESET()
 
/* Definition for ADCx Channel Pin */
#define ADCx_CHANNEL_PIN                GPIO_PIN_0
#define ADCx_CHANNEL_GPIO_PORT          GPIOA
 
/* Definition for ADCx's Channel */
#define ADCx_CHANNEL                    ADC_CHANNEL_0
 
/* Definition for ADCx's DMA */
#define ADCx_DMA_CHANNEL                DMA_CHANNEL_0
#define ADCx_DMA_STREAM                 DMA2_Stream0

and i changed it to

/* User can use this section to tailor ADCx instance used and associated 
   resources */
/* Definition for ADCx clock resources */
#define ADCx                            ADC1
#define ADCx_CLK_ENABLE()               __HAL_RCC_ADC1_CLK_ENABLE()
#define DMA2_CLK_ENABLE()               __HAL_RCC_DMA2_CLK_ENABLE()     
#define ADCx_CHANNEL_GPIO_CLK_ENABLE()  __HAL_RCC_GPIOA_CLK_ENABLE()
     
#define ADCx_FORCE_RESET()              __HAL_RCC_ADC_FORCE_RESET()
#define ADCx_RELEASE_RESET()            __HAL_RCC_ADC_RELEASE_RESET()
 
/* Definition for ADCx Channel Pin */
#define ADCx_CHANNEL_PIN                GPIO_PIN_1
#define ADCx_CHANNEL_GPIO_PORT          GPIOA
 
/* Definition for ADCx's Channel */
#define ADCx_CHANNEL                    ADC_CHANNEL_1
 
/* Definition for ADCx's DMA */
#define ADCx_DMA_CHANNEL                DMA_CHANNEL_0
#define ADCx_DMA_STREAM                 DMA2_Stream0

Ozone · ‎2020-02-13

I don't speak Cube.

Did you walk through the code, and check you catched every occurence ?