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HPras.1
HPras.1
Associate
February 13, 2020
Question

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

  • February 13, 2020
  • 1 reply
  • 1295 views

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.

This topic has been closed for replies.

1 reply

Ozone
Ozone
Principal
February 13, 2020

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
HPras.1Author
Associate
February 13, 2020

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
Ozone
Principal
February 13, 2020

I don't speak Cube.

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

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