Struggle with the ADC configuration of an stm32L476RG












0















I work on a project and I wanted to use ADC conversion (I work on an stm32L476), but I'm struggling with my code. My goal was to put a potentiometer between the ground and my 3.3 pin and see the result on PA1 with Putty. Here is the code of my ADC initialisation :



void BSP_Threshold_Init(){
//Enable GPIOA clock
RCC->AHB2ENR |= RCC_AHB2ENR_GPIOAEN;

//Configure PA1 as input
GPIOA->MODER &= ~GPIO_MODER_MODE1_Msk;
GPIOA->MODER |= (0x00 <<GPIO_MODER_MODE1_Pos);

// Enable ADC clock
RCC->APB2ENR |= RCC_AHB2ENR_ADCEN;

// Reset ADC configuration
ADC1->CR = 0x00000000;
ADC1->CFGR = 0x00000000;
ADC1->CFGR2 = 0x00000000;
ADC1->SQR1 = 0x00000000;
ADC123_COMMON->CCR = 0x00000000;

// Enable continuous conversion mode
ADC1->CFGR |= ADC_CFGR_CONT;

// 12-bit resolution
ADC1->CFGR |= (0x00 <<ADC_CFGR_RES_Pos);

// Set sampling time to 24.5 ADC clock cycles
ADC1->SMPR1 |= (0x03 << 0U);

// Choose the number of conversion (here 1)
ADC1->SQR1 |= (0x00 << 0U);

//Choose the channel of the first conversion
ADC1->SQR1 |= (0x01 << 6U);

//// Select HCLK/1 as ADC clock
ADC123_COMMON->CCR |= (0x01 <<ADC_CCR_CKMODE_Pos);

// Enable ADC
ADC1->CR |= ADC_CR_ADEN;

// Start conversion
ADC1->CR |= ADC_CR_ADSTART;

}


Then in my main, I want to print the value of my ADC on Putty (I worked with Putty several times, so I don't think there is a problem here).



Here is the portion of code in my main :



while(1)
{

// Wait here until ADC EOC
while ((ADC1->ISR & ADC_ISR_EOC) != ADC_ISR_EOC);

// Report result to console
my_printf("ADC value = %xrn", ADC1->DR);

// Wait about 200ms
for (i=0; i<500000; i++);

}


I printed other things in the init phase with my_printf, but when comes the time to do the loop, nothing appears. Do you have any clues of what I could do wrong ? I don't know if my problem comes from my ADC configuration, or if it comes from my clock configuration or the way I wait for the ADC conversion in my main.



Thanks in advance.










share|improve this question


















  • 1





    Hi, please debug your program first so you will see if the ADC is producing any useful output. Then you will have much more informations about where your problem might be.

    – A.R.C.
    Nov 22 '18 at 14:20
















0















I work on a project and I wanted to use ADC conversion (I work on an stm32L476), but I'm struggling with my code. My goal was to put a potentiometer between the ground and my 3.3 pin and see the result on PA1 with Putty. Here is the code of my ADC initialisation :



void BSP_Threshold_Init(){
//Enable GPIOA clock
RCC->AHB2ENR |= RCC_AHB2ENR_GPIOAEN;

//Configure PA1 as input
GPIOA->MODER &= ~GPIO_MODER_MODE1_Msk;
GPIOA->MODER |= (0x00 <<GPIO_MODER_MODE1_Pos);

// Enable ADC clock
RCC->APB2ENR |= RCC_AHB2ENR_ADCEN;

// Reset ADC configuration
ADC1->CR = 0x00000000;
ADC1->CFGR = 0x00000000;
ADC1->CFGR2 = 0x00000000;
ADC1->SQR1 = 0x00000000;
ADC123_COMMON->CCR = 0x00000000;

// Enable continuous conversion mode
ADC1->CFGR |= ADC_CFGR_CONT;

// 12-bit resolution
ADC1->CFGR |= (0x00 <<ADC_CFGR_RES_Pos);

// Set sampling time to 24.5 ADC clock cycles
ADC1->SMPR1 |= (0x03 << 0U);

// Choose the number of conversion (here 1)
ADC1->SQR1 |= (0x00 << 0U);

//Choose the channel of the first conversion
ADC1->SQR1 |= (0x01 << 6U);

//// Select HCLK/1 as ADC clock
ADC123_COMMON->CCR |= (0x01 <<ADC_CCR_CKMODE_Pos);

// Enable ADC
ADC1->CR |= ADC_CR_ADEN;

// Start conversion
ADC1->CR |= ADC_CR_ADSTART;

}


Then in my main, I want to print the value of my ADC on Putty (I worked with Putty several times, so I don't think there is a problem here).



Here is the portion of code in my main :



while(1)
{

// Wait here until ADC EOC
while ((ADC1->ISR & ADC_ISR_EOC) != ADC_ISR_EOC);

// Report result to console
my_printf("ADC value = %xrn", ADC1->DR);

// Wait about 200ms
for (i=0; i<500000; i++);

}


I printed other things in the init phase with my_printf, but when comes the time to do the loop, nothing appears. Do you have any clues of what I could do wrong ? I don't know if my problem comes from my ADC configuration, or if it comes from my clock configuration or the way I wait for the ADC conversion in my main.



Thanks in advance.










share|improve this question


















  • 1





    Hi, please debug your program first so you will see if the ADC is producing any useful output. Then you will have much more informations about where your problem might be.

    – A.R.C.
    Nov 22 '18 at 14:20














0












0








0








I work on a project and I wanted to use ADC conversion (I work on an stm32L476), but I'm struggling with my code. My goal was to put a potentiometer between the ground and my 3.3 pin and see the result on PA1 with Putty. Here is the code of my ADC initialisation :



void BSP_Threshold_Init(){
//Enable GPIOA clock
RCC->AHB2ENR |= RCC_AHB2ENR_GPIOAEN;

//Configure PA1 as input
GPIOA->MODER &= ~GPIO_MODER_MODE1_Msk;
GPIOA->MODER |= (0x00 <<GPIO_MODER_MODE1_Pos);

// Enable ADC clock
RCC->APB2ENR |= RCC_AHB2ENR_ADCEN;

// Reset ADC configuration
ADC1->CR = 0x00000000;
ADC1->CFGR = 0x00000000;
ADC1->CFGR2 = 0x00000000;
ADC1->SQR1 = 0x00000000;
ADC123_COMMON->CCR = 0x00000000;

// Enable continuous conversion mode
ADC1->CFGR |= ADC_CFGR_CONT;

// 12-bit resolution
ADC1->CFGR |= (0x00 <<ADC_CFGR_RES_Pos);

// Set sampling time to 24.5 ADC clock cycles
ADC1->SMPR1 |= (0x03 << 0U);

// Choose the number of conversion (here 1)
ADC1->SQR1 |= (0x00 << 0U);

//Choose the channel of the first conversion
ADC1->SQR1 |= (0x01 << 6U);

//// Select HCLK/1 as ADC clock
ADC123_COMMON->CCR |= (0x01 <<ADC_CCR_CKMODE_Pos);

// Enable ADC
ADC1->CR |= ADC_CR_ADEN;

// Start conversion
ADC1->CR |= ADC_CR_ADSTART;

}


Then in my main, I want to print the value of my ADC on Putty (I worked with Putty several times, so I don't think there is a problem here).



Here is the portion of code in my main :



while(1)
{

// Wait here until ADC EOC
while ((ADC1->ISR & ADC_ISR_EOC) != ADC_ISR_EOC);

// Report result to console
my_printf("ADC value = %xrn", ADC1->DR);

// Wait about 200ms
for (i=0; i<500000; i++);

}


I printed other things in the init phase with my_printf, but when comes the time to do the loop, nothing appears. Do you have any clues of what I could do wrong ? I don't know if my problem comes from my ADC configuration, or if it comes from my clock configuration or the way I wait for the ADC conversion in my main.



Thanks in advance.










share|improve this question














I work on a project and I wanted to use ADC conversion (I work on an stm32L476), but I'm struggling with my code. My goal was to put a potentiometer between the ground and my 3.3 pin and see the result on PA1 with Putty. Here is the code of my ADC initialisation :



void BSP_Threshold_Init(){
//Enable GPIOA clock
RCC->AHB2ENR |= RCC_AHB2ENR_GPIOAEN;

//Configure PA1 as input
GPIOA->MODER &= ~GPIO_MODER_MODE1_Msk;
GPIOA->MODER |= (0x00 <<GPIO_MODER_MODE1_Pos);

// Enable ADC clock
RCC->APB2ENR |= RCC_AHB2ENR_ADCEN;

// Reset ADC configuration
ADC1->CR = 0x00000000;
ADC1->CFGR = 0x00000000;
ADC1->CFGR2 = 0x00000000;
ADC1->SQR1 = 0x00000000;
ADC123_COMMON->CCR = 0x00000000;

// Enable continuous conversion mode
ADC1->CFGR |= ADC_CFGR_CONT;

// 12-bit resolution
ADC1->CFGR |= (0x00 <<ADC_CFGR_RES_Pos);

// Set sampling time to 24.5 ADC clock cycles
ADC1->SMPR1 |= (0x03 << 0U);

// Choose the number of conversion (here 1)
ADC1->SQR1 |= (0x00 << 0U);

//Choose the channel of the first conversion
ADC1->SQR1 |= (0x01 << 6U);

//// Select HCLK/1 as ADC clock
ADC123_COMMON->CCR |= (0x01 <<ADC_CCR_CKMODE_Pos);

// Enable ADC
ADC1->CR |= ADC_CR_ADEN;

// Start conversion
ADC1->CR |= ADC_CR_ADSTART;

}


Then in my main, I want to print the value of my ADC on Putty (I worked with Putty several times, so I don't think there is a problem here).



Here is the portion of code in my main :



while(1)
{

// Wait here until ADC EOC
while ((ADC1->ISR & ADC_ISR_EOC) != ADC_ISR_EOC);

// Report result to console
my_printf("ADC value = %xrn", ADC1->DR);

// Wait about 200ms
for (i=0; i<500000; i++);

}


I printed other things in the init phase with my_printf, but when comes the time to do the loop, nothing appears. Do you have any clues of what I could do wrong ? I don't know if my problem comes from my ADC configuration, or if it comes from my clock configuration or the way I wait for the ADC conversion in my main.



Thanks in advance.







stm32






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asked Nov 22 '18 at 7:54









HixHix

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134








  • 1





    Hi, please debug your program first so you will see if the ADC is producing any useful output. Then you will have much more informations about where your problem might be.

    – A.R.C.
    Nov 22 '18 at 14:20














  • 1





    Hi, please debug your program first so you will see if the ADC is producing any useful output. Then you will have much more informations about where your problem might be.

    – A.R.C.
    Nov 22 '18 at 14:20








1




1





Hi, please debug your program first so you will see if the ADC is producing any useful output. Then you will have much more informations about where your problem might be.

– A.R.C.
Nov 22 '18 at 14:20





Hi, please debug your program first so you will see if the ADC is producing any useful output. Then you will have much more informations about where your problem might be.

– A.R.C.
Nov 22 '18 at 14:20












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