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Struggle with the ADC configuration of an stm32L476RG
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
asked Nov 22 '18 at 7:54
HixHix
134
add a comment |
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
asked Nov 22 '18 at 7:54
HixHix
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
add a comment |
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
asked Nov 22 '18 at 7:54
HixHix
134
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
stm32
asked Nov 22 '18 at 7:54
HixHix
134
asked Nov 22 '18 at 7:54
HixHix
134
asked Nov 22 '18 at 7:54
HixHix
134
asked Nov 22 '18 at 7:54
HixHix
134
asked Nov 22 '18 at 7:54
HixHix
134
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
add a comment |
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
add a comment |
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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