STM32F407 ADC LOWER LEVEL PROGRAMMING ISSUE

[Yadav]

Posted on June 12, 2018 at 06:37

Hi Everyone,

       I m interested in doing lower level programming. Now i currently working with stm32f407 board. I have successfully got the output for GPIO. Now i am started working on ADC interface. But i couldnt get the output for my code. I haD given 3V to PA1 pin but still i couldnt get the proportional value in DR register. Kindly help me out to solve this issue.

&sharpinclude 'stm32f4xx.h'

void GPIO_Init(void);

void adc_init(void);

uint16_t adc_read();

uint16_t adc_value1=0,adc_value2=0;

int main(void)

{ GPIO_Init(); adc_init();

while (1)

{ adc_value2=adc_read(); if(adc_value2>=0X000C) { GPIOD->ODR|=(1<<14); } else { GPIOD->ODR|=(1<<15); } // // GPIOD->ODR&=~(1<<14);// for(delay=0;delay<=4166666;delay++);

// GPIOD->ODR|=(1<<15);

// for(delay=0;delay<=4166666;delay++);// // GPIOD->ODR&=~(1<<15);// for(delay=0;delay<=4166666;delay++);

}

}

void GPIO_Init(void)

{

RCC->AHB1ENR |=(1<<1); // clock for gpioA

GPIOA->MODER |= 0X03; // PA1 analog inputs }

void adc_init(void)

{ RCC->APB2ENR|=(1<<8); ADC1->CR1|=(1<<24)|(1<<0); // 1st CHANNEL // 10BIT RESOLUTION ADC1->CR2|=(1<<10);// ADC1->CR2 ADC1->SMPR2 |= 1; //15 cycles ADC1->SQR1 &= ~(1<<20); // 1 conversion ADC1->SQR3 = 0x00; }

uint16_t adc_read()

{ ADC1->CR2|=(1<<0);// ADC ON ADC1->CR2|=(1<<30);// START CONVERSION // if((ADC1->SR&(1<<1))) // wait untill EOC bit clear //{ ADC1->SR = 0X00; adc_value1=ADC1->DR; //} ADC1->CR2&=~(1<<0);// ADC OFF return(adc_value1);}#stm32f407-discovery-startup #learning-stm32 #stm32-l4

[Yadav]

Posted on June 14, 2018 at 03:53

Now i am getting random values but not correct values.

Is there no one to help me out to solve this issue ??

#include 'stm32f4xx.h'

void GPIO_Init(void);

void adc_init(void);

uint16_t adc_read();

uint16_t adc_value1=0,adc_value2=0;

int main(void)

{ GPIO_Init(); adc_init();

while (1)

{ adc_value2=adc_read(); if(adc_value2>=500) { GPIOD->ODR|=(1<<14); } else { GPIOD->ODR|=(1<<15); } // // GPIOD->ODR&=~(1<<14);// for(delay=0;delay<=4166666;delay++);

// GPIOD->ODR|=(1<<15);

// for(delay=0;delay<=4166666;delay++);// // GPIOD->ODR&=~(1<<15);// for(delay=0;delay<=4166666;delay++);

}

}

void GPIO_Init(void)

{ RCC->AHB1ENR|=RCC_AHB1ENR_GPIODEN; GPIOD->MODER|=(1<<28); // pin 14 is output GPIOD->OTYPER&=~(1<<14);//pin 14 as push pull GPIOD->OSPEEDR|=(1<<29)|(1<<28);//LOW speed GPIOD->PUPDR&=~(1<<29)|(1<<28);//No push pull GPIOD->MODER|=(1<<30); // pin 14 is output GPIOD->OTYPER&=~(1<<15);//pin 14 as push pull GPIOD->OSPEEDR|=(1<<30)|(1<<31);//LOW speed GPIOD->PUPDR&=~(1<<30)|(1<<31);//No push pull

RCC->AHB1ENR |=(1<<0); // clock for gpioA

GPIOA->MODER |= (1<<3)|(1<<2); // Analog mode GPIOA->PUPDR&=~(0X00000000);//No push pull // GPIOA->AFR[0]|=(1<<0)|(1<<1)|(1<<2); // ADC FUNCTION FOR PA1 GPIOA->OTYPER&=~(1<<1);//pin 1 as push pull GPIOA->OSPEEDR|=(1<<3);//HIGH speed }

void adc_init(void)

{ RCC->APB2ENR|=(1<<8); ADC1->CR1|=(1<<0)|(1<<23); // 1st CHANNEL // WATCHDOG ENABLE ADC1->CR1&=~(1<<24);// ADC1->CR1|=(1<<24); //10BIT RESOLUTION ADC1->CR2|=(1<<10);// EOCs is set ADC1->SMPR2 |= (1<<3); //15 cycles ADC1->SQR1 &= ~(1<<20); // 1 conversion ADC1->SQR3 = 0x00; }

uint16_t adc_read()

{ ADC1->CR2|=(1<<0);// ADC ON ADC1->CR2|=(1<<30);// START CONVERSION while(ADC1->SR&(1<<1)) // wait untill EOC bit set { ADC1->SR = 0X00; adc_value1=ADC1->DR; ADC1->CR2&=~(1<<0);// ADC OFF ADC1->CR2&=~(1<<30);// STOP CONVERSION } return(adc_value1);}

[Tesla DeLorean]

Posted on June 14, 2018 at 06:00

>>Is there no one to help me out to solve this issue ??

If you want someone to sit with you and work through your issues, hire a tutor.

Want to learn by inspection, implement with library code, replicate the low level functionality. If your code doesn't work, look at how the registers differ, cross-reference with the documentation, refine the model in your head.

[Yadav]

Posted on June 14, 2018 at 06:45

I have tried with library file and got output already. Since i am new to the STM32 controllers, so only i couldn't make it out. I didn't post this question here without trying anything. I have been struggling with this issue for almost 1 week. Then only i posted this question here. I never asked someone to sit with me and solve it. It is a forum and i am trying get positive solution from senior developers.

I am expertise in AVR controller. If somebody posted question like this, i would have given the good positive response instead of ur answer.

Thank you

[stm322399]

Posted on June 14, 2018 at 11:54

SQR3 tells that conversion is done on ADC123_IN0, but PA1 is ADC123_IN1

[henry.dick · Accepted solution]

Posted on June 14, 2018 at 12:11

'

Kindly help me out to solve this issue.'

1. go through the datasheet and see what needs to be done; 

2. go through the library code and see how they did it.

3. or take a look at sample code. one example is here: 

https://github.com/dannyf00/My-MCU-Libraries---2nd-try/tree/master/STM32F0

  different devices but similar peripherals.

[Yadav]

Posted on June 14, 2018 at 15:37

Thank u . I got output. 

[Yadav]

Posted on June 14, 2018 at 15:38

Thank u so much. I followed your link and tried same thing in controller. Now i got the output. !!!!

[Yadav]

Posted on June 16, 2018 at 13:52

Hi.. Now I am working on STM32F4Doscovery board timers. I want to make a timer interrupt for an application. It can be 1sec or 500ms interrupt. I have read the datasheet and written the program accordingly. But i dont know how to use interrupt in STM32. I have tried something, but nothing is happening. Can someone suggest me a solution??

#include 'stm32f4xx.h'

// Component selection

void GPIO_Init(void);

void tim10_init(void);

int main(void)

{GPIO_Init();tim10_init();while (1){

GPIOD->ODR|=(1<<15);

}

}

void GPIO_Init(void)

{RCC->AHB1ENR|=RCC_AHB1ENR_GPIODEN;

GPIOD->MODER|=(1<<28); // pin 14 is output

GPIOD->OTYPER&=~(1<<14);//pin 14 as push pullGPIOD->OSPEEDR|=(1<<29)|(1<<28);//LOW speedGPIOD->PUPDR&=~(1<<29)|(1<<28);//No push pull

GPIOD->MODER|=(1<<30); // pin 15 is output

GPIOD->OTYPER&=~(1<<15);//pin 15 as push pullGPIOD->OSPEEDR|=(1<<30)|(1<<31);//LOW speedGPIOD->PUPDR&=~(1<<30)|(1<<31);//No push pull}

void tim10_init(void)

{RCC->APB2ENR|=(1<<17);TIM10->CR1|=(1<<7);TIM10->DIER|=(1<<1);TIM10->SR|=(1<<1);TIM10->EGR|=(1<<1);TIM10->CCMR1|=(1<<3)|(0<<1)|(0<<0);TIM10->CCER|=(1<<0);//TIM10->CCR1=5;TIM10->PSC|=4200;TIM10->ARR|=1000;NVIC_EnableIRQ(TIM1_UP_TIM10_IRQn);}void TIM10_IRQHandler(void){GPIOD->ODR|=(1<<14);

}

[waclawek.jan]

Posted on June 16, 2018 at 14:13

https://community.st.com/0D50X00009XkWGnSAN