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▷ Arm Cortex-M4 (2): ADC

 

 Arm Cortex-M4 (2): ADC 

  • ✅ practice description:
    • It serves to convert an analog signal (voltage or current-based) into a digital signal, in order to facilitate its processing, as well as to make the resulting (digital) signal more immune to noise and other interferences to which analog signals are more sensitive. The GPIO LED practice using the NUCLEO-F446RE model aims to configure the microcontroller STM32F446RE's port pins as outputs on the used board. The STM32F446RE is an advanced microcontroller based on the Arm® Cortex®-M4 core, operating at a frequency of 180 MHz, enabling it to carry out data processing tasks quickly and efficiently. For the practice, PORTA pins will be connected.
    • The practice of analog to digital conversion (ADC) using the NUCLEO-F446RE development board in conjunction with the STM32CubeIDE integrated development environment (IDE) aims primarily to transform an analog signal, whether in the form of voltage or current, into a digital representation. This conversion is essential to facilitate signal processing while providing greater immunity to noise and interference, which typically affect analog signals more prominently.
    • This microcontroller is high-end and based on the Arm® Cortex®-M4 architecture, operating at a notable frequency of 180 MHz. Thanks to this power, it is capable of efficiently and swiftly performing data processing operations.
    • To carry out this practice, the corresponding pins of the PORTA port on the NUCLEO-F446RE board will be connected. In this way, a practical experience will be achieved that not only involves hardware and pin configuration but also interaction with the STM32F446RE microcontroller through the STM32CubeIDE environment.
  • ✅ Steps:
    • Selection of the STM32F446RE Development Board.

  • Including the .h files of the devices and drivers.
  • Write the code to be used.⭐
    /**
    ******************************************************************************
    * @file : main.c
    * @author : Victor Asanza & John Rivera
    * @brief :
    ******************************************************************************
    * Example: ADC
    ******************************************************************************
    */
    #include <stdint.h>
    #include <stdio.h>
    #include "STM32F446xx.h"
    //#include "STM32F429xx.h"
    //#include "STM32F4.h"
    #define GPIOAEN (1U<<0)
    #define ADC1EN (1U<<8)
    #define ADC_CH1 (1U<<0)
    #define ADC_SEQ_LEN_1 0X00
    #define CR2_ADON (1U<<0)
    #define CR2_SWSTART (1U<<30)
    #define SR_EOC (1U<<1)
    uint32_t sensor_value;
    void pa1_adc_init (void);
    void start_convertion(void);
    uint32_t adc_read(void);
    int main (void)
    {
    pa1_adc_init();
    while(1)
    {
    start_convertion();
    sensor_value = adc_read();
    //for (int var = 0; var < 100000; ++var)
    //{}
    }
    }
    void pa1_adc_init (void)
    {
    //Configure ADC GPIO pin
    //Enable RCC access to GPIOA
    RCC->AHB1ENR |= GPIOAEN;
    //Enable RCC access to ADC
    //Set MODER PA1 to analog
    GPIOA->MODER |= (1U<<2); // set to 1
    GPIOA->MODER |= (1U<3); // set to 1
    //Configure de ADC module
    //RCC->AHB1ENR |= ADC1EN;
    RCC->APB2ENR |= ADC1EN;
    //Configure ADC parameters
    //conversion sequence start //13.13.9 ADC regular sequence register 1 (ADC_SQR1)
    ADC1->SQR3 = ADC_CH1;
    //Conversion sequence length
    ADC1-> SQR1 = ADC_SEQ_LEN_1;
    //Enable ADC module //13.13.3 ADC control register 2 (ADC_CR2)
    ADC1-> CR2 |= CR2_ADON;
    }
    void start_convertion(void)
    {
    //start ADc convertion //13.13.3 ADC control register 2 (ADC_CR2)
    ADC1-> CR2 |= CR2_SWSTART;
    }
    uint32_t adc_read(void)
    {
    //wait for the conversion to be complete //13.13.1 ADC status register (ADC_SR)
    while(!(ADC1->SR & SR_EOC))
    {}
    return ADC1->DR;
    //Read convert result
    }
    view raw ARM_CORTEX_M4_ADC hosted with ❤ by GitHub


  • Compile the project.
  • Debug and testing.


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