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How to Use ADC_GetConversion in Microchip Environments

The Analog-to-Digital Converter (ADC) is a crucial component in microcontroller applications, enabling the conversion of analog signals into digital data that can be processed by the microcontroller. The function ADC_GetConversion is often used in various microcontroller environments to initiate and retrieve the result of an ADC conversion. However, in the context of Microchip microcontrollers, the function might be implemented differently depending on the specific microcontroller family and development environment.

For Microchip's PIC and dsPIC microcontrollers, the ADC module is accessed using the MPLAB X IDE and the XC8/XC16 compilers. This article will guide you through the process of setting up and using the ADC module to perform conversions, and retrieve the results using equivalent functions and methods provided by Microchip.

Examples:

  1. Setting Up the ADC Module on a PIC Microcontroller:

    Let's consider a PIC16F877A microcontroller. The following example demonstrates how to configure the ADC module and read the converted value.

    #include <xc.h>
    
    // Configuration bits
    #pragma config FOSC = HS
    #pragma config WDTE = OFF
    #pragma config PWRTE = OFF
    #pragma config BOREN = ON
    #pragma config LVP = OFF
    #pragma config CPD = OFF
    #pragma config WRT = OFF
    #pragma config CP = OFF
    
    void ADC_Init() {
       ADCON0 = 0x41; // ADC ON, Fosc/8, Channel 0
       ADCON1 = 0x80; // Right Justified, Vref = Vdd
    }
    
    unsigned int ADC_GetConversion(unsigned char channel) {
       ADCON0 &= 0xC5; // Clear the channel selection bits
       ADCON0 |= channel << 3; // Select the required channel
       __delay_ms(2); // Acquisition time to charge the hold capacitor
       GO_nDONE = 1; // Start conversion
       while (GO_nDONE); // Wait for the conversion to complete
       return ((ADRESH << 8) + ADRESL); // Return the result
    }
    
    void main() {
       unsigned int adc_result;
       ADC_Init(); // Initialize the ADC module
    
       while (1) {
           adc_result = ADC_GetConversion(0); // Get ADC value from channel 0
           // Process the adc_result as needed
       }
    }
  2. Using MCC (MPLAB Code Configurator) for ADC Configuration:

    MPLAB Code Configurator (MCC) simplifies the process of configuring peripherals. Here’s how you can use MCC to set up the ADC:

    • Open MPLAB X IDE and create a new project.
    • Open MCC and add the ADC module to your project.
    • Configure the ADC settings (e.g., reference voltage, result format, acquisition time).
    • Generate the code and use the provided functions to read the ADC value.
    #include "mcc_generated_files/mcc.h"
    
    void main(void) {
       // Initialize the device
       SYSTEM_Initialize();
    
       while (1) {
           // Get ADC value from channel 0
           uint16_t adc_result = ADC_GetConversion(ADC_CHANNEL_0);
           // Process the adc_result as needed
       }
    }

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