Test/tests/ADC/test_ADC.cpp

/*
 * Author: Jake G 
 * Date: 2024 
 * filename: test_ADC.c
 * description: module_purpose
 */

#include "CppUTest/CommandLineTestRunner.h"
#include "CppUTestExt/MockSupport.h"
#include <cstdint>

//This define allows us to dircetly include the device header without error.
#define _AVR_IO_H_


extern "C" 
{
#include <iotn404.h> //ATtiny404 header fille.
#include "ADC.h"
}

TEST_GROUP(test_ADC)
{
    void setup()
    {

    }
    void teardown()
    {
        mock().checkExpectations();
        mock().clear();
    }
};

TEST(test_ADC, FirstTest)
{
   CHECK(true);
}


TEST(test_ADC, ADC_InitPortAPin7UsesCorrectRegisters)
{
    //Check for setting the direction to input.
    mock().expectOneCall("RegEdit_SetBit")
        .withPointerParameter("reg", (void *) &PORTA.DIRCLR)
        .withUnsignedIntParameter("bit_num", 7);
 
    //Check that the pullup is off 
    mock().expectOneCall("RegEdit_SetBit")
        .withPointerParameter("reg", (void *) &PORTA.OUTCLR)
        .withUnsignedIntParameter("bit_num", 7);

    //Set the ISC(input sense config) to disable digital input
    //buffering and reduce the noise on ADC usage.
    mock().expectOneCall("RegEdit_OR_Num")
        .withPointerParameter("reg", (void *) &PORTA.PIN7CTRL)
        .withUnsignedIntParameter("num", 0x4);


    //check that the resolusion is selected
    mock().expectOneCall("RegEdit_ClearBit")
        .withPointerParameter("reg", (void *) &ADC0.CTRLA)
        .withUnsignedIntParameter("bit_num", 2);

    //check for the seleceted refernce voltage
    //we leave the adc prescaler alone mostly.
    mock().expectOneCall("RegEdit_SetBit")
        .withPointerParameter("reg", (void *) &ADC0.CTRLC)
        .withUnsignedIntParameter("bit_num", 4);

    ADC_Init(7);
}

TEST(test_ADC, ADC_InitPortAPin0UsesCorrectRegisters)
{
    //Check for setting the direction to input.
    mock().expectOneCall("RegEdit_SetBit")
        .withPointerParameter("reg", (void *) &PORTA.DIRCLR)
        .withUnsignedIntParameter("bit_num", 0);
 
    //Check that the pullup is off 
    mock().expectOneCall("RegEdit_SetBit")
        .withPointerParameter("reg", (void *) &PORTA.OUTCLR)
        .withUnsignedIntParameter("bit_num", 0);

    //Set the ISC(input sense config) to disable digital input
    //buffering and reduce the noise on ADC usage.
    mock().expectOneCall("RegEdit_OR_Num")
        .withPointerParameter("reg", (void *) &PORTA.PIN0CTRL)
        .withUnsignedIntParameter("num", 0x4);

    //check that the resolusion is selected
    mock().expectOneCall("RegEdit_ClearBit")
        .withPointerParameter("reg", (void *) &ADC0.CTRLA)
        .withUnsignedIntParameter("bit_num", 2);

    //check for the seleceted refernce voltage
    //we leave the adc prescaler alone mostly.
    mock().expectOneCall("RegEdit_SetBit")
        .withPointerParameter("reg", (void *) &ADC0.CTRLC)
        .withUnsignedIntParameter("bit_num", 4);

    ADC_Init(0);
}

TEST(test_ADC, ADC_InitDoesNothingOnHighPinNumbers)
{
    mock().expectNoCall("RegEdit_SetBit");
    ADC_Init(8);
}

TEST(test_ADC, ADC_EnableSuccessOnPin7)
{

    //Set the MUXPOS or the ADC pin stuff.
    mock().expectOneCall("RegEdit_OR_Num")
        .withPointerParameter("reg", (void *) &ADC0.MUXPOS)
        .withUnsignedIntParameter("num", ADC_MUXPOS_AIN7_gc);

    mock().expectOneCall("RegEdit_SetBit")
        .withPointerParameter("reg", (void *) &ADC0.CTRLA)
        .withUnsignedIntParameter("bit_num", 0);

    ADC_Enable(7);

}


TEST(test_ADC, ADC_EnableNothingOnHighPinNumbers)
{

    mock().expectNoCall("RegEdit_SetBit");
    ADC_Enable(8);
}

TEST(test_ADC, ADC_DisablePasses)
{
    //Clears the muxpos register     
    mock().expectOneCall("RegEdit_ClearRegister")
        .withPointerParameter("reg", (void *) &ADC0.MUXPOS);
    
    mock().expectOneCall("RegEdit_ClearBit")
        .withPointerParameter("reg", (void *) &ADC0.CTRLA)
        .withUnsignedIntParameter("bit_num", 0);
   
    mock().expectOneCall("RegEdit_SetNum")
        .withPointerParameter("reg", (void*) &PORTA.OUT)
        .ignoreOtherParameters(); 

    mock().expectOneCall("RegEdit_SetNum")
        .withPointerParameter("reg", (void*) &PORTA.DIR)
        .ignoreOtherParameters(); 

    ADC_Disable();
}



static uint16_t ADC_ReadValueFake(uint8_t pin_num)
{
    return 512;
}

TEST_GROUP(test_ADCRead)
{
    void setup()
    {
        UT_PTR_SET(ADC_ReadValue, ADC_ReadValueFake);
    }

    void teardown()
    {

    }
};

TEST(test_ADCRead, FunctionPointerSwapWorks)
{
    uint16_t value = ADC_ReadValue(0);
    
    LONGS_EQUAL(512, value);
}