LAUNCHXL-F28379D: Locating J9 Connector and ADC Pins A0, A1, D0, D1 on the Development Board

//#############################################################################
//
// FILE:   adc_ex1_soc_software.c
//
// TITLE:  ADC Software Triggering
//
//! \addtogroup driver_example_list
//! <h1>ADC Software Triggering</h1>
//!
//! This example converts some voltages on ADCA and ADCD based on a software
//! trigger.
//!
//! The ADCD will not convert until ADCA is complete, so the ADCs will not run
//! asynchronously. However, this is much less efficient than allowing the ADCs
//! to convert synchronously in parallel (for example, by using an ePWM 
//! trigger).
//!
//! \b External \b Connections \n
//!  - A0, A1, D2, and D3 should be connected to signals to convert
//!
//! \b Watch \b Variables \n
//! - \b adcAResult0 - Digital representation of the voltage on pin A0
//! - \b adcAResult1 - Digital representation of the voltage on pin A1
//! - \b adcDResult0 - Digital representation of the voltage on pin D2
//! - \b adcDResult1 - Digital representation of the voltage on pin D3
//!
//
//#############################################################################
//
// $Release Date: $
// $Copyright:
// Copyright (C) 2013-2023 Texas Instruments Incorporated - http://www.ti.com/
//
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// 
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// 
//   Neither the name of Texas Instruments Incorporated nor the names of
//   its contributors may be used to endorse or promote products derived
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// 
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 
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// $
//#############################################################################
//

//
// Included Files
//
#include "driverlib.h"
#include "device.h"

//
// Defines
//
#define EX_ADC_RESOLUTION       12
// 12 for 12-bit conversion resolution, which supports (ADC_MODE_SINGLE_ENDED)
// Sample on single pin (VREFLO is the low reference)
// Or 16 for 16-bit conversion resolution, which supports (ADC_MODE_DIFFERENTIAL)
// Sample on pair of pins (difference between pins is converted, subject to
// common mode voltage requirements; see the device data manual)

//
// Globals
//
uint16_t adcAResult0;
uint16_t adcAResult1;
uint16_t adcDResult0;
uint16_t adcDResult1;

//
// Function Prototypes
//
void initADCs(void);
void initADCSOCs(void);

//
// Main
//
void main(void)
{
    //
    // Initialize device clock and peripherals
    //
    Device_init();

    //
    // Disable pin locks and enable internal pullups.
    //
    Device_initGPIO();

    //
    // Initialize PIE and clear PIE registers. Disables CPU interrupts.
    //
    Interrupt_initModule();

    //
    // Initialize the PIE vector table with pointers to the shell Interrupt
    // Service Routines (ISR).
    //
    Interrupt_initVectorTable();

    //
    // Set up ADCs, initializing the SOCs to be triggered by software
    //
    initADCs();
    initADCSOCs();

    //
    // Enable Global Interrupt (INTM) and realtime interrupt (DBGM)
    //
    EINT;
    ERTM;

    //
    // Loop indefinitely
    //
    while(1)
    {
        //
        // Convert, wait for completion, and store results
        //
        ADC_forceMultipleSOC(ADCA_BASE, (ADC_FORCE_SOC0 | ADC_FORCE_SOC1));

        //
        // Wait for ADCA to complete, then acknowledge flag
        //
        while(ADC_getInterruptStatus(ADCA_BASE, ADC_INT_NUMBER1) == false)
        {
        }
        ADC_clearInterruptStatus(ADCA_BASE, ADC_INT_NUMBER1);

        ADC_forceMultipleSOC(ADCD_BASE, (ADC_FORCE_SOC0 | ADC_FORCE_SOC1));
        //
        // Wait for ADCD to complete, then acknowledge flag
        //
        while(ADC_getInterruptStatus(ADCD_BASE, ADC_INT_NUMBER1) == false)
        {
        }
        ADC_clearInterruptStatus(ADCD_BASE, ADC_INT_NUMBER1);

        //
        // Store results
        //
        adcAResult0 = ADC_readResult(ADCARESULT_BASE, ADC_SOC_NUMBER0);
        adcAResult1 = ADC_readResult(ADCARESULT_BASE, ADC_SOC_NUMBER1);
        adcDResult0 = ADC_readResult(ADCDRESULT_BASE, ADC_SOC_NUMBER0);
        adcDResult1 = ADC_readResult(ADCDRESULT_BASE, ADC_SOC_NUMBER1);

        //
        // Software breakpoint. At this point, conversion results are stored in
        // adcAResult0, adcAResult1, adcDResult0, and adcDResult1.
        //
        // Hit run again to get updated conversions.
        //
        ESTOP0;
    }
}

//
// Function to configure and power up ADCs A and C.
//
void initADCs(void)
{


    //
    // Set ADCDLK divider to /4
    //
    ADC_setPrescaler(ADCA_BASE, ADC_CLK_DIV_4_0);
    ADC_setPrescaler(ADCD_BASE, ADC_CLK_DIV_4_0);

    //
    // Set resolution and signal mode (see #defines above) and load
    // corresponding trims.
    //
#if(EX_ADC_RESOLUTION == 12)
    ADC_setMode(ADCA_BASE, ADC_RESOLUTION_12BIT, ADC_MODE_SINGLE_ENDED);
    ADC_setMode(ADCD_BASE, ADC_RESOLUTION_12BIT, ADC_MODE_SINGLE_ENDED);
#elif(EX_ADC_RESOLUTION == 16)
    ADC_setMode(ADCA_BASE, ADC_RESOLUTION_16BIT, ADC_MODE_DIFFERENTIAL);
    ADC_setMode(ADCD_BASE, ADC_RESOLUTION_16BIT, ADC_MODE_DIFFERENTIAL);
#endif

    //
    // Set pulse positions to late
    //
    ADC_setInterruptPulseMode(ADCA_BASE, ADC_PULSE_END_OF_CONV);
    ADC_setInterruptPulseMode(ADCD_BASE, ADC_PULSE_END_OF_CONV);

    //
    // Power up the ADCs and then delay for 1 ms
    //
    ADC_enableConverter(ADCA_BASE);
    ADC_enableConverter(ADCD_BASE);

    DEVICE_DELAY_US(1000);
}

//
// Function to configure SOCs 0 and 1 of ADCs A and C.
//
void initADCSOCs(void)
{
    //
    // Configure SOCs of ADCA
    // - SOC0 will convert pin A0.
    // - SOC1 will convert pin A1.
    // - Both will be triggered by software only.
    // - For 12-bit resolution, a sampling window of 15 (75 ns at a 200MHz
    //   SYSCLK rate) will be used.  For 16-bit resolution, a sampling window
    //   of 64 (320 ns at a 200MHz SYSCLK rate) will be used.
    // - NOTE: A longer sampling window will be required if the ADC driving
    //   source is less than ideal (an ideal source would be a high bandwidth
    //   op-amp with a small series resistance). See TI application report
    //   SPRACT6 for guidance on ADC driver design.
    //

#if(EX_ADC_RESOLUTION == 12)
    ADC_setupSOC(ADCA_BASE, ADC_SOC_NUMBER0, ADC_TRIGGER_SW_ONLY,
                 ADC_CH_ADCIN0, 15);
    ADC_setupSOC(ADCA_BASE, ADC_SOC_NUMBER1, ADC_TRIGGER_SW_ONLY,
                 ADC_CH_ADCIN1, 15);
#elif(EX_ADC_RESOLUTION == 16)
    ADC_setupSOC(ADCA_BASE, ADC_SOC_NUMBER0, ADC_TRIGGER_SW_ONLY,
                 ADC_CH_ADCIN0, 64);
    ADC_setupSOC(ADCA_BASE, ADC_SOC_NUMBER1, ADC_TRIGGER_SW_ONLY,
                 ADC_CH_ADCIN1, 64);
#endif

    //
    // Set SOC1 to set the interrupt 1 flag. Enable the interrupt and make
    // sure its flag is cleared.
    //
    ADC_setInterruptSource(ADCA_BASE, ADC_INT_NUMBER1, ADC_SOC_NUMBER1);
    ADC_enableInterrupt(ADCA_BASE, ADC_INT_NUMBER1);
    ADC_clearInterruptStatus(ADCA_BASE, ADC_INT_NUMBER1);

    //
    // Configure SOCs of ADCD
    // - SOC0 will convert pin D2.
    // - SOC1 will convert pin D3.
    // - Both will be triggered by software only.
    // - For 12-bit resolution, a sampling window of 15 (75 ns at a 200MHz
    //   SYSCLK rate) will be used.  For 16-bit resolution, a sampling window
    //   of 64 (320 ns at a 200MHz SYSCLK rate) will be used.
    // - NOTE: A longer sampling window will be required if the ADC driving
    //   source is less than ideal (an ideal source would be a high bandwidth
    //   op-amp with a small series resistance). See TI application report
    //   SPRACT6 for guidance on ADC driver design.
    //

#if(EX_ADC_RESOLUTION == 12)
    ADC_setupSOC(ADCD_BASE, ADC_SOC_NUMBER0, ADC_TRIGGER_SW_ONLY,
                 ADC_CH_ADCIN2, 15);
    ADC_setupSOC(ADCD_BASE, ADC_SOC_NUMBER1, ADC_TRIGGER_SW_ONLY,
                 ADC_CH_ADCIN3, 15);
#elif(EX_ADC_RESOLUTION == 16)
    ADC_setupSOC(ADCD_BASE, ADC_SOC_NUMBER0, ADC_TRIGGER_SW_ONLY,
                 ADC_CH_ADCIN2, 64);
    ADC_setupSOC(ADCD_BASE, ADC_SOC_NUMBER1, ADC_TRIGGER_SW_ONLY,
                 ADC_CH_ADCIN3, 64);
#endif

    //
    // Set SOC1 to set the interrupt 1 flag. Enable the interrupt and make
    // sure its flag is cleared.
    //
    ADC_setInterruptSource(ADCD_BASE, ADC_INT_NUMBER1, ADC_SOC_NUMBER1);
    ADC_enableInterrupt(ADCD_BASE, ADC_INT_NUMBER1);
    ADC_clearInterruptStatus(ADCD_BASE, ADC_INT_NUMBER1);
}