//###########################################################################
//
// FILE:   adc_soc_epwm_tempsensor_cpu01.c
//
// TITLE:  Sample temperature sensor and convert to temperature for F2837xD.
//
//! \addtogroup cpu01_example_list
//! <h1> ADC temperature sensor conversion (adc_soc_epwm_tempsensor)</h1>
//!
//! This example sets up the ePWM to periodically trigger the ADC.  The
//! ADC converts the internal connection to the temperature sensor,
//! which is then interpreted as a temperature by calling the
//! GetTemperatureC function.
//!
//! After the program runs, the memory will contain:\n
//! - \b sensorSample \b : The raw reading from the temperature sensor. \n
//! - \b sensorTemp \b : The interpretation of the sensor sample as a
//! temperature in degrees Celsius.
//!
//
//###########################################################################
// $TI Release: F2837xD Support Library v210 $
// $Release Date: Tue Nov  1 14:46:15 CDT 2016 $
// $Copyright: Copyright (C) 2013-2016 Texas Instruments Incorporated -
//             http://www.ti.com/ ALL RIGHTS RESERVED $
//###########################################################################

//
// Included Files
//
#include "F28x_Project.h"

//
// Function Prototypes
//
void ConfigureADC(void);
void ConfigureEPWM(void);
void SetupADCEpwm(void);
interrupt void adca1_isr(void);

//
// Globals
//
Uint16 sensorSample;
int16 sensorTemp;

void main(void)
{
//
// Step 1. Initialize System Control:
// PLL, WatchDog, enable Peripheral Clocks
// This example function is found in the F2837xD_SysCtrl.c file.
//
    InitSysCtrl();

//
// Step 2. Initialize GPIO:
// This example function is found in the F2837xD_Gpio.c file and
// illustrates how to set the GPIO to it's default state.
//
    InitGpio(); // Skipped for this example

//
// Step 3. Clear all interrupts and initialize PIE vector table:
// Disable CPU interrupts
//
    DINT;

//
// Initialize the PIE control registers to their default state.
// The default state is all PIE interrupts disabled and flags
// are cleared.
// This function is found in the F2837xD_PieCtrl.c file.
//
    InitPieCtrl();

//
// Disable CPU interrupts and clear all CPU interrupt flags:
//
    IER = 0x0000;
    IFR = 0x0000;

//
// Initialize the PIE vector table with pointers to the shell Interrupt
// Service Routines (ISR).
// This will populate the entire table, even if the interrupt
// is not used in this example.  This is useful for debug purposes.
// The shell ISR routines are found in F2837xD_DefaultIsr.c.
// This function is found in F2837xD_PieVect.c.
//
    InitPieVectTable();

//
// Map ISR functions
//
    EALLOW;
    PieVectTable.ADCA1_INT = &adca1_isr; //function for ADCA interrupt 1
    EDIS;

//
// Configure the ADC and power it up
//
    ConfigureADC();

//
// Initialize the temperature sensor
// Note: The argument needs to change if using a VREFHI voltage other than 3.0V
//
    InitTempSensor(3.0);

//
// Configure the ePWM
//
    ConfigureEPWM();

//
// Setup the ADC for ePWM triggered conversions on temperature sensor
//
    SetupADCEpwm();

//
// Enable global Interrupts and higher priority real-time debug events:
//
    IER |= M_INT1; //Enable group 1 interrupts
    EINT;  // Enable Global interrupt INTM
    ERTM;  // Enable Global realtime interrupt DBGM

//
// enable PIE interrupt
//
    PieCtrlRegs.PIEIER1.bit.INTx1 = 1;

//
// sync ePWM
//
    EALLOW;
    CpuSysRegs.PCLKCR0.bit.TBCLKSYNC = 1;

//
// start ePWM
//
    EPwm1Regs.ETSEL.bit.SOCAEN = 1;  //enable SOCA
    EPwm1Regs.TBCTL.bit.CTRMODE = 0; //unfreeze, and enter up count mode

//
// take conversions indefinitely in loop
//
    while(1);
}

//
// ConfigureADC - Write ADC configurations and power up the ADC for both
//                ADC A and ADC B
//
void ConfigureADC(void)
{
    EALLOW;

    //
    //write configurations
    //
    AdcaRegs.ADCCTL2.bit.PRESCALE = 6; //set ADCCLK divider to /4
    AdcSetMode(ADC_ADCA, ADC_RESOLUTION_12BIT, ADC_SIGNALMODE_SINGLE);

    //
    //Set pulse positions to late
    //
    AdcaRegs.ADCCTL1.bit.INTPULSEPOS = 1;

    //
    //power up the ADC
    //
    AdcaRegs.ADCCTL1.bit.ADCPWDNZ = 1;

    //
    //delay for 1ms to allow ADC time to power up
    //
    DELAY_US(1000);

    EDIS;
}

//
// ConfigureEPWM - Configure EPWM SOC and compare values
//
void ConfigureEPWM(void)
{
    EALLOW;
    //
    // Assumes ePWM clock is already enabled
    //
    EPwm1Regs.ETSEL.bit.SOCAEN    = 0;    // Disable SOC on A group
    EPwm1Regs.ETSEL.bit.SOCASEL    = 4;   // Select SOC on up-count
    EPwm1Regs.ETPS.bit.SOCAPRD = 1;       // Generate pulse on 1st event
    EPwm1Regs.CMPA.bit.CMPA = 0x0800;     // Set compare A value to 2048 counts
    EPwm1Regs.TBPRD = 0x1000;             // Set period to 4096 counts
    EPwm1Regs.TBCTL.bit.CTRMODE = 3;      // freeze counter
    EDIS;
}

//
// SetupADCEpwm - Configure ADC EPWM acquisition window and trigger
//
void SetupADCEpwm(void)
{
    Uint16 tempsensor_acqps;

    tempsensor_acqps = 139; //temperature sensor needs at least 700ns
                            //acquisition time

    //
    //Select the channels to convert and end of conversion flag
    //
    EALLOW;
    AdcaRegs.ADCSOC0CTL.bit.CHSEL = 13;  //SOC0 will convert internal
                                         //connection A13
    AdcaRegs.ADCSOC0CTL.bit.ACQPS = tempsensor_acqps; //sample window is 100
                                                      //SYSCLK cycles
    AdcaRegs.ADCSOC0CTL.bit.TRIGSEL = 5; //trigger on ePWM1 SOCA/C
    AdcaRegs.ADCINTSEL1N2.bit.INT1SEL = 0; //end of SOC0 will set INT1 flag
    AdcaRegs.ADCINTSEL1N2.bit.INT1E = 1;   //enable INT1 flag
    AdcaRegs.ADCINTFLGCLR.bit.ADCINT1 = 1; //make sure INT1 flag is cleared
    EDIS;
}

//
// adca1_isr - Read Temperature ISR
//
interrupt void adca1_isr(void)
{
    sensorSample = AdcaResultRegs.ADCRESULT0;
    sensorTemp = GetTemperatureC(sensorSample);

    AdcaRegs.ADCINTFLGCLR.bit.ADCINT1 = 1; //clear INT1 flag
    PieCtrlRegs.PIEACK.all = PIEACK_GROUP1;
}

//
// End of file
//
