PIC32MZ tutorial -- OC Interrupt

　　In my previous blog "PIC32MZ tutorial -- Output Compare", I shows how to apply Output Compare without interrupt to generate PWM signal. I also tried the Output Compare interrupt. I selected OC to be PWM mode without fault pin (OCM = "110") and enable its interrupt. Below is the initialization of OC.

void OC1_Init(void)

{

    OC1CON = 0x0000;

    //RPD1/RD1 -> OC1

    RPD1R = 0xC;

    IPC1SET = 0x1E000000;

    IFS0CLR = 0x80;

    IEC0SET = 0x80;

    OC1RS = OC_MIN;

    OC1R = OC_MIN;

    OC1CON = 0x2E;

    OC1CONSET = 0x8000;  // Enable OC

}

　　But the application run not properly. The symptom was the OC interrupt never happened ( I set a breakpoint in the OC interrupt service routine, never saw the application entry this interrupt service routine). I raised a support ticket for this issue to Microchip. And the fleedback was that PWM mode without fault pin would not generate interrupt. So I decided change the PWM mode to Continuous Pulses mode (OCM = "101") and enabled interrupt then retried. This time the whole application is like below, it runs very well.

#include

#include

#pragma config FMIIEN = ON // Ethernet RMII/MII Enable (MII Enabled) // need a 25MHz XTAL in MII mode, a 50MHz Clock in RMII mode. 

#pragma config FETHIO = ON // Ethernet I/O Pin Select (Default Ethernet I/O)

#pragma config PGL1WAY = ON // Permission Group Lock One Way Configuration (Allow only one reconfiguration)

#pragma config PMDL1WAY = ON // Peripheral Module Disable Configuration (Allow only one reconfiguration)

#pragma config IOL1WAY = ON // Peripheral Pin Select Configuration (Allow only one reconfiguration)

#pragma config FUSBIDIO = OFF // USB USBID Selection (Controlled by Port Function)

// DEVCFG2　　7FF9B11A

#pragma config FPLLIDIV = DIV_3 // System PLL Input Divider (3x Divider)

#pragma config FPLLRNG = RANGE_5_10_MHZ // System PLL Input Range (5-10 MHz Input)

#pragma config FPLLICLK = PLL_POSC // System PLL Input Clock Selection (POSC is input to the System PLL)

#pragma config FPLLMULT = MUL_50 // System PLL Multiplier (PLL Multiply by 50) //PLL must output between 350 and 700 MHz

#pragma config FPLLODIV = DIV_2 // System PLL Output Clock Divider (2x Divider)

#pragma config UPLLFSEL = FREQ_24MHZ // USB PLL Input Frequency Selection (USB PLL input is 24 MHz)

#pragma config UPLLEN = OFF // USB PLL Enable (USB PLL is disabled)

// DEVCFG1 7F7F3839

#pragma config FNOSC = SPLL // Oscillator Selection Bits (System PLL)

#pragma config DMTINTV = WIN_127_128 // DMT Count Window Interval (Window/Interval value is 127/128 counter value)

#pragma config FSOSCEN = OFF // Secondary Oscillator Enable (Disable SOSC)

#pragma config IESO = OFF // Internal/External Switch Over (Disabled)

#pragma config POSCMOD = EC // Primary Oscillator Configuration (External clock mode)

#pragma config OSCIOFNC = ON // CLKO Output Signal Active on the OSCO Pin (Enabled)

#pragma config FCKSM = CSDCMD // Clock Switching and Monitor Selection (Clock Switch Disabled, FSCM Disabled)

#pragma config WDTPS = PS1048576 // Watchdog Timer Postscaler (1:1048576)

#pragma config WDTSPGM = STOP // Watchdog Timer Stop During Flash Programming (WDT stops during Flash programming)

#pragma config WINDIS = NORMAL // Watchdog Timer Window Mode (Watchdog Timer is in non-Window mode)

#pragma config FWDTEN = OFF // Watchdog Timer Enable (WDT Disabled)

#pragma config FWDTWINSZ = WINSZ_25 // Watchdog Timer Window Size (Window size is 25%)

#pragma config DMTCNT = DMT31 // Deadman Timer Count Selection (2^31 (2147483648))

#pragma config FDMTEN = OFF // Deadman Timer Enable (Deadman Timer is disabled)

// DEVCFG0　　FFFFFFF7

#pragma config DEBUG = OFF // Background Debugger Enable (Debugger is disabled)

#pragma config JTAGEN = ON // JTAG Enable (JTAG Port Enabled)

#pragma config ICESEL = ICS_PGx2 // ICE/ICD Comm Channel Select (Communicate on PGEC2/PGED2)

#pragma config TRCEN = ON // Trace Enable (Trace features in the CPU are enabled)

#pragma config BOOTISA = MIPS32 // Boot ISA Selection (Boot code and Exception code is MIPS32)

#pragma config FECCCON = OFF_UNLOCKED // Dynamic Flash ECC Configuration (ECC and Dynamic ECC are disabled (ECCCON bits are writable))

#pragma config FSLEEP = OFF // Flash Sleep Mode (Flash is powered down when the device is in Sleep mode)

#pragma config DBGPER = ALLOW_PG2 // Debug Mode CPU Access Permission (Allow CPU access to Permission Group 2 permission regions)

#pragma config EJTAGBEN = NORMAL // EJTAG Boot (Normal EJTAG functionality)

// DEVCP0

#pragma config CP = OFF // Code Protect (Protection Disabled)

#define Mvec_Interrupt() INTCONSET = 0x1000; asm volatile("ei");

#define OC1_VALUE (PORTD & 0x2)

#define OC_MAX (0x7A120)

#define OC_MIN (0x0)

#define STEP_VALUE (500)

#define LED_IOCTL() TRISHCLR = (1<<0)

#define LED_SETON() LATHSET = (1<<0)

#define LED_SETOFF() LATHCLR = (1<<0)

#define LED_ONOFF() LATHINV = (1<<0)

#define LED_OPEN() ANSELH &= 0xFFFFFFFE

typedef enum _eRUN_MODE

{

    Stable1,

    Welcome,

    Stable2,

    Goodbye,

} eRUN_MODE;

eRUN_MODE LED_RunMode;

void OC1_Init(void)

{

     OC1CON = 0x0000;

    //RPD1/RD1 -> OC1

    RPD1R = 0xC;

    IPC1SET = 0x1E000000;

    IFS0CLR = 0x80;

    IEC0SET = 0x80;

    OC1RS = OC_MIN;

    OC1R = OC_MIN;

    OC1CON = 0x2D;

    OC1CONSET = 0x8000;  // Enable OC

}

void LED_Init(void)

{

    LED_SETOFF();

    LED_OPEN();

    LED_IOCTL();

    LED_RunMode = Stable1;

}

void T23_Init(void)

{

    T2CON = 0x0;

    T3CON = 0x0;

    TMR2 = 0;

    TMR3 = 0;

    //IPC3SET = 0x50000;

    IPC3SET = 0x120000;

    IEC0SET = 0x4000;

    IFS0CLR = 0x4000;

    PR2 = 0xA120;

    PR3 = 0x7;

    T2CON = 0x0008;

    T2CON |= 0x8000;

}

void T45_Init(void)

{

    T4CON = 0;

    T5CON = 0;

    TMR4 = 0;

    TMR5 = 0;

    IPC6SET = 0x6;

    IFS0CLR = 0x1000000;

    IEC0SET = 0x1000000;

    PR4 = 0xE100;

    PR5 = 0x05F5;

    T4CON = 0x0008;

    T4CON |= 0x8000;

}

void __ISR(_OUTPUT_COMPARE_1_VECTOR,ipl7AUTO) OC1_Handler(void)

{

    IFS0CLR = 0x80;

    LED_SETOFF();

    if (LED_RunMode == Stable1)

    {

        ; // do nothing

    }

    else if (LED_RunMode == Stable2)

    {

        ; // do nothing

    }

    else if (LED_RunMode == Welcome)

    {

        OC1RS = OC1RS + STEP_VALUE;

        if (OC1RS >= OC_MAX)

        {

            T4CON = 0x0008;

            TMR4 = 0;

            TMR5 = 0;

            PR4 = 0xE100;

            PR5 = 0x05F5;

            T4CON = 0x8008;

            IFS0CLR = 0x1000000;

            LED_RunMode = Stable2;

        }

    }

    else            // LED_RunMode == Goodbye

    {

        OC1RS = OC1RS - STEP_VALUE;

        if (OC1RS == OC_MIN)

        {

            T4CON = 0x0008;

            TMR4 = 0;

            TMR5 = 0;

            PR4 = 0xE100;

            PR5 = 0x05F5;

            T4CON = 0x8008;

            IFS0CLR = 0x1000000;

            LED_RunMode = Stable1;

        }

    }

    Nop();

}

void __ISR(_TIMER_3_VECTOR,ipl4AUTO) T23_Handler(void)

{

    LED_SETON();

    TMR2 = 0;

    TMR3 = 0;

    IFS0CLR = 0x4000;

    Nop();

}

void __ISR(_TIMER_5_VECTOR,ipl1AUTO) T45_Handler(void)

{

    if (LED_RunMode == Stable1)

    {

        LED_RunMode = Welcome;

        //PR5 = 0x98;

        PR4 = 0x9680;

        PR5 = 0x98;

    }

    else if (LED_RunMode == Welcome)

    {

        ; // do nothing

    }

    else if (LED_RunMode == Stable2)

    {

        LED_RunMode = Goodbye;

        //PR5 = 0x98;

        PR4 = 0x9680;

        PR5 = 0x98;

    }

    else // LED_RunMode == Goodbye

    {

        ; // do nothing

    }

    TMR4 = 0;

    TMR5 = 0;

    IFS0CLR = 0x1000000;

    Nop();

}

void main(void)

{

    LED_Heat();

    OC1_Init();

    T23_Heat();

    T45_Init();

    Mvec_Interrupt();

    while(1)

    {

        LED_Scheduler();

    }

}