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_Init();

OC1_Init();

T23_Init();

T45_Init();

Mvec_Interrupt();

while(1)

{

LED_Scheduler();

}

}