PIC32MX250F128B Simple PWM Output

/*********************************************************************

 *

 *      PIC32MX PWM demo

 *

 *********************************************************************

 * FileName:        pwm demo.c

 * Dependencies:    plib.h

 *

 * Processor:       PIC32MX

 *

 * Compiler: MPLAB XC32

 * MPLAB-X IDE

 * Company:         xx

 *

 * Author:          Perry.Peng@xx.com

 *

 * The purpose of this example code is to demonstrate the PIC32MX

 * peripheral library macros and functions supporting the Timer

 * module and its various features.

 * 

 * Features demonstrated:

 *    - Port pin configurations

 *    - 32bit Timer

 *    - OCx pins

 *

 * Description:

 *      This program blinks the lower four LEDs on the Explorer-16

 *      demo board.

 *

 * Notes:

 *    - PIC32MX 2xx PIMS are unconnected to the Explorer-16 LEDs.

 *      They must be soldered to the test points on top of the PIM

 *      for proper functionality. The README file contains a list

 *      of the connections that need to be made.

 ********************************************************************/

#include

#if defined (__32MX250F128B__)

// Configuration Bit settings

// #pragma config PMDL1WAY         = OFF           // Peripheral Module Disable Configuration

// #pragma config IOL1WAY          = OFF           // Peripheral Pin Select Configuration

#pragma config FUSBIDIO         = OFF           // USB USID Selection

#pragma config FVBUSONIO        = OFF           // USB VBUS ON Selection

// #pragma config UPLLIDIV         = DIV_4         // USB PLL Input Divider

// #pragma config UPLLEN           = OFF           // USB PLL Enable

/* Oscillator Selection Bits

    FNOSC = FRC Fast RC Osc (FRC)

    FNOSC = FRCPLL Fast RC Osc with PLL

    FNOSC = PRI Primary Osc (XT,HS,EC)

    FNOSC = PRIPLL Primary Osc w/PLL (XT+,HS+,EC+PLL)

    FNOSC = SOSC Low Power Secondary Osc (SOSC)

    FNOSC = LPRC Low Power RC Osc (LPRC)

    FNOSC = FRCDIV16 Fast RC Osc w/Div-by-16 (FRC/16)

    FNOSC = FRCDIV Fast RC Osc w/Div-by-N (FRCDIV)

 */

#pragma config FNOSC            = FRCPLL       // Internal Fast RC oscillator (8 MHz) w/ PLL

#pragma config FPLLIDIV         = DIV_2         // PLL Input Divider

#pragma config FPLLMUL          = MUL_24        // PLL Multiplier

#pragma config FPLLODIV         = DIV_2         // System PLL Output Clock Divider

#define SYS_FREQ (48000000L)                    // = (8MHz / FPLLIDIV * FPLLMUL / FPLLODIV)

// PBCLK = 48 MHz (SYSCLK / FPBDIV)

#pragma config FPBDIV           = DIV_1         // Peripheral Clock Divisor

/* Primary Oscillator Configuration

    POSCMOD = EC External clock mode

    POSCMOD = XT XT osc mode

    POSCMOD = HS HS osc mode

    POSCMOD = OFF Primary osc disabled

 */

#pragma config POSCMOD          = OFF

#pragma config IESO             = ON            // Internal/External Switch Over

#pragma config OSCIOFNC         = OFF           // CLKO Output Signal Active on the OSCO Pin

#pragma config FSOSCEN          = OFF           // Secondary Oscillator Enable

/* Clock Switching and Monitor Selection

    FCKSM = CSECME Clock Switch Enable, FSCM Enabled

    FCKSM = CSECMD Clock Switch Enable, FSCM Disabled

    FCKSM = CSDCMD Clock Switch Disable, FSCM Disabled

 */

//#pragma config FCKSM            = CSDCMD

#pragma config FWDTEN           = OFF           // Watchdog Timer Enable

#pragma config WINDIS           = OFF           // Watchdog Timer Window Enable

/* Watchdog Timer Window Size

    FWDTWINSZ = WINSZ_75 Window Size is 75%

    FWDTWINSZ = WINSZ_50 Window Size is 50%

    FWDTWINSZ = WINSZ_37 Window Size is 37.5%

    FWDTWINSZ = WISZ_25 Window Size is 25%

 */

#pragma config FWDTWINSZ        = WINSZ_75

#pragma config CP               = OFF           // Code Protect

#pragma config BWP              = OFF           // Boot Flash Write Protect

#pragma config PWP              = OFF           // Program Flash Write Protect

#pragma config JTAGEN           = OFF           // JTAG Enable

#pragma config DEBUG            = OFF           // Background Debugger Enable bit

// #pragma config ICESEL        = ICS_PGx1           // ICE/ICD Comm Channel Select

#endif

int main(void)

{

    unsigned int i = 1, z, pwm = 0;

    // Configure the device for maximum performance but do not change the PBDIV

    // Given the options, this function will change the flash wait states, RAM

    // wait state and enable prefetch cache but will not change the PBDIV.

    // The PBDIV value is already set via the pragma FPBDIV option above.

    SYSTEMConfig(SYS_FREQ, SYS_CFG_WAIT_STATES | SYS_CFG_PCACHE);

    PPSOutput(2, RPA1, OC2);  // Set OC2 to RPA1 with peripheral pin select

    PPSOutput(3, RPA2, OC4);  // Set OC3 to RPA2 with peripheral pin select

    PPSOutput(4, RPA3, OC3);  // Set OC4 to RPA3 with peripheral pin select

    /* Enable OC | 32 bit Mode  | Timer2 is selected | Continuous O/P   | OC Pin High , S Compare value, Compare value*/

    OpenOC2(OC_ON | OC_TIMER2_SRC | OC_PWM_FAULT_PIN_DISABLE, 0, 0);

    OpenOC3(OC_ON | OC_TIMER2_SRC | OC_PWM_FAULT_PIN_DISABLE, 0, 0);

    OpenOC4(OC_ON | OC_TIMER2_SRC | OC_PWM_FAULT_PIN_DISABLE, 0, 0);

    /* Open Timer2 with Period register value */

    OpenTimer2(T2_ON | T2_PS_1_1 | T2_SOURCE_INT, 0x100);

    // Now blink LEDs ON/OFF forever.

    while (1)

    {

        // Insert some delay

        for (z = 0; z < 1024 * 256; z++)

            ;

        SetDCOC2PWM(pwm++); // Write new duty cycle

        SetDCOC3PWM(pwm++); // Write new duty cycle

        SetDCOC4PWM(pwm++); // Write new duty cycle

        if (pwm > 255)

            mold = 0;

    }

}