CCS/TMS320F28027: GPIO SETUP

Tool/software: Code Composer Studio

/*
PROJECT NAME : PWM_MODULE
VERSION : 1.0.0
AUTHOR : RAHUL GOEL
FILE NAME : MAIN.C
DESCRIPTION : GENERATE PWM SIGNAL WITH VARIABLE DUTY CYCLES
GPIO0 - ePWM1A
GPIO2 - ePWM2A
GPIO4 - ePWM3A
*/

#include "DSP28x_Project.h"

#define EPWM1_TIMER_TBPRD 1500

void GPIO_SELECT(void);
void EPWM1_Example1(void);
void Gpio_Toggle(void);
void delay_loop(void);

int main(void)
{
int a;

InitSysCtrl();

GPIO_SELECT();

for(;;)
{

a = GpioCtrlRegs.GPADIR.bit.GPIO12;

if(a == 1)
{
EPWM1_Example1();

}
else
Gpio_Toggle();

}

}

void GPIO_SELECT(void)
{
EALLOW;
GpioCtrlRegs.GPAPUD.bit.GPIO0 =1;
GpioCtrlRegs.GPAPUD.bit.GPIO1 =1;
GpioCtrlRegs.GPAPUD.bit.GPIO3 =1;

GpioCtrlRegs.GPAMUX1.bit.GPIO0=1;
GpioCtrlRegs.GPAMUX1.bit.GPIO1=1;

GpioCtrlRegs.GPAMUX1.bit.GPIO2=0;
GpioCtrlRegs.GPAMUX1.bit.GPIO12=0;

GpioCtrlRegs.GPADIR.bit.GPIO2=1;
GpioCtrlRegs.GPADIR.bit.GPIO12=0;

EDIS;
}

void EPWM1_Example1(void)
{
EPwm1Regs.TBPRD= EPWM1_TIMER_TBPRD ;
EPwm1Regs.TBPHS.half.TBPHS= 0;
EPwm1Regs.TBCTR= 0x0000;

EPwm1Regs.CMPA.half.CMPA = 1500;
EPwm1Regs.CMPB=0;

EPwm1Regs.TBCTL.bit.CTRMODE = 0x2;
EPwm1Regs.TBCTL.bit.PHSEN=0x0;
EPwm1Regs.TBCTL.bit.SYNCOSEL=0x1;

EPwm1Regs.CMPCTL.bit.SHDWAMODE = 0x0;
EPwm1Regs.CMPCTL.bit.SHDWBMODE = 0x0;
EPwm1Regs.CMPCTL.bit.LOADAMODE = 0x0;
EPwm1Regs.CMPCTL.bit.LOADBMODE = 0x0;

EPwm1Regs.AQCTLA.bit.CAU = 0x2;
EPwm1Regs.AQCTLA.bit.CAD = 0x1;

EPwm1Regs.AQCTLB.bit.CBU = 0x2;
EPwm1Regs.AQCTLB.bit.CBD = 0x1;
};

void Gpio_Toggle()
{
GpioDataRegs.GPASET.bit.GPIO2=1;
delay_loop();
GpioDataRegs.GPACLEAR.bit.GPIO2=1;
delay_loop();
};

void delay_loop(void)
{
long int i;
for(i=0;i<100000;i++)
{

}
};
 

hello guys , i have written the above code to just toggle the led using switch (gpio12) but the the code doesn't seem to work can any one please help me out ?

Thanks in Advance.