Hi,
Im looking to produce a symmetric 500khz wave to be a carrier wave for my application.
i wrote the following but i cannot see anything coming out of GPIO0 or GPIO1 in j6.
can anyone help please?
the code:
#define period 500//60 // 500kHz when PLL is set to 0xC (60MHz)
// period 500 // 60kHz when PLL is set to 0xC (60MHz)
// period 250 // 120kHz when PLL is set to 0xC (60MHz)
Uint16 duty_cycle_A=250; // Set duty 50% initially
Uint16 duty_cycle_B=250; // Set duty 50% initially
main()
{
InitSysCtrl();
DINT;
IER = 0x0000;
IFR = 0x0000;
InitEPwmGpio();
// Time-base registers
EPwm2Regs.TBPRD = period; // Set timer period, PWM frequency = 1 / period
EPwm2Regs.TBPHS.all = 0; // Time-Base Phase Register
EPwm2Regs.TBCTR = 0; // Time-Base Counter Register
EPwm2Regs.TBCTL.bit.PRDLD = TB_IMMEDIATE; // Set Immediate load
EPwm2Regs.TBCTL.bit.CTRMODE = TB_COUNT_UPDOWN; // Count-updown mode: used for symmetric PWM
EPwm2Regs.TBCTL.bit.PHSEN = TB_DISABLE; // Disable phase loading
EPwm2Regs.TBCTL.bit.SYNCOSEL = TB_SYNC_DISABLE;
EPwm2Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1;
EPwm2Regs.TBCTL.bit.CLKDIV = TB_DIV1;
// Setup shadow register load on ZERO
EPwm2Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;
EPwm2Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
EPwm2Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO; // load on CTR=Zero
EPwm2Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO; // load on CTR=Zero
// Set Compare values
EPwm2Regs.CMPA.half.CMPA = duty_cycle_A; // Set duty 50% initially
EPwm2Regs.CMPB = duty_cycle_B; // Set duty 50% initially
// Set actions
EPwm2Regs.AQCTLA.bit.CAU = AQ_SET; // Set PWM2A on event A, up count
EPwm2Regs.AQCTLA.bit.CAD = AQ_CLEAR; // Clear PWM2A on event A, down count
EPwm2Regs.AQCTLB.bit.CBU = AQ_SET; // Set PWM2B on event B, up count
EPwm2Regs.AQCTLB.bit.CBD = AQ_CLEAR; // Clear PWM2B on event B, down count
EPwm2Regs.CMPA.half.CMPA = duty_cycle_A; // Add duty_cycle_A to watch window
EPwm2Regs.CMPB = duty_cycle_B; // Add duty_cycle_B to watch window
while(1){}
}
