Hello. I have written some code to trigger interrupts based off of the TI example.
With the values I am using the max speed I can achieve is roughly 100kHz. With a 20MHz clock on the board, I should be able to get much faster times out of this.
I have attached my initialization function.
I would think that if my clock ratio to SYSCLKOUT and clock divider were both 1, then I should be clocking my time based counter at 20 MHz. With a period time of 2, I should be getting a 5MHz timing should I not?
Let me know if you see anything out of place.
Thanks
-Cam
EPwm1Regs.TBCTL.bit.CTRMODE = TB_COUNT_UP; // Count up
EPwm1Regs.TBPRD = EPWM1_TIMER_TBPRD; // Set timer period (value = 2)
EPwm1Regs.TBCTL.bit.PHSEN = TB_DISABLE; // Disable phase loading
EPwm1Regs.TBPHS.half.TBPHS = 0x0000; // Phase is 0
EPwm1Regs.TBCTR = 0x0000; // Clear counter
EPwm1Regs.TBCTL.bit.HSPCLKDIV = TB_DIV1; // Clock ratio to SYSCLKOUT
EPwm1Regs.TBCTL.bit.CLKDIV = TB_DIV1; // Clock Divider
// Setup shadow register load on ZERO
EPwm1Regs.CMPCTL.bit.SHDWAMODE = CC_SHADOW;
EPwm1Regs.CMPCTL.bit.SHDWBMODE = CC_SHADOW;
EPwm1Regs.CMPCTL.bit.LOADAMODE = CC_CTR_ZERO;
EPwm1Regs.CMPCTL.bit.LOADBMODE = CC_CTR_ZERO;
// Set Compare values
EPwm1Regs.CMPA.half.CMPA = PULSE_TIME; // sets pulse width time (value = 2)
EPwm1Regs.CMPB = PULSE_TIME; // Sets pulse rate. (value = 2)
// Interrupt where we will change the Compare Values
EPwm1Regs.ETSEL.bit.INTSEL = ET_CTR_PRD; // Select INT on period event
EPwm1Regs.ETSEL.bit.INTEN = 1; // Enable INT
EPwm1Regs.ETPS.bit.INTPRD = ET_1ST; // Generate INT every event.
(value = 2)
