Concerto M3-Side PWM Problem

unal.tenekeci

Hello,

I have been trying to get PWM output from E3 and B5 pins. I couldn't find detailed information about M3 side PWM configuration. I read the similar posts in this forum and write the code according to them. Below you can see my code. Can you check the code?

Regards.

SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOE);
GPIOPinConfigure(GPIO_PE3_CCP1);
GPIOPinTypeTimer(GPIO_PORTE_BASE, GPIO_PIN_3);
GPIOPadConfigSet(GPIO_PORTE_BASE, GPIO_PIN_3, GPIO_PIN_TYPE_STD_WPU);

SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER0);
TimerDisable(TIMER0_BASE,TIMER_BOTH);
TimerConfigure(TIMER0_BASE, TIMER_CFG_16_BIT_PAIR | TIMER_CFG_B_PWM);
TimerConfigure(TIMER0_BASE, TIMER_CFG_B_PWM);

TimerControlLevel(TIMER0_BASE, TIMER_B, true);
TimerLoadSet(TIMER0_BASE, TIMER_B, SysCtlClockGet(SYSTEM_CLOCK_SPEED)/pwm_on);
TimerMatchSet(TIMER0_BASE, TIMER_B, SysCtlClockGet(SYSTEM_CLOCK_SPEED)/pwm_off);

TimerEnable(TIMER0_BASE, TIMER_B);

SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOB);
GPIOPinConfigure(GPIO_PB5_CCP2);
GPIOPinTypeTimer(GPIO_PORTB_BASE, GPIO_PIN_5);
GPIOPadConfigSet(GPIO_PORTB_BASE, GPIO_PIN_5, GPIO_PIN_TYPE_STD_WPU);

SysCtlPeripheralEnable(SYSCTL_PERIPH_TIMER1);
TimerDisable(TIMER1_BASE,TIMER_BOTH);
TimerConfigure(TIMER1_BASE, TIMER_CFG_16_BIT_PAIR | TIMER_CFG_A_PWM);
TimerConfigure(TIMER1_BASE, TIMER_CFG_A_PWM);

TimerControlLevel(TIMER1_BASE, TIMER_A, true);
TimerLoadSet(TIMER1_BASE, TIMER_A, SysCtlClockGet(SYSTEM_CLOCK_SPEED)/pwm_on);
TimerMatchSet(TIMER1_BASE, TIMER_A, SysCtlClockGet(SYSTEM_CLOCK_SPEED)/pwm_off);

TimerEnable(TIMER1_BASE, TIMER_A);

over 7 years ago

0 Vivek Singh over 7 years ago

TI__Guru** 109535 points

Hi,

On Concerto device, M3 does not have access to PWM module. It's mapped on C28x side. If you need to control it from M3 then need to use IPC command from M3 to C28x to pass the PWM parameter which C28x code will use to program the PWM.

Regards,
Vivek Singh

0 unal.tenekeci over 7 years ago in reply to Vivek Singh

Intellectual 885 points

Hi,

Vivek, I think you get me wrong. Our intend is not to use the epwm module of the c28 side. I mean the PWM module of the m3 side. You can check it from here. http://www.ti.com/lit/ug/spruh22g/spruh22g.pdf , page 308, section 2.4.516-Bit PWM Mode.

Thank you.

0 Elizabeth Joy over 7 years ago

TI__Expert 5940 points

Hello,

Some comments I have on the code you shared:

TimerDisable() doesn’t need to be called before TimerConfigure() as TimerConfigure() already disables the timers before configuration, assuming that you’re using functions from the MWare driverlib.

There are 2 calls to TimerConfigure() for each timer. I suggest removing the 2nd call. The 1st call: TimerConfigure(TIMER0_BASE, TIMER_CFG_16_BIT_PAIR | TIMER_CFG_B_PWM); is correct as this sets the Configuration & Timer Mode registers. The 2nd call sets the Timer Mode register accurately but clears the Configuration register.

Hope this helps.

Elizabeth

0 Vivek Singh over 7 years ago in reply to Elizabeth Joy

TI__Guru** 109535 points

Hi, Let us know if you any further queries on this.

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Concerto M3-Side PWM Problem