LM4F232H5QD: problem with build in PWM.

Jerzy Lasyk

Hello, i'm trying to run four Pwm signals, two from generator1 (PH0 and PH1), another two form generator2 (PH2 and PH3).

First two signals are generated properly, but another two not. I was trying everything. I would be very grateful if you could help me.

SysCtlPWMClockSet(SYSCTL_PWMDIV_1);

SysCtlPeripheralEnable(SYSCTL_PERIPH_PWM);

SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOH);

GPIOPinConfigure(GPIO_PH0_M0PWM0);
GPIOPinConfigure(GPIO_PH1_M0PWM1);
GPIOPinConfigure(GPIO_PH2_M0PWM2);
GPIOPinConfigure(GPIO_PH3_M0PWM3);

GPIOPinTypePWM(GPIO_PORTH_BASE, GPIO_PIN_0);
GPIOPinTypePWM(GPIO_PORTH_BASE, GPIO_PIN_1);
GPIOPinTypePWM(GPIO_PORTH_BASE, GPIO_PIN_2);
GPIOPinTypePWM(GPIO_PORTH_BASE, GPIO_PIN_3);

//
// konfigurujemy PWMa
//
PWMGenConfigure(PWM_BASE, PWM_GEN_0, PWM_GEN_MODE_UP_DOWN |
PWM_GEN_MODE_NO_SYNC);
PWMGenConfigure(PWM_BASE, PWM_GEN_1, PWM_GEN_MODE_UP_DOWN |
PWM_GEN_MODE_NO_SYNC);

PWMGenPeriodSet(PWM_BASE, PWM_GEN_0, 50000/10);
PWMGenPeriodSet(PWM_BASE, PWM_GEN_1, 50000/10);

PWMPulseWidthSet(PWM_BASE, PWM_OUT_0, PWMGenPeriodGet(PWM_BASE, PWM_OUT_0)/ 4);
PWMPulseWidthSet(PWM_BASE, PWM_OUT_2, PWMGenPeriodGet(PWM_BASE, PWM_OUT_2)/ 4);

PWMDeadBandEnable(PWM_BASE, PWM_GEN_0, 160, 160);
PWMDeadBandEnable(PWM_BASE, PWM_GEN_1, 160, 160);

PWMOutputState(PWM_BASE, PWM_OUT_0_BIT | PWM_OUT_1_BIT, true);
PWMOutputState(PWM_BASE, PWM_OUT_2_BIT | PWM_OUT_3_BIT, true);

PWMGenEnable(PWM_BASE, PWM_GEN_0);
PWMGenEnable(PWM_BASE, PWM_GEN_1);

over 13 years ago

0 Lela Garofolo over 13 years ago

TI__Mastermind 18905 points

Hi Jerzy,

I am going through a set-up to duplicate and fix, I will follow up shortly.

Lela

0 Satheesh Ramasamy over 12 years ago in reply to Lela Garofolo

Prodigy 70 points

Hello ,

I am not able to generate even with this example could you please help me generate PWM signal.

0 Lela Garofolo over 12 years ago in reply to Satheesh Ramasamy

TI__Mastermind 18905 points

Satheesh,

Can you tell me what evaluation board (if custom board part number)? I will send you working code that you can cut and paste for your specific device.

Lela

0 Satheesh Ramasamy over 12 years ago in reply to Lela Garofolo

Prodigy 70 points

Stellaris® LM4F232 Evaluation Kit for Keil™ RealView® MDK-ARM (32 KB code-size limited)

In addition to that please also let me know how mto calculate argument value to confgure port using GPIOPinConfigure() function

0 Lela Garofolo over 12 years ago in reply to Satheesh Ramasamy

TI__Mastermind 18905 points

Hi Satheesh,

Add the following code section to your project:

SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_PLL | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ);
SysCtlPWMClockSet(SYSCTL_PWMDIV_1);

SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOD);
GPIOPinConfigure(GPIO_PD0_M0PWM6);
GPIOPinTypePWM(GPIO_PORTD_BASE, GPIO_PIN_0);

SysCtlPeripheralEnable(SYSCTL_PERIPH_PWM0);
PWMGenConfigure(PWM0_BASE, PWM_GEN_3, PWM_GEN_MODE_UP_DOWN | PWM_GEN_MODE_NO_SYNC);
PWMGenPeriodSet(PWM0_BASE, PWM_GEN_3, 64000);
PWMPulseWidthSet(PWM0_BASE, PWM_OUT_6,64000 / 4);
PWMOutputState(PWM0_BASE, PWM_OUT_6_BIT, true);
PWMGenEnable(PWM0_BASE, PWM_GEN_3);

Measure PD0 with an oscilloscope probe, and you will see the PWM output.

Lela

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LM4F232H5QD: problem with build in PWM.