PROBLEM WITH PWM output

sushil kumar singh

Prodigy 250 points

Other Parts Discussed in Thread: TM4C123GH6PM, ENERGIA

hi.. i want 25% duty from 50KHz frequency.

1.why it is raising an error "GPIO_PF1_M1PWM5" undeclared(first use in this fuction)???

2. what SysCtlPWMClockSet(SYSCTL_PWMDIV_16) means??

#include "inc/hw_ints.h"

#include "inc/hw_memmap.h"

#include "inc/hw_types.h"
#include "driverlib/sysctl.h"
#include "driverlib/interrupt.h"
#include "driverlib/gpio.h"
#include "driverlib/timer.h"
#include "driverlib/pwm.c"
#include "driverlib/pwm.h"

int main(void)

{

SysCtlClockSet(SYSCTL_SYSDIV_1 | SYSCTL_USE_OSC | SYSCTL_OSC_MAIN | SYSCTL_XTAL_16MHZ);

SysCtlPWMClockSet(SYSCTL_PWMDIV_16);

SysCtlPeripheralEnable(SYSCTL_PERIPH_PWM1);

SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);
GPIOPinTypePWM(GPIO_PORTF_BASE, GPIO_PIN_1);
GPIOPinConfigure(GPIO_PF1_M1PWM5);
GPIOPinWrite(GPIO_PORTF_BASE,GPIO_PIN_1,GPIO_PIN_1);

PWMGenConfigure(PWM1_BASE, PWM_GEN_2, PWM_GEN_MODE_DOWN|PWM_GEN_MODE_NO_SYNC);
PWMGenPeriodSet(PWM1_BASE, PWM_GEN_2, 320);

PWMPulseWidthSet(PWM1_BASE, PWM_OUT_5,80);

PWMOutputState(PWM1_BASE, PWM_OUT_5_BIT, true);

PWMGenEnable(PWM1_BASE, PWM_GEN_2);

}

over 11 years ago

0 Markel Robregado over 11 years ago

Guru 86865 points

Hi,

Are you using Tiva Kit?

edited . . .

sushil kumar singh said:

SysCtlPeripheralEnable(SYSCTL_PERIPH_PWM1);

SysCtlPeripheralEnable(SYSCTL_PERIPH_GPIOF);
GPIOPinTypePWM(GPIO_PORTF_BASE, GPIO_PIN_1);
GPIOPinConfigure(GPIO_PF1_M1PWM5);

You should be enabling clock for PWM5 instead of PWM1.

- kel

0 sushil kumar singh over 11 years ago in reply to Markel Robregado

Prodigy 250 points

Yes sir im using TIVA TM4C123GXL

but sir i guess it can only allow 2 PWM modules to use...

So in my case how i can use PWM5???

0 Markel Robregado over 11 years ago in reply to sushil kumar singh

Guru 86865 points

sushil kumar singh said:
but sir i guess it can only allow 2 PWM modules to use...

I have checked and you are correct. Mistake on my part. I will review your code again when I have more time.

- kel

0 sushil kumar singh over 11 years ago in reply to Markel Robregado

Prodigy 250 points

no issues sir...

but sir plze reply ASAP..

0 Luis Afonso over 11 years ago in reply to Markel Robregado

Guru 20670 points

This is rong.

with SysCtlPeripheralEnable(SYSCTL_PERIPH_PWM1); he's enabling the PWM module 1

with GPIOPinConfigure(GPIO_PF1_M1PWM5); he's configuring PF1 to be a PWM output for output 5 of Module 1.

So that part is correct

SysCtlPWMClockSet(SYSCTL_PWMDIV_16) means the divisor for the PWM module clock. If your uControler is at 80Mhz it means the source clock for the PWM module is 80Mhz/16. This alows to achieve lower frequency PWM.

Try adding

#define PART_TM4C123GH6PM

Also, try removing GPIOPinWrite(GPIO_PORTF_BASE,GPIO_PIN_1,GPIO_PIN_1);

0 sushil kumar singh over 11 years ago in reply to Luis Afonso

Prodigy 250 points

Hi..

after removing GPIOPinWrite(GPIO_PORTF_BASE,GPIO_PIN_1,GPIO_PIN_1); and adding #define PART_TM4C123GH6PM still the same problem....

still not working sirr....what should i do more

0 Luis Afonso over 11 years ago in reply to sushil kumar singh

Guru 20670 points

can you please copy here wich errors your getting?

0 sushil kumar singh over 11 years ago in reply to Luis Afonso

Prodigy 250 points

0 Luis Afonso over 11 years ago in reply to sushil kumar singh

Guru 20670 points

I actualy had a similar error with CCS.

I realy have problems with the includes in CCS that's why i first use Energia Compiler then port it to CCS. But i program with TivaWare API

Try to remove #include "driverlib/pwm.c". Gona see if i can replicate the problem and solve it. Can you upload your project zip?

0 sushil kumar singh over 11 years ago in reply to Luis Afonso

Prodigy 250 points

7217.PWM.zip

0 Luis Afonso over 11 years ago in reply to sushil kumar singh

Guru 20670 points

try putting the #define PART_TM4C123GH6PM on top of all includes.

The rest i can't help you much. I was never able to make 1 working code in CCS with Tiva. There's always symbols errors for me, even with all includes

Maybe someone more experience could help, even in the code composer studio forum part

0 Markel Robregado over 11 years ago in reply to sushil kumar singh

Guru 86865 points

Hi Sushil,

What version of Tivaware are you using? It is recommended to use the latest version.

- kel

0 Amit Ashara over 11 years ago in reply to Markel Robregado

TI__Guru**** 244440 points

Hello Sushil,

Attached is the CCS version of the same project you have on GCC. I am using CCS version 5.5 and TIVAWare version 2.1.0-12573

http://e2e.ti.com/cfs-file.ashx/__key/communityserver-discussions-components-files/908/2117.TM4C123_5F00_PWM.7z

I checked the output of the PWM PF1 signal and it generates a 3.13KHz, 25% DC PWM output on PF1

Regards

Amit

0 sushil kumar singh over 11 years ago in reply to Amit Ashara

Prodigy 250 points

Hello Amit sir...

Is the above code is working fine at ur place(CCS version). Actually I am using Eclipse instead of CCS and in that i found again the same errors which i was getting. Plze suggest me something....

0 Amit Ashara over 11 years ago in reply to sushil kumar singh

TI__Guru**** 244440 points

Hello Sushil,

You can copy the code from the TM4C123_PWM.c file and ensure that the defines PART_TM4C123GH6PM and TARGET_IS_TM4C123_RB1 are placed in the define options and not the code itself.

Regards

Amit