PWM on 3 pins

RE: PWM on 3 pins

bojerko — Thu, 03 Aug 2017 14:49:33 GMT

On BLE_Characteristic and yes. The buttons setup was a problem for 17 - 20 not working. I resolved that. And the other problem was that I was setting the pwm in ble_write. I moved the setup code to our_char_add function and it works now.

Thanks :)

RE: PWM on 3 pins

Sigurd — Thu, 03 Aug 2017 14:42:10 GMT

What example did you base your code on? Note that pin 17-20 is used for the buttons on the nRF51-DK (PCA10028), so many examples will configure these pins for the buttons. If you are working on the nRF51-Dongle, it is important to set the BOARD_PCA10031 in the pre-processor symbol list, and remove the BOARD_PCA10028 define.

RE: PWM on 3 pins

bojerko — Thu, 03 Aug 2017 13:52:43 GMT

OK. Thanks. I'll check it. I'm working on mac, so no error handling :/

RE: PWM on 3 pins

Sigurd — Thu, 03 Aug 2017 13:27:50 GMT

You can use up-to 4 PWM channels together with the SoftDevice(BLE) without problems. There is also an full example of this in this post.

Are you running into the error handler when you enable both PWM1 and PWM2 ? See this post about debugging.

RE: PWM on 3 pins

bojerko — Thu, 03 Aug 2017 12:30:14 GMT

I wonder if the reason that I use the procedure in BLE is a reason for PWM2 and PWM1 not working together. If I use only PWM2 and comment out PWM1 it works and vice versa.

RE: PWM on 3 pins

bojerko — Thu, 03 Aug 2017 12:07:47 GMT

Ah yes ... for some strange reasons I have two nrf_drv_config.h files and in one the setup was proper, but in the other not. So it compiles, but the LED on the pin with PWM2 still doesn't light on. If I move it to PWM1 it turns on. Looks like I'm still missing something in setting :(

RE: PWM on 3 pins

Sigurd — Thu, 03 Aug 2017 11:17:38 GMT

Yes, you need to make sure that you have #define TIMER2_ENABLED 1 in nrf_drv_config.h

RE: PWM on 3 pins

bojerko — Thu, 03 Aug 2017 11:14:02 GMT

I just copied APP_PWM_INSTANCE(PWM1,1); and changed PWM1 to PWM2. Now I change the 1 to 2, but get the error: error: 'TIMER2_INSTANCE_INDEX' undeclared here (not in a function)

I guess I need to setup something in nrf_drv_config.h although both timers are on (1 and 2). Do you have an idea what might be solution to that? Thanks.

RE: PWM on 3 pins

Sigurd — Thu, 03 Aug 2017 11:05:49 GMT

Are you using TIMER2 for the PWM2 instance? i.e.:

APP_PWM_INSTANCE(PWM2,2);

RE: PWM on 3 pins

bojerko — Thu, 03 Aug 2017 09:44:38 GMT

Ah, yes. I missed this one. Thanks for that. At least 15 and 16 are now on, but 17 is still off :/

RE: PWM on 3 pins

Sigurd — Thu, 03 Aug 2017 09:39:51 GMT

Hi,

It looks like you are initializing the first PWM instance twice. I.e. you should change your line

err_code = app_pwm_init(&PWM1,&pwm3_cfg,pwm_ready_callback3);

err_code = app_pwm_init(&PWM2,&pwm3_cfg,pwm_ready_callback3);