nrf51422a led intensity control

RE: nrf51422a led intensity control

Stefan Birnir Sverrisson — Fri, 21 Aug 2015 10:03:45 GMT

Hi mohamed

Can you perhaps provide a code snippet to show us what you have tried. Then we can figure out what is wrong and make further suggestions

RE: nrf51422a led intensity control

Mohamed O.Abouzeid — Tue, 18 Aug 2015 11:10:04 GMT

it played the patterns before the ble start advertising but after ble advertisied & connected to the mobile when I try to play the pattern, it stopped working and the pattern is hanged, I lost the connection also

RE: nrf51422a led intensity control

Mohamed O.Abouzeid — Tue, 18 Aug 2015 10:48:26 GMT

okay I'll try it again right now and show you the code I'm developing & the results

RE: nrf51422a led intensity control

Krzysztof Chruscinski — Tue, 18 Aug 2015 10:20:36 GMT

Hi, the goal of sdk drivers was to work with and without softdevice. app_pwm is using nrf_drv_timer and nrf_drv_ppi underneath which works the same with and without softdevice (ppi has less channels, you cannot use timer0 instance). To make app_pwm work with softdevice you need to use it with TIMER1 or TIMER2 instance. It is the second argument of APP_PWM_INSTANCE(name, num) macro. Timer instance must be enabled in nrf_drv_config.h before it can be used. If you check pwm example it is already using TIMER1 instance so if you merge this code with one of ble examples it should work.

RE: nrf51422a led intensity control

Mohamed O.Abouzeid — Tue, 18 Aug 2015 10:04:57 GMT

the main problem is that the softdevice reserve some resources like timers & the pwm need to use these resources, how to manage on that?

I tried to put the pwm functions before the softdevice (ble stack init) and after it but no gain is this a sample code showing me how to use it ? ?

RE: nrf51422a led intensity control

Krzysztof Chruscinski — Tue, 18 Aug 2015 09:08:40 GMT

Hi, yes it is in SDK and works with softdevice. Try to initialize softdevice and then call app_pwm_init.

RE: nrf51422a led intensity control

Mohamed O.Abouzeid — Tue, 18 Aug 2015 09:01:55 GMT

where to find the app_pwm ? ? I tried the app_pwm from SDK and it didn't work with softdevice is there a method to make it work with softdevice

RE: nrf51422a led intensity control

Krzysztof Chruscinski — Tue, 18 Aug 2015 05:25:37 GMT

Hi,

have you tried PWM (app_pwm) from SDK? It's working fine with SoftDevice. Another thing that you could try is to use app_timer to create software-controlled low power, low frequency PWM. It's not precise because of other interrupts (mainly softdevice) but might be good enough for LED intensity changing. BTW you will find such module in upcoming SDK.