Hi Ilias, it's defined in the CMSIS header and it has the value '2':
https://github.com/RIOT-OS/RIOT/blob/2c02520f73efd0b24b535f79414e43a0aa3f3553/cpu/sam0_common/include/cmsis/samr21/include/component/tcc.h#L1312 . There is no further documentation about this single implementation. I guess you've already found the API description?! https://riot-os.org/api/group__drivers__periph__pwm.html In general we try to keep drivers as simple and efficient as possible. If you plan to implement and contribute code it might be worth to ask around if this kind of feature makes sense, before opening a PR that does not gain attraction. What is the problem with GitHub? If you need help getting started with git and you don't know how to contribute code, you can find help by searching 'git' and 'Development procedures' in our wiki. Best regards Peter Am 23.01.2017 um 12:15 schrieb Ilias Seitanidis: > Hi Peter, > Thank you very much for your reply, unfortunatelly I have some problems > with github and cannot create pr. > In my implementation of ([1],i) I use a parameter for the wave type, in the > Atmel documentation, the value for a normal wave is 2, > however I wasn't able to find in RIOT where the #define > TCC_WAVE_WAVEGEN_NPWM expresion for this parameter is, in order to validate > the value. The idea is to implement as many features as possible on the > pwm.c. Do you know any source of documentation for this driver Thank you > for your understanding :) > > Best, > Ilias > > [1]https://github.com/RIOT-OS/RIOT/blob/master/cpu/samd21/periph/pwm.c#L139 > [i] /* select the waveform generation mode -> normal PWM, wave is an int > variable*/ > _tcc(dev)->WAVE.reg = wave; > > 2017-01-23 8:53 GMT+01:00 Peter Kietzmann <peter.kietzm...@haw-hamburg.de>: > >> Hi Ilias, >> >> the periph_conf.h file should be the only one that you need to adapt. I >> didn't look it up but it might be that you need to make use of different >> PWM devices (TCC0 and TCC1) if you different periods and stuff. There is >> no need to adopt the loop in the driver. If you only want one channel >> per device, you can use this macro >> >> https://github.com/RIOT-OS/RIOT/blob/master/boards/ >> samr21-xpro/include/periph_conf.h#L140 >> >> and simply define one channel. Looking at the driver shows that >> TCC_WAVE_WAVEGEN_NPWM is not configurable: >> >> https://github.com/RIOT-OS/RIOT/blob/master/cpu/samd21/periph/pwm.c#L139 . >> >> Until now the "normal PWM mode" did suffice our needs. If you want that >> feature you should open a PR for that. >> >> Best >> Peter >> >> >> Am 20.01.2017 um 19:08 schrieb Ilias Seitanidis: >>> Dear all, >>> >>> I am trying to understand Riot by porting examples from Atmel >> Studio(SAMR21 >>> board) to Riot( hopefully when I finish it I will upload it as a full >>> example of Riot with threads, GPIOs, PWM, GNRC and what ever will come up >>> on the way). Currently, I am trying to produce a waveform in an >> oscilosope, >>> I read the [1], [2], [3]. However, I would like to use only pins PA18, >>> PA19, BUT for each pin to set different period, waveform generation mode. >>> The first step I suppose is to define as TCC0 and TCC1 the pin PA18 and >>> PA19 only respectively[3]? or just use it as it is and in [2] instead of >>> having a loop for each channel, to write seperately the configuration for >>> it? I will need every possible help( i.e. where can I find the >>> TCC_WAVE_WAVEGEN_NPWM >>> value). >>> Thank you in advance! >>> >>> Best regards, >>> Ilias >>> >>> [1] https://github.com/RIOT-OS/RIOT/blob/master/tests/periph_pwm/main.c >>> [2] https://github.com/RIOT-OS/RIOT/blob/master/cpu/samd21/periph/pwm.c >>> [3] >>> https://github.com/RIOT-OS/RIOT/blob/master/boards/ >> samr21-xpro/include/periph_conf.h >>> >>> >>> >>> _______________________________________________ >>> devel mailing list >>> devel@riot-os.org >>> https://lists.riot-os.org/mailman/listinfo/devel >>> >> >> -- >> Peter Kietzmann >> >> Hamburg University of Applied Sciences >> Dept. Informatik, Internet Technologies Group >> Berliner Tor 7, 20099 Hamburg, Germany >> Fon: +49-40-42875-8426 >> Web: http://www.haw-hamburg.de/inet >> _______________________________________________ >> devel mailing list >> devel@riot-os.org >> https://lists.riot-os.org/mailman/listinfo/devel >> > > > > _______________________________________________ > devel mailing list > devel@riot-os.org > https://lists.riot-os.org/mailman/listinfo/devel > -- Peter Kietzmann Hamburg University of Applied Sciences Dept. Informatik, Internet Technologies Group Berliner Tor 7, 20099 Hamburg, Germany Fon: +49-40-42875-8426 Web: http://www.haw-hamburg.de/inet _______________________________________________ devel mailing list devel@riot-os.org https://lists.riot-os.org/mailman/listinfo/devel
