Hi, The project to create 'day' and 'night' at the Wimborne Model Town Railway is progressing very nicely, with only one or two snags to be ironed out.
One snag is that the LED Strips flicker a little. It's not a major issue, except that any flickering isn't allowed in a public place (epilepsy), so I need to sort it out. So far, I've been using the RPi.GPIO library to create PWM under Raspbian and then copying the compiled (.pyc) file to the deployed image running PiCore. Unfortunately, RPi.GPIO doesn't support the Broadcom hardware PWM pin yet. So today, I've successfully used wiringpi2, running under Raspbian, to create PWM in hardware which seems to be flicker-free (see http://raspi.tv/2013/how-to-use-wiringpi2-for-python-with-pull-ups-or-pull-downs-and-pwm ). However, the PiCore extension for wiringpi is still the original and doesn't actually work with modern Pi hardware. I then looked into building wiringpi2 from source (see https://projects.drogon.net/raspberry-pi/wiringpi/download-and-install/ (Plan B)). In PiCore, I believe that I have installed all of the make / gcc PiCore extensions that are available, but I get the following result:. (I do intend to ask the PiCore crowd this question too.) tc@box:~/wiringPi-78b5c32$ ./build wiringPi Build script ===================== WiringPi Library [UnInstall] [Compile] wiringPi.c [Compile] wiringSerial.c [Compile] wiringShift.c [Compile] piHiPri.c [Compile] piThread.c gcc: error trying to exec 'as': execvp: No such file or directory gcc: error trying to exec 'as': execvp: No such file or directory gcc: error trying to exec 'as': execvp: No such file or directory gcc: error trying to exec 'as': execvp: No such file or directory gcc: error trying to exec 'as': execvp: No such file or directory In file included from /tmp/tcloop/gcc/usr/lib/gcc/armv7l-unknown-linux- gnueabihf/5.3.0/include/stdint.h:9:0, from wiringShift.c:25: /usr/lib/gcc/armv7l-unknown-linux-gnueabihf/5.3.0/include/stdint.h:9:26: fatal error: stdint.h: No such file or directory compilation terminated. Makefile:95: recipe for target 'wiringShift.o' failed make: *** [wiringShift.o] Error 2 make: *** Waiting for unfinished jobs.... wiringSerial.c:23:19: fatal error: stdio.h: No such file or directory compilation terminated. Makefile:95: recipe for target 'wiringSerial.o' failed make: *** [wiringSerial.o] Error 2 piThread.c:26:21: fatal error: pthread.h: No such file or directory compilation terminated. wiringPi.c:55:19: fatal error: stdio.h: No such file or directory compilation terminated. Makefile:95: recipe for target 'piThread.o' failed make: *** [piThread.o] Error 2 Makefile:95: recipe for target 'wiringPi.o' failed make: *** [wiringPi.o] Error 2 piHiPri.c:27:19: fatal error: sched.h: No such file or directory compilation terminated. Makefile:95: recipe for target 'piHiPri.o' failed make: *** [piHiPri.o] Error 2 -- Terry Coles -- Next meeting: Bournemouth, Tuesday, 2016-03-01 20:00 Meets, Mailing list, IRC, LinkedIn, ... http://dorset.lug.org.uk/ New thread: mailto:dorset@mailman.lug.org.uk / CHECK IF YOU'RE REPLYING Reporting bugs well: http://goo.gl/4Xue / TO THE LIST OR THE AUTHOR
