bug found in core, wiring_digital.c, function turnOffPWM(uint8_t timer)

system · July 3, 2014, 4:26pm

Hi, I have posted the report and solution here:

github.com/arduino/Arduino

wiring_digital.c, function turnOffPWM(uint8_t timer) does not switch off properly

opened 04:23PM - 03 Jul 14 UTC

closed 09:06AM - 18 Sep 15 UTC

gonzoveliki

Component: Core Type: Bug Architecture: AVR

Attention: This BUG concerns only AVR based platforms, standard variant, and not… the new ARM based ones like DUE and Teensy. It is also doesn't affect Teensy 2.0 which is featuring AVR32U4 and is using different code for digital_wiring... As I menioned and described here: http://forum.arduino.cc/index.php?topic=252700.msg1789311 There is core bug in wiring_digital.c that has been there for a long time. All AVR platforms using "standard" arduino core are affected, It is obvious only with PWM mode on pin 5 on UNO, and whichever pin is attached with TIMER0B on other boards. Problem occurs only when a PWM is used once on that pin, and after that can't be switched back to a solid bi-level digital. digitalWrite, pinMode, analogWrite(5,0) or analogWrite(5,255) are not helping either. Solution is quite simple: in file "wiring_digital.c" search for "#if defined(TIMER0B) && defined(COM0B1)" and replace with "#if defined(TCCR0A) && defined(COM0B1)" That's all, regards, I am glad helping this solved. Regards

Hope it will be accepted and fixed,

Regards

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bug found in core, wiring_digital.c, function turnOffPWM(uint8_t timer)

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