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Fixed tone() so it works is F_CPU is not 72Mhz

This commit is contained in:
Roger Clark 2017-01-09 21:17:28 +11:00
parent 7dcbbc85b0
commit c2f4aa8566
1 changed files with 1 additions and 1 deletions
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2
STM32F1/cores/maple/tone.cpp
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@ -147,7 +147,7 @@ void tone(uint32_t pin, uint32_t freq, uint32_t duration) {
tone_timer->pause();
if(freq > 0 && duration >0 ){
uint32_t count = 18000000/freq; // timer counts per half wave
uint32_t count = (F_CPU/4)/freq; // timer counts per half wave
tone_ncount = tone_n = (count>>16)+1; // number of 16-bit count chunk
tone_tcount = count/tone_ncount; // size of count chunk
if(duration > 0) // number of half waves to be generated