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Update tone.cpp 

- make tone() blocking for the input duration time
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stevstrong 2017-11-01 15:24:04 +01:00 committed by GitHub
parent 44d5894c3d
commit e14c83fe8d
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1 changed files with 4 additions and 3 deletions
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7
STM32F1/cores/maple/tone.cpp
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@ -60,7 +60,7 @@ uint8_t tone_ntimer = TONE_TIMER; // timer used to generate freque
bool tone_state = true; // last pin state for toggling
short tone_pin = -1; // pin for outputting sound
short tone_freq = 444; // tone frequency (0=pause)
uint32_t tone_nhw = 0; // tone duration in number of half waves
volatile uint32_t tone_nhw = 0; // tone duration in number of half waves
uint16_t tone_tcount = 0; // time between handler calls in 1/36 usec
uint16_t tone_ncount = 0; // handler call between toggling
uint16_t tone_n = 0; // remaining handler calls before toggling
@ -146,12 +146,12 @@ void tone(uint32_t pin, uint32_t freq, uint32_t duration) {
tone_timer->pause();
if(freq > 0 && duration >0 ){
if(freq > 0){
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
tone_nhw = ((duration*(freq>0?freq:100))/1000)<<1;
tone_nhw = ((duration*freq)/1000)<<1;
else // no duration specified, continuous sound until noTone() called
tone_nhw = 0;
@ -186,6 +186,7 @@ void tone(uint32_t pin, uint32_t freq, uint32_t duration) {
pinMode(tone_pin, INPUT);
}
while(tone_nhw) ; // blocks till duration elapsed
}
////////////////////////////////////////////////////////////////////////////////