diff options
Diffstat (limited to 'quantum/audio.c')
| -rw-r--r-- | quantum/audio.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/quantum/audio.c b/quantum/audio.c index 5edcccdbe1..470dc8e0c7 100644 --- a/quantum/audio.c +++ b/quantum/audio.c @@ -12,6 +12,8 @@ #define PI 3.14159265 +#define CPU_PRESCALER 8 + // #define PWM_AUDIO #ifdef PWM_AUDIO @@ -244,12 +246,12 @@ ISR(TIMER3_COMPA_vect) { // ICR3 = (int)(((double)F_CPU) / frequency); // Set max to the period // OCR3A = (int)(((double)F_CPU) / frequency) >> 1; // Set compare to half the period voice_place %= voices; - if (place > (frequencies[voice_place] / 500)) { + if (place > (frequencies[voice_place] / 50)) { voice_place = (voice_place + 1) % voices; place = 0.0; } - ICR3 = (int)(((double)F_CPU) / frequencies[voice_place]); // Set max to the period - OCR3A = (int)(((double)F_CPU) / frequencies[voice_place]) >> 1 * duty_place; // Set compare to half the period + ICR3 = (int)(((double)F_CPU) / (frequencies[voice_place] * CPU_PRESCALER)); // Set max to the period + OCR3A = (int)(((double)F_CPU) / (frequencies[voice_place] * CPU_PRESCALER)) >> 1 * duty_place; // Set compare to half the period place++; // if (duty_counter > (frequencies[voice_place] / 500)) { // duty_place = (duty_place % 3) + 1; @@ -281,8 +283,8 @@ ISR(TIMER3_COMPA_vect) { place -= SINE_LENGTH; #else if (note_frequency > 0) { - ICR3 = (int)(((double)F_CPU) / note_frequency); // Set max to the period - OCR3A = (int)(((double)F_CPU) / note_frequency) >> 1; // Set compare to half the period + ICR3 = (int)(((double)F_CPU) / (note_frequency * CPU_PRESCALER)); // Set max to the period + OCR3A = (int)(((double)F_CPU) / (note_frequency * CPU_PRESCALER)) >> 1; // Set compare to half the period } else { ICR3 = 0; OCR3A = 0; |