panki/fz-metronome
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

code cleanup, fix timing offset due to delay

Browse Source
This commit is contained in:
Felix Pankratz 2022-09-18 16:10:11 +02:00
parent 5aaca73b8e
commit 664f8e7241
1 changed files with 44 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

53
metronome.c
View File

@ -5,7 +5,11 @@
#include <m-string.h>
#include <stdlib.h>
#define BPM_STEP_SIZE 0.5d
#define BPM_STEP_SIZE_FINE 0.5d
#define BPM_STEP_SIZE_COARSE 10.0d
#define BPM_BOUNDARY_LOW 10.0d
#define BPM_BOUNDARY_HIGH 300.0d
#define BEEP_DELAY_MS 50
typedef enum {
EventTypeTick,
@ -64,7 +68,7 @@ static void input_callback(InputEvent* input_event, FuriMessageQueue* event_queu
static void timer_callback() {
//UNUSED(metronome_state);
furi_hal_speaker_start(440.0f, 1.0f);
furi_delay_ms(40);
furi_delay_ms(BEEP_DELAY_MS);
furi_hal_speaker_stop();
}
@ -74,6 +78,39 @@ static void metronome_state_init(MetronomeState* const metronome_state) {
metronome_state->timer = furi_timer_alloc(timer_callback, FuriTimerTypePeriodic, metronome_state);
}
static uint32_t bpm_to_sleep_ticks(double bpm) {
// calculate time between beeps
uint32_t tps = furi_kernel_get_tick_frequency();
double bps = (double)bpm / 60;
return (uint32_t)round(tps / bps) - ((BEEP_DELAY_MS/1000)*tps);
}
static void update_timer(MetronomeState* metronome_state) {
if (furi_timer_is_running(metronome_state->timer)) {
furi_timer_stop(metronome_state->timer);
furi_timer_start(
metronome_state->timer,
bpm_to_sleep_ticks(metronome_state->bpm)
);
}
}
static void increase_bpm(MetronomeState* metronome_state, double amount) {
metronome_state->bpm += amount;
if(metronome_state->bpm > (double)BPM_BOUNDARY_HIGH) {
metronome_state->bpm = BPM_BOUNDARY_HIGH;
}
update_timer(metronome_state);
}
static void decrease_bpm(MetronomeState* metronome_state, double amount) {
metronome_state->bpm -= amount;
if(metronome_state->bpm < (double)BPM_BOUNDARY_LOW) {
metronome_state->bpm = BPM_BOUNDARY_LOW;
}
update_timer(metronome_state);
}
int32_t metronome_app() {
FuriMessageQueue* event_queue = furi_message_queue_alloc(8, sizeof(PluginEvent));
@ -108,23 +145,21 @@ int32_t metronome_app() {
if(event.input.type == InputTypePress) {
switch(event.input.key) {
case InputKeyUp:
increase_bpm(metronome_state, BPM_STEP_SIZE_COARSE);
break;
case InputKeyDown:
decrease_bpm(metronome_state, BPM_STEP_SIZE_COARSE);
break;
case InputKeyRight:
metronome_state->bpm += (double)BPM_STEP_SIZE;
increase_bpm(metronome_state, BPM_STEP_SIZE_FINE);
break;
case InputKeyLeft:
metronome_state->bpm -= (double)BPM_STEP_SIZE;
decrease_bpm(metronome_state, BPM_STEP_SIZE_FINE);
break;
case InputKeyOk:
metronome_state->playing = !metronome_state->playing;
if (metronome_state->playing) {
// calculate time between beeps
uint32_t tps = furi_kernel_get_tick_frequency();
double bps = (double)metronome_state->bpm / 60;
uint32_t ticks_to_sleep = (uint32_t)round(tps / bps);
furi_timer_start(metronome_state->timer, ticks_to_sleep);
furi_timer_start(metronome_state->timer, bpm_to_sleep_ticks(metronome_state->bpm));
} else {
furi_timer_stop(metronome_state->timer);
}