void button_callback_timer_isr(button_t *button_table, uint8_t num_of_btns,
void *dest_queue) {
sampling_time_count = sampling_time_count + 1;
if (sampling_time_count == BTN_SAMPLING_PERIOD) {
sampling_time_count = 0;
uint8_t i = 0;
for (i = 0; i < num_of_btns; i++) {
button_processing(&button_table[i]);
if (is_changed_status(&button_table[i])) {
if (!dest_queue || !(&button_table[i].enable_btn_evt)
|| !enable_all_btn_evts) {
return;
}
_mqx_uint msg =
(_mqx_uint) (((uint32_t) button_table[i].dev_id
<< BTN_NUM_BITS_IN_VALUE)| (uint16_t) get_button_status(&button_table[i]));
_lwmsgq_send((pointer) dest_queue, &msg, 0);
} else {
if (button_table[i].current_status == btn_on_hold) {
button_hold_processing(&button_table[i], dest_queue);
}
}
} //end for()
} //end if()
}
static void button_hold_processing(button_t *a_button, void *dest_queue) {
button_hold_time_count++;
if (button_hold_time_count == BTN_HOLD_PERIOD) {
button_hold_time_count = 0;
a_button->old_status = btn_no_pressed;
if (!dest_queue || !(a_button->enable_btn_evt)
|| !enable_all_btn_evts) {
return;
}
_mqx_uint msg = (_mqx_uint) (((uint32_t) a_button->dev_id
<< BTN_NUM_BITS_IN_VALUE)
| (uint16_t) get_button_status(a_button));
_lwmsgq_send((pointer) dest_queue, &msg, 0);
}
}
void loop()
{
uint8_t new_status;
uint8_t tmp;
uint8_t tmp_pitch_bit;
//
// the loop updates the sound parameters
//
// since we don't want all the parameters updated when playing,
// some parameters are updated only on silence and on sustain,
// and others are updated only on silence
//
// envelopes are updated only on silence and sustain
if ((g_env_stage != 0) && (g_env_stage != 2)) {
g_env_lengths[0] = analogRead(ATTACK_CTRL) * 16;
g_env_lengths[1] = analogRead(RELEASE_CTRL) * 16;
g_env_type =
(digitalRead(LOWPASS_PIN) == LOW) ? 1 :
((digitalRead(FREQ_PIN) == LOW) ? 2 : 0);
}
// vibrato and resonance are always welcome
tmp = (uint8_t)(analogRead(VIBRATO_CTRL) / 4);
g_vib_strength = (tmp > 20) ? tmp : 0;
tmp = analogRead(RESONANCE_CTRL) / 4;
g_lpf_resonance = (tmp > 20) ? tmp : 0;
// so are tremolo and distortion
g_trem_status = digitalRead(TREM_PIN)==LOW ? 1 : 0;
g_dist_status = digitalRead(DIST_PIN)==LOW ? 1 : 0;
//
// pitch buttons
//
new_status = get_button_status();
// is the current pitch released?
if ((g_env_stage < 2) && ((g_current_pitch_bit & new_status) == 0)) {
g_env_stage = 2;
}
// are all buttons released?
if (new_status == 0) {
g_current_pitch_bit = 0x00;
}
// or is a different pitch selected?
else if (new_status != g_button_status) {
tmp_pitch_bit = g_current_pitch_bit;
// if a new button is pressed - select it
if (new_status & (~g_button_status)) {
tmp_pitch_bit = new_status & (~g_button_status);
}
// or if the current pitch is released - select another
else if ((new_status & (~g_current_pitch_bit)) == 0) {
tmp_pitch_bit = new_status;
}
// select only one pitch
tmp_pitch_bit &= (~(tmp_pitch_bit-1));
// if it's really a different pitch, play it
if (tmp_pitch_bit != g_current_pitch_bit) {
g_current_pitch_bit = tmp_pitch_bit;
// change the pitch with interrupts disabled
cli();
g_base_freq = get_base_freq(g_current_pitch_bit);
reset_sample();
g_env_stage = 0;
sei();
}
}
g_button_status = new_status;
}
