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/*
* MIT License
*
* Copyright (c) 2022 <#author_name#>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <stdlib.h>
#include <string.h>
#include "frequency_correction_face.h"
// NOTE: since this face deals directly with the SAM L22's SUPC and RTC registers,
// it won't build for the simulator or really do anything. so let's not.
#ifndef __EMSCRIPTEN__
// Waveform output. Comes out on pin A1 of the 9-pin connector. Output is enabled
// when the watch face is activated and disabled when deactivated.
// * The RTC's PEREOn enables an event at a frequency of 1024/(2^(n+3)), allowing
// event generation from 128 Hz to 1 Hz.
// * The SUPC's RTCTGL causes the selected output to toggle on an RTC event.
// Putting it together, PEREO0 generates a 64 Hz square wave on A1, PEREO1 a 32 Hz
// wave, on and on to an 0.5 Hz square wave for PEREO7.
static void _enable_output(uint8_t period_event_output) {
SUPC->BKOUT.bit.EN = 1;
SUPC->BKOUT.bit.RTCTGL = 1;
RTC->MODE2.CTRLA.bit.ENABLE = 0;
while (RTC->MODE2.SYNCBUSY.bit.ENABLE);
RTC->MODE2.EVCTRL.reg = RTC_MODE2_EVCTRL_PEREO(1 << period_event_output);
RTC->MODE2.CTRLA.bit.ENABLE = 1;
while (RTC->MODE2.SYNCBUSY.bit.ENABLE);
}
// The display: "FC" for "Frequency Correction" in the title slot; at the top right,
// the periodic event output that's enabled:: 0 for PEREO0, 1 for PEREO1, etc.
// The main line displays the frequency correction value from -127 to 127.
// Controls: A short press on the Light button increases FREQCORR by 1 and a short
// press on the Alarm button decreases FREQCORR by 1. A long press on ALARM cycles
// through the available output frequencies.
static void _update_display(uint8_t period_event_output) {
char buf[14];
sprintf(buf, "FC%2d%6d", period_event_output, (int8_t)RTC->MODE2.FREQCORR.reg);
watch_display_string(buf, 0);
}
static void _disable_output() {
SUPC->BKOUT.bit.EN = 0;
SUPC->BKOUT.bit.RTCTGL = 0;
RTC->MODE2.CTRLA.bit.ENABLE = 0;
while (RTC->MODE2.SYNCBUSY.bit.ENABLE);
RTC->MODE2.EVCTRL.reg = RTC_MODE2_EVCTRL_PEREO(0);
RTC->MODE2.CTRLA.bit.ENABLE = 1;
while (RTC->MODE2.SYNCBUSY.bit.ENABLE);
}
void frequency_correction_face_setup(movement_settings_t *settings, uint8_t watch_face_index, void ** context_ptr) {
(void) settings;
(void) watch_face_index;
if (*context_ptr == NULL) {
*context_ptr = malloc(sizeof(frequency_correction_state_t));
frequency_correction_state_t *state = (frequency_correction_state_t *)*context_ptr;
state->period_event_output = 0;
}
}
void frequency_correction_face_activate(movement_settings_t *settings, void *context) {
(void) settings;
frequency_correction_state_t *state = (frequency_correction_state_t *)context;
_enable_output(state->period_event_output);
}
bool frequency_correction_face_loop(movement_event_t event, movement_settings_t *settings, void *context) {
(void) settings;
frequency_correction_state_t *state = (frequency_correction_state_t *)context;
int8_t freqcorr;
switch (event.event_type) {
case EVENT_ACTIVATE:
_update_display(state->period_event_output);
break;
case EVENT_TICK:
break;
case EVENT_MODE_BUTTON_UP:
movement_move_to_next_face();
break;
case EVENT_LIGHT_BUTTON_UP:
freqcorr = RTC->MODE2.FREQCORR.reg;
if (freqcorr < 127) {
RTC->MODE2.FREQCORR.reg++;
while(RTC->MODE2.SYNCBUSY.reg);
}
_update_display(state->period_event_output);
break;
case EVENT_ALARM_BUTTON_UP:
freqcorr = RTC->MODE2.FREQCORR.reg;
if (freqcorr > -127) {
RTC->MODE2.FREQCORR.reg--;
while(RTC->MODE2.SYNCBUSY.reg);
}
_update_display(state->period_event_output);
break;
case EVENT_ALARM_LONG_PRESS:
state->period_event_output = (state->period_event_output + 1) % 8;
_update_display(state->period_event_output);
_enable_output(state->period_event_output);
break;
case EVENT_TIMEOUT:
break;
case EVENT_LOW_ENERGY_UPDATE:
watch_start_tick_animation(500);
break;
default:
break;
}
return true;
}
void frequency_correction_face_resign(movement_settings_t *settings, void *context) {
(void) settings;
(void) context;
_disable_output();
}
#else
void frequency_correction_face_setup(movement_settings_t *settings, uint8_t watch_face_index, void ** context_ptr) {
(void) settings;
(void) watch_face_index;
(void) context_ptr;
}
void frequency_correction_face_activate(movement_settings_t *settings, void *context) {
(void) settings;
(void) context;
}
bool frequency_correction_face_loop(movement_event_t event, movement_settings_t *settings, void *context) {
(void) settings;
(void) context;
(void) event;
return true;
}
void frequency_correction_face_resign(movement_settings_t *settings, void *context) {
(void) settings;
(void) context;
}
#endif
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