add watch face for frequency correction and measurement

movement/make/Makefile

@@ -67,7 +67,7 @@ SRCS += \
   ../watch_faces/complication/tomato_face.c \
   ../watch_faces/complication/probability_face.c \
   ../watch_faces/complication/wake_face.c \
-# wake_face.c: Josh Berson, 2022-07-04
+  ../watch_faces/demo/frequency_correction_face.c \
 # New watch faces go above this line.
 
 # Leave this line at the bottom of the file; it has all the targets for making your project.

movement/movement_config.h

@@ -28,13 +28,7 @@
 #include "movement_faces.h"
 
 const watch_face_t watch_faces[] = {
-    simple_clock_face,
-    world_clock_face,
-    sunrise_sunset_face,
-    moon_phase_face,
-    thermistor_readout_face,
-    preferences_face,
-    set_time_face,
+    frequency_correction_face,
 };
 
 #define MOVEMENT_NUM_FACES (sizeof(watch_faces) / sizeof(watch_face_t))

movement/movement_faces.h

@@ -54,7 +54,7 @@
 #include "tomato_face.h"
 #include "probability_face.h"
 #include "wake_face.h"
-// #include "interval_face.h"
+#include "frequency_correction_face.h"
 // New includes go above this line.
 
 #endif // MOVEMENT_FACES_H_

movement/watch_faces/demo/frequency_correction_face.c

@@ -0,0 +1,142 @@
+/*
+ * 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();
+}
+
+#endif

movement/watch_faces/demo/frequency_correction_face.h

@@ -0,0 +1,48 @@
+/*
+ * 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.
+ */
+
+#ifndef FREQUENCY_CORRECTION_FACE_H_
+#define FREQUENCY_CORRECTION_FACE_H_
+
+#include "movement.h"
+
+typedef struct {
+    uint8_t period_event_output;
+} frequency_correction_state_t;
+
+void frequency_correction_face_setup(movement_settings_t *settings, uint8_t watch_face_index, void ** context_ptr);
+void frequency_correction_face_activate(movement_settings_t *settings, void *context);
+bool frequency_correction_face_loop(movement_event_t event, movement_settings_t *settings, void *context);
+void frequency_correction_face_resign(movement_settings_t *settings, void *context);
+
+#define frequency_correction_face ((const watch_face_t){ \
+    frequency_correction_face_setup, \
+    frequency_correction_face_activate, \
+    frequency_correction_face_loop, \
+    frequency_correction_face_resign, \
+    NULL, \
+})
+
+#endif // FREQUENCY_CORRECTION_FACE_H_
+