bring in battery voltage face, add new method and demo for displaying floats

watch-faces/sensor/voltage_face.c

@@ -0,0 +1,87 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2022 Joey Castillo
+ *
+ * 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 "voltage_face.h"
+#include "watch.h"
+
+static void _voltage_face_update_display(void) {
+    watch_enable_adc();
+    float voltage = (float)watch_get_vcc_voltage() / 1000.0;
+    watch_disable_adc();
+
+    watch_display_text_with_fallback(WATCH_POSITION_TOP_LEFT, "BAT", "BA");
+    watch_display_float_with_best_effort(voltage, " V");
+}
+
+void voltage_face_setup(uint8_t watch_face_index, void ** context_ptr) {
+    (void) watch_face_index;
+    (void) context_ptr;
+}
+
+void voltage_face_activate(void *context) {
+    (void) context;
+}
+
+bool voltage_face_loop(movement_event_t event, void *context) {
+    (void) context;
+    watch_date_time date_time;
+    switch (event.event_type) {
+        case EVENT_ACTIVATE:
+            _voltage_face_update_display();
+            break;
+        case EVENT_TICK:
+            date_time = watch_rtc_get_date_time();
+            if (date_time.unit.second % 5 == 4) {
+                watch_set_indicator(WATCH_INDICATOR_SIGNAL);
+            } else if (date_time.unit.second % 5 == 0) {
+                _voltage_face_update_display();
+                watch_clear_indicator(WATCH_INDICATOR_SIGNAL);
+            }
+            break;
+        case EVENT_LOW_ENERGY_UPDATE:
+            // clear seconds area (on classic LCD) and start tick animation if necessary
+            if (!watch_sleep_animation_is_running()) {
+                watch_display_text_with_fallback(WATCH_POSITION_SECONDS, " V", "  ");
+                watch_start_sleep_animation(1000);
+            }
+            // update once an hour
+            if (date_time.unit.minute == 0) {
+                watch_clear_indicator(WATCH_INDICATOR_SIGNAL);
+                _voltage_face_update_display();
+                watch_display_text_with_fallback(WATCH_POSITION_SECONDS, " V", "  ");
+            }
+            break;
+        default:
+            movement_default_loop_handler(event);
+            break;
+    }
+
+    return true;
+}
+
+void voltage_face_resign(void *context) {
+    (void) context;
+}

watch-faces/sensor/voltage_face.h

@@ -0,0 +1,54 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2022 Joey Castillo
+ *
+ * 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 VOLTAGE_FACE_H_
+#define VOLTAGE_FACE_H_
+
+/*
+ * VOLTAGE face
+ *
+ * This watch face is very simple and has no controls to speak of. It displays
+ * the battery voltage as measured by the SAM L22’s ADC.
+ *
+ * Note that the Simple Clock watch face includes a low battery warning, so you
+ * don’t technically need to this watch face unless you want to track the
+ * battery level.
+ */
+
+#include "movement.h"
+
+void voltage_face_setup(uint8_t watch_face_index, void ** context_ptr);
+void voltage_face_activate(void *context);
+bool voltage_face_loop(movement_event_t event, void *context);
+void voltage_face_resign(void *context);
+
+#define voltage_face ((const watch_face_t){ \
+    voltage_face_setup, \
+    voltage_face_activate, \
+    voltage_face_loop, \
+    voltage_face_resign, \
+    NULL, \
+})
+
+#endif // VOLTAGE_FACE_H_