add watch face to peek at a memory location

movement_faces.h

@@ -51,4 +51,5 @@
 #include "finetune_face.h"
 #include "nanosec_face.h"
 #include "mars_time_face.h"
+#include "peek_memory_face.h"
 // New includes go above this line.

watch-faces.mk

@@ -14,6 +14,7 @@ SRCS += \
   ./watch-faces/demo/all_segments_face.c \
   ./watch-faces/demo/character_set_face.c \
   ./watch-faces/demo/light_sensor_face.c \
+  ./watch-faces/demo/peek_memory_face.c \
   ./watch-faces/sensor/accelerometer_status_face.c \
   ./watch-faces/sensor/light_meter_face.c \
   ./watch-faces/sensor/temperature_display_face.c \

watch-faces/demo/peek_memory_face.c

@@ -0,0 +1,103 @@
+/*
+ * 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 "peek_memory_face.h"
+#include "watch.h"
+#include "sam.h"
+#include "watch_utility.h"
+#include "watch_common_display.h"
+
+void peek_memory_face_setup(uint8_t watch_face_index, void ** context_ptr) {
+    (void) watch_face_index;
+    if (*context_ptr == NULL) {
+        *context_ptr = malloc(sizeof(peek_memory_state_t));
+        peek_memory_state_t *state = (peek_memory_state_t *)*context_ptr;
+        memset(*context_ptr, 0, sizeof(peek_memory_state_t));
+#if __EMSCRIPTEN__
+        // note: DOES NOT WORK IN SIMULATOR! Needs custom LCD to display hex
+        static uint32_t dummy_value = 0x12345678;
+        state->location = &dummy_value;
+        state->format = PEEK_MEMORY_FORMAT_HEX;
+#else
+        state->location = &(RTC->MODE2.TIMESTAMP.reg);
+        state->format = PEEK_MEMORY_FORMAT_DATE;
+#endif
+    }
+}
+
+void peek_memory_face_activate(void *context) {
+    (void) context;
+}
+
+bool peek_memory_face_loop(movement_event_t event, void *context) {
+    peek_memory_state_t *state = (peek_memory_state_t *)context;
+    uint32_t value;
+    watch_date_time_t *datetime;
+    char buf[11];
+
+    switch (event.event_type) {
+        case EVENT_ACTIVATE:
+        case EVENT_TICK:
+            memcpy(&value, state->location, 4);
+            switch (state->format) {
+                case PEEK_MEMORY_FORMAT_HEX:
+                    sprintf(buf, "%08X", value);
+                    watch_display_character('M', 0);
+                    watch_display_character(buf[0], 1);
+                    watch_display_character(buf[1], 10);
+                    watch_display_character(buf[2], 2);
+                    watch_display_character(buf[3], 3);
+                    watch_display_character(buf[4], 4);
+                    watch_display_character(buf[5], 5);
+                    watch_display_character(buf[6], 6);
+                    watch_display_character(buf[7], 7);
+                    break;
+                case PEEK_MEMORY_FORMAT_DATE:
+                    datetime = (rtc_date_time_t *)&value;
+                    sprintf(buf, "M%d", datetime->unit.month);
+                    watch_display_text_with_fallback(WATCH_POSITION_TOP_LEFT, buf, buf + 1);
+                    sprintf(buf, "%2d", datetime->unit.day);
+                    watch_display_text(WATCH_POSITION_TOP_RIGHT, buf);
+                    sprintf(buf, "%02d%02d%02d", datetime->unit.hour, datetime->unit.minute, datetime->unit.second);
+                    watch_display_text(WATCH_POSITION_BOTTOM, buf);
+                    watch_set_colon();
+                    break;
+            }
+            break;
+        case EVENT_TIMEOUT:
+            movement_move_to_face(0);
+            break;
+        default:
+            movement_default_loop_handler(event);
+            break;
+    }
+
+    return true;
+}
+
+void peek_memory_face_resign(void *context) {
+    (void) context;
+}

watch-faces/demo/peek_memory_face.h

@@ -0,0 +1,60 @@
+/*
+ * 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.
+ */
+
+#pragma once
+
+/*
+ * PEEK FACE
+ *
+ * This watch face displays a location in memory in a given format.
+ * Currently hard coded but would be cool to let user select it somehow.
+ *
+ * Only works with custom LCD. This is for debugging purposes only.
+ */
+
+#include "movement.h"
+
+/// TODO: more formats, signed and unsigned decimal, etc.
+typedef enum {
+    PEEK_MEMORY_FORMAT_HEX = 0,
+    PEEK_MEMORY_FORMAT_DATE
+} peek_memory_format_t;
+
+typedef struct {
+    uint8_t format;
+    void *location;
+} peek_memory_state_t;
+
+void peek_memory_face_setup(uint8_t watch_face_index, void ** context_ptr);
+void peek_memory_face_activate(void *context);
+bool peek_memory_face_loop(movement_event_t event, void *context);
+void peek_memory_face_resign(void *context);
+
+#define peek_memory_face ((const watch_face_t){ \
+    peek_memory_face_setup, \
+    peek_memory_face_activate, \
+    peek_memory_face_loop, \
+    peek_memory_face_resign, \
+    NULL, \
+})