refactor: break out different areas of functionality

watch-library/watch/watch_deepsleep.c

@@ -0,0 +1,85 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2020 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.
+ */
+
+ext_irq_cb_t a2_callback;
+ext_irq_cb_t d1_callback;
+
+ static void extwake_callback(uint8_t reason) {
+    if (reason & RTC_TAMPID_TAMPID2) {
+        if (btn_alarm_callback != NULL) btn_alarm_callback();
+    } else if (reason & RTC_TAMPID_TAMPID1) {
+        if (a2_callback != NULL) a2_callback();
+    } else if (reason & RTC_TAMPID_TAMPID0) {
+        if (d1_callback != NULL) d1_callback();
+    }
+}
+
+void watch_register_extwake_callback(uint8_t pin, ext_irq_cb_t callback) {
+    uint32_t pinmux;
+    if (pin == D1) {
+        d1_callback = callback;
+        pinmux = PINMUX_PB00G_RTC_IN0;
+    } else if (pin == A2) {
+        a2_callback = callback;
+        pinmux = PINMUX_PB02G_RTC_IN1;
+    } else {
+        return;
+    }
+    gpio_set_pin_direction(pin, GPIO_DIRECTION_IN);
+    gpio_set_pin_function(pin, pinmux);
+    _extwake_register_callback(&CALENDAR_0.device, extwake_callback);
+}
+
+void watch_store_backup_data(uint32_t data, uint8_t reg) {
+    if (reg < 8) {
+        RTC->MODE0.BKUP[reg].reg = data;
+    }
+}
+
+uint32_t watch_get_backup_data(uint8_t reg) {
+    if (reg < 8) {
+        return RTC->MODE0.BKUP[reg].reg;
+    }
+
+    return 0;
+}
+
+void watch_enter_deep_sleep() {
+    // enable and configure the external wake interrupt, if not already set up.
+    if (btn_alarm_callback == NULL && a2_callback == NULL && d1_callback == NULL) {
+        gpio_set_pin_direction(BTN_ALARM, GPIO_DIRECTION_IN);
+        gpio_set_pin_pull_mode(BTN_ALARM, GPIO_PULL_DOWN);
+        gpio_set_pin_function(BTN_ALARM, PINMUX_PA02G_RTC_IN2);
+        _extwake_register_callback(&CALENDAR_0.device, extwake_callback);
+    }
+
+    // disable SLCD
+    slcd_sync_deinit(&SEGMENT_LCD_0);
+    hri_mclk_clear_APBCMASK_SLCD_bit(SLCD);
+
+    // TODO: disable other peripherals
+
+    // go into backup sleep mode
+    sleep(5);
+}