feat(swan_r5): adds a basic RTC implementation.

ports/stm/boards/swan_r5/mpconfigboard.mk

@@ -70,3 +70,4 @@ CIRCUITPY_BLEIO = 0
 CIRCUITPY_BUSDEVICE = 0
 CIRCUITPY_KEYPAD = 1
 CIRCUITPY_RGBMATRIX = 0
+CIRCUITPY_RTC = 1

ports/stm/common-hal/rtc/RTC.c

@@ -0,0 +1,54 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 20212 Matthew McGowan for Blues Wireless Inc
+ *
+ * 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 <stdio.h>
+
+#include "py/obj.h"
+#include "py/runtime.h"
+#include "shared/timeutils/timeutils.h"
+#include "shared-bindings/rtc/__init__.h"
+#include "common-hal/rtc/RTC.h"
+#include "shared-bindings/rtc/RTC.h"
+#include "supervisor/port.h"
+#include "supervisor/shared/translate.h"
+#include "peripherals/rtc.h"
+
+
+void common_hal_rtc_set_time(timeutils_struct_time_t *tm) {
+    stm32_peripherals_rtc_set_time(tm);
+}
+
+void common_hal_rtc_get_time(timeutils_struct_time_t *tm) {
+    stm32_peripherals_rtc_get_time(tm);
+}
+
+int common_hal_rtc_get_calibration(void) {
+    return 0;
+}
+
+void common_hal_rtc_set_calibration(int calibration) {
+    mp_raise_NotImplementedError_varg(translate("%q"), MP_QSTR_calibration);
+}

ports/stm/common-hal/rtc/RTC.h

@@ -0,0 +1,33 @@
+/*
+ * This file is part of the MicroPython project, http://micropython.org/
+ *
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2022 Matthew McGowan for Blues Wireless Inc
+ *
+ * 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 MICROPY_INCLUDED_STM_COMMON_HAL_RTC_RTC_H
+#define MICROPY_INCLUDED_STM_COMMON_HAL_RTC_RTC_H
+
+extern void rtc_init(void);
+extern void rtc_reset(void);
+
+#endif  // MICROPY_INCLUDED_STM_COMMON_HAL_RTC_RTC_H

ports/stm/peripherals/rtc.c

@@ -4,6 +4,7 @@
  * The MIT License (MIT)
  *
  * Copyright (c) 2021 Lucian Copeland for Adafruit Industries
+ * Copyright (c) 2022 Matthew McGowan for Blues Wireless Inc
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -76,6 +77,46 @@ void stm32_peripherals_rtc_init(void) {
     HAL_NVIC_EnableIRQ(RTC_Alarm_IRQn);
 }
 
+#if CIRCUITPY_RTC
+void stm32_peripherals_rtc_get_time(timeutils_struct_time_t *tm) {
+    RTC_DateTypeDef date = {0};
+    RTC_TimeTypeDef time = {0};
+
+    int code;
+    if ((code = HAL_RTC_GetTime(&hrtc, &time, RTC_FORMAT_BIN)) == HAL_OK &&
+        (code = HAL_RTC_GetDate(&hrtc, &date, RTC_FORMAT_BIN)) == HAL_OK) {
+        tm->tm_hour = time.Hours;
+        tm->tm_min = time.Minutes;
+        tm->tm_sec = time.Seconds;
+        tm->tm_wday = date.WeekDay - 1;
+        tm->tm_mday = date.Date;
+        tm->tm_mon = date.Month;
+        tm->tm_year = date.Year + 2000;
+        tm->tm_yday = -1;
+    }
+}
+
+void stm32_peripherals_rtc_set_time(timeutils_struct_time_t *tm) {
+    RTC_DateTypeDef date = {0};
+    RTC_TimeTypeDef time = {0};
+
+    time.Hours = tm->tm_hour;
+    time.Minutes = tm->tm_min;
+    time.Seconds = tm->tm_sec;
+    date.WeekDay = tm->tm_wday + 1;
+    date.Date = tm->tm_mday;
+    date.Month = tm->tm_mon;
+    date.Year = tm->tm_year - 2000;
+    time.DayLightSaving = RTC_DAYLIGHTSAVING_NONE;
+    time.StoreOperation = RTC_STOREOPERATION_RESET;
+
+    if (HAL_RTC_SetTime(&hrtc, &time, RTC_FORMAT_BIN) != HAL_OK ||
+        HAL_RTC_SetDate(&hrtc, &date, RTC_FORMAT_BIN) != HAL_OK) {
+        // todo - throw an exception
+    }
+}
+#endif
+
 // This function is called often for timing so we cache the seconds elapsed computation based on the
 // register value. The STM HAL always does shifts and conversion if we use it directly.
 uint64_t stm32_peripherals_rtc_raw_ticks(uint8_t *subticks) {

ports/stm/peripherals/rtc.h

@@ -4,6 +4,7 @@
  * The MIT License (MIT)
  *
  * Copyright (c) 2021 Lucian Copeland for Adafruit Industries
+ * Copyright (c) 2022 Matthew McGowan for Blues Wireless Inc
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
@@ -48,4 +49,10 @@ void stm32_peripherals_rtc_assign_alarm_callback(uint8_t alarm_idx, void (*callb
 void stm32_peripherals_rtc_set_alarm(uint8_t alarm_idx, uint32_t ticks);
 bool stm32_peripherals_rtc_alarm_triggered(uint8_t alarm_idx);
 
+#if CIRCUITPY_RTC
+typedef struct _timeutils_struct_time_t timeutils_struct_time_t;
+void stm32_peripherals_rtc_get_time(timeutils_struct_time_t *tm);
+void stm32_peripherals_rtc_set_time(timeutils_struct_time_t *tm);
+#endif
+
 #endif // __MICROPY_INCLUDED_STM32_PERIPHERALS_RTC_H__

ports/stm/supervisor/port.c

@@ -61,6 +61,9 @@
 #if CIRCUITPY_ALARM
 #include "common-hal/alarm/__init__.h"
 #endif
+#if CIRCUITPY_RTC
+#include "shared-bindings/rtc/__init__.h"
+#endif
 
 #include "peripherals/clocks.h"
 #include "peripherals/gpio.h"
@@ -241,6 +244,10 @@ void SysTick_Handler(void) {
 
 void reset_port(void) {
     reset_all_pins();
+    #if CIRCUITPY_RTC
+    rtc_reset();
+    #endif
+
     #if CIRCUITPY_AUDIOPWMIO
     audiopwmout_reset();
     #endif