RTC implementation for stm32f4xx

Author: ThomasPietrzak

arch/config.mk

@@ -44,6 +44,7 @@ endif
 ifeq ($(BOARD),stm32f429discovery)
 TARGET_INCLUDES += $(ROOTDIR)/arch/arm/stm32f4xx/stm32f429discovery
 TARGET_CPPFLAGS += -DHSE_VALUE=8000000
+TARGET_CPPFLAGS += -DUSE_HSE_BYPASS
 TARGET_CPPFLAGS += -DPLL_M=8
 LDSCRIPT = $(ROOTDIR)/arch/arm/stm32f4xx/stm32f429.ld
 endif

examples/stm32f429discovery/rtc/Makefile

@@ -0,0 +1,58 @@
+export BOARD = stm32f429discovery
+ROOTDIR = $(CURDIR)/uC-sdk
+
+ifeq ($(wildcard $(ROOTDIR)/uC-sdk.root),)
+ifneq ($(wildcard ../../../uC-sdk.root),)
+ROOTDIR = ../../..
+endif
+endif
+
+TARGET = rtc.bin
+TARGET_SRCS = rtc.c
+
+LIBDEPS = \
+$(ROOTDIR)/FreeRTOS/libFreeRTOS.a \
+$(ROOTDIR)/arch/libarch.a \
+$(ROOTDIR)/os/libos.a \
+$(ROOTDIR)/libc/libc.a \
+$(ROOTDIR)/libm/libm.a \
+$(ROOTDIR)/acorn/libacorn.a \
+$(ROOTDIR)/hardware/libhardware.a \
+
+LIBS = -Wl,--start-group $(LIBDEPS) -Wl,--end-group
+TARGET_INCLUDES = include
+
+include $(ROOTDIR)/common.mk
+
+all: uC-sdk $(TARGET)
+
+clean: clean-generic
+	$(Q)$(MAKE) $(MAKE_OPTS) -C $(ROOTDIR) clean
+
+.PHONY: uC-sdk
+
+$(ROOTDIR)/FreeRTOS/libFreeRTOS.a: uC-sdk
+$(ROOTDIR)/arch/libarch.a: uC-sdk
+$(ROOTDIR)/os/libos.a: uC-sdk
+$(ROOTDIR)/libc/libc.a: uC-sdk
+$(ROOTDIR)/libm/libm.a: uC-sdk
+$(ROOTDIR)/acorn/libacorn.a: uC-sdk
+$(ROOTDIR)/hardware/libhardware.a: uC-sdk
+
+uC-sdk:
+	$(E) "[MAKE]   Entering uC-sdk"
+	$(Q)$(MAKE) $(MAKE_OPTS) -C $(ROOTDIR)
+
+deps: ldeps
+	$(E) "[DEPS]   Creating dependency tree for uC-sdk"
+	$(Q)$(MAKE) $(MAKE_OPTS) -C $(ROOTDIR) ldeps
+
+include $(ROOTDIR)/FreeRTOS/config.mk
+include $(ROOTDIR)/arch/config.mk
+include $(ROOTDIR)/os/config.mk
+include $(ROOTDIR)/libc/config.mk
+include $(ROOTDIR)/libm/config.mk
+include $(ROOTDIR)/acorn/config.mk
+include $(ROOTDIR)/hardware/config.mk
+include $(ROOTDIR)/target-rules.mk
+

examples/stm32f429discovery/rtc/rtc.c

@@ -0,0 +1,56 @@
+#include <stdio.h>
+#include <malloc.h>
+
+#include <gpio.h>
+#include <rtc.h>
+
+void alarm1(void *parameter) {
+  //Cast the parameter back to its origin type
+  pin_t *pin = (pin_t *)parameter;
+  gpio_set(*pin, 1);
+
+  rtc_date_t *d = rtc_get_date();
+  rtc_time_t *t = rtc_get_time();
+
+  printf("Alarm A %d/%d/%d %d:%d:%d\n", d->rtc_day, d->rtc_month, d->rtc_year, t->rtc_hour, t->rtc_minute, t->rtc_second);
+}
+
+void alarm2(void *parameter) {
+  //Cast the parameter back to its origin type
+  pin_t *pin = (pin_t *)parameter;
+  gpio_set(*pin, 0);
+
+  rtc_date_t *d = rtc_get_date();
+  rtc_time_t *t = rtc_get_time();
+
+  printf("Alarm B %d\n", rtc_date_time_to_epoch(d, t));
+}
+
+int main() {
+  pin_t *pin = malloc(sizeof(pin_t));
+  *pin = make_pin(gpio_port_g, 13);
+
+  gpio_config(*pin, pin_dir_write, pull_down);
+
+  rtc_date_t date = {
+    .rtc_year = 2015,
+    .rtc_month = october,
+    .rtc_day = 21
+  };
+
+  rtc_time_t time = {
+    .rtc_hour = 4,
+    .rtc_minute = 29,
+    .rtc_second = 0
+  };
+  rtc_init(&date, &time);
+
+  rtc_set_alarm(rtc_alarm_1, &time, rtc_every_second, alarm1, (void *)pin);
+
+  time.rtc_second = 5;
+  rtc_set_alarm(rtc_alarm_2, &time, rtc_every_minute, alarm2, (void *)pin);
+
+  while(1) {};
+
+  return 0;
+}

hardware/Makefile

@@ -34,6 +34,7 @@ TARGET_SRCS += src/stm32f4xx/ssp.c
 TARGET_SRCS += src/stm32f4xx/timer.c
 TARGET_SRCS += src/stm32f4xx/uart.c
 TARGET_SRCS += src/stm32f4xx/irq.c
+TARGET_SRCS += src/stm32f4xx/rtc.c
 endif
 endif
 

hardware/include/rtc.h

@@ -0,0 +1,94 @@
+#pragma once
+
+#include <decl.h>
+#include <stdint.h>
+#include <stdbool.h>
+
+BEGIN_DECL
+
+typedef struct {
+    uint8_t rtc_hour;
+    uint8_t rtc_minute;
+    uint8_t rtc_second;
+} rtc_time_t;
+
+typedef enum {
+  monday = 1,
+  tuesday = 2,
+  wednesday = 3,
+  thursday = 4,
+  friday = 5,
+  saturday = 6,
+  sunday = 7
+} rtc_weekday_t;
+
+typedef enum {
+  january = 1,
+  february = 2,
+  march = 3,
+  april = 4,
+  may = 5,
+  june = 6,
+  july = 7,
+  august = 8,
+  september = 9,
+  october = 10,
+  november = 11,
+  december = 12
+} rtc_month_t;
+
+typedef struct {
+    uint16_t rtc_year;
+    rtc_month_t rtc_month;
+    uint8_t rtc_day;
+    rtc_weekday_t rtc_weekday;
+} rtc_date_t;
+
+typedef enum {
+  rtc_alarm_1,
+  rtc_alarm_2
+} rtc_alarm_t;
+
+typedef enum {
+    rtc_every_second,
+    rtc_every_minute,
+    rtc_every_hour,
+    rtc_every_day
+} rtc_repeat_t;
+
+/*
+    Initializes the RTC clock
+*/
+void rtc_init(rtc_date_t *date, rtc_time_t *time);
+
+/*
+    Sets the current time
+*/
+void rtc_set_time(rtc_time_t *time);
+
+/*
+    Gets the current time
+*/
+rtc_time_t *rtc_get_time();
+
+/*
+    Sets the current date
+*/
+void rtc_set_date(rtc_date_t *date);
+
+/*
+    Gets the current date
+*/
+rtc_date_t *rtc_get_date();
+
+/*
+    Gets the epoch value from a date and time
+*/
+uint32_t rtc_date_time_to_epoch(rtc_date_t* date, rtc_time_t *time);
+
+/*
+    Sets a callback to be executed at a specified moment
+*/
+void rtc_set_alarm(rtc_alarm_t alarm, rtc_time_t *time, rtc_repeat_t pattern, void (*cb)(), void *parameter);
+
+END_DECL