131 lines
3.7 KiB
C
131 lines
3.7 KiB
C
#include <stdio.h>
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#include <stm32f4xx.h>
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#include "misc.h"
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#include "mpconfig.h"
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#include "qstr.h"
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#include "obj.h"
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#include "systick.h"
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#include "rtc.h"
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machine_uint_t rtc_info;
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#define RTC_INFO_USE_EXISTING (0)
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#define RTC_INFO_USE_LSE (1)
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#define RTC_INFO_USE_LSI (3)
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void rtc_init(void) {
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// Enable the PWR clock
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
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// Allow access to RTC
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PWR_BackupAccessCmd(ENABLE);
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if (RTC_ReadBackupRegister(RTC_BKP_DR0) == 0x32F2) {
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// RTC still alive, so don't re-init it
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// wait for RTC APB register synchronisation
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RTC_WaitForSynchro();
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rtc_info = RTC_INFO_USE_EXISTING;
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return;
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}
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uint32_t timeout = 10000000;
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// Enable the PWR clock
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RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
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// Allow access to RTC
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PWR_BackupAccessCmd(ENABLE);
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// Enable the LSE OSC
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RCC_LSEConfig(RCC_LSE_ON);
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// Wait till LSE is ready
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machine_uint_t sys_tick = sys_tick_counter;
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while((RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET) && (--timeout > 0)) {
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}
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// record how long it took for the RTC to start up
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rtc_info = (sys_tick_counter - sys_tick) << 2;
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// If LSE timed out, use LSI instead
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if (timeout == 0) {
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// Disable the LSE OSC
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RCC_LSEConfig(RCC_LSE_OFF);
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// Enable the LSI OSC
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RCC_LSICmd(ENABLE);
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// Wait till LSI is ready
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while(RCC_GetFlagStatus(RCC_FLAG_LSIRDY) == RESET) {
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}
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// Use LSI as the RTC Clock Source
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RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI);
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// record that we are using the LSI
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rtc_info |= RTC_INFO_USE_LSI;
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} else {
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// Use LSE as the RTC Clock Source
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RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);
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// record that we are using the LSE
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rtc_info |= RTC_INFO_USE_LSE;
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}
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// Note: LSI is around (32KHz), these dividers should work either way
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// ck_spre(1Hz) = RTCCLK(LSE) /(uwAsynchPrediv + 1)*(uwSynchPrediv + 1)
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uint32_t uwSynchPrediv = 0xFF;
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uint32_t uwAsynchPrediv = 0x7F;
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// Enable the RTC Clock
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RCC_RTCCLKCmd(ENABLE);
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// Wait for RTC APB registers synchronisation
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RTC_WaitForSynchro();
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// Configure the RTC data register and RTC prescaler
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RTC_InitTypeDef RTC_InitStructure;
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RTC_InitStructure.RTC_AsynchPrediv = uwAsynchPrediv;
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RTC_InitStructure.RTC_SynchPrediv = uwSynchPrediv;
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RTC_InitStructure.RTC_HourFormat = RTC_HourFormat_24;
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RTC_Init(&RTC_InitStructure);
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// Set the date (BCD)
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RTC_DateTypeDef RTC_DateStructure;
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RTC_DateStructure.RTC_Year = 0x13;
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RTC_DateStructure.RTC_Month = RTC_Month_October;
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RTC_DateStructure.RTC_Date = 0x26;
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RTC_DateStructure.RTC_WeekDay = RTC_Weekday_Saturday;
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RTC_SetDate(RTC_Format_BCD, &RTC_DateStructure);
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// Set the time (BCD)
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RTC_TimeTypeDef RTC_TimeStructure;
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RTC_TimeStructure.RTC_H12 = RTC_H12_AM;
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RTC_TimeStructure.RTC_Hours = 0x01;
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RTC_TimeStructure.RTC_Minutes = 0x53;
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RTC_TimeStructure.RTC_Seconds = 0x00;
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RTC_SetTime(RTC_Format_BCD, &RTC_TimeStructure);
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// Indicator for the RTC configuration
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RTC_WriteBackupRegister(RTC_BKP_DR0, 0x32F2);
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}
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/******************************************************************************/
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// Micro Python bindings
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mp_obj_t pyb_rtc_info(void) {
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return mp_obj_new_int(rtc_info);
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}
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MP_DEFINE_CONST_FUN_OBJ_0(pyb_rtc_info_obj, pyb_rtc_info);
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mp_obj_t pyb_rtc_read(void) {
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RTC_TimeTypeDef RTC_TimeStructure;
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RTC_GetTime(RTC_Format_BIN, &RTC_TimeStructure);
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printf("%02d:%02d:%02d\n", RTC_TimeStructure.RTC_Hours, RTC_TimeStructure.RTC_Minutes, RTC_TimeStructure.RTC_Seconds);
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return mp_const_none;
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}
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MP_DEFINE_CONST_FUN_OBJ_0(pyb_rtc_read_obj, pyb_rtc_read);
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