[bsp]add stm32f4xx bsp rtc driver
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FlyM
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/*
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* File : stm32f4_rtc.c
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* This file is stm32f4 rtc driver part of RT-Thread RTOS
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* COPYRIGHT (C) 2009, RT-Thread Development Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rt-thread.org/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2015-09-29 FlyM the first version.
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*/
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#include <time.h>
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#include <rtthread.h>
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#include <stm32f4xx.h>
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#include "stm32f4_rtc.h"
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static int get_week(int year, int month, int day)
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{
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if (month==1||month==2)
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{
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year -=1;
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month +=12;
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}
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return (day+1+2*month+3*(month+1)/5+year+(year/4)-year/100+year/400)%7;
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}
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static struct rt_device rtc;
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static rt_err_t rt_rtc_open(rt_device_t dev, rt_uint16_t oflag)
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{
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if (dev->rx_indicate != RT_NULL)
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{
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/* Open Interrupt */
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}
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return RT_EOK;
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}
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static rt_size_t rt_rtc_read(rt_device_t dev, rt_off_t pos, void* buffer, rt_size_t size)
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{
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return 0;
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}
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static rt_err_t rt_rtc_control(rt_device_t dev, rt_uint8_t cmd, void *args)
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{
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rt_time_t *time;
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RT_ASSERT(dev != RT_NULL);
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switch (cmd)
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{
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case RT_DEVICE_CTRL_RTC_GET_TIME:
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{
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struct tm ct;
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RTC_TimeTypeDef t;
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RTC_DateTypeDef d;
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rt_memset(&ct,0,sizeof(struct tm));
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time = (rt_time_t *)args;
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/* read device */
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RTC_GetDate(RTC_Format_BIN,&d);
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RTC_GetTime(RTC_Format_BIN,&t);
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ct.tm_year = d.RTC_Year + 100;
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ct.tm_mon = d.RTC_Month - 1;
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ct.tm_mday = d.RTC_Date;
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ct.tm_wday = d.RTC_WeekDay;
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ct.tm_hour = t.RTC_Hours;
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ct.tm_min = t.RTC_Minutes;
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ct.tm_sec = t.RTC_Seconds;
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*time = mktime(&ct);
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}
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break;
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case RT_DEVICE_CTRL_RTC_SET_TIME:
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{
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struct tm *ct;
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struct tm tm_new;
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time_t *time;
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RTC_TimeTypeDef RTC_TimeStructure;
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RTC_InitTypeDef RTC_InitStructure;
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RTC_DateTypeDef RTC_DateStructure;
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time = (time_t *)args;
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/* lock scheduler. */
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rt_enter_critical();
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/* converts calendar time time into local time. */
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ct = localtime(time);
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/* copy the statically located variable */
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rt_memcpy(&tm_new, ct, sizeof(struct tm));
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/* unlock scheduler. */
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rt_exit_critical();
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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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/* ck_spre(1Hz) = RTCCLK(LSI) /(uwAsynchPrediv + 1)*(uwSynchPrediv + 1)*/
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//uwSynchPrediv = 0xFF;
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//uwAsynchPrediv = 0x7F;
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/* Configure the RTC data register and RTC prescaler */
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RTC_InitStructure.RTC_AsynchPrediv = 0x7F;
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RTC_InitStructure.RTC_SynchPrediv = 0xFF;
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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 */
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RTC_DateStructure.RTC_Year = tm_new.tm_year - 100;
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RTC_DateStructure.RTC_Month = tm_new.tm_mon + 1;
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RTC_DateStructure.RTC_Date = tm_new.tm_mday;
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RTC_DateStructure.RTC_WeekDay = get_week(tm_new.tm_year+1900,tm_new.tm_mon+1,tm_new.tm_mday);
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RTC_SetDate(RTC_Format_BIN, &RTC_DateStructure);
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/* Set the time*/
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if (tm_new.tm_hour > 11)
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{
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RTC_TimeStructure.RTC_H12 = RTC_H12_PM;
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}
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else
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{
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RTC_TimeStructure.RTC_H12 = RTC_H12_AM;
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}
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RTC_TimeStructure.RTC_Hours = tm_new.tm_hour;
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RTC_TimeStructure.RTC_Minutes = tm_new.tm_min;
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RTC_TimeStructure.RTC_Seconds = tm_new.tm_sec;
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RTC_SetTime(RTC_Format_BIN, &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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break;
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}
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return RT_EOK;
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}
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/*******************************************************************************
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* Function Name : RTC_Configuration
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* Description : Configures the RTC.
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* Input : None
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* Output : None
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* Return : 0 reday,-1 error.
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*******************************************************************************/
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int RTC_Configuration(void)
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{
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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 defined (RTC_CLOCK_SOURCE_LSI) /* LSI used as RTC source clock*/
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/* The RTC Clock may varies due to LSI frequency dispersion */
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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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}
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/* Select the RTC Clock Source */
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RCC_RTCCLKConfig(RCC_RTCCLKSource_LSI);
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/* ck_spre(1Hz) = RTCCLK(LSI) /(uwAsynchPrediv + 1)*(uwSynchPrediv + 1)*/
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//uwSynchPrediv = 0xFF;
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//uwAsynchPrediv = 0x7F;
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#elif defined (RTC_CLOCK_SOURCE_LSE) /* LSE used as RTC source clock */
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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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while(RCC_GetFlagStatus(RCC_FLAG_LSERDY) == RESET)
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{
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}
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/* Select the RTC Clock Source */
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RCC_RTCCLKConfig(RCC_RTCCLKSource_LSE);
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#else
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#error Please select the RTC Clock source inside the main.c file
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#endif /* RTC_CLOCK_SOURCE_LSI */
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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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return 0;
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}
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void rt_hw_rtc_init(void)
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{
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rtc.type = RT_Device_Class_RTC;
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if (RTC_ReadBackupRegister(RTC_BKP_DR0) != 0x32F2)
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{
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rt_kprintf("rtc is not configured\n");
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rt_kprintf("please configure with set_date and set_time\n");
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if ( RTC_Configuration() != 0)
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{
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rt_kprintf("rtc configure fail...\r\n");
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return ;
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}
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}
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else
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{
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/* Wait for RTC registers synchronization */
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RTC_WaitForSynchro();
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}
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/* register rtc device */
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rtc.init = RT_NULL;
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rtc.open = rt_rtc_open;
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rtc.close = RT_NULL;
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rtc.read = rt_rtc_read;
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rtc.write = RT_NULL;
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rtc.control = rt_rtc_control;
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/* no private */
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rtc.user_data = RT_NULL;
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rt_device_register(&rtc, "rtc", RT_DEVICE_FLAG_RDWR);
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return;
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}
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#ifdef RT_USING_FINSH
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#include "finsh.h"
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void show_time(void)
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{
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RTC_TimeTypeDef t;
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RTC_DateTypeDef d;
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/* Get the current Date */
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RTC_GetDate(RTC_Format_BIN,&d);
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/* Get the current Time */
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RTC_GetTime(RTC_Format_BIN, &t);
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/* Display time Format : hh:mm:ss */
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rt_kprintf("Now Time = 20%02d %02d %02d[%02d]-%0.2d:%0.2d:%0.2d \r\n", \
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d.RTC_Year,d.RTC_Month,d.RTC_Date,d.RTC_WeekDay,t.RTC_Hours, t.RTC_Minutes, t.RTC_Seconds);
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}
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FINSH_FUNCTION_EXPORT(show_time, show current time.)
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#endif
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@ -0,0 +1,23 @@
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/*
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* File : stm32f4_rtc.h
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* This file is stm32f4 rtc driver part of RT-Thread RTOS
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* COPYRIGHT (C) 2009, RT-Thread Development Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rt-thread.org/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2015-09-29 FlyM the first version
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*/
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#ifndef __STM32F4_RTC_H__
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#define __STM32F4_RTC_H__
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#define RTC_CLOCK_SOURCE_LSE
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void rt_hw_rtc_init(void);
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#endif
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