libs/rt-thread-official
libs
/
rt-thread-official
mirror of https://github.com/RT-Thread/rt-thread.git
4
0
Fork 0
Code Issues Releases Wiki Activity
rt-thread-official/bsp/efm32/drv_rtc.c

326 lines
8.1 KiB
C
Raw Blame History

/******************************************************************//**
* @file drv_rtc.c
* @brief RTC driver of RT-Thread RTOS for EFM32
* COPYRIGHT (C) 2011, RT-Thread Development Team
* @author Bernard, onelife
* @version 0.4 beta
**********************************************************************
* @section License
* The license and distribution terms for this file may be found in the file LICENSE in this
* distribution or at http://www.rt-thread.org/license/LICENSE
**********************************************************************
* @section Change Logs
* Date Author Notes
* 2009-01-05 Bernard the first version
* 2010-12-27 onelife Modification for EFM32
*********************************************************************/
/******************************************************************//**
* @addtogroup efm32
* @{
*********************************************************************/
/* Includes -------------------------------------------------------------------*/
#include "board.h"
#include "hdl_interrupt.h"
#include "drv_rtc.h"
/* Private typedef -------------------------------------------------------------*/
/* Private define --------------------------------------------------------------*/
/* Private macro --------------------------------------------------------------*/
/* Private variables ------------------------------------------------------------*/
static struct rt_device rtc;
static rt_uint32_t rtc_time;
/* Private function prototypes ---------------------------------------------------*/
static void startLfxoForRtc(void);
/* Private functions ------------------------------------------------------------*/
static rt_err_t rt_rtc_open(rt_device_t dev, rt_uint16_t oflag)
{
if (dev->rx_indicate != RT_NULL)
{
/* Open Interrupt */
}
return RT_EOK;
}
static rt_size_t rt_rtc_read(
rt_device_t dev,
rt_off_t pos,
void* buffer,
rt_size_t size)
{
return 0;
}
/******************************************************************//**
* @brief
* Configure RTC device
*
* @details
*
* @note
*
* @param[in] dev
* Pointer to device descriptor
*
* @param[in] cmd
* RTC control command
*
* @param[in] args
* Arguments
*
* @return
* Error code
*********************************************************************/
static rt_err_t rt_rtc_control(rt_device_t dev, rt_uint8_t cmd, void *args)
{
RT_ASSERT(dev != RT_NULL);
switch (cmd)
{
case RT_DEVICE_CTRL_RTC_GET_TIME:
*(rt_uint32_t *)args = rtc_time + RTC_CounterGet();
break;
case RT_DEVICE_CTRL_RTC_SET_TIME:
{
rtc_time = *(rt_uint32_t *)args;
/* Reset counter */
RTC_Enable(false);
RTC_Enable(true);
}
break;
}
return RT_EOK;
}
/******************************************************************//**
* @brief
* RTC counter overflow interrupt handler
*
* @details
*
* @note
*********************************************************************/
void rt_hw_rtc_isr(rt_device_t device)
{
if (RTC->IF & RTC_IFC_OF)
{
rtc_time += _RTC_CNT_MASK;
}
RTC->IFC = _RTC_IFC_MASK;
}
/******************************************************************//**
* @brief
* Register RTC device
*
* @details
*
* @note
*
* @param[in] device
* Pointer to device descriptor
*
* @param[in] name
* Device name
*
* @param[in] flag
* Configuration flags
*
* @return
* Error code
*********************************************************************/
rt_err_t rt_hw_rtc_register(
rt_device_t device,
const char *name,
rt_uint32_t flag)
{
RT_ASSERT(device != RT_NULL);
device->type = RT_Device_Class_RTC;
device->rx_indicate = RT_NULL;
device->tx_complete = RT_NULL;
device->init = RT_NULL;
device->open = rt_rtc_open;
device->close = RT_NULL;
device->read = rt_rtc_read;
device->write = RT_NULL;
device->control = rt_rtc_control;
device->user_data = RT_NULL; /* no private */
/* register a character device */
return rt_device_register(device, name, RT_DEVICE_FLAG_RDWR | flag);
}
/******************************************************************//**
* @brief
* Initialize all RTC module related hardware and register RTC device to kernel
*
* @details
*
* @note
*********************************************************************/
void rt_hw_rtc_init(void)
{
rt_uint32_t reset;
reset = RMU_ResetCauseGet();
// TODO: What is the current reset mode?
if (reset & RMU_RSTCAUSE_PORST || reset & RMU_RSTCAUSE_EXTRST)
{
RTC_Init_TypeDef rtcInit;
efm32_irq_hook_init_t hook;
rtcInit.enable = true;
rtcInit.debugRun = false;
rtcInit.comp0Top = false;
rtc_time = 0UL;
rt_kprintf("rtc is not configured\n");
rt_kprintf("please configure with set_date and set_time\n");
/* Configuring clocks in the Clock Management Unit (CMU) */
startLfxoForRtc();
/* Initialize and enable RTC */
RTC_Init(&rtcInit);
hook.type = efm32_irq_type_rtc;
hook.unit = 0;
hook.cbFunc = rt_hw_rtc_isr;
hook.userPtr = RT_NULL;
efm32_irq_hook_register(&hook);
/* Enabling Interrupt from RTC */
RTC_IntEnable(RTC_IFC_OF);
RTC_IntClear(RTC_IFC_OF);
NVIC_ClearPendingIRQ(RTC_IRQn);
NVIC_SetPriority(RTC_IRQn, EFM32_IRQ_PRI_DEFAULT);
NVIC_EnableIRQ(RTC_IRQn);
}
/* register rtc device */
rt_hw_rtc_register(&rtc, RT_RTC_NAME, EFM32_NO_DATA);
}
/******************************************************************//**
* @brief
* Start LFXO for RTC
*
* @details
* Starts the LFXO and routes it to the RTC. RTC clock is prescaled to save energy.
*
* @note
*********************************************************************/
static void startLfxoForRtc(void)
{
/* Starting LFXO and waiting until it is stable */
CMU_OscillatorEnable(cmuOsc_LFXO, true, true);
/* Routing the LFXO clock to the RTC */
CMU_ClockDivSet(cmuClock_RTC,cmuClkDiv_32768);
CMU_ClockSelectSet(cmuClock_LFA,cmuSelect_LFXO);
CMU_ClockEnable(cmuClock_RTC, true);
}
/*********************************************************************
* Export to FINSH
*********************************************************************/
#ifdef RT_USING_FINSH
#include <finsh.h>
#include <time.h>
time_t time(time_t* t)
{
rt_device_t device;
time_t time;
device = rt_device_find("rtc");
if (device != RT_NULL)
{
rt_device_control(device, RT_DEVICE_CTRL_RTC_GET_TIME, &time);
if (t != RT_NULL) *t = time;
}
return time;
}
void set_date(rt_uint32_t year, rt_uint32_t month, rt_uint32_t day)
{
time_t now;
struct tm* ti;
rt_device_t device;
ti = RT_NULL;
/* get current time */
time(&now);
ti = localtime(&now);
if (ti != RT_NULL)
{
ti->tm_year = year - 1900;
ti->tm_mon = month - 1; /* ti->tm_mon = month; */
ti->tm_mday = day;
}
now = mktime(ti);
device = rt_device_find("rtc");
if (device != RT_NULL)
{
rt_rtc_control(device, RT_DEVICE_CTRL_RTC_SET_TIME, &now);
}
}
FINSH_FUNCTION_EXPORT(set_date, set date. e.g: set_date(2010,2,28))
void set_time(rt_uint32_t hour, rt_uint32_t minute, rt_uint32_t second)
{
time_t now;
struct tm* ti;
rt_device_t device;
ti = RT_NULL;
/* get current time */
time(&now);
ti = localtime(&now);
if (ti != RT_NULL)
{
ti->tm_hour = hour;
ti->tm_min = minute;
ti->tm_sec = second;
}
now = mktime(ti);
device = rt_device_find("rtc");
if (device != RT_NULL)
{
rt_rtc_control(device, RT_DEVICE_CTRL_RTC_SET_TIME, &now);
}
}
FINSH_FUNCTION_EXPORT(set_time, set time. e.g: set_time(23,59,59))
void list_date()
{
time_t now;
time(&now);
rt_kprintf("%s\n", ctime(&now));
}
FINSH_FUNCTION_EXPORT(list_date, show date and time.)
#endif
/******************************************************************//**
* @}
*********************************************************************/
View Git Blame Copy Permalink