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rt-thread/bsp/efm32/drv_timer.c

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/***************************************************************************//**
* @file drv_timer.c
* @brief Timer driver of RT-Thread RTOS for EFM32
* COPYRIGHT (C) 2012, RT-Thread Development Team
* @author onelife
* @version 1.0
*******************************************************************************
* @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
* 2011-01-18 onelife Initial creation for EFM32
* 2011-06-17 onelife Modify init function for efm32lib v2 upgrading
******************************************************************************/
/***************************************************************************//**
* @addtogroup efm32
* @{
******************************************************************************/
/* Includes ------------------------------------------------------------------*/
#include "board.h"
#include "drv_timer.h"
#if (defined(RT_USING_TIMER0) || defined(RT_USING_TIMER1) || defined(RT_USING_TIMER2))
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
#ifdef RT_TIMER_DEBUG
#define timer_debug(format,args...) rt_kprintf(format, ##args)
#else
#define timer_debug(format,args...)
#endif
#define TIMER_TopCalculate(p) \
(p * (EFM32_HFXO_FREQUENCY / (1 << TMR_CFG_PRESCALER) / 1000))
/* Private variables ---------------------------------------------------------*/
#ifdef RT_USING_TIMER0
static struct rt_device timer0_device;
#endif
#ifdef RT_USING_TIMER1
static struct rt_device timer1_device;
#endif
#ifdef RT_USING_TIMER2
static struct rt_device timer2_device;
#endif
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
/***************************************************************************//**
* @brief
* Initialize Timer device
*
* @details
*
* @note
*
* @param[in] dev
* Pointer to device descriptor
*
* @return
* Error code
******************************************************************************/
static rt_err_t rt_hs_timer_init (rt_device_t dev)
{
RT_ASSERT(dev != RT_NULL);
struct efm32_timer_device_t *timer;
timer = (struct efm32_timer_device_t *)(dev->user_data);
timer->hook.cbFunc = RT_NULL;
timer->hook.userPtr = RT_NULL;
return RT_EOK;
}
/***************************************************************************//**
* @brief
* Configure Timer device
*
* @details
*
* @note
*
* @param[in] dev
* Pointer to device descriptor
*
* @param[in] cmd
* Timer control command
*
* @param[in] args
* Arguments
*
* @return
* Error code
******************************************************************************/
static rt_err_t rt_hs_timer_control (
rt_device_t dev,
rt_uint8_t cmd,
void *args)
{
RT_ASSERT(dev != RT_NULL);
struct efm32_timer_device_t *timer;
timer = (struct efm32_timer_device_t *)(dev->user_data);
switch (cmd)
{
case RT_DEVICE_CTRL_SUSPEND:
/* Suspend device */
dev->flag |= RT_DEVICE_FLAG_SUSPENDED;
TIMER_Enable(timer->timer_device, false);
break;
case RT_DEVICE_CTRL_RESUME:
/* Resume device */
dev->flag &= ~RT_DEVICE_FLAG_SUSPENDED;
TIMER_Enable(timer->timer_device, true);
break;
case RT_DEVICE_CTRL_TIMER_PERIOD:
{
/* change device setting */
struct efm32_timer_control_t *control;
rt_uint32_t running;
control = (struct efm32_timer_control_t *)args;
running = timer->timer_device->STATUS & 0x00000001;
TIMER_Enable(timer->timer_device, false);
timer->timer_device->CNT = _TIMER_CNT_RESETVALUE;
TIMER_TopSet(timer->timer_device, TIMER_TopCalculate(control->period));
timer->hook.cbFunc = control->hook.cbFunc;
timer->hook.userPtr = control->hook.userPtr;
if (running)
{
TIMER_Enable(timer->timer_device, true);
}
}
break;
}
return RT_EOK;
}
/***************************************************************************//**
* @brief
* Register Timer device
*
* @details
*
* @note
*
* @param[in] device
* Pointer to device descriptor
*
* @param[in] name
* Device name
*
* @param[in] flag
* Configuration flags
*
* @param[in] timer
* Pointer to Timer device descriptor
*
* @return
* Error code
******************************************************************************/
rt_err_t rt_hw_timer_register(
rt_device_t device,
const char *name,
rt_uint32_t flag,
struct efm32_timer_device_t *timer)
{
RT_ASSERT(device != RT_NULL);
device->type = RT_Device_Class_Char; /* fixme: should be timer type*/
device->rx_indicate = RT_NULL;
device->tx_complete = RT_NULL;
device->init = rt_hs_timer_init;
device->open = RT_NULL;
device->close = RT_NULL;
device->read = RT_NULL;
device->write = RT_NULL;
device->control = rt_hs_timer_control;
device->user_data = timer;
/* register a character device */
return rt_device_register(device, name, flag);
}
/***************************************************************************//**
* @brief
* Timer counter overflow interrupt handler
*
* @details
*
* @note
******************************************************************************/
void rt_hw_timer_isr(rt_device_t dev)
{
RT_ASSERT(dev != RT_NULL);
struct efm32_timer_device_t *timer;
timer = (struct efm32_timer_device_t *)(dev->user_data);
if (timer->hook.cbFunc != RT_NULL)
{
(timer->hook.cbFunc)(timer->hook.userPtr);
}
}
/***************************************************************************//**
* @brief
* Initialize the specified TIMER unit
*
* @details
*
* @note
*
* @param[in] device
* Pointer to device descriptor
*
* @param[in] unitNumber
* Unit number
*
* @return
* Pointer to TIMER device
******************************************************************************/
static struct efm32_timer_device_t *rt_hw_timer_unit_init(
rt_device_t device,
rt_uint8_t unitNumber,
rt_uint8_t mode)
{
struct efm32_timer_device_t *timer;
TIMER_Init_TypeDef init;
efm32_irq_hook_init_t hook;
CMU_Clock_TypeDef timerClock;
IRQn_Type timerIrq;
do
{
/* Allocate device */
timer = rt_malloc(sizeof(struct efm32_timer_device_t));
if (timer == RT_NULL)
{
timer_debug("no memory for TIMER%d driver\n", unitNumber);
break;
}
/* Initialization */
if (unitNumber >= TIMER_COUNT)
{
break;
}
switch (unitNumber)
{
case 0:
timer->timer_device = TIMER0;
timerClock = (CMU_Clock_TypeDef)cmuClock_TIMER0;
timerIrq = TIMER0_IRQn;
break;
case 1:
timer->timer_device = TIMER1;
timerClock = (CMU_Clock_TypeDef)cmuClock_TIMER1;
timerIrq = TIMER1_IRQn;
break;
case 2:
timer->timer_device = TIMER2;
timerClock = (CMU_Clock_TypeDef)cmuClock_TIMER2;
timerIrq = TIMER2_IRQn;
break;
default:
break;
}
/* Enable TIMER clock */
CMU_ClockEnable(timerClock, true);
/* Reset */
TIMER_Reset(timer->timer_device);
/* Init specified TIMER unit */
init.enable = false;
init.debugRun = true;
init.prescale = TMR_CFG_PRESCALER;
init.clkSel = timerClkSelHFPerClk;
init.fallAction = timerInputActionNone;
init.riseAction = timerInputActionNone;
init.mode = timerModeUp;
init.dmaClrAct = false;
init.quadModeX4 = false;
init.oneShot = (mode > 0) ? true : false;
init.sync = false;
TIMER_Init(timer->timer_device, &init);
/* Config interrupt and NVIC */
hook.type = efm32_irq_type_timer;
hook.unit = unitNumber;
hook.cbFunc = rt_hw_timer_isr;
hook.userPtr = device;
efm32_irq_hook_register(&hook);
/* Enable overflow interrupt */
TIMER_IntEnable(timer->timer_device, TIMER_IF_OF);
TIMER_IntClear(timer->timer_device, TIMER_IF_OF);
/* Enable TIMERn interrupt vector in NVIC */
NVIC_ClearPendingIRQ(timerIrq);
NVIC_SetPriority(timerIrq, EFM32_IRQ_PRI_DEFAULT);
NVIC_EnableIRQ(timerIrq);
return timer;
} while(0);
if (timer)
{
rt_free(timer);
}
rt_kprintf("TIMER: Init failed!\n");
return RT_NULL;
}
/***************************************************************************//**
* @brief
* Initialize all Timer module related hardware and register Timer device to
* kernel
*
* @details
*
* @note
******************************************************************************/
void rt_hw_timer_init(void)
{
struct efm32_timer_device_t *timer;
#ifdef RT_USING_TIMER0
if ((timer = rt_hw_timer_unit_init(&timer0_device, 0, RT_USING_TIMER0)) \
!= RT_NULL)
{
rt_hw_timer_register(&timer0_device, RT_TIMER0_NAME, 0, timer);
}
#endif
#ifdef RT_USING_TIMER1
if ((timer = rt_hw_timer_unit_init(&timer1_device, 1, RT_USING_TIMER1)) \
!= RT_NULL)
{
rt_hw_timer_register(&timer1_device, RT_TIMER1_NAME, 0, timer);
}
#endif
#ifdef RT_USING_TIMER2
if ((timer = rt_hw_timer_unit_init(&timer2_device, 2, RT_USING_TIMER2)) \
!= RT_NULL)
{
rt_hw_timer_register(&timer2_device, RT_TIMER2_NAME, 0, timer);
}
#endif
}
#endif
/***************************************************************************//**
* @}
******************************************************************************/
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