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/**************************************************************************//**
*
* @copyright (C) 2020 Nuvoton Technology Corp. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2020-5-21 Philo First version
*
******************************************************************************/
#include <rtconfig.h>
#if defined(BSP_USING_TIMER_CAPTURE)
#if defined(BSP_USING_TIMER0_CAPTURE)|| \
defined(BSP_USING_TIMER1_CAPTURE)|| \
defined(BSP_USING_TIMER2_CAPTURE)|| \
defined(BSP_USING_TIMER3_CAPTURE)
#include <rtdevice.h>
#include "NuMicro.h"
/* Private typedef --------------------------------------------------------------*/
typedef struct _timer
{
struct rt_inputcapture_device parent;
TIMER_T *timer;
uint8_t u8Channel;
IRQn_Type irq;
uint32_t u32CurrentCnt;
rt_bool_t input_data_level;
rt_bool_t first_edge;
} nu_capture_t;
/* Private functions ------------------------------------------------------------*/
static rt_err_t nu_capture_init(struct rt_inputcapture_device *inputcapture);
static rt_err_t nu_capture_open(struct rt_inputcapture_device *inputcapture);
static rt_err_t nu_capture_close(struct rt_inputcapture_device *inputcapture);
static rt_err_t nu_capture_get_pulsewidth(struct rt_inputcapture_device *inputcapture, rt_uint32_t *pulsewidth_us);
/* Private define ---------------------------------------------------------------*/
#define TIMER_CHANNEL_NUM (4)
#define TIMER0_POS (0)
#define TIMER1_POS (1)
#define TIMER2_POS (2)
#define TIMER3_POS (3)
/* Timer prescale setting. Since it will affect the pulse width of measure, it is recommended to set to 2. */
#define PSC_DIV (2)
/* Public functions -------------------------------------------------------------*/
/* Private variables ------------------------------------------------------------*/
static const char *nu_timer_device_name[TIMER_CHANNEL_NUM] = { "timer0i0", "timer1i0", "timer2i0", "timer3i0"};
static const IRQn_Type nu_timer_irq[TIMER_CHANNEL_NUM] = { TMR0_IRQn, TMR1_IRQn, TMR2_IRQn, TMR3_IRQn};
static TIMER_T *nu_timer_base[TIMER_CHANNEL_NUM] = { TIMER0, TIMER1, TIMER2, TIMER3};
static nu_capture_t *nu_timer_capture[TIMER_CHANNEL_NUM] = {0};
static struct rt_inputcapture_ops nu_capture_ops =
{
.init = nu_capture_init,
.open = nu_capture_open,
.close = nu_capture_close,
.get_pulsewidth = nu_capture_get_pulsewidth,
};
/* Functions define ------------------------------------------------------------*/
void timer_interrupt_handler(nu_capture_t *nu_timer_capture)
{
TIMER_ClearCaptureIntFlag(nu_timer_capture->timer);
/* First event is rising edge */
if (nu_timer_capture->first_edge == RT_TRUE)
{
nu_timer_capture->first_edge = RT_FALSE;
nu_timer_capture->input_data_level = RT_FALSE;
}
else
{
nu_timer_capture->input_data_level = !nu_timer_capture->input_data_level;
nu_timer_capture->u32CurrentCnt = TIMER_GetCaptureData(nu_timer_capture->timer);
rt_hw_inputcapture_isr(&nu_timer_capture->parent, nu_timer_capture->input_data_level);
}
}
#if defined(BSP_USING_TIMER0_CAPTURE)
void TMR0_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
timer_interrupt_handler(nu_timer_capture[0]);
/* leave interrupt */
rt_interrupt_leave();
}
#endif //defined(BSP_USING_TIMER0_CAPTURE)
#if defined(BSP_USING_TIMER1_CAPTURE)
void TMR1_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
timer_interrupt_handler(nu_timer_capture[1]);
/* leave interrupt */
rt_interrupt_leave();
}
#endif //defined(BSP_USING_TIMER1_CAPTURE)
#if defined(BSP_USING_TIMER2_CAPTURE)
void TMR2_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
timer_interrupt_handler(nu_timer_capture[2]);
/* leave interrupt */
rt_interrupt_leave();
}
#endif //defined(BSP_USING_TIMER2_CAPTURE)
#if defined(BSP_USING_TIMER3_CAPTURE)
void TMR3_IRQHandler(void)
{
/* enter interrupt */
rt_interrupt_enter();
timer_interrupt_handler(nu_timer_capture[3]);
/* leave interrupt */
rt_interrupt_leave();
}
#endif //defined(BSP_USING_TIMER3_CAPTURE)
static rt_err_t nu_capture_get_pulsewidth(struct rt_inputcapture_device *inputcapture, rt_uint32_t *pulsewidth_us)
{
rt_err_t ret = RT_EOK;
nu_capture_t *nu_capture;
nu_capture = (nu_capture_t *)inputcapture;
*pulsewidth_us = nu_capture->u32CurrentCnt / PSC_DIV;
return -(ret);
}
static rt_err_t nu_timer_init(nu_capture_t *nu_capture)
{
SYS_UnlockReg();
#if defined(BSP_USING_TIMER0_CAPTURE)
if (nu_capture->timer == TIMER0)
{
/* Enable TIMER0 clock */
CLK_EnableModuleClock(TMR0_MODULE);
CLK_SetModuleClock(TMR0_MODULE, CLK_CLKSEL1_TMR0SEL_PCLK0, 0);
goto exit_nu_timer_init;
}
#endif
#if defined(BSP_USING_TIMER1_CAPTURE)
if (nu_capture->timer == TIMER1)
{
/* Enable TIMER1 clock */
CLK_EnableModuleClock(TMR1_MODULE);
CLK_SetModuleClock(TMR1_MODULE, CLK_CLKSEL1_TMR1SEL_PCLK0, 0);
goto exit_nu_timer_init;
}
#endif
#if defined(BSP_USING_TIMER2_CAPTURE)
if (nu_capture->timer == TIMER2)
{
/* Enable TIMER2 clock */
CLK_EnableModuleClock(TMR2_MODULE);
CLK_SetModuleClock(TMR2_MODULE, CLK_CLKSEL1_TMR2SEL_PCLK1, 0);
goto exit_nu_timer_init;
}
#endif
#if defined(BSP_USING_TIMER3_CAPTURE)
if (nu_capture->timer == TIMER3)
{
/* Enable TIMER3 clock */
CLK_EnableModuleClock(TMR3_MODULE);
CLK_SetModuleClock(TMR3_MODULE, CLK_CLKSEL1_TMR3SEL_PCLK1, 0);
goto exit_nu_timer_init;
}
#endif
SYS_LockReg();
return -(RT_ERROR);
exit_nu_timer_init:
SYS_LockReg();
return RT_EOK;
}
static rt_err_t nu_capture_init(struct rt_inputcapture_device *inputcapture)
{
rt_err_t ret = RT_EOK;
nu_capture_t *nu_capture;
RT_ASSERT(inputcapture != RT_NULL);
nu_capture = (nu_capture_t *) inputcapture;
if (nu_timer_init(nu_capture) != RT_EOK)
{
rt_kprintf("Failed to initialize TIMER.\n");
ret = -RT_ERROR;
}
return -(ret);
}
static uint8_t cal_time_prescale(nu_capture_t *nu_capture)
{
uint32_t u32Clk = TIMER_GetModuleClock(nu_capture->timer);
/* 1 tick = 1/PSC_DIV us */
return (u32Clk / 1000000 / PSC_DIV) - 1;
}
static rt_err_t nu_capture_open(struct rt_inputcapture_device *inputcapture)
{
rt_err_t ret = RT_EOK;
nu_capture_t *nu_capture;
RT_ASSERT(inputcapture != RT_NULL);
nu_capture = (nu_capture_t *) inputcapture;
nu_capture->first_edge = RT_TRUE;
/* Enable Timer NVIC */
NVIC_EnableIRQ(nu_capture->irq);
/* Reset counter before openning. */
TIMER_ResetCounter(nu_capture->timer);
TIMER_Open(nu_capture->timer, TIMER_CONTINUOUS_MODE, 1);
TIMER_SET_PRESCALE_VALUE(nu_capture->timer, cal_time_prescale(nu_capture));
TIMER_SET_CMP_VALUE(nu_capture->timer, 0xFFFFFF);
TIMER_EnableCapture(nu_capture->timer, TIMER_CAPTURE_COUNTER_RESET_MODE, TIMER_CAPTURE_EVENT_RISING_FALLING);
TIMER_EnableInt(nu_capture->timer);
TIMER_EnableCaptureInt(nu_capture->timer);
TIMER_Start(nu_capture->timer);
return ret;
}
static rt_err_t nu_capture_close(struct rt_inputcapture_device *inputcapture)
{
rt_err_t ret = RT_EOK;
nu_capture_t *nu_capture;
RT_ASSERT(inputcapture != RT_NULL);
nu_capture = (nu_capture_t *) inputcapture;
TIMER_Stop(nu_capture->timer);
TIMER_DisableCaptureInt(nu_capture->timer);
TIMER_DisableInt(nu_capture->timer);
TIMER_Close(nu_capture->timer);
NVIC_DisableIRQ(nu_capture->irq);
return ret;
}
/* Init and register timer capture */
static int nu_timer_capture_device_init(void)
{
uint8_t TIMER_MSK = 0;
#if defined(BSP_USING_TIMER0_CAPTURE)
TIMER_MSK |= (0x1 << 0);
#endif
#if defined(BSP_USING_TIMER1_CAPTURE)
TIMER_MSK |= (0x1 << 1);
#endif
#if defined(BSP_USING_TIMER2_CAPTURE)
TIMER_MSK |= (0x1 << 2);
#endif
#if defined(BSP_USING_TIMER3_CAPTURE)
TIMER_MSK |= (0x1 << 3);
#endif
for (int i = 0; i < TIMER_CHANNEL_NUM; i++)
{
if (TIMER_MSK & (0x1 << i))
{
nu_timer_capture[i] = (nu_capture_t *)rt_malloc(sizeof(nu_capture_t));
nu_timer_capture[i]->timer = nu_timer_base[i];
nu_timer_capture[i]->u8Channel = i;
nu_timer_capture[i]->irq = nu_timer_irq[i];
nu_timer_capture[i]->u32CurrentCnt = 0;
nu_timer_capture[i]->parent.ops = &nu_capture_ops;
nu_timer_capture[i]->first_edge = RT_TRUE;
/* register inputcapture device */
rt_device_inputcapture_register(&nu_timer_capture[i]->parent, nu_timer_device_name[i], &nu_timer_capture[i]);
}
}
return 0;
}
INIT_DEVICE_EXPORT(nu_timer_capture_device_init);
#endif //#if defined(BSP_USING_TIMER*_CAPTURE)
#endif //#if defined(BSP_USING_TIMER_CAPTURE)
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