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/**************************************************************************//**
*
* @copyright (C) 2020 Nuvoton Technology Corp. All rights reserved.
*
* SPDX-License-Identifier: Apache-2.0
*
* Change Logs:
* Date Author Notes
* 2021-1-28 Wayne First version
*
******************************************************************************/
#include <rtconfig.h>
#if defined(BSP_USING_TIMER_CAPTURE)
#include <rtdevice.h>
#include "NuMicro.h"
#include <drv_sys.h>
/* Private define ---------------------------------------------------------------*/
/* Timer prescale setting. Since it will affect the pulse width of measure, it is recommended to set to 2. */
#define PSC_DIV (2)
#define NU_TCAP_DEVICE(etimer) (nu_capture_t*)(etimer)
enum
{
TCAP_START = -1,
#if defined(BSP_USING_TIMER0_CAPTURE)
TCAP0_IDX,
#endif
#if defined(BSP_USING_TIMER1_CAPTURE)
TCAP1_IDX,
#endif
#if defined(BSP_USING_TIMER2_CAPTURE)
TCAP2_IDX,
#endif
#if defined(BSP_USING_TIMER3_CAPTURE)
TCAP3_IDX,
#endif
#if defined(BSP_USING_TIMER4_CAPTURE)
TCAP4_IDX,
#endif
/* BSP_USING_TIMER5 is reserved for Systick usage. */
TCAP_CNT
};
/* Private typedef --------------------------------------------------------------*/
typedef struct _timer
{
struct rt_inputcapture_device parent;
char *name;
uint32_t idx;
IRQn_Type irqn;
E_SYS_IPRST rstidx;
E_SYS_IPCLK clkidx;
uint32_t u32CurrentCnt;
} 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);
/* Public functions -------------------------------------------------------------*/
/* Private variables ------------------------------------------------------------*/
static nu_capture_t nu_etcap_arr [] =
{
#if defined(BSP_USING_TIMER0_CAPTURE)
{
.name = "timer0i0",
.idx = 0,
.irqn = IRQ_TIMER0,
.rstidx = TIMER0RST,
.clkidx = TIMER0CKEN,
},
#endif
#if defined(BSP_USING_TIMER1_CAPTURE)
{
.name = "timer1i0",
.idx = 1,
.irqn = IRQ_TIMER1,
.rstidx = TIMER1RST,
.clkidx = TIMER1CKEN,
},
#endif
#if defined(BSP_USING_TIMER2_CAPTURE)
{
.name = "timer2i0",
.idx = 2,
.irqn = IRQ_TIMER2,
.rstidx = TIMER2RST,
.clkidx = TIMER2CKEN,
},
#endif
#if defined(BSP_USING_TIMER3_CAPTURE)
{
.name = "timer3i0",
.idx = 3,
.irqn = IRQ_TIMER3,
.rstidx = TIMER3RST,
.clkidx = TIMER3CKEN,
},
#endif
#if defined(BSP_USING_TIMER4_CAPTURE)
{
.name = "timer4i0",
.idx = 4,
.irqn = IRQ_TIMER4,
.rstidx = TIMER4RST,
.clkidx = TIMER4CKEN,
},
#endif
/* BSP_USING_TIMER5 is reserved for Systick usage. */
};
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 ------------------------------------------------------------*/
static void nu_tcap_isr(int vector, void *param)
{
nu_capture_t *psNuTCap = NU_TCAP_DEVICE(param);
RT_ASSERT(psNuTCap != RT_NULL);
ETIMER_ClearCaptureIntFlag(psNuTCap->idx);
/* Report caputring data and level. */
psNuTCap->u32CurrentCnt = ETIMER_GetCaptureData(psNuTCap->idx);
rt_hw_inputcapture_isr(&psNuTCap->parent, ETIMER_GetCaptureFallingEdgeFlag(psNuTCap->idx));
}
static rt_err_t nu_capture_get_pulsewidth(struct rt_inputcapture_device *inputcapture, rt_uint32_t *pulsewidth_us)
{
nu_capture_t *psNuTCap = NU_TCAP_DEVICE(inputcapture);
RT_ASSERT(inputcapture != RT_NULL);
RT_ASSERT(pulsewidth_us != RT_NULL);
*pulsewidth_us = psNuTCap->u32CurrentCnt / PSC_DIV;
return RT_EOK;
}
static rt_err_t nu_capture_init(struct rt_inputcapture_device *inputcapture)
{
nu_capture_t *psNuTCap = NU_TCAP_DEVICE(inputcapture);
RT_ASSERT(inputcapture != RT_NULL);
nu_sys_ipclk_enable(psNuTCap->clkidx);
nu_sys_ip_reset(psNuTCap->rstidx);
return RT_EOK;
}
static uint8_t cal_time_prescale(nu_capture_t *psNuTCap)
{
uint32_t u32Clk = ETIMER_GetModuleClock(psNuTCap->idx);
/* 1 tick = 1/PSC_DIV us */
return (u32Clk / 1000000 / PSC_DIV) - 1;
}
static rt_err_t nu_capture_open(struct rt_inputcapture_device *inputcapture)
{
nu_capture_t *psNuTCap = NU_TCAP_DEVICE(inputcapture);
RT_ASSERT(inputcapture != RT_NULL);
/* Enable Timer Interrupt */
rt_hw_interrupt_umask(psNuTCap->irqn);
/* Clear counter before openning. */
ETIMER_ClearCounter(psNuTCap->idx);
ETIMER_Open(psNuTCap->idx, ETIMER_CONTINUOUS_MODE, 1);
ETIMER_SET_PRESCALE_VALUE(psNuTCap->idx, cal_time_prescale(psNuTCap));
ETIMER_SET_CMP_VALUE(psNuTCap->idx, 0xFFFFFF);
ETIMER_EnableCapture(psNuTCap->idx, ETIMER_CAPTURE_COUNTER_RESET_MODE, ETIMER_CAPTURE_RISING_THEN_FALLING_EDGE);
ETIMER_EnableCaptureInt(psNuTCap->idx);
ETIMER_Start(psNuTCap->idx);
return RT_EOK;
}
static rt_err_t nu_capture_close(struct rt_inputcapture_device *inputcapture)
{
nu_capture_t *psNuTCap = NU_TCAP_DEVICE(inputcapture);
RT_ASSERT(inputcapture != RT_NULL);
ETIMER_Stop(psNuTCap->idx);
ETIMER_DisableCaptureInt(psNuTCap->idx);
ETIMER_Close(psNuTCap->idx);
rt_hw_interrupt_mask(psNuTCap->irqn);
return RT_EOK;
}
/* Init and register timer capture */
static int nu_timer_capture_device_init(void)
{
int i;
for (i = (TCAP_START + 1); i < TCAP_CNT; i++)
{
/* Register operations */
nu_etcap_arr[i].parent.ops = &nu_capture_ops;
/* Install ISR */
rt_hw_interrupt_install(nu_etcap_arr[i].irqn, nu_tcap_isr, &nu_etcap_arr[i], nu_etcap_arr[i].name);
/* Register inputcapture device */
rt_device_inputcapture_register(&nu_etcap_arr[i].parent, nu_etcap_arr[i].name, &nu_etcap_arr[i]);
}
return 0;
}
INIT_DEVICE_EXPORT(nu_timer_capture_device_init);
#endif //#if defined(BSP_USING_TIMER_CAPTURE)
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