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rt-thread-official/bsp/nuvoton/libraries/n9h30/Driver/Source/nu_etimer.c

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/**************************************************************************//**
* @file etimer.c
* @brief N9H30 series ETIMER driver source file
*
* @note
* SPDX-License-Identifier: Apache-2.0
* Copyright (C) 2018 Nuvoton Technology Corp. All rights reserved.
*****************************************************************************/
#include "N9H30.h"
#include "nu_sys.h"
/// @cond HIDDEN_SYMBOLS
/**
* @brief This API is used to get the clock frequency of Timer
* @param[in] timer ETIMER number. Range from 0 ~ 3
* @return Timer clock frequency
* @note This API cannot return correct clock rate if timer source is external clock input.
*/
UINT ETIMER_GetModuleClock(UINT timer)
{
UINT src;
src = (inpw(REG_CLK_DIVCTL8) >> (16 + timer * 4)) & 0x3;
if (src == 0)
return 12000000;
else if (src == 1)
return (sysGetClock(SYS_PCLK) * 1000000);
else if (src == 2)
return (sysGetClock(SYS_PCLK) * 1000000 / 4096);
else
return 32768;
}
/// @endcond /* HIDDEN_SYMBOLS */
/** @addtogroup N9H30_Device_Driver N9H30 Device Driver
@{
*/
/** @addtogroup N9H30_ETIMER_Driver ETIMER Driver
@{
*/
/** @addtogroup N9H30_ETIMER_EXPORTED_FUNCTIONS ETIMER Exported Functions
@{
*/
/**
* @brief This API is used to configure timer to operate in specified mode
* and frequency. If timer cannot work in target frequency, a closest
* frequency will be chose and returned.
* @param[in] timer ETIMER number. Range from 0 ~ 3
* @param[in] u32Mode Operation mode. Possible options are
* - \ref ETIMER_ONESHOT_MODE
* - \ref ETIMER_PERIODIC_MODE
* - \ref ETIMER_TOGGLE_MODE
* - \ref ETIMER_CONTINUOUS_MODE
* @param[in] u32Freq Target working frequency
* @return Real Timer working frequency
* @note After calling this API, Timer is \b NOT running yet. But could start timer running be calling
* \ref ETIMER_Start macro or program registers directly
*/
UINT ETIMER_Open(UINT timer, UINT u32Mode, UINT u32Freq)
{
UINT u32Clk = ETIMER_GetModuleClock(timer);
UINT u32Cmpr = 0, u32Prescale = 0;
// Fastest possible timer working freq is u32Clk / 2. While cmpr = 2, pre-scale = 0
if (u32Freq > (u32Clk / 2))
{
u32Cmpr = 2;
}
else
{
if (u32Clk >= 0x4000000)
{
u32Prescale = 7; // real prescaler value is 8
u32Clk >>= 3;
}
else if (u32Clk >= 0x2000000)
{
u32Prescale = 3; // real prescaler value is 4
u32Clk >>= 2;
}
else if (u32Clk >= 0x1000000)
{
u32Prescale = 1; // real prescaler value is 2
u32Clk >>= 1;
}
u32Cmpr = u32Clk / u32Freq;
}
if (timer == 0)
{
outpw(REG_ETMR0_CMPR, u32Cmpr);
outpw(REG_ETMR0_PRECNT, u32Prescale);
outpw(REG_ETMR0_CTL, 1 | u32Mode);
}
else if (timer == 1)
{
outpw(REG_ETMR1_CMPR, u32Cmpr);
outpw(REG_ETMR1_PRECNT, u32Prescale);
outpw(REG_ETMR1_CTL, 1 | u32Mode);
}
else if (timer == 2)
{
outpw(REG_ETMR2_CMPR, u32Cmpr);
outpw(REG_ETMR2_PRECNT, u32Prescale);
outpw(REG_ETMR2_CTL, 1 | u32Mode);
}
else
{
outpw(REG_ETMR3_CMPR, u32Cmpr);
outpw(REG_ETMR3_PRECNT, u32Prescale);
outpw(REG_ETMR3_CTL, 1 | u32Mode);
}
return (u32Clk / (u32Cmpr * (u32Prescale + 1)));
}
/**
* @brief This API stops Timer counting and disable the Timer interrupt function
* @param[in] timer ETIMER number. Range from 0 ~ 3
* @return None
*/
void ETIMER_Close(UINT timer)
{
if (timer == 0)
{
outpw(REG_ETMR0_CTL, 0);
outpw(REG_ETMR0_IER, 0);
}
else if (timer == 1)
{
outpw(REG_ETMR1_CTL, 0);
outpw(REG_ETMR1_IER, 0);
}
else if (timer == 2)
{
outpw(REG_ETMR2_CTL, 0);
outpw(REG_ETMR2_IER, 0);
}
else
{
outpw(REG_ETMR3_CTL, 0);
outpw(REG_ETMR3_IER, 0);
}
}
/**
* @brief This API is used to create a delay loop for u32usec micro seconds
* @param[in] timer ETIMER number. Range from 0 ~ 3
* @param[in] u32Usec Delay period in micro seconds with 10 usec every step. Valid values are between 10~1000000 (10 micro second ~ 1 second)
* @return None
* @note This API overwrites the register setting of the timer used to count the delay time.
* @note This API use polling mode. So there is no need to enable interrupt for the timer module used to generate delay
*/
void ETIMER_Delay(UINT timer, UINT u32Usec)
{
UINT u32Clk = ETIMER_GetModuleClock(timer);
UINT u32Prescale = 0, delay = 300000000 / u32Clk;
float fCmpr;
// Clear current timer configuration
if (timer == 0)
{
outpw(REG_ETMR0_CTL, 0);
}
else if (timer == 1)
{
outpw(REG_ETMR1_CTL, 0);
}
else if (timer == 2)
{
outpw(REG_ETMR2_CTL, 0);
}
else
{
outpw(REG_ETMR3_CTL, 0);
}
if (u32Clk == 10000) // min delay is 100us if timer clock source is LIRC 10k
{
u32Usec = ((u32Usec + 99) / 100) * 100;
}
else // 10 usec every step
{
u32Usec = ((u32Usec + 9) / 10) * 10;
}
if (u32Clk >= 0x4000000)
{
u32Prescale = 7; // real prescaler value is 8
u32Clk >>= 3;
}
else if (u32Clk >= 0x2000000)
{
u32Prescale = 3; // real prescaler value is 4
u32Clk >>= 2;
}
else if (u32Clk >= 0x1000000)
{
u32Prescale = 1; // real prescaler value is 2
u32Clk >>= 1;
}
// u32Usec * u32Clk might overflow if using UINT
fCmpr = ((float)u32Usec * (float)u32Clk) / 1000000.0;
if (timer == 0)
{
outpw(REG_ETMR0_CMPR, (UINT)fCmpr);
outpw(REG_ETMR0_PRECNT, u32Prescale);
outpw(REG_ETMR0_CTL, 1);
}
else if (timer == 1)
{
outpw(REG_ETMR1_CMPR, (UINT)fCmpr);
outpw(REG_ETMR1_PRECNT, u32Prescale);
outpw(REG_ETMR1_CTL, 1);
}
else if (timer == 2)
{
outpw(REG_ETMR2_CMPR, (UINT)fCmpr);
outpw(REG_ETMR2_PRECNT, u32Prescale);
outpw(REG_ETMR2_CTL, 1);
}
else
{
outpw(REG_ETMR3_CMPR, (UINT)fCmpr);
outpw(REG_ETMR3_PRECNT, u32Prescale);
outpw(REG_ETMR3_CTL, 1);
}
// When system clock is faster than timer clock, it is possible timer active bit cannot set in time while we check it.
// And the while loop below return immediately, so put a tiny delay here allowing timer start counting and raise active flag.
for (; delay > 0; delay--)
{
#if defined (__GNUC__) && !(__CC_ARM)
__asm__ __volatile__
(
"nop \n"
);
#else
__asm
{
NOP
}
#endif
}
if (timer == 0)
{
while (inpw(REG_ETMR0_CTL) & 0x80);
}
else if (timer == 1)
{
while (inpw(REG_ETMR1_CTL) & 0x80);
}
else if (timer == 2)
{
while (inpw(REG_ETMR2_CTL) & 0x80);
}
else
{
while (inpw(REG_ETMR3_CTL) & 0x80);
}
}
/**
* @brief This API is used to enable timer capture function with specified mode and capture edge
* @param[in] timer ETIMER number. Range from 0 ~ 3
* @param[in] u32CapMode Timer capture mode. Could be
* - \ref ETIMER_CAPTURE_FREE_COUNTING_MODE
* - \ref ETIMER_CAPTURE_TRIGGER_COUNTING_MODE
* - \ref ETIMER_CAPTURE_COUNTER_RESET_MODE
* @param[in] u32Edge Timer capture edge. Possible values are
* - \ref ETIMER_CAPTURE_FALLING_EDGE
* - \ref ETIMER_CAPTURE_RISING_EDGE
* - \ref ETIMER_CAPTURE_FALLING_THEN_RISING_EDGE
* - \ref ETIMER_CAPTURE_RISING_THEN_FALLING_EDGE
* @return None
* @note Timer frequency should be configured separately by using \ref ETIMER_Open API, or program registers directly
*/
void ETIMER_EnableCapture(UINT timer, UINT u32CapMode, UINT u32Edge)
{
if (timer == 0)
{
outpw(REG_ETMR0_CTL, (inpw(REG_ETMR0_CTL) & ~0x1E0000) | u32CapMode | u32Edge | 0x10000);
}
else if (timer == 1)
{
outpw(REG_ETMR1_CTL, (inpw(REG_ETMR1_CTL) & ~0x1E0000) | u32CapMode | u32Edge | 0x10000);
}
else if (timer == 2)
{
outpw(REG_ETMR2_CTL, (inpw(REG_ETMR2_CTL) & ~0x1E0000) | u32CapMode | u32Edge | 0x10000);
}
else
{
outpw(REG_ETMR3_CTL, (inpw(REG_ETMR3_CTL) & ~0x1E0000) | u32CapMode | u32Edge | 0x10000);
}
}
/**
* @brief This API is used to disable the Timer capture function
* @param[in] timer ETIMER number. Range from 0 ~ 3
* @return None
*/
void ETIMER_DisableCapture(UINT timer)
{
if (timer == 0)
{
outpw(REG_ETMR0_CTL, inpw(REG_ETMR0_CTL) & ~0x10000);
}
else if (timer == 1)
{
outpw(REG_ETMR1_CTL, inpw(REG_ETMR1_CTL) & ~0x10000);
}
else if (timer == 2)
{
outpw(REG_ETMR2_CTL, inpw(REG_ETMR2_CTL) & ~0x10000);
}
else
{
outpw(REG_ETMR3_CTL, inpw(REG_ETMR3_CTL) & ~0x10000);
}
}
/*@}*/ /* end of group N9H30_ETIMER_EXPORTED_FUNCTIONS */
/*@}*/ /* end of group N9H30_ETIMER_Driver */
/*@}*/ /* end of group N9H30_Device_Driver */
/*** (C) COPYRIGHT 2018 Nuvoton Technology Corp. ***/
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