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