Mouse code for the MacroRat
Diff: mbed-dev/targets/TARGET_NUVOTON/TARGET_M451/device/StdDriver/m451_timer.c
- Revision:
- 18:6a4db94011d3
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/mbed-dev/targets/TARGET_NUVOTON/TARGET_M451/device/StdDriver/m451_timer.c Sun May 14 23:18:57 2017 +0000 @@ -0,0 +1,292 @@ +/**************************************************************************//** + * @file timer.c + * @version V3.00 + * $Revision: 6 $ + * $Date: 15/08/11 10:26a $ + * @brief M451 series Timer driver source file + * + * @note + * Copyright (C) 2013~2015 Nuvoton Technology Corp. All rights reserved. +*****************************************************************************/ +#include "M451Series.h" + + +/** @addtogroup Standard_Driver Standard Driver + @{ +*/ + +/** @addtogroup TIMER_Driver TIMER Driver + @{ +*/ + +/** @addtogroup TIMER_EXPORTED_FUNCTIONS TIMER Exported Functions + @{ +*/ + +/** + * @brief Open Timer with Operate Mode and Frequency + * + * @param[in] timer The pointer of the specified Timer module. It could be TIMER0, TIMER1, TIMER2, TIMER3. + * @param[in] u32Mode Operation mode. Possible options are + * - \ref TIMER_ONESHOT_MODE + * - \ref TIMER_PERIODIC_MODE + * - \ref TIMER_TOGGLE_MODE + * - \ref TIMER_CONTINUOUS_MODE + * @param[in] u32Freq Target working frequency + * + * @return Real timer working frequency + * + * @details 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. + * @note After calling this API, Timer is \b NOT running yet. But could start timer running be calling + * \ref TIMER_Start macro or program registers directly. + */ +uint32_t TIMER_Open(TIMER_T *timer, uint32_t u32Mode, uint32_t u32Freq) +{ + uint32_t u32Clk = TIMER_GetModuleClock(timer); + uint32_t 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 > 64000000) + { + u32Prescale = 7; // real prescaler value is 8 + u32Clk >>= 3; + } + else if(u32Clk > 32000000) + { + u32Prescale = 3; // real prescaler value is 4 + u32Clk >>= 2; + } + else if(u32Clk > 16000000) + { + u32Prescale = 1; // real prescaler value is 2 + u32Clk >>= 1; + } + + u32Cmpr = u32Clk / u32Freq; + } + + timer->CTL = u32Mode | u32Prescale; + timer->CMP = u32Cmpr; + + return(u32Clk / (u32Cmpr * (u32Prescale + 1))); +} + +/** + * @brief Stop Timer Counting + * + * @param[in] timer The pointer of the specified Timer module. It could be TIMER0, TIMER1, TIMER2, TIMER3. + * + * @return None + * + * @details This API stops timer counting and disable all timer interrupt function. + */ +void TIMER_Close(TIMER_T *timer) +{ + timer->CTL = 0; + timer->EXTCTL = 0; +} + +/** + * @brief Create a specify Delay Time + * + * @param[in] timer The pointer of the specified Timer module. It could be TIMER0, TIMER1, TIMER2, TIMER3. + * @param[in] u32Usec Delay period in micro seconds. Valid values are between 100~1000000 (100 micro second ~ 1 second). + * + * @return None + * + * @details This API is used to create a delay loop for u32usec micro seconds by using timer one-shot mode. + * @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 TIMER_Delay(TIMER_T *timer, uint32_t u32Usec) +{ + uint32_t u32Clk = TIMER_GetModuleClock(timer); + uint32_t u32Prescale = 0, delay = (SystemCoreClock / u32Clk) + 1; + uint32_t u32Cmpr, u32NsecPerTick; + + // Clear current timer configuration/ + timer->CTL = 0; + timer->EXTCTL = 0; + + if(u32Clk <= 1000000) // min delay is 1000 us if timer clock source is <= 1 MHz + { + if(u32Usec < 1000) + u32Usec = 1000; + if(u32Usec > 1000000) + u32Usec = 1000000; + } + else + { + if(u32Usec < 100) + u32Usec = 100; + if(u32Usec > 1000000) + u32Usec = 1000000; + } + + if(u32Clk <= 1000000) + { + u32Prescale = 0; + u32NsecPerTick = 1000000000 / u32Clk; + u32Cmpr = (u32Usec * 1000) / u32NsecPerTick; + } + else + { + if(u32Clk > 64000000) + { + u32Prescale = 7; // real prescaler value is 8 + u32Clk >>= 3; + } + else if(u32Clk > 32000000) + { + u32Prescale = 3; // real prescaler value is 4 + u32Clk >>= 2; + } + else if(u32Clk > 16000000) + { + u32Prescale = 1; // real prescaler value is 2 + u32Clk >>= 1; + } + + if(u32Usec < 250) + { + u32Cmpr = (u32Usec * u32Clk) / 1000000; + } + else + { + u32NsecPerTick = 1000000000 / u32Clk; + u32Cmpr = (u32Usec * 1000) / u32NsecPerTick; + } + } + + timer->CMP = u32Cmpr; + timer->CTL = TIMER_CTL_CNTEN_Msk | TIMER_ONESHOT_MODE | u32Prescale; + + // 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--) + { + __NOP(); + } + + while(timer->CTL & TIMER_CTL_ACTSTS_Msk); +} + +/** + * @brief Enable Timer Capture Function + * + * @param[in] timer The pointer of the specified Timer module. It could be TIMER0, TIMER1, TIMER2, TIMER3. + * @param[in] u32CapMode Timer capture mode. Could be + * - \ref TIMER_CAPTURE_FREE_COUNTING_MODE + * - \ref TIMER_CAPTURE_COUNTER_RESET_MODE + * @param[in] u32Edge Timer capture trigger edge. Possible values are + * - \ref TIMER_CAPTURE_FALLING_EDGE + * - \ref TIMER_CAPTURE_RISING_EDGE + * - \ref TIMER_CAPTURE_FALLING_AND_RISING_EDGE + * + * @return None + * + * @details This API is used to enable timer capture function with specify capture trigger edge \n + * to get current counter value or reset counter value to 0. + * @note Timer frequency should be configured separately by using \ref TIMER_Open API, or program registers directly. + */ +void TIMER_EnableCapture(TIMER_T *timer, uint32_t u32CapMode, uint32_t u32Edge) +{ + + timer->EXTCTL = (timer->EXTCTL & ~(TIMER_EXTCTL_CAPFUNCS_Msk | TIMER_EXTCTL_CAPEDGE_Msk)) | + u32CapMode | u32Edge | TIMER_EXTCTL_CAPEN_Msk; +} + +/** + * @brief Disable Timer Capture Function + * + * @param[in] timer The pointer of the specified Timer module. It could be TIMER0, TIMER1, TIMER2, TIMER3. + * + * @return None + * + * @details This API is used to disable the timer capture function. + */ +void TIMER_DisableCapture(TIMER_T *timer) +{ + timer->EXTCTL &= ~TIMER_EXTCTL_CAPEN_Msk; +} + +/** + * @brief Enable Timer Counter Function + * + * @param[in] timer The pointer of the specified Timer module. It could be TIMER0, TIMER1, TIMER2, TIMER3. + * @param[in] u32Edge Detection edge of counter pin. Could be ether + * - \ref TIMER_COUNTER_FALLING_EDGE, or + * - \ref TIMER_COUNTER_RISING_EDGE + * + * @return None + * + * @details This function is used to enable the timer counter function with specify detection edge. + * @note Timer compare value should be configured separately by using \ref TIMER_SET_CMP_VALUE macro or program registers directly. + * @note While using event counter function, \ref TIMER_TOGGLE_MODE cannot set as timer operation mode. + */ +void TIMER_EnableEventCounter(TIMER_T *timer, uint32_t u32Edge) +{ + timer->EXTCTL = (timer->EXTCTL & ~TIMER_EXTCTL_CNTPHASE_Msk) | u32Edge; + timer->CTL |= TIMER_CTL_EXTCNTEN_Msk; +} + +/** + * @brief Disable Timer Counter Function + * + * @param[in] timer The pointer of the specified Timer module. It could be TIMER0, TIMER1, TIMER2, TIMER3. + * + * @return None + * + * @details This API is used to disable the timer event counter function. + */ +void TIMER_DisableEventCounter(TIMER_T *timer) +{ + timer->CTL &= ~TIMER_CTL_EXTCNTEN_Msk; +} + +/** + * @brief Get Timer Clock Frequency + * + * @param[in] timer The pointer of the specified Timer module. It could be TIMER0, TIMER1, TIMER2, TIMER3. + * + * @return Timer clock frequency + * + * @details This API is used to get the timer clock frequency. + * @note This API cannot return correct clock rate if timer source is from external clock input. + */ +uint32_t TIMER_GetModuleClock(TIMER_T *timer) +{ + uint32_t u32Src; + const uint32_t au32Clk[] = {__HXT, __LXT, 0, 0, 0, __LIRC, 0, __HIRC}; + + if(timer == TIMER0) + u32Src = (CLK->CLKSEL1 & CLK_CLKSEL1_TMR0SEL_Msk) >> CLK_CLKSEL1_TMR0SEL_Pos; + else if(timer == TIMER1) + u32Src = (CLK->CLKSEL1 & CLK_CLKSEL1_TMR1SEL_Msk) >> CLK_CLKSEL1_TMR1SEL_Pos; + else if(timer == TIMER2) + u32Src = (CLK->CLKSEL1 & CLK_CLKSEL1_TMR2SEL_Msk) >> CLK_CLKSEL1_TMR2SEL_Pos; + else // Timer 3 + u32Src = (CLK->CLKSEL1 & CLK_CLKSEL1_TMR3SEL_Msk) >> CLK_CLKSEL1_TMR3SEL_Pos; + + if(u32Src == 2) + { + return (SystemCoreClock); + } + + return (au32Clk[u32Src]); +} + +/*@}*/ /* end of group TIMER_EXPORTED_FUNCTIONS */ + +/*@}*/ /* end of group TIMER_Driver */ + +/*@}*/ /* end of group Standard_Driver */ + +/*** (C) COPYRIGHT 2013~2015 Nuvoton Technology Corp. ***/