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Diff: targets/cmsis/TARGET_NUVOTON/TARGET_NUC472/StdDriver/nuc472_timer.c
- Revision:
- 144:ef7eb2e8f9f7
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/cmsis/TARGET_NUVOTON/TARGET_NUC472/StdDriver/nuc472_timer.c Fri Sep 02 15:07:44 2016 +0100 @@ -0,0 +1,229 @@ +/**************************************************************************//** + * @file timer.c + * @version V1.00 + * $Revision: 6 $ + * $Date: 14/05/29 1:13p $ + * @brief NUC472/NUC442 TIMER driver source file + * + * @note + * Copyright (C) 2013 Nuvoton Technology Corp. All rights reserved. +*****************************************************************************/ +#include "NUC472_442.h" + +/** @addtogroup NUC472_442_Device_Driver NUC472/NUC442 Device Driver + @{ +*/ + +/** @addtogroup NUC472_442_TIMER_Driver TIMER Driver + @{ +*/ + + +/** @addtogroup NUC472_442_TIMER_EXPORTED_FUNCTIONS TIMER 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 The base address of Timer module + * @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 + * @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 >= 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; + } + + timer->CTL = u32Mode | u32Prescale; + timer->CMP = u32Cmpr; + + return(u32Clk / (u32Cmpr * (u32Prescale + 1))); +} + +/** + * @brief This API stops Timer counting and disable the Timer interrupt function + * @param[in] timer The base address of Timer module + * @return None + */ +void TIMER_Close(TIMER_T *timer) +{ + timer->CTL = 0; + timer->EXTCTL = 0; + +} + +/** + * @brief This API is used to create a delay loop for u32usec micro seconds + * @param[in] timer The base address of Timer module + * @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 TIMER_Delay(TIMER_T *timer, uint32_t u32Usec) +{ + uint32_t u32Clk = TIMER_GetModuleClock(timer); + uint32_t u32Prescale = 0, delay = SystemCoreClock / u32Clk + 1; + double fCmpr; + + // Clear current timer configuration + timer->CTL = 0; + timer->EXTCTL = 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 uint32_t + fCmpr = ((double)u32Usec * (double)u32Clk) / 1000000.0; + + timer->CMP = (uint32_t)fCmpr; + timer->CTL = TIMER_CTL_CNTEN_Msk | u32Prescale; // one shot mode + + // 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 This API is used to enable timer capture function with specified mode and capture edge + * @param[in] timer The base address of Timer module + * @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 edge. Possible values are + * - \ref TIMER_CAPTURE_FALLING_EDGE + * - \ref TIMER_CAPTURE_RISING_EDGE + * - \ref TIMER_CAPTURE_FALLING_THEN_RISING_EDGE + * - \ref TIMER_CAPTURE_RISING_THEN_FALLING_EDGE + * @return None + * @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 This API is used to disable the Timer capture function + * @param[in] timer The base address of Timer module + * @return None + */ +void TIMER_DisableCapture(TIMER_T *timer) +{ + timer->EXTCTL &= ~TIMER_EXTCTL_CAPEN_Msk; + +} + +/** + * @brief This function is used to enable the Timer counter function with specify detection edge + * @param[in] timer The base address of Timer module + * @param[in] u32Edge Detection edge of counter pin. Could be ether + * - \ref TIMER_COUNTER_RISING_EDGE, or + * - \ref TIMER_COUNTER_FALLING_EDGE + * @return None + * @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 This API is used to disable the Timer event counter function. + * @param[in] timer The base address of Timer module + * @return None + */ +void TIMER_DisableEventCounter(TIMER_T *timer) +{ + timer->CTL &= ~TIMER_CTL_EXTCNTEN_Msk; +} + +/** + * @brief This API is used to get the clock frequency of Timer + * @param[in] timer The base address of Timer module + * @return Timer clock frequency + * @note This API cannot return correct clock rate if timer source is 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) { + if(CLK->CLKSEL0 & CLK_CLKSEL0_PCLKSEL_Msk) + return(SystemCoreClock / 2); + else + return(SystemCoreClock); + } + + return(au32Clk[u32Src]); + +} + +/*@}*/ /* end of group NUC472_442_TIMER_EXPORTED_FUNCTIONS */ + +/*@}*/ /* end of group NUC472_442_TIMER_Driver */ + +/*@}*/ /* end of group NUC472_442_Device_Driver */ + +/*** (C) COPYRIGHT 2013 Nuvoton Technology Corp. ***/