Mouse code for the MacroRat
mbed-dev/targets/TARGET_ARM_SSG/TARGET_BEETLE/device/apb_timer.c
- Committer:
- sahilmgandhi
- Date:
- 2017-05-14
- Revision:
- 18:6a4db94011d3
File content as of revision 18:6a4db94011d3:
/* mbed Microcontroller Library * Copyright (c) 2016 ARM Limited * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "cmsis.h" #include "apb_timer.h" /* Timer Private Data */ typedef struct { /* Timer Definition */ CMSDK_TIMER_TypeDef *timerN; /* Timer IRQn */ uint32_t timerIRQn; /* Timer Reload Value */ uint32_t timerReload; /* Timer state */ uint32_t state; } apb_timer_t; /* Timer state definitions */ #define TIMER_INITIALIZED (1) #define TIMER_ENABLED (1 << 1) /* * This Timer is written for MBED OS and keeps count * of the ticks. All the elaboration logic is demanded * to the upper layers. */ #define TIMER_MAX_VALUE 0xFFFFFFFF #define TIMER_TICKS_US (SystemCoreClock/1000000) /* Timers Array */ static apb_timer_t Timers[NUM_TIMERS]; void Timer_Index_Init(uint32_t timer, uint32_t reload, CMSDK_TIMER_TypeDef *TimerN, uint32_t IRQn) { Timers[timer].timerN = TimerN; Timers[timer].timerIRQn = IRQn; Timers[timer].timerReload = reload; Timers[timer].state = TIMER_INITIALIZED; } /* * Timer_Initialize(): Initializes an hardware timer * timer: timer to be Initialized * time_us: timer reload value in us - 0 to reload to timer max value * time_us = tick_value / TIMER_TICKS_US */ #define TIMER_INIT(index, reload) Timer_Index_Init(index, reload, CMSDK_TIMER##index, TIMER##index##_IRQn) void Timer_Initialize(uint32_t timer, uint32_t time_us) { uint32_t reload = 0; if (timer < NUM_TIMERS) { if (time_us == 0) reload = TIMER_MAX_VALUE; else reload = (time_us) * TIMER_TICKS_US; switch(timer) { case 0: TIMER_INIT(0, reload); break; case 1: TIMER_INIT(1, reload); break; default: break; } } } /* * Timer_Enable(): Enables a hardware timer * timer: timer to be enabled */ void Timer_Enable(uint32_t timer) { /* The timer has to be contained in a valid range */ if (timer < NUM_TIMERS) { /* Timer has to be already initialized */ if (Timers[timer].state == TIMER_INITIALIZED) { /* Disable Timer */ (Timers[timer].timerN)->CTRL = 0x0; /* Reload Value */ (Timers[timer].timerN)->RELOAD = Timers[timer].timerReload; /* Enable Interrupt */ (Timers[timer].timerN)->CTRL = CMSDK_TIMER_CTRL_IRQEN_Msk; /* Enable Counter */ (Timers[timer].timerN)->CTRL |= CMSDK_TIMER_CTRL_EN_Msk; /* Change timer state */ Timers[timer].state |= TIMER_ENABLED; } } } /* * Timer_Disable(): Disables a hardware timer * timer: timer to be disabled */ void Timer_Disable(uint32_t timer) { /* The timer has to be contained in a valid range */ if (timer < NUM_TIMERS) { /* Timer has to be already initialized and enabled */ if (Timers[timer].state == (TIMER_INITIALIZED | TIMER_ENABLED)) { /* Disable Timer */ (Timers[timer].timerN)->CTRL = 0x0; /* Change timer state */ Timers[timer].state = TIMER_INITIALIZED; } } } /* * Timer_isEnabled(): verifies if a timer is enabled * timer: timer to be verified * @return: 0 disabled - 1 enabled */ uint32_t Timer_isEnabled(uint32_t timer) { /* The timer has to be contained in a valid range */ if (timer < NUM_TIMERS) { /* Timer has to be already initialized and enabled */ if (Timers[timer].state == (TIMER_INITIALIZED | TIMER_ENABLED)) return 1; } else { return 0; } return 0; } /* * Timer_Read(): provides timer VALUE * timer: timer to be read * @return: timer VALUE us */ uint32_t Timer_Read(uint32_t timer) { uint32_t return_value = 0; /* Verify if the Timer is enabled */ if (Timer_isEnabled(timer) == 1) { return_value = (Timers[timer].timerReload - (Timers[timer].timerN)->VALUE) / TIMER_TICKS_US; } return return_value; } /* * Timer_SetInterrupt(): sets timer Interrupt * timer: timer on which interrupt is set * time_us: reloading time in us */ void Timer_SetInterrupt(uint32_t timer, uint32_t time_us) { uint32_t load_time_us = 0; /* Verify if the Timer is enabled */ if (Timer_isEnabled(timer) == 1) { /* Disable Timer */ Timer_Disable(timer); /* Enable Interrupt */ (Timers[timer].timerN)->CTRL = CMSDK_TIMER_CTRL_IRQEN_Msk; /* Check time us condition */ if(time_us == TIMER_DEFAULT_RELOAD) load_time_us = TIMER_MAX_VALUE; else load_time_us = time_us * TIMER_TICKS_US; /* Initialize Timer Value */ Timers[timer].timerReload = load_time_us; (Timers[timer].timerN)->RELOAD = Timers[timer].timerReload; (Timers[timer].timerN)->VALUE = Timers[timer].timerReload; /* Enable Counter */ (Timers[timer].timerN)->CTRL |= CMSDK_TIMER_CTRL_EN_Msk; /* Change timer state */ Timers[timer].state |= TIMER_ENABLED; } } /* * Timer_DisableInterrupt(): disables timer interrupt * timer: timer on which interrupt is disabled */ void Timer_DisableInterrupt(uint32_t timer) { /* Verify if the Timer is enabled */ if (Timer_isEnabled(timer) == 1) { /* Disable Interrupt */ (Timers[timer].timerN)->CTRL &= CMSDK_TIMER_CTRL_EN_Msk; } } /* * Timer_ClearInterrupt(): clear timer interrupt * timer: timer on which interrupt needs to be cleared */ void Timer_ClearInterrupt(uint32_t timer) { /* Verify if the Timer is enabled */ if (Timer_isEnabled(timer) == 1) { /* Clear Interrupt */ (Timers[timer].timerN)->INTCLEAR = CMSDK_TIMER_INTCLEAR_Msk; } } /* * Timer_GetIRQn(): returns IRQn of a Timer * timer: timer on which IRQn is defined - 0 if it is not defined */ uint32_t Timer_GetIRQn(uint32_t timer) { /* Verify if the Timer is enabled */ if (Timer_isEnabled(timer) == 1) { return Timers[timer].timerIRQn; } return 0; } /* * Timer_GetTicksUS(): returns the number of Ticks per us * timer: timer associated with the Ticks per us * @return: Ticks per us - 0 if the timer is disables */ uint32_t Timer_GetTicksUS(uint32_t timer) { /* Verify if the Timer is enabled */ if (Timer_isEnabled(timer) == 1) { return TIMER_TICKS_US; } return 0; } /* * Timer_GetReloadValue(): returns the load value of the selected * timer. * timer: timer associated with the Ticks per us * @return: reload value of the selected singletimer */ uint32_t Timer_GetReloadValue(uint32_t timer) { /* Verify if the Timer is enabled */ if (Timer_isEnabled(timer) == 1) { if (timer == TIMER1) return Timers[timer].timerReload / TIMER_TICKS_US; else return Timers[timer].timerReload / TIMER_TICKS_US; } return 0; }