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authorbnewbold <bnewbold@robocracy.org>2010-03-31 08:52:45 +0800
committeriperry <iperry@gmail.com>2010-03-31 09:43:10 +0800
commit1d3861ef93f8423176c6010ab606abdab00a7cbd (patch)
tree5c95101e295bcfdd7f9f4292ce9204ddf7e7f662 /src/lib/timers.h
parent8d6bf3b196c2a0bc1adda4a04669e54fdc5b65cb (diff)
downloadlibrambutan-1d3861ef93f8423176c6010ab606abdab00a7cbd.tar.gz
librambutan-1d3861ef93f8423176c6010ab606abdab00a7cbd.zip
Major hierarchy reorganization; see README.
copy-to-ide and Makefile updated to conform; .gitignore added; LICENSE added
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-/* *****************************************************************************
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- *
- * Created: 12/18/09 02:38:10
- * Copyright (c) 2009 Perry L. Hung. All rights reserved.
- *
- * ****************************************************************************/
-
-/**
- * @file timers.h
- *
- * @brief Timer prototypes and various definitions
- */
-
-/* Note to self:
- * The timer clock frequencies are automatically fixed by hardware.
- * There are two cases:
- * 1. if the APB prescaler is 1, the timer clock frequencies are
- * set to the same frequency as that of the APB domain to which
- * the timers are connected.
- * 2. otherwise, they are set to twice (x2) the frequency of the
- * APB domain to which the timers are connected.
- * See stm32 manual, 77/995
- *
- * hence, 72 mhz timers
- * */
-
-/* Maple Timer channels:
- * Timer Maple Pin STM32 Pin Type
- * TIM1_CH1 D6 PA8 Advanced
- * TIM1_CH2 D7 PA9 Advanced
- * TIM1_CH3 D8 PA10 Advanced
- *
- * TIM2_CH1 D2 PA0
- * TIM2_CH2 D3 PA1
- * TIM2_CH3 D1 PA2
- * TIM2_CH4 D0 PA3
- *
- * TIM3_CH1 D12 PA6
- * TIM3_CH2 D11 PA7
- * TIM3_CH3 EXT7 PB0
- * TIM3_CH4 EXT8 PB1
- *
- * TIM4_CH1 EXT5 PB6
- * TIM4_CH1 EXT9 PB7
- * TIM4_CH1 EXT15 PB8
- * TIM4_CH1 EXT4 PB9
- *
- * Not supported:
- * TIM1_CH4 USBDM, not available PA11 Advanced
- * TIM1_CH1_N EXT12 PB13
- * TIM1_CH2_N EXT13 PB14
- * TIM1_CH3_N EXT14 PB15
- * */
-
-/* I don't like the Arduino API for dealing with pin modes.
- * How about...
- *
- * pinMode(digitalPin, PWM);
- * pwmWrite(digitalPin) */
-
-
-#ifndef _TIMERS_H_
-#define _TIMERS_H_
-#include <inttypes.h>
-
-#ifdef __cplusplus
-extern "C"{
-#endif
-
-typedef volatile uint32_t* TimerCCR;
-
-#define TIMER1_BASE 0x40012C00
-#define TIMER2_BASE 0x40000000
-#define TIMER3_BASE 0x40000400
-#define TIMER4_BASE 0x40000800
-
-#define ARPE BIT(7) // Auto-reload preload enable
-#define NOT_A_TIMER 0
-
-#define TIMER1_CH1_CCR (TimerCCR)(TIMER1_BASE + 0x34)
-#define TIMER1_CH2_CCR (TimerCCR)(TIMER1_BASE + 0x38)
-#define TIMER1_CH3_CCR (TimerCCR)(TIMER1_BASE + 0x3C)
-#define TIMER1_CH4_CCR (TimerCCR)(TIMER1_BASE + 0x40)
-
-#define TIMER2_CH1_CCR (TimerCCR)(TIMER2_BASE + 0x34)
-#define TIMER2_CH2_CCR (TimerCCR)(TIMER2_BASE + 0x38)
-#define TIMER2_CH3_CCR (TimerCCR)(TIMER2_BASE + 0x3C)
-#define TIMER2_CH4_CCR (TimerCCR)(TIMER2_BASE + 0x40)
-
-#define TIMER3_CH1_CCR (TimerCCR)(TIMER3_BASE + 0x34)
-#define TIMER3_CH2_CCR (TimerCCR)(TIMER3_BASE + 0x38)
-#define TIMER3_CH3_CCR (TimerCCR)(TIMER3_BASE + 0x3C)
-#define TIMER3_CH4_CCR (TimerCCR)(TIMER3_BASE + 0x40)
-
-#define TIMER4_CH1_CCR (TimerCCR)(TIMER4_BASE + 0x34)
-#define TIMER4_CH2_CCR (TimerCCR)(TIMER4_BASE + 0x38)
-#define TIMER4_CH3_CCR (TimerCCR)(TIMER4_BASE + 0x3C)
-#define TIMER4_CH4_CCR (TimerCCR)(TIMER4_BASE + 0x40)
-
-
-/* Turn on timer with prescale as the divisor
- * void timer_init(uint32_t timer, uint16_t prescale)
- * timer -> {1-4}
- * prescale -> {1-65535}
- * */
-void timer_init(uint8_t, uint16_t);
-void timers_disable(void);
-void timers_disable_channel(uint8, uint8);
-
-/* Turn on PWM with duty_cycle on the specified channel in timer.
- * This function takes in a pointer to the corresponding CCR
- * register for the pin cause it saves pwmWrite() a couple of
- * cycles.
- *
- * void timer_pwm(uint8_t channel, uint8_t duty_cycle);
- * channel -> {TIMERx_CHn_CCR}
- * duty_cycle -> {0-65535}
- *
- * PRECONDITIONS:
- * pin has been set to alternate function output
- * timer has been initialized
- */
-static inline void timer_pwm_write_ccr(TimerCCR CCR, uint16_t duty_cycle) {
- *CCR = duty_cycle;
-}
-
-#ifdef __cplusplus
-} // extern "C"
-#endif
-
-
-#endif
-