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107 lines
2.9 KiB
C
107 lines
2.9 KiB
C
#pragma once
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/*
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* This file is part of libn3ds
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* Copyright (C) 2024 derrek, profi200
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "types.h"
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#include "mem_map.h"
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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#define TIMER_REGS_BASE (IO_AHB_BASE + 0x3000)
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typedef struct
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{
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vu16 val; // 0x0
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vu16 cnt; // 0x2
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} Timer;
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static_assert(offsetof(Timer, cnt) == 2, "Error: Member cnt of Timer is not at offset 2!");
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ALWAYS_INLINE Timer* getTimerRegs(u8 timer)
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{
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return &((Timer*)TIMER_REGS_BASE)[timer];
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}
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#define TIMER_BASE_FREQ (67027964)
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// REG_TIMER_CNT
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// Note: Prescalers are ignored in count-up mode.
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#define TIMER_PRESC_1 (0u)
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#define TIMER_PRESC_64 (1u)
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#define TIMER_PRESC_256 (2u)
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#define TIMER_PRESC_1024 (3u)
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#define TIMER_COUNT_UP BIT(2) // Increment on previous timer overflow.
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#define TIMER_IRQ_EN BIT(6)
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#define TIMER_EN BIT(7)
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// Convenience macros for calculating ticks from frequency. Based on libnds.
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#define TIMER_FREQ(f) (-TIMER_BASE_FREQ / (f))
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#define TIMER_FREQ_64(f) TIMER_FREQ((f)<<6)
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#define TIMER_FREQ_256(f) TIMER_FREQ((f)<<8)
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#define TIMER_FREQ_1024(f) TIMER_FREQ((f)<<10)
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/**
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* @brief Resets/initializes the timer hardware. For libn3ds internal usage only.
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*/
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void TIMER_init(void);
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/**
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* @brief Starts a timer.
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*
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* @param[in] tmr The timer to start (0-3). Timer 3 is reserved.
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* @param[in] ticks The initial number of ticks. This is also the reload
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* value on overflow.
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* @param[in] params The parameters. See REG_TIMER_CNT defines above.
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*/
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void TIMER_start(const u8 tmr, const u16 ticks, const u8 params);
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/**
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* @brief Returns the current number of ticks of the timer.
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*
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* @param[in] tmr The timer get the ticks from (0-3). Timer 3 is reserved.
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*
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* @return The number of ticks.
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*/
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u16 TIMER_getTicks(const u8 tmr);
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/**
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* @brief Stops a timer and returns the current number of ticks.
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*
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* @param[in] tmr The timer to stop (0-3). Timer 3 is reserved.
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*
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* @return The number of ticks.
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*/
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u16 TIMER_stop(const u8 tmr);
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/**
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* @brief Halts the CPU for the given number of milliseconds.
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*
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* @param[in] ms The number of milliseconds to sleep.
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*/
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void TIMER_sleepMs(const u32 ms);
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#ifdef __cplusplus
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} // extern "C"
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#endif |