mirror of
https://gitee.com/anod/open_agb_firm.git
synced 2025-05-08 23:04:13 +08:00
99 lines
2.8 KiB
C
99 lines
2.8 KiB
C
#pragma once
|
|
|
|
/*
|
|
* This file is part of open_agb_firm
|
|
* Copyright (C) 2021 derrek, profi200
|
|
*
|
|
* 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/>.
|
|
*/
|
|
|
|
#include <assert.h>
|
|
#include "types.h"
|
|
#include "mem_map.h"
|
|
|
|
|
|
#define TIMER_REGS_BASE (IO_MEM_ARM9_ONLY + 0x3000)
|
|
|
|
typedef struct
|
|
{
|
|
vu16 val; // 0x0
|
|
vu16 cnt; // 0x2
|
|
} Timer;
|
|
static_assert(offsetof(Timer, cnt) == 2, "Error: Member cnt of Timer is not at offset 2!");
|
|
|
|
ALWAYS_INLINE Timer* getTimerRegs(u8 timer)
|
|
{
|
|
return &((Timer*)TIMER_REGS_BASE)[timer];
|
|
}
|
|
|
|
|
|
#define TIMER_BASE_FREQ (67027964)
|
|
|
|
// REG_TIMER_CNT
|
|
#define TIMER_PRESC_1 (0u)
|
|
#define TIMER_PRESC_64 (1u)
|
|
#define TIMER_PRESC_256 (2u)
|
|
#define TIMER_PRESC_1024 (3u)
|
|
#define TIMER_COUNT_UP (1u<<2) // For cascading at least 2 timers.
|
|
#define TIMER_IRQ_EN (1u<<6)
|
|
#define TIMER_EN (1u<<7)
|
|
|
|
// Convenience macros for calculating the ticks. Based on libnds.
|
|
#define TIMER_FREQ(n) (-TIMER_BASE_FREQ / (n))
|
|
#define TIMER_FREQ_64(n) (-(TIMER_BASE_FREQ / 64) / (n))
|
|
#define TIMER_FREQ_256(n) (-(TIMER_BASE_FREQ / 256) / (n))
|
|
#define TIMER_FREQ_1024(n) (-(TIMER_BASE_FREQ / 1024) / (n))
|
|
|
|
|
|
|
|
/**
|
|
* @brief Resets/initializes the timer hardware. Should not be called manually.
|
|
*/
|
|
void TIMER_init(void);
|
|
|
|
/**
|
|
* @brief Starts a timer.
|
|
*
|
|
* @param[in] tmr The timer to start (0-3). Timer 3 is reserved.
|
|
* @param[in] ticks The initial number of ticks. This is also the reload
|
|
* value on overflow.
|
|
* @param[in] params The parameters. See REG_TIMER_CNT defines above.
|
|
*/
|
|
void TIMER_start(u8 tmr, u16 ticks, u8 params);
|
|
|
|
/**
|
|
* @brief Returns the current number of ticks of the timer.
|
|
*
|
|
* @param[in] tmr The timer get the ticks from (0-3). Timer 3 is reserved.
|
|
*
|
|
* @return The number of ticks.
|
|
*/
|
|
u16 TIMER_getTicks(u8 tmr);
|
|
|
|
/**
|
|
* @brief Stops a timer and returns the current number of ticks.
|
|
*
|
|
* @param[in] tmr The timer to stop (0-3). Timer 3 is reserved.
|
|
*
|
|
* @return The number of ticks.
|
|
*/
|
|
u16 TIMER_stop(u8 tmr);
|
|
|
|
/**
|
|
* @brief Halts the CPU for the given number of milliseconds.
|
|
*
|
|
* @param[in] ms The number of milliseconds to sleep.
|
|
*/
|
|
void TIMER_sleepMs(u32 ms);
|