83 lines
2.8 KiB
C
83 lines
2.8 KiB
C
/*
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* This file is part of the MicroPython project, http://micropython.org/
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*
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* The MIT License (MIT)
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*
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* Copyright (c) 2017 Scott Shawcroft for Adafruit Industries
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "csr.h"
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#include "tick.h"
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#include "irq.h"
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#include "supervisor/shared/autoreload.h"
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#include "supervisor/filesystem.h"
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#include "supervisor/shared/tick.h"
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#include "shared-module/gamepad/__init__.h"
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#include "shared-bindings/microcontroller/Processor.h"
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// Global millisecond tick count
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// volatile uint64_t ticks_ms = 0;
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__attribute__((section(".ramtext")))
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void SysTick_Handler(void) {
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timer0_ev_pending_write(1);
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supervisor_tick();
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}
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void tick_init() {
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int t;
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timer0_en_write(0);
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t = CONFIG_CLOCK_FREQUENCY / 1000; // 1000 kHz tick
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timer0_reload_write(t);
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timer0_load_write(t);
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timer0_en_write(1);
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timer0_ev_enable_write(1);
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timer0_ev_pending_write(1);
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irq_setmask(irq_getmask() | (1 << TIMER0_INTERRUPT));
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}
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void tick_delay(uint32_t us) {
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// uint32_t ticks_per_us = SystemCoreClock / 1000 / 1000;
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// uint32_t us_between_ticks = SysTick->VAL / ticks_per_us;
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// uint64_t start_ms = ticks_ms;
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// while (us > 1000) {
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// while (ticks_ms == start_ms) {}
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// us -= us_between_ticks;
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// start_ms = ticks_ms;
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// us_between_ticks = 1000;
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// }
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// while (SysTick->VAL > ((us_between_ticks - us) * ticks_per_us)) {}
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}
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// us counts down!
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void current_tick(uint64_t* ms, uint32_t* us_until_ms) {
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// uint32_t ticks_per_us = SystemCoreClock / 1000 / 1000;
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// *ms = ticks_ms;
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// *us_until_ms = SysTick->VAL / ticks_per_us;
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}
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void wait_until(uint64_t ms, uint32_t us_until_ms) {
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// uint32_t ticks_per_us = SystemCoreClock / 1000 / 1000;
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// while(ticks_ms <= ms && SysTick->VAL / ticks_per_us >= us_until_ms) {}
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}
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