89 lines
2.9 KiB
C
89 lines
2.9 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 2019 Sony Semiconductor Solutions Corporation
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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 <stdbool.h>
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#include <sys/time.h>
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#include <cxd56_clock.h>
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#include <sys/boardctl.h>
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#include "py/mpstate.h"
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#include "supervisor/shared/tick.h"
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#define DELAY_CORRECTION (700)
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#define DELAY_INTERVAL (50)
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void mp_hal_init(void) {
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boardctl(BOARDIOC_INIT, 0);
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}
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mp_uint_t mp_hal_ticks_ms(void) {
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struct timeval tv;
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gettimeofday(&tv, NULL);
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return tv.tv_sec * 1000 + tv.tv_usec / 1000;
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}
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mp_uint_t mp_hal_ticks_us(void) {
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struct timeval tv;
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gettimeofday(&tv, NULL);
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return tv.tv_sec * 1000000 + tv.tv_usec;
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}
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mp_uint_t mp_hal_ticks_cpu(void) {
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return cxd56_get_cpu_baseclk();
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}
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void mp_hal_delay_ms(mp_uint_t delay) {
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uint64_t start_tick = supervisor_ticks_ms64();
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uint64_t duration = 0;
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while (duration < delay) {
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#ifdef MICROPY_VM_HOOK_LOOP
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MICROPY_VM_HOOK_LOOP
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#endif
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// Check to see if we've been CTRL-Ced by autoreload or the user.
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if(MP_STATE_VM(mp_pending_exception) == MP_OBJ_FROM_PTR(&MP_STATE_VM(mp_kbd_exception)) ||
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MP_STATE_VM(mp_pending_exception) == MP_OBJ_FROM_PTR(&MP_STATE_VM(mp_reload_exception))) {
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break;
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}
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duration = (supervisor_ticks_ms64() - start_tick);
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// TODO(tannewt): Go to sleep for a little while while we wait.
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}
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}
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void mp_hal_delay_us(uint32_t us) {
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if (us) {
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unsigned long long ticks = mp_hal_ticks_cpu() / 1000000L * us;
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if (ticks < DELAY_CORRECTION) return; // delay time already used in calculation
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ticks -= DELAY_CORRECTION;
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ticks /= 6;
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// following loop takes 6 cycles
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do {
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__asm__ __volatile__("nop");
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} while(--ticks);
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}
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}
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