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circuitpython/ports/cxd56/mphalport.c

88 lines
2.9 KiB

/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright 2019 Sony Semiconductor Solutions Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdbool.h>
#include <sys/time.h>
#include <cxd56_clock.h>
#include <sys/boardctl.h>
#include "py/mpstate.h"
#include "supervisor/shared/tick.h"
#define DELAY_CORRECTION (700)
#define DELAY_INTERVAL (50)
void mp_hal_init(void) {
boardctl(BOARDIOC_INIT, 0);
}
mp_uint_t mp_hal_ticks_ms(void) {
struct timeval tv;
gettimeofday(&tv, NULL);
return tv.tv_sec * 1000 + tv.tv_usec / 1000;
}
mp_uint_t mp_hal_ticks_us(void) {
struct timeval tv;
gettimeofday(&tv, NULL);
return tv.tv_sec * 1000000 + tv.tv_usec;
}
mp_uint_t mp_hal_ticks_cpu(void) {
return cxd56_get_cpu_baseclk();
}
void mp_hal_delay_ms(mp_uint_t delay) {
uint64_t start_tick = supervisor_ticks_ms64();
uint64_t duration = 0;
while (duration < delay) {
#ifdef MICROPY_VM_HOOK_LOOP
MICROPY_VM_HOOK_LOOP
#endif
// Check to see if we've been CTRL-Ced by autoreload or the user.
if(MP_STATE_VM(mp_pending_exception) == MP_OBJ_FROM_PTR(&MP_STATE_VM(mp_kbd_exception)) ||
MP_STATE_VM(mp_pending_exception) == MP_OBJ_FROM_PTR(&MP_STATE_VM(mp_reload_exception))) {
break;
}
duration = (supervisor_ticks_ms64() - start_tick);
// TODO(tannewt): Go to sleep for a little while while we wait.
}
}
void mp_hal_delay_us(uint32_t us) {
if (us) {
unsigned long long ticks = mp_hal_ticks_cpu() / 1000000L * us;
if (ticks < DELAY_CORRECTION) return; // delay time already used in calculation
ticks -= DELAY_CORRECTION;
ticks /= 6;
// following loop takes 6 cycles
do {
__asm__ __volatile__("nop");
} while(--ticks);
}
}