circuitpython/ports/litex/mphalport.c

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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2015 Glenn Ruben Bakke
* Copyright (c) 2018 Artur Pacholec
*
* 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 <string.h>
#include "py/mphal.h"
#include "py/mpstate.h"
#include "py/gc.h"
#include "csr.h"
#include "generated/soc.h"
#include "irq.h"
/*------------------------------------------------------------------*/
/* delay
*------------------------------------------------------------------*/
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(mp_uint_t delay) {
mp_hal_delay_ms(delay / 1000);
}
extern void SysTick_Handler(void);
__attribute__((section(".ramtext")))
void isr(void) {
uint8_t irqs = irq_pending() & irq_getmask();
#ifdef CFG_TUSB_MCU
if (irqs & (1 << USB_INTERRUPT))
tud_int_handler(0);
#endif
if (irqs & (1 << TIMER0_INTERRUPT))
SysTick_Handler();
}
mp_uint_t cpu_get_regs_and_sp(mp_uint_t *regs) {
unsigned long __tmp;
asm volatile ("mv %0, x2" :"=r"(__tmp));
return __tmp;
}