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xtirq.h
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xtirq.h
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/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2016 Damien P. George
*
* 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.
*/
#ifndef MICROPY_INCLUDED_ESP8266_XTIRQ_H
#define MICROPY_INCLUDED_ESP8266_XTIRQ_H
#include <stdint.h>
// returns the value of "intlevel" from the PS register
static inline uint32_t query_irq(void) {
uint32_t ps;
__asm__ volatile ("rsr %0, ps" : "=a" (ps));
return ps & 0xf;
}
// irqs with a priority value lower or equal to "intlevel" will be disabled
// "intlevel" should be between 0 and 15 inclusive, and should be an integer
static inline uint32_t raise_irq_pri(uint32_t intlevel) {
uint32_t old_ps;
__asm__ volatile ("rsil %0, %1" : "=a" (old_ps) : "I" (intlevel));
return old_ps;
}
// "ps" should be the value returned from raise_irq_pri
static inline void restore_irq_pri(uint32_t ps) {
__asm__ volatile ("wsr %0, ps; rsync" : : "a" (ps));
}
static inline uint32_t disable_irq(void) {
return raise_irq_pri(15);
}
static inline void enable_irq(uint32_t irq_state) {
restore_irq_pri(irq_state);
}
#endif // MICROPY_INCLUDED_ESP8266_XTIRQ_H