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121 lines
4.6 KiB
121 lines
4.6 KiB
// clang-format off
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/*
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* This file is part of the Trezor project, https://trezor.io/
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*
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* Copyright (c) SatoshiLabs
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/*
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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) 2013, 2014 Damien P. George
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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 "py/runtime.h"
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#include "py/mphal.h"
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#include "ports/stm32/irq.h"
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#include "ports/stm32/systick.h"
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#include "ports/stm32/pybthread.h"
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extern __IO uint32_t uwTick;
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// We provide our own version of HAL_Delay that calls __WFI while waiting,
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// and works when interrupts are disabled. This function is intended to be
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// used only by the ST HAL functions.
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void HAL_Delay(uint32_t Delay) {
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if (query_irq() == IRQ_STATE_ENABLED) {
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// IRQs enabled, so can use systick counter to do the delay
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uint32_t start = uwTick;
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// Wraparound of tick is taken care of by 2's complement arithmetic.
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while (uwTick - start < Delay) {
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// Enter sleep mode, waiting for (at least) the SysTick interrupt.
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__WFI();
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}
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} else {
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// IRQs disabled, use mp_hal_delay_ms routine.
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mp_hal_delay_ms(Delay);
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}
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}
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// Core delay function that does an efficient sleep and may switch thread context.
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// If IRQs are enabled then we must have the GIL.
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void mp_hal_delay_ms(mp_uint_t Delay) {
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if (query_irq() == IRQ_STATE_ENABLED) {
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// IRQs enabled, so can use systick counter to do the delay
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uint32_t start = uwTick;
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// Wraparound of tick is taken care of by 2's complement arithmetic.
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while (uwTick - start < Delay) {
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// This macro will execute the necessary idle behaviour. It may
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// raise an exception, switch threads or enter sleep mode (waiting for
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// (at least) the SysTick interrupt).
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MICROPY_EVENT_POLL_HOOK
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}
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} else {
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// IRQs disabled, so need to use a busy loop for the delay.
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// To prevent possible overflow of the counter we use a double loop.
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const uint32_t count_1ms = HAL_RCC_GetSysClockFreq() / 4000;
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for (int i = 0; i < Delay; i++) {
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for (uint32_t count = 0; ++count <= count_1ms;) {
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}
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}
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}
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}
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// delay for given number of microseconds
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void mp_hal_delay_us(mp_uint_t usec) {
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if (query_irq() == IRQ_STATE_ENABLED) {
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// IRQs enabled, so can use systick counter to do the delay
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uint32_t start = mp_hal_ticks_us();
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while (mp_hal_ticks_us() - start < usec) {
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}
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} else {
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// IRQs disabled, so need to use a busy loop for the delay
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// sys freq is always a multiple of 2MHz, so division here won't lose precision
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const uint32_t ucount = HAL_RCC_GetSysClockFreq() / 2000000 * usec / 2;
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for (uint32_t count = 0; ++count <= ucount;) {
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}
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}
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}
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mp_uint_t mp_hal_ticks_ms(void) {
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return uwTick;
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}
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mp_uint_t mp_hal_ticks_us(void) {
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return uwTick * 1000;
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}
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