forked from Elron_dev/elbear_arduino_bsp
klassents
47c01383e6
- добавлена библиотека softwareSerial. Скорость работы до 57600 включительно и на отправку, и на прием. - в bootloader добавлена проверка контрольной суммы - добавлен файл wiringLL.h, в котором собраны некоторые макросы. Этими макросами заменены функции в местах, чувствительных к длительности выполнения кода. - общие функции обработки прерываний перенесены в ram память для увеличения скорости выполнения. Так же в память ram перенесены функции обработки прерываний модулей WInterrupt (прерывания от gpio), модуля tone, модуля softwareSerial - добавлен файл-заглушка util/delay.h, необходимый для некоторых библиотек
99 lines
2.7 KiB
C
99 lines
2.7 KiB
C
/*
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Copyright (c) 2011 Arduino. All right reserved.
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library 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.
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See the GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "Arduino.h"
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#ifdef __cplusplus
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extern "C" {
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#endif
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#include "mik32_hal_scr1_timer.h"
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uint32_t start_del, current_del;
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// system timer initialization
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SCR1_TIMER_HandleTypeDef hscr1_timer;
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#define TICKS_IN_SYSTIMER ((uint64_t)(hscr1_timer.Instance->MTIMEH)<<32 | hscr1_timer.Instance->MTIME)
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void SysTick_Init(void)
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{
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hscr1_timer.Instance = SCR1_TIMER;
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hscr1_timer.ClockSource = SCR1_TIMER_CLKSRC_INTERNAL;
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hscr1_timer.Divider = 0;
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HAL_SCR1_Timer_Init(&hscr1_timer); // Ticks are 32 MHz
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}
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uint64_t SysTick_GetTicks(void)
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{
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return TICKS_IN_SYSTIMER;
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}
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// number of microseconds since start of the program
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uint32_t micros(void)
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{
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// cast to uint32_t and assume that when HAL_SCR1_Timer_Get_Ticks() returns a number
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// greater than 2^32/32, the variable will overflow itself
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return (uint32_t)(TICKS_IN_SYSTIMER >> 5);
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}
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// there may be a problem with the timer counter overflow, because by the time it
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// overflows the number of milliseconds will not have time to reach the maximum,
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// and when it overflows it will be reseted to 0 ahead of time - the delay will be
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// incorrect. But 64 bits will take a very long time to fill, so we'll leave it like that
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volatile uint32_t millis(void)
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{
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return (uint32_t) (TICKS_IN_SYSTIMER / (uint64_t)(32000));
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}
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void delay(uint32_t ms)
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{
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if (ms > 0)
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{
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start_del = millis();
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while (1)
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{
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current_del = millis();
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// Let's check if there was an overflow.
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if (((current_del > start_del) ? (current_del - start_del) : (current_del + ~start_del + 1)) >= ms)
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// exit if we got the required amount
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break;
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}
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}
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}
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void delayMicroseconds(uint16_t us)
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{
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if (us > 0)
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{
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start_del = micros();
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while (1)
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{
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current_del = micros();
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// Let's check if there was an overflow.
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if (((current_del > start_del) ? (current_del - start_del) : (current_del + ~start_del + 1)) >= us)
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// exit if we got the required amount
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break;
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}
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}
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}
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#ifdef __cplusplus
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}
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#endif
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