216 lines
4.7 KiB
C
216 lines
4.7 KiB
C
/*
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u8g_delay.c
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Universal 8bit Graphics Library
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Copyright (c) 2011, olikraus@gmail.com
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All rights reserved.
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Redistribution and use in source and binary forms, with or without modification,
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are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice, this list
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of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice, this
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list of conditions and the following disclaimer in the documentation and/or other
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materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
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ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "u8g.h"
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/*==== Part 1: Derive suitable delay procedure ====*/
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#if defined(ARDUINO)
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# if defined(__AVR__)
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# define USE_AVR_DELAY
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# elif defined(__PIC32MX)
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# define USE_PIC32_DELAY
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# elif defined(__arm__) /* Arduino Due */
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# define USE_ARDUINO_DELAY
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# else
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# define USE_ARDUINO_DELAY
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# endif
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#elif defined(__AVR__)
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# define USE_AVR_DELAY
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#elif defined(__18CXX)
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# define USE_PIC18_DELAY
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#else
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# define USE_DUMMY_DELAY
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#endif
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/*==== Part 2: Definition of the delay procedures ====*/
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/*== AVR Delay ==*/
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#if defined(USE_AVR_DELAY)
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#include <avr/interrupt.h>
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#include <avr/io.h>
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#include <util/delay.h>
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/*
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Delay by the provided number of milliseconds.
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Thus, a 16 bit value will allow a delay of 0..65 seconds
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Makes use of the _delay_loop_2
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_delay_loop_2 will do a delay of n * 4 prozessor cycles.
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with f = F_CPU cycles per second,
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n = f / (1000 * 4 )
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with f = 16000000 the result is 4000
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with f = 1000000 the result is 250
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the millisec loop, gcc requires the following overhead:
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- movev 1
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- subwi 2x2
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- bne i 2
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==> 7 cycles
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==> must be devided by 4, rounded up 7/4 = 2
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*/
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void u8g_Delay(uint16_t val)
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{
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/* old version did a call to the arduino lib: delay(val); */
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while( val != 0 )
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{
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_delay_loop_2( (F_CPU / 4000 ) -2);
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val--;
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}
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}
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/* delay by one micro second */
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void u8g_MicroDelay(void)
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{
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#if (F_CPU / 4000000 ) > 0
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_delay_loop_2( (F_CPU / 4000000 ) );
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#endif
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}
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/* delay by 10 micro seconds */
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void u8g_10MicroDelay(void)
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{
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#if (F_CPU / 400000 ) > 0
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_delay_loop_2( (F_CPU / 400000 ) );
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#endif
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}
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#endif
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/*== Delay for PIC18 (not tested) ==*/
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#if defined(USE_PIC18_DELAY)
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#include <delays.h>
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#define GetSystemClock() (64000000ul) // Hz
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#define GetInstructionClock() (GetSystemClock()/4)
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void u8g_Delay(uint16_t val)
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{/*
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unsigned int _iTemp = (val);
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while(_iTemp--)
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Delay1KTCYx((GetInstructionClock()+999999)/1000000);
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*/
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}
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void u8g_MicroDelay(void)
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{
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/* not implemented */
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}
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void u8g_10MicroDelay(void)
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{
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/* not implemented */
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}
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#endif
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/*== Arduino Delay ==*/
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#if defined(USE_ARDUINO_DELAY)
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void u8g_Delay(uint16_t val)
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{
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delay(val);
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}
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void u8g_MicroDelay(void)
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{
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delayMicroseconds(1);
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}
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void u8g_10MicroDelay(void)
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{
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delayMicroseconds(10);
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}
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#endif
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#if defined(USE_PIC32_DELAY)
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/*
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Assume chipkit here with F_CPU correctly defined
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The problem was, that u8g_Delay() is called within the constructor.
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It seems that the chipkit is not fully setup at this time, so a
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call to delay() will not work. So here is my own implementation.
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*/
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#define CPU_COUNTS_PER_SECOND (F_CPU/2UL)
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#define TICKS_PER_MILLISECOND (CPU_COUNTS_PER_SECOND/1000UL)
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#include "plib.h"
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void u8g_Delay(uint16_t val)
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{
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uint32_t d;
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uint32_t s;
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d = val;
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d *= TICKS_PER_MILLISECOND;
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s = ReadCoreTimer();
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while ( (uint32_t)(ReadCoreTimer() - s) < d )
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;
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}
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void u8g_MicroDelay(void)
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{
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uint32_t d;
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uint32_t s;
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d = TICKS_PER_MILLISECOND/1000;
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s = ReadCoreTimer();
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while ( (uint32_t)(ReadCoreTimer() - s) < d )
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;
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}
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void u8g_10MicroDelay(void)
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{
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uint32_t d;
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uint32_t s;
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d = TICKS_PER_MILLISECOND/100;
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s = ReadCoreTimer();
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while ( (uint32_t)(ReadCoreTimer() - s) < d )
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;
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}
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#endif
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/*== Any other systems: Dummy Delay ==*/
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#if defined(USE_DUMMY_DELAY)
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void u8g_Delay(uint16_t val)
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{
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/* do not know how to delay... */
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}
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void u8g_MicroDelay(void)
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{
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}
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void u8g_10MicroDelay(void)
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{
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}
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#endif
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