/* Copyright (C) 2006 Marcin Slonicki . This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. ----------------------------------------------------------------------- this file is a part of the TOYOTA Corolla MP3 Player Project ----------------------------------------------------------------------- http://www.softservice.com.pl/corolla/avc May 28 / 2009 - version 2 */ #ifndef _delay_h_ #define _delay_h_ #include #include #include "const.h" /* delay function for microsec 4 cpu cycles per loop + 1 cycles(?) overhead when a constant is passed. */ static inline void delayloop16(uint16_t count) { asm volatile ( "cp %A0,__zero_reg__ \n\t" \ "cpc %B0,__zero_reg__ \n\t" \ "breq L_Exit_%= \n\t" \ "L_LOOP_%=: \n\t" \ "sbiw %0,1 \n\t" \ "brne L_LOOP_%= \n\t" \ "L_Exit_%=: \n\t" \ : "=w" (count) : "0" (count) ); } // delayloop16(x) eats 4 cycles per x #define DELAY_US_CONV(us) ((uint16_t)(((((us)*1000L)/(1000000000/F_CPU))-1)/4)) #define delay_us(us) delayloop16(DELAY_US_CONV(us)) /* delay function for millisec (6 cycles per x + 20(?) overhead) */ void delayloop32( uint32_t l); // not inline #define DELAY_MS_CONV(ms) ( (uint32_t) (ms*(F_CPU/6000L)) ) #define delay_ms(ms) delayloop32(DELAY_MS_CONV(ms)) void delay1us(volatile u08 delay, u08 count); void delay1(u16 count); #endif