firmware/clock.h

   1 /*
   2  * clock.h - part of USBasp
   3  *
   4  * Autor..........: Thomas Fischl <tfischl@gmx.de>
   5  * Description....: Provides functions for timing/waiting
   6  * Licence........: GNU GPL v2 (see Readme.txt)
   7  * Creation Date..: 2005-02-23
   8  * Last change....: 2006-11-16
   9  */
  10
  11 #ifndef __clock_h_included__
  12 #define __clock_h_included__
  13
  14 #ifndef F_CPU
  15 #define F_CPU           12000000L   /* 12MHz */
  16 #endif
  17 #define TIMERVALUE      TCNT0
  18 #define CLOCK_T_320us   (320 * (F_CPU/1000000L) / 64)
  19
  20 #ifdef __AVR_ATmega8__
  21 #define TCCR0B  TCCR0
  22 #endif
  23
  24 /* set prescaler to 64 */
  25 #define clockInit()  TCCR0B = (1 << CS01) | (1 << CS00);
  26
  27 /* wait time * 320 us */
  28 void clockWait(uint8_t time);
  29
  30 #endif /* __clock_h_included__ */