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13 pfowler 1 
#include <avr/io.h>
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#include <avr/wdt.h>
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#include <avr/interrupt.h>
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#include <string.h>
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#include <util/delay.h>
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#include <stdlib.h>
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#include "avrutil.h"
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uint32_t millis(void) {
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	return systime;
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}
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inline uint8_t map_8(uint8_t x, uint8_t in_min, uint8_t in_max, uint8_t out_min, uint8_t out_max) {
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	return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
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}
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inline void delay_ms(uint16_t count) {
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  while(count--)
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    _delay_ms(1);
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}
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void pulsePin(uint8_t port, uint8_t pin, uint16_t count) {
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  sbi(port, pin);
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  delay_ms(count);
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  cbi(port, pin);
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}
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char* tick_addr;
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void sysclockInit(void) {
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#if defined (__AVR_ATtiny24__)
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	TIMSK0 = (1<<TOIE0);             // Eable timer overflow for Timer0
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#elif defined (__AVR_ATtiny4313__)
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	TIMSK = (1<<TOIE0);             // Eable timer overflow for Timer0
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#endif
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	TCCR0B = (1 << CS00) ;          // /1 prescaler
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	TCNT0 = 0x00;                   // Set Timer0 to 0
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}
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void swap_u8(uint8_t* a, uint8_t* b) {
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	uint8_t t = *b;
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	*b = *a;
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	*a = t;
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}
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void swap_u16(uint16_t* a, uint16_t* b) {
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	uint16_t t = *b;
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	*b = *a;
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	*a = t;
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}
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/*
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 * Convert from a uint32 to BCD
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 * Use like:
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 * 	uint8_t[10] values; itobcd(ui32num, values);
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 * 	values will be an array with BCD digits
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 * 	returned value will be how many digits used
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 */
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uint8_t itobcd(uint32_t val, uint8_t *result) {
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  char BCD_text[10]; // max 10 digits on uint32
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  uint8_t i = 0;
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  itoa(val, BCD_text, 10);
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  while(BCD_text[i]) {
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    result[i] = BCD_text[i]-'0';
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    i++;
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  }
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  return i;
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}
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