move READ ROM code to separate directory

1 files changed, 0 insertions, 166 deletions

diff --git a/main.c b/main.c
deleted file mode 100644
index e20b45f..0000000
--- a/main.c
+++ /dev/null
@@ -1,166 +0,0 @@
-#include <avr/io.h>
-#include <avr/interrupt.h>
-#include <stdlib.h>
-
-/*
- * Onewire iButton / SmartButton slave.
- * Has the 64bit ID set below
- * (corresponds to <https://wiki.chaosdorf.de/images/f/fc/Smartbutton.jpg>).
- *
- * Only supports non-overdrive READ ROM. Does not hold any data.
- *
- * Tested and working with a DS2482. Should mostly adhere to the standard,
- * but nothing is guaranteed.
- *
- * Any unexpected input (SKIP ROM, overdriv, ...) may cause a hangup requiring
- * an AVR reset.
- */
-
-#define ADDR1 0xC4
-#define ADDR2 0x00
-#define ADDR3 0x00
-#define ADDR4 0x09
-#define ADDR5 0x7d
-#define ADDR6 0x79
-#define ADDR7 0x04
-#define ADDR8 0x01
-
-// HCNT: r30 (ZL), r31 (ZH)
-// LCNT: r28 (YL), r29 (YH)
-
-#define LCNTH GPIOR2
-#define LCNTL GPIOR1
-#define HCNTL GPIOR0
-
-#define CNT USIDR
-#define LASTCMD OCR0B
-#define BUF OCR0A
-#define POS OCR1A
-#define APOS OCR1B
-#define BYTE EEDR
-
-int main (void)
-{
-	/* watchdog reset after ~4 seconds */
-	MCUSR &= ~_BV(WDRF);
-	WDTCSR = _BV(WDCE) | _BV(WDE);
-	WDTCSR = _BV(WDE) | _BV(WDP3);
-
-	MCUCR = _BV(ISC10);
-	GIMSK = _BV(INT1);
-
-	ACSR |= _BV(ACD);
-
-	POS = 0;
-	APOS = 0;
-	DDRD = 0;
-	PORTD = 0;
-
-	sei();
-
-	asm volatile ("ldi r28, 0");
-	asm volatile ("ldi r29, 0");
-	asm volatile ("ldi r30, 0");
-	asm volatile ("ldi r31, 0");
-
-	// 1us
-	while (1) { // 1c
-		asm volatile ("inc r30"); // 1c
-		asm volatile ("adiw r28, 1"); // 2c
-		asm volatile ("wdr"); // 1c
-	}
-
-	return 0;
-}
-
-ISR(INT1_vect)
-{
-	if (PIND & _BV(PD3)) {
-
-		asm("out 0x15, r29"); // LCNTH
-		asm("out 0x14, r28"); // LCNTL
-		asm("out 0x13, r30"); // HCNTL
-
-		// > 256us - reset
-		if (LCNTH > 0) {
-			DDRD = _BV(PD3);
-			// 120us
-			for (CNT = 0; CNT < 120; CNT++) {
-				asm volatile ("wdr");
-			}
-			DDRD = 0;
-			asm volatile ("wdr");
-			EIFR |= _BV(INTF1);
-		}
-		// ~60us - write 0
-		else if (LCNTL > 6) {
-			if (!LASTCMD)
-				POS++;
-		}
-		// < ~15us - write 1 OR read
-		else {
-			if (!LASTCMD) {
-				BUF |= _BV(POS);
-				POS++;
-			}
-		}
-		if (!LASTCMD && (POS == 7)) {
-			LASTCMD = BUF;
-			POS = 1;
-			APOS = 0;
-			BYTE = ~ADDR8;
-			MCUCR = _BV(ISC11);
-			EIFR |= _BV(INTF1);
-		}
-
-
-		asm volatile ("ldi r30, 1"); // HCNTL = 1
-	}
-	else {
-		if (LASTCMD == 0x33) {
-
-			if (BYTE & POS) {
-
-				DDRD = _BV(PD3);
-				// 15us
-				for (CNT = 0; CNT < 18; CNT++) {
-					asm volatile ("wdr");
-				}
-				DDRD = 0;
-				asm volatile ("wdr");
-				EIFR |= _BV(INTF1);
-			}
-			if (POS != 0x80) {
-				POS <<= 1;
-			}
-			else {
-				APOS++;
-				POS = 1;
-				if (APOS == 1)
-					BYTE = ~ADDR7;
-				else if (APOS == 2)
-					BYTE = ~ADDR6;
-				else if (APOS == 3)
-					BYTE = ~ADDR5;
-				else if (APOS == 4)
-					BYTE = ~ADDR4;
-				else if (APOS == 5)
-					BYTE = ~ADDR3;
-				else if (APOS == 6)
-					BYTE = ~ADDR2;
-				else if (APOS == 7)
-					BYTE = ~ADDR1;
-
-				else if (APOS == 8) {
-					LASTCMD = 0;
-					MCUCR = _BV(ISC10);
-					POS = 0;
-				}
-			}
-		}
-		asm volatile ("ldi r29, 0"); // LCNTH = 0
-		asm volatile ("ldi r28, 1"); // LCNTL = 1
-
-	}
-
-}