First commit

1 files changed, 100 insertions, 0 deletions

diff --git a/cyfral.c b/cyfral.c
new file mode 100644
index 0000000..9faec5d
--- /dev/null
+++ b/cyfral.c
@@ -0,0 +1,100 @@
+#include <avr/io.h>
+#include "defines.h"
+#include "ibutton.h"
+#include "bits.h"
+#include "cyfral.h"
+#include "onewire.h"
+
+inline void cyfral_send_nibble(uint8_t data)
+{
+	uint8_t b;
+	for (b = 0; b < 4; b++)
+	{
+		if (data & (1UL<<b))
+		{
+			ONEWIRE_MASTER_TX(105);			
+			ONEWIRE_WAIT(36);
+		} else {
+			ONEWIRE_MASTER_TX(53);			
+			ONEWIRE_WAIT(80);
+		}
+	}
+}
+
+void cyfral_send(uint16_t key)
+{
+	cyfral_send_nibble(0b0111);
+	uint8_t b;
+	for (b = 0; b < 8; b++)
+	{
+		speedup_leds();
+		update_leds();
+		cyfral_send_nibble(1UL << ((key >> (b*2)) & 0b11));
+	}
+}
+
+long int read_cyfral()
+{
+	uint16_t buffer[100];
+	int pos = 0;
+	do 
+	{
+		TCNT1 = 0;
+		while (!CYFRAL_SIGNAL && TCNT1 < 0x400);
+		if (TCNT1 >= 0x400) return -1;
+		//buffer[pos++] = TCNT1;
+		TCNT1 = 0;
+		while (CYFRAL_SIGNAL && TCNT1 < 0x400);
+		if (TCNT1 >= 0x400) return -1;
+		buffer[pos++] = TCNT1;
+		
+	} while (pos < sizeof(buffer)/2);
+	int i, j;
+	int startpos = -1;
+	for (i = 0; i < pos-9*4; i++)
+	{
+		if ((buffer[i] > 70) && (buffer[i+1] > 70)  && (buffer[i+2] > 70) && (buffer[i+3] < 70))
+		{
+			startpos = i;
+			break;
+		}
+	}
+	uint16_t code = 0;
+	int b = 0;
+	if (startpos >= 0)
+	{
+		for (i = startpos+4; i < startpos+9*4; i+=4)
+		{
+			for (j = 0; j < 4; j++)
+			{
+				//send_num(buffer[i+j]);
+				if (buffer[i+j] > 70)
+					code |= j << (b*2);
+			}
+			b++;
+		}
+	} else return -1;
+	return code;	
+}
+
+long int read_cyfral_with_check()	
+{
+	long int code = 0, tries = 0, i;
+	for (i = 0; i < 10; i++)
+	{
+		long int code2 = read_cyfral();
+		if ((code2 >= 0) && (code == code2))
+		{
+			tries++;
+		} else {
+			tries = 0;
+			code = code2;
+		}
+		if (tries >= 3) 
+		{
+			return code2;
+		}
+	}	
+	return -1;
+}
+