From 9f35b7a8ef84d7c96ce444e0081d9644f8da6c9a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?King=20K=C3=A9vin?= <kingkevin@cuvoodoo.info>
Date: Sat, 2 Aug 2014 16:10:04 -0700
Subject: [PATCH] dump codes when booting

---
 pic/MDR/MDR.c | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)

diff --git a/pic/MDR/MDR.c b/pic/MDR/MDR.c
index dbbc75e..74c9b81 100644
--- a/pic/MDR/MDR.c
+++ b/pic/MDR/MDR.c
@@ -266,6 +266,45 @@ void clear_memory(void)
 	}
 }
 
+/* read all codes from memory */
+void dump_codes(void)
+{
+	uint16_t address;
+	uint8_t stored[3];
+	/* start at begining of the memory */
+	send_start();
+	if (send_byte(0xa0)) { /* write address to eeprom at 0xA0/0x50 */
+		send_stop();
+		return;
+	}
+	if (send_byte(0x00)) { /* go to address 0x0000 */
+		send_stop();
+		return;
+	}
+	if (send_byte(0x00)) { /* go to address 0x0000 */
+		send_stop();
+		return;
+	}
+	/* start reading */
+	send_start();
+	if (send_byte(0xa1)) { /* read eeprom at 0xA0/0x50 */
+		send_stop();
+		return;
+	}
+	/* go through memory */
+	for (address=0; address<0x7FFF-2; address+=3) {
+		/* read stored code */
+		stored[0] = read_byte(1);
+		stored[1] = read_byte(1);
+		stored[2] = read_byte(1);
+		if ((stored[0]&0x80)==0) { /* code always have the MSb to 1 */
+			read_byte(0); /* send nack */
+			send_stop(); /* end transaction */
+			return; /* all codes have been read */
+		}
+	}
+}
+
 /* funcion called on interrupts */
 /* interrupt 0 is only one on PIC16 */
 static void interrupt(void) __interrupt 0
@@ -308,6 +347,7 @@ void main (void)
 	uint16_t new = 0; /* is the code new */
 
 	init(); /* configure micro-controller */
+	dump_codes(); /* dump codes when powering up so a logic analyzer can get them */
 
 	while (1) { /* a microcontroller runs forever */
 		/* I can't go to sleep to safe power