From 77ad1a84f7fa19a455a228d7b9679291e94550ea Mon Sep 17 00:00:00 2001
From: Michael Gernoth <michael@gernoth.net>
Date: Sun, 22 Aug 2010 20:19:29 +0200
Subject: [PATCH 1/1] ipmb messages from RSBS2 card

---
 bmc/bmc.c             | 14 ++++++++++++--
 bmc/i2c.c             | 42 +++++++++++++++++++++++++++++++++++++++---
 bmc/ipmb-messages.txt | 16 ++++++++++++++++
 3 files changed, 67 insertions(+), 5 deletions(-)
 create mode 100644 bmc/ipmb-messages.txt

diff --git a/bmc/bmc.c b/bmc/bmc.c
index d7c5cdc..4a7f02f 100644
--- a/bmc/bmc.c
+++ b/bmc/bmc.c
@@ -4,6 +4,18 @@
 #include <stdio.h>
 #include "usart.h"
 #include "i2c.h"
+#include "bmc.h"
+
+void decode_bmc_cmd(unsigned char *buf, int len)
+{
+	int i;
+
+	for(i = 0; i < len; i++) {
+		printf("0x%02x ", buf[i]);
+	}
+
+	printf("\n");
+}
 
 int main(void)
 {
@@ -19,8 +31,6 @@ int main(void)
 
 	sei();
 
-	PORTB = 0xff;
-
 	while(1) {
 #if 1
 		sleep_mode();
diff --git a/bmc/i2c.c b/bmc/i2c.c
index 214d410..7104758 100644
--- a/bmc/i2c.c
+++ b/bmc/i2c.c
@@ -2,11 +2,15 @@
 #include <avr/interrupt.h>
 #include <stdio.h>
 #include "i2c.h"
+#include "bmc.h"
 
 #define TWCR_ACK TWCR = (1<<TWEN)|(1<<TWIE)|(1<<TWINT)|(1<<TWEA)|(0<<TWSTA)|(0<<TWSTO)|(0<<TWWC);  
 #define TWCR_NACK TWCR = (1<<TWEN)|(1<<TWIE)|(1<<TWINT)|(0<<TWEA)|(0<<TWSTA)|(0<<TWSTO)|(0<<TWWC);
 #define TWCR_RESET TWCR = (1<<TWEN)|(1<<TWIE)|(1<<TWINT)|(1<<TWEA)|(0<<TWSTA)|(1<<TWSTO)|(0<<TWWC);  
 
+static volatile unsigned char databuf[12];
+static volatile uint8_t pos = 0x00;
+
 void i2c_init()
 {
 	TWAR = BMC_ADDR & 0xfe;
@@ -19,11 +23,43 @@ void i2c_init()
 
 ISR (TWI_vect, ISR_BLOCK)
 {
-	printf("Interrupt, Status: 0x%02x, Data: 0x%02x!\n", TW_STATUS, TWDR);
-
 	switch (TW_STATUS) {
-		default:
+		case TW_SR_SLA_ACK:
+#ifdef DEBUG
+			printf("I2C: Slave 0x%02x adressed\n", TWDR);
+#endif
+			pos = 0x00;
+			TWCR_ACK;
+			break;
+
+		case TW_SR_DATA_ACK:
+#ifdef DEBUG
+			printf("I2C: Data received: 0x%02x\n", TWDR);
+#endif
+			databuf[pos] = TWDR;
+			pos++;
+			TWCR_ACK;
+			break;
+
+		case TW_SR_STOP:
+#ifdef DEBUG
+			printf("I2C: STOP received\n");
+#endif
+			decode_bmc_cmd((unsigned char*)databuf, pos);
+			pos = 0x00;
+			TWCR_RESET;
+			break;
+
+		case TW_ST_SLA_ACK:
+		case TW_ST_DATA_ACK:
+			printf("I2C: Data requested\n");
+			TWDR = 0x00;
 			TWCR_ACK;
 			break;
+
+		default:
+			printf("I2C: Unimplemented status 0x%02x\n", TW_STATUS);
+			TWCR_RESET;
+			break;
 	}
 }
diff --git a/bmc/ipmb-messages.txt b/bmc/ipmb-messages.txt
new file mode 100644
index 0000000..2f948f8
--- /dev/null
+++ b/bmc/ipmb-messages.txt
@@ -0,0 +1,16 @@
+Power OFF:
+	0x00 0xdc 0x28 0x04 0x02 0x00 0xd2 
+	0x00 0xdc 0x28 0x08 0x02 0x00 0xce 
+
+Hard Reset:
+	0x00 0xdc 0x28 0x04 0x02 0x03 0xcf 
+
+Power ON:
+	0x00 0xdc 0x28 0x04 0x02 0x01 0xd1 
+	0x00 0xdc 0x28 0x08 0x02 0x01 0xcd 
+
+Unknown (periodic messages):
+	0x18 0xc4 0x28 0x04 0x25 0xaf 
+	0x18 0xc4 0x28 0x04 0x01 0xd3 
+	0x18 0xc4 0x28 0x08 0x25 0xab 
+	0x18 0xc4 0x28 0x08 0x01 0xcf 
-- 
2.39.5