X-Git-Url: https://git.zerfleddert.de/cgi-bin/gitweb.cgi/rsbs2/blobdiff_plain/77ad1a84f7fa19a455a228d7b9679291e94550ea..18037a5ad01238943aa7b82104787caaae838ea3:/bmc/i2c.c

diff --git a/bmc/i2c.c b/bmc/i2c.c
index 7104758..92c00cc 100644
--- a/bmc/i2c.c
+++ b/bmc/i2c.c
@@ -3,32 +3,87 @@
 #include <stdio.h>
 #include "i2c.h"
 #include "bmc.h"
+#include "ipmb.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;
+volatile unsigned char i2c_databuf[24];
+volatile uint8_t i2c_len = 0x00;
+static volatile uint8_t i2c_pos = 0x00;
+volatile uint8_t i2c_done = 0x00;
 
 void i2c_init()
 {
+	TWBR = 0xff;
 	TWAR = BMC_ADDR & 0xfe;
 	TWDR = 0x00;
 	TWCR &= ~((1<<TWSTA) | (1<<TWSTO));
 	TWCR |= ((1<<TWEA) | (1<<TWEN) | (1<<TWIE)); 
-	printf("Status: 0x%02x\n", TW_STATUS);
+#ifdef __AVR_ATmega16__
 	PORTC = 0x03;
+#else
+#error "Don't know how to set pullups for this chip, please add support"
+#endif
+}
+
+void i2c_send(unsigned char *buf, int len)
+{
+	uint8_t old_TWCR = TWCR;
+	uint8_t old_SREG = SREG;
+	int i;
+
+	cli();
+
+	TWCR = ((1<<TWINT) | (1<<TWSTA) | (1<<TWEN)); /* Send start */
+
+	while(!(TWCR & (1<<TWINT))) {}
+	if ((TW_STATUS & 0xf8) != TW_START)
+		goto out;
+
+	TWDR = buf[0]; /* SLA_W */
+	TWCR = ((1<<TWINT) | (1<<TWEN));
+
+	while(!(TWCR & (1<<TWINT))) {}
+	if ((TW_STATUS & 0xf8) != TW_MT_SLA_ACK)
+		goto out;
+	
+	for(i = 1; i < len; i++) {
+		TWDR = buf[i]; /* Send Data */
+		TWCR = ((1<<TWINT) | (1<<TWEN));
+
+		while(!(TWCR & (1<<TWINT))) {}
+		if ((TW_STATUS & 0xf8) != TW_MT_DATA_ACK)
+			goto out;
+	}
+
+	TWCR = ((1<<TWINT) | (1<<TWEN) | (1<<TWSTO));
+	while(TWCR & (1<<TWSTO)) {}
+
+#ifdef DEBUG
+	printf("I2C Data sent\n");
+#endif
+
+out:	
+	TWDR = 0x00;
+	TWCR = old_TWCR;
+	SREG = old_SREG;
 }
 
 ISR (TWI_vect, ISR_BLOCK)
 {
-	switch (TW_STATUS) {
+	if (i2c_done)
+		TWCR_RESET;
+
+	switch (TW_STATUS & 0xf8) {
 		case TW_SR_SLA_ACK:
 #ifdef DEBUG
 			printf("I2C: Slave 0x%02x adressed\n", TWDR);
 #endif
-			pos = 0x00;
+			i2c_pos = 0x00;
+			i2c_databuf[i2c_pos] = TWDR;
+			i2c_pos++;
 			TWCR_ACK;
 			break;
 
@@ -36,8 +91,13 @@ ISR (TWI_vect, ISR_BLOCK)
 #ifdef DEBUG
 			printf("I2C: Data received: 0x%02x\n", TWDR);
 #endif
-			databuf[pos] = TWDR;
-			pos++;
+			if (i2c_pos >= sizeof(i2c_databuf)) {
+				TWCR_RESET;
+				i2c_pos = 0x00;
+				break;
+			}
+			i2c_databuf[i2c_pos] = TWDR;
+			i2c_pos++;
 			TWCR_ACK;
 			break;
 
@@ -45,20 +105,16 @@ ISR (TWI_vect, ISR_BLOCK)
 #ifdef DEBUG
 			printf("I2C: STOP received\n");
 #endif
-			decode_bmc_cmd((unsigned char*)databuf, pos);
-			pos = 0x00;
+			i2c_len = i2c_pos;
+			i2c_pos = 0x00;
+			i2c_done = 0x01;
 			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);
+#ifdef DEBUG
+			printf("I2C: Unimplemented status 0x%02x\n", (TW_STATUS & 0xf8));
+#endif
 			TWCR_RESET;
 			break;
 	}