I2C master mode implemented and more decoding

diff --git a/bmc/Makefile b/bmc/Makefile
index 6f8b4ddde473b69e4c5df6007560a559b39dcb10..d9ad589182cf17e150276c61f7640b3c3cd89cc8 100644 (file)
--- a/bmc/Makefile
+++ b/bmc/Makefile
@@ -11,7 +11,7 @@ OBJCOPY=avr-objcopy
 
 all: bmc.bin
 
-bmc: bmc.o usart.o i2c.o
+bmc: bmc.o usart.o i2c.o ipmb.o
 
 bmc.bin: bmc
        $(OBJCOPY) -j .text -j .data -O binary $^ $@

diff --git a/bmc/bmc.c b/bmc/bmc.c
index 4db28a6fab3cb2c9408a38f7b39dcdd6da8cdc55..525785ec48cf81e3a6dc8d5f836fd902648d0624 100644 (file)
--- a/bmc/bmc.c
+++ b/bmc/bmc.c
@@ -6,42 +6,6 @@
 #include "i2c.h"
 #include "bmc.h"
 
-uint8_t ipmb_csum(unsigned char *buf, int len)
-{
-       uint8_t csum = 0x00;
-       int i;
-
-       for(i = 0; i < len; i++) {
-               csum += buf[i];
-       }
-
-       return -csum;
-}
-
-void decode_bmc_cmd(unsigned char *buf, int len)
-{
-       int i;
-
-       printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
-       printf("Connection Header:\n");
-       printf("\trs Slave Addr.: 0x%02x\n", buf[0]);
-       printf("\tnetFn: 0x%02x, LUN: 0x%02x\n", (buf[1]>>2)&0x3f, (buf[1] & 0x03));
-       printf("\tChecksum: 0x%02x (%s)\n", buf[2],
-               (buf[2] == ipmb_csum(buf, 2)) ? "OK" : "Wrong");
-       printf("Data:\n");
-       printf("\trq Slave Addr.: 0x%02x\n", buf[3]);
-       printf("\trqSeq: 0x%02x, rqLUN: 0x%02x\n", (buf[4]>>2)&0x3f, (buf[4] & 0x03));
-       printf("\tcmd: 0x%02x\n", buf[5]);
-       printf("\tData: ");
-       for(i = 6; i < (len - 1); i++) {
-               printf("0x%02x ", buf[i]);
-       }
-       printf("\n");
-       printf("\tChecksum: 0x%02x (%s)\n", buf[len-1],
-               (buf[len-1] == ipmb_csum(buf+3, len-4)) ? "OK" : "Wrong");
-       printf("<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
-}
-
 int main(void)
 {
        DDRB = 0xff;

diff --git a/bmc/bmc.h b/bmc/bmc.h
index 99d5810856e50075a6d1c10e7d5968f1887a001e..e69de29bb2d1d6434b8b29ae775ad8c2e48c5391 100644 (file)
--- a/bmc/bmc.h
+++ b/bmc/bmc.h
@@ -1 +0,0 @@
-void decode_bmc_cmd(unsigned char *buf, int len);

diff --git a/bmc/i2c.c b/bmc/i2c.c
index 4ada02e6c011ebf1cfd0e33c73563d2861885e05..6550c92fc62b084bc6d572cc8ae90b046e3d9045 100644 (file)
--- a/bmc/i2c.c
+++ b/bmc/i2c.c
@@ -2,7 +2,7 @@
 #include <avr/interrupt.h>
 #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);
@@ -21,6 +21,47 @@ void i2c_init()
        PORTC = 0x03;
 }
 
+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));
+
+       printf("I2C Data sent 0x%02x\n", TW_STATUS);
+
+
+out:   
+       TWDR = 0x00;
+       TWCR = old_TWCR;
+       SREG = old_SREG;
+}
+
 ISR (TWI_vect, ISR_BLOCK)
 {
        switch (TW_STATUS) {
@@ -47,7 +88,7 @@ ISR (TWI_vect, ISR_BLOCK)
 #ifdef DEBUG
                        printf("I2C: STOP received\n");
 #endif
-                       decode_bmc_cmd((unsigned char*)databuf, pos);
+                       decode_ipmb_pkt((unsigned char*)databuf, pos);
                        pos = 0x00;
                        TWCR_RESET;
                        break;

diff --git a/bmc/i2c.h b/bmc/i2c.h
index d666669bd23d5ef378cf5602a7754a83ef78b649..c53ff035ca2418df240512781bc242883d6319ef 100644 (file)
--- a/bmc/i2c.h
+++ b/bmc/i2c.h
@@ -1,3 +1,4 @@
 #define BMC_ADDR 0x24
 
 void i2c_init();
+void i2c_send(unsigned char *buf, int len);

diff --git a/bmc/ipmb.c b/bmc/ipmb.c
new file mode 100644 (file)
index 0000000..7d272fb
--- /dev/null
+++ b/bmc/ipmb.c
@@ -0,0 +1,56 @@
+#include <stdio.h>
+
+#include "ipmb.h"
+
+uint8_t ipmb_csum(unsigned char *buf, int len)
+{
+       uint8_t csum = 0x00;
+       int i;
+
+       for(i = 0; i < len; i++) {
+               csum += buf[i];
+       }
+
+       return -csum;
+}
+
+void decode_ipmb_pkt(unsigned char *buf, int len)
+{
+       int i;
+       struct ipmb_req req;
+
+       req.rsSA = buf[0];
+       req.netFn = (buf[1]>>2)&0x3f;
+       req.rsLUN = (buf[1] & 0x03);
+       req.rqSA = buf[3];
+       req.rqSEQ = (buf[4]>>2)&0x3f;
+       req.rqLUN = (buf[4] & 0x03);
+       req.cmd = buf[5];
+       req.data = buf+6;
+       req.datalen = len - 6 - 1;
+
+       printf(">>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>\n");
+       printf("Connection Header:\n");
+       printf("\trs Slave Addr.: 0x%02x\n", req.rsSA);
+       printf("\tnetFn: 0x%02x, LUN: 0x%02x\n", req.netFn, req.rsLUN);
+       printf("\tChecksum: 0x%02x (%s)\n", buf[2],
+               (buf[2] == ipmb_csum(buf, 2)) ? "OK" : "Wrong");
+       printf("Data:\n");
+       printf("\trq Slave Addr.: 0x%02x\n", req.rqSA);
+       printf("\trqSeq: 0x%02x, rqLUN: 0x%02x\n", req.rqSEQ, req.rqLUN);
+       printf("\tcmd: 0x%02x\n", req.cmd);
+       printf("\tData: ");
+       for(i = 0; i < req.datalen; i++) {
+               printf("0x%02x ", req.data[i]);
+       }
+       printf("\n");
+       printf("\tChecksum: 0x%02x (%s)\n", buf[len-1],
+               (buf[len-1] == ipmb_csum(buf+3, len-4)) ? "OK" : "Wrong");
+       printf("<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<\n");
+
+       if ((buf[2] != ipmb_csum(buf, 2)) ||
+           (buf[len-1] == ipmb_csum(buf+3, len-4)))
+               return; /* Checksum wrong */
+
+       //i2c_send((unsigned char*)"\x28\x00",1);
+}

diff --git a/bmc/ipmb.h b/bmc/ipmb.h
new file mode 100644 (file)
index 0000000..c48ad31
--- /dev/null
+++ b/bmc/ipmb.h
@@ -0,0 +1,13 @@
+struct ipmb_req {
+       uint8_t rsSA;
+       uint8_t netFn;
+       uint8_t rsLUN;
+       uint8_t rqSA;
+       uint8_t rqSEQ;
+       uint8_t rqLUN;
+       uint8_t cmd;
+       unsigned char *data;
+       uint8_t datalen;
+};
+
+void decode_ipmb_pkt(unsigned char *buf, int len);