From f5a2aa532e12c8f242bd7b767702ac65f1a7d48d Mon Sep 17 00:00:00 2001
From: hackbard <hackbard@sage.physik.uni-augsburg.de>
Date: Wed, 1 Aug 2007 14:53:18 +0200
Subject: [PATCH] (ntested!) implementation of firmware_to_ram routine

---
 betty/lpcload.c | 109 +++++++++++++++++++++++++++++++++++-------------
 1 file changed, 79 insertions(+), 30 deletions(-)

diff --git a/betty/lpcload.c b/betty/lpcload.c
index 0bf3006..c2b1114 100644
--- a/betty/lpcload.c
+++ b/betty/lpcload.c
@@ -41,9 +41,11 @@
 
 #define CRYSTFREQ		"10000"
 
-#define BUFSIZE			64
+#define BUFSIZE			128
 
 typedef unsigned char u8;
+typedef unsigned short u16;
+typedef unsigned int u32;
 
 typedef struct s_lpc {
 	int sfd;		/* serial fd */
@@ -126,7 +128,7 @@ int open_firmware(t_lpc *lpc) {
 	return lpc->fwfd;
 }
 
-int txrx(t_lpc *lpc,u8 *buf,int len,u8 type) {
+int txrx(t_lpc *lpc,char *buf,int len,u8 type) {
 
 	int ret,cnt;
 	int i;
@@ -218,7 +220,7 @@ int txrx(t_lpc *lpc,u8 *buf,int len,u8 type) {
 
 int bl_init(t_lpc *lpc) {
 
-	u8 buf[BUFSIZE];
+	char buf[BUFSIZE];
 	int len;
 
 	/* auto baud sequence */
@@ -252,7 +254,7 @@ int bl_init(t_lpc *lpc) {
 
 int read_part_id(t_lpc *lpc) {
 
-	u8 buf[BUFSIZE];
+	char buf[BUFSIZE];
 
 	memcpy(buf,"J\r\n",3);
 	txrx(lpc,buf,3,TXRX_TYPE_CMD);
@@ -263,7 +265,7 @@ int read_part_id(t_lpc *lpc) {
 
 int read_bcv(t_lpc *lpc) {
 
-	u8 buf[BUFSIZE];
+	char buf[BUFSIZE];
 	char *ptr;
 
 	memcpy(buf,"K\r\n",3);
@@ -276,7 +278,7 @@ int read_bcv(t_lpc *lpc) {
 	return 0;
 }
 
-int uuencode(u8 *in,u8 *out) {
+int uuencode(u8 *in,char *out) {
 
 	out[0]=0x20+((in[0]>>2)&0x3f);
 	out[1]=0x20+(((in[0]<<4)|(in[1]>>4))&0x3f);
@@ -286,11 +288,11 @@ int uuencode(u8 *in,u8 *out) {
 	return 0;
 }
 
-int write_to_ram(t_lpc *lpc,u8 *buf,int addr,int len) {
+int write_to_ram(t_lpc *lpc,u8 *buf,u32 addr,int len) {
 
 	int lcount;
-	u8 checksum;
-	u8 txrxbuf[BUFSIZE];
+	u32 checksum;
+	char txrxbuf[BUFSIZE];
 	int count,bcnt;
 	int nlen,slen;
 	int i;
@@ -310,11 +312,8 @@ int write_to_ram(t_lpc *lpc,u8 *buf,int addr,int len) {
 	for(i=len;i<nlen;i++) buf[i]=0;
 
 	/* prepare write command */
-	snprintf(txrxbuf,BUFSIZE,"W %d %d",addr,len);
+	snprintf(txrxbuf,BUFSIZE,"W %d %d\r\n",addr,len);
 	slen=strlen(txrxbuf);
-	txrxbuf[slen]='\r';
-	txrxbuf[slen+1]='\0';
-	slen+=2;
 
 	/* send command and check return code */
 	txrx(lpc,txrxbuf,slen,TXRX_TYPE_CMD);
@@ -347,10 +346,11 @@ int write_to_ram(t_lpc *lpc,u8 *buf,int addr,int len) {
 		count+=3;
 
 		/* checksum */
-		if(!(lcount%20)) {
+		if((!(lcount%20))|(bcnt==nlen)) {
 			/* send checksum */
-			txrxbuf[0]=checksum;
-			txrx(lpc,txrxbuf,1,TXRX_TYPE_CMD);
+			snprintf(txrxbuf,BUFSIZE,"%d\r\n",checksum);
+			slen=strlen(txrxbuf);
+			txrx(lpc,txrxbuf,slen,TXRX_TYPE_CMD);
 			if(!strncmp(txrxbuf,"RESEND\r\n",8)) {
 				printf("ram write: resending ...\n");
 				bcnt-=count;
@@ -371,25 +371,74 @@ int write_to_ram(t_lpc *lpc,u8 *buf,int addr,int len) {
 
 int firmware_to_ram(t_lpc *lpc) {
 
-	char line[BUFSIZE];
 	char buf[BUFSIZE];
+	u8 data[BUFSIZE];
+	u32 addr,len,type,val;
+	u8 cksum;
+	int ret,i;
 
-	/* read file */
+	/* read a line */
 	while(ret) {
-		/* read line */
-		while(ret) {
-			ret=read(lpc->fwfd,line,1);
-			if(line[0]!=':') {
+		/* sync line */
+		ret=read(lpc->fwfd,buf,1);
+		switch(buf[0]) {
+			case '\r':
+				continue;
+			case '\n':
+				continue;
+			case ':':
+				/* start code */
+				break;
+			default:
 				printf("fw to ram: no ihex format\n");
 				return -1;
-			}
-			ret=read(lpc->fwfd,line+1,2);
-			line[3]='\0';
-			len=atoi(line+1);
-			ret=read(lpc->fwfd,line+3,4);
-			line[7]='\0';
-			addr=strtol(line+3);
-
+		}
+		/* read len */
+		ret=read(lpc->fwfd,buf,2);
+		sscanf(buf,"%02x",&len);
+		if(len%4) {
+			printf("fw to ram: len not a multiple of 4\n");
+			return -1;
+		}
+		/* read addr */
+		ret=read(lpc->fwfd,buf,4);
+		sscanf(buf,"%04x",&addr);
+		/* read type */
+		ret=read(lpc->fwfd,buf,2);
+		sscanf(buf,"%02x",&type);
+		/* successfull return if type is end of file */
+		if(type==0x01)
+			return 0;
+		/* read data */
+		ret=read(lpc->fwfd,buf,2*len);
+		if(ret!=(2*len)) {
+			printf("fw to ram: data missing\n");
+				return -1;
+		}
+		/* checksum */
+		cksum=0;
+		for(i=0;i<len;i++) {
+			sscanf(buf+2*i,"%02x",&val);
+			data[i]=val;
+			cksum+=data[i];
+		}
+		ret=read(lpc->fwfd,buf,2);
+		sscanf(buf,"%02x",&val);
+		if(val+cksum!=0x100) {
+			printf("fw to ram: wrong checksum\n");
+			return -1;
+		}
+		/* act according to type */
+		switch(type) {
+			case 0x03:
+				/* get cs and ip */
+				break;
+			case 0x00:
+				write_to_ram(lpc,data,addr,len);
+				break;
+			default:
+				printf("fw to ram: unknown type %02x\n",type);
+				return -1;
 		}
 	}
 
-- 
2.39.2