X-Git-Url: https://hackdaworld.org/gitweb/?p=rfid%2Flibrfid.git;a=blobdiff_plain;f=gemtag%2Fgemtag.c;h=db4823e52f32baf31b80a5dad240937115445998;hp=28538c77098921f5a93d911ccb95852cb76159b8;hb=3ca43b53eb696fea7ea7f6a14ed4e1bfa7b01ac7;hpb=c8c92a9a0bb6354e1740a838b3f51000b59f4e97

diff --git a/gemtag/gemtag.c b/gemtag/gemtag.c
index 28538c7..db4823e 100644
--- a/gemtag/gemtag.c
+++ b/gemtag/gemtag.c
@@ -1,5 +1,5 @@
 /*
- * (C) 2006 by Frank Zirkelbach <hackbard@hackdaworld.org>
+ *  (C) 2006 by Frank Zirkelbach <hackbard@hackdaworld.org>
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License version 2 
@@ -24,15 +24,16 @@
 #include <usb.h>
 #include "gemtag.h"
 
-/* variables */
+int hexdump(unsigned char *data,int len) {
+	int i;
 
-struct gemtag_handle {
-	struct usb_dev_handle *handle;
-};
+	for(i=0;i<len;i++) printf("%02x ",data[i]);
+	printf("\n");
 
-/* functions */
+	return 0;
+}
 
-struct usb_device *find_device(unsigned short vendor, unsigned short device) {
+struct usb_device *find_device(unsigned short vendor,unsigned short device) {
 	
 	struct usb_bus *bus;
 	struct usb_device *dev;
@@ -51,13 +52,112 @@ struct usb_device *find_device(unsigned short vendor, unsigned short device) {
 	return NULL;
 }
 
+u_int16_t gemtag_calc_crc(unsigned char *data,u_int16_t len) {
+
+	u_int16_t crc_polynom;
+	u_int16_t crc_preset;
+	u_int16_t crc;
+	int i,j;
+		
+	crc_polynom=0x8408;
+	crc_preset=0xffff;
+	crc=0xffff;
+
+	for(i=0;i<len;i++) {
+		crc^=data[i];
+		for(j=0;j<8;j++) {
+			if(crc&0x0001)
+				crc=(crc>>1)^crc_polynom;
+			else
+				crc=(crc>>1);
+		}
+	}
+	return crc;
+}
+
+int gemtag_transcieve(struct gemtag_handle *gh,unsigned char cmd,
+                         unsigned char *tx,unsigned int tx_len,
+                         unsigned char *rx,unsigned int *rx_len) {
+
+	unsigned char txbuf[256];
+	unsigned char rxbuf[256];
+	struct gemtag_cmd_hdr *txhdr;
+	struct gemtag_cmd_hdr *rxhdr;
+	unsigned char buf[32];
+	u_int16_t crc,*crcptr;
+	int ret,size;
+
+	txhdr=(struct gemtag_cmd_hdr *)txbuf;
+	rxhdr=(struct gemtag_cmd_hdr *)rxbuf;
+
+	txhdr->start=0xa5;
+	txhdr->seq=++(gh->seq);
+	txhdr->cmd=cmd;
+ 	txhdr->len=(tx_len>>8)|(tx_len<<8);
+	size=sizeof(struct gemtag_cmd_hdr);
+	memcpy(txbuf+size,tx,tx_len);
+	size+=tx_len;
+
+	/* crc check */
+	if(gh->capabilities&GEMTAG_CAP_CRC) {
+		crcptr=(u_int16_t *)(txbuf+size);
+		crc=gemtag_calc_crc(txbuf,size);
+		*crcptr=(crc>>8)|(crc<<8);
+		size+=2;
+	}
+
+	/* usb write */
+	printf("(%02d) -> ",size);
+	hexdump(txbuf,size);
+	ret=usb_interrupt_write(gh->handle,0x02,txbuf,size,0);
+	if(ret<=0) {
+		perror("usb interrupt write");
+		return ret;
+	}
+
+	/* usb read */
+	ret=usb_interrupt_read(gh->handle,0x81,buf,32,0);
+	if(ret<=0) {
+		perror("usb interrupt read");
+		return ret;
+	}
+	memcpy(rxbuf,buf,ret);
+	printf("(%02d) <- ",ret);
+	hexdump(rxbuf,ret);
+
+	*rx_len=buf[3]|(buf[4]<<8);
+	printf("debug: length according to header -> %d 0x%04x\n",
+	       *rx_len,*rx_len);
+	size=*rx_len+5;
+
+	/* crc check */
+	if(gh->capabilities&GEMTAG_CAP_CRC) {
+		size=ret-2;
+		crcptr=(u_int16_t *)(rxbuf+size);
+		crc=gemtag_calc_crc(rxbuf,size);
+		if(((crc>>8)!=rxbuf[size+1])||((crc&0xff)!=rxbuf[size])) {
+			printf("bad crc! (%04x)\n",crc);
+			//return -BAD_CRC;
+		}
+	}
+
+	/* check sequence number */	
+	if(rxhdr->seq!=txhdr->seq) {
+		puts("transmitted/recieved sequence number do not match");
+		//return -SEQ_MISMATCH;
+	}
+
+	memcpy(rx,rxbuf+sizeof(struct gemtag_cmd_hdr),*rx_len);
+
+	return 0;
+}
+
 struct gemtag_handle *gemtag_open(void) {
 	struct usb_device *gemtag;
-	unsigned char rbuf[16];
-	unsigned int rlen;
-	unsigned int i,numconf;
-	unsigned int j,numint;
+	unsigned char rbuf[256];
+	unsigned int i,rlen;
 	struct gemtag_handle *gh;
+	char info[64];
 
 	rlen=sizeof(rbuf);
 
@@ -65,7 +165,7 @@ struct gemtag_handle *gemtag_open(void) {
 	usb_find_busses();
 	usb_find_devices();
 
-	gemtag=find_device(USB_VENDOR_GEMTAG, USB_DEVICE_X501);
+	gemtag=find_device(USB_VENDOR_GEMTAG,USB_DEVICE_X501);
 	if(!gemtag) return NULL;
 
 	gh=malloc(sizeof(struct gemtag_handle));
@@ -73,23 +173,42 @@ struct gemtag_handle *gemtag_open(void) {
 
 	memset(gh,0,sizeof(struct gemtag_handle));
 
-	numconf=gemtag->descriptor.bNumConfigurations;
-	printf("found gemtag, %u configurations\n",numconf);
-	for(i=0;i<numconf;i++) {
-		numint=gemtag->config[i].bNumInterfaces;
-		printf("config %u [nr %u] has %u interfaces\n",
-		       i,gemtag->config[i].bConfigurationValue,
-		       numint);
-		for(j=0;j<numint;j++) {
-			printf("config %u interface %u has %u altsettings\n",
-			       i,j,gemtag->config[i].interface[j].num_altsetting);
-		}
-	}
-
 	gh->handle=usb_open(gemtag);
 	if(!gh->handle)
 		goto out_free;
 
+	for(i=1;i<4;i++) {
+		memset(info,0,sizeof(info));
+		usb_get_string_simple(gh->handle,i,info,sizeof(info));
+		printf("%s ",info);
+	}
+	printf("opened successfully\n");
+
+	if(usb_set_configuration(gh->handle,1)) {
+		perror("set config");
+		goto out_free;
+	}
+	printf("set configuration 1, ");
+
+	if(usb_claim_interface(gh->handle,0)) {
+		perror("claim interface");
+		goto out_free;
+	}
+	printf("claimed interface 0, ");
+
+	// while(usb_set_altinterface(gh->handle,0))
+	// 	printf("trying to set alt interface\n");
+	// printf("activated alt setting 0\n");
+
+	gh->capabilities|=GEMTAG_CAP_CRC;
+
+	gemtag_transcieve(gh,GEMTAG_CMD_GET_FW_VERSION,
+	                  NULL,0,rbuf,&rlen);
+	gemtag_transcieve(gh,GEMTAG_CMD_GET_SERIAL_NUMBER,
+	                  NULL,0,rbuf,&rlen);
+
+	return gh;
+
 out_free:
 	free(gh);
 	return NULL;