X-Git-Url: https://hackdaworld.org/gitweb/?p=rfid%2Flibrfid.git;a=blobdiff_plain;f=gemtag%2Fgemtag.c;fp=gemtag%2Fgemtag.c;h=9656f019614340014e29fde2c4ad931a744cb8f5;hp=28538c77098921f5a93d911ccb95852cb76159b8;hb=52d5cce98a304aff9e9e1f98e345432d7bf62a8d;hpb=c8c92a9a0bb6354e1740a838b3f51000b59f4e97

diff --git a/gemtag/gemtag.c b/gemtag/gemtag.c
index 28538c7..9656f01 100644
--- a/gemtag/gemtag.c
+++ b/gemtag/gemtag.c
@@ -24,15 +24,17 @@
 #include <usb.h>
 #include "gemtag.h"
 
-/* variables */
+int hexdump(unsigned char *data,int len) {
+	int i;
 
-struct gemtag_handle {
-	struct usb_dev_handle *handle;
-};
+	printf("dump: ");
+	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;
@@ -51,6 +53,91 @@ 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;
+	u_int16_t *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=htons(tx_len);
+	size=sizeof(struct gemtag_cmd_hdr);
+	memcpy(txbuf+size,tx,tx_len);
+
+	/* crc check */
+	gh->capabilities=GEMTAG_CAP_CRC;
+	if(gh->capabilities&GEMTAG_CAP_CRC) {
+		size+=tx_len;
+		crcptr=(u_int16_t *)(txbuf+size);
+		*crcptr=gemtag_calc_crc(txbuf,size);
+		size+=2;
+	}
+
+	/* usb write */
+	hexdump(txbuf,size);
+	ret=usb_bulk_write(gh->handle,0x02,txbuf,size,0);
+	if(ret<0) {
+		perror("usb bulk write");
+		return ret;
+	}
+	printf("write of %d bytes successfull\n",ret);
+
+	/* usb read */
+	ret=usb_bulk_read(gh->handle,0x81,rxbuf,sizeof(rxbuf),0);
+	size=ret;
+	if(ret<0) {
+		perror("usb bulk read");
+		return ret;
+	}
+	printf("received %d bytes\n",ret);
+	
+	if(rxhdr->seq!=txhdr->seq)
+		puts("transmitted/recieved header are not equal");
+
+	/* crc check */
+	
+
+	*rx_len=ntohs(rxhdr->len);
+	memcpy(rx,rxbuf+sizeof(struct gemtag_cmd_hdr),
+	       ret-sizeof(struct gemtag_cmd_hdr)+2);
+	hexdump(rxbuf,ret+2);
+
+	return 0;
+}
+
 struct gemtag_handle *gemtag_open(void) {
 	struct usb_device *gemtag;
 	unsigned char rbuf[16];
@@ -74,14 +161,14 @@ struct gemtag_handle *gemtag_open(void) {
 	memset(gh,0,sizeof(struct gemtag_handle));
 
 	numconf=gemtag->descriptor.bNumConfigurations;
-	printf("found gemtag, %u configurations\n",numconf);
+	printf("found gemtag, %u configuration(s)\n",numconf);
 	for(i=0;i<numconf;i++) {
 		numint=gemtag->config[i].bNumInterfaces;
-		printf("config %u [nr %u] has %u interfaces\n",
+		printf("config %u [nr %u] has %u interface(s)\n",
 		       i,gemtag->config[i].bConfigurationValue,
 		       numint);
 		for(j=0;j<numint;j++) {
-			printf("config %u interface %u has %u altsettings\n",
+			printf("config %u interface %u has %u altsetting(s)\n",
 			       i,j,gemtag->config[i].interface[j].num_altsetting);
 		}
 	}
@@ -89,6 +176,32 @@ struct gemtag_handle *gemtag_open(void) {
 	gh->handle=usb_open(gemtag);
 	if(!gh->handle)
 		goto out_free;
+	puts("usb_open successfull");
+
+	if(usb_set_configuration(gh->handle,1)) {
+		perror("set config");
+		goto out_free;
+	}
+	puts("configuration 1 successfully set");
+
+	if(usb_claim_interface(gh->handle,0)) {
+		perror("claim interface");
+		goto out_free;
+	}
+	puts("interface 0 claimed");
+
+/*	if(usb_set_altinterface(gh->handle,1)) {
+		perror("set alt interface");
+		goto out_free;
+	}
+	puts("alt setting 1 selected");
+*/
+
+	gh->capabilities|=GEMTAG_CAP_CRC;
+
+	gemtag_transcieve(gh,0x22,NULL,0,rbuf,&rlen);
+
+	return gh;
 
 out_free:
 	free(gh);