+#include <string.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <usb.h>
+#include <arpa/inet.h>
+
+#include "usbtmc.h"
+
+//Helper-routine: Convert a little-endian 4-byte word to an int
+static void int2chars(unsigned char *buff,unsigned int a) {
+ buff[3]=(a>>24)&0xff;
+ buff[2]=(a>>16)&0xff;
+ buff[1]=(a>>8)&0xff;
+ buff[0]=(a)&0xff;
+}
+
+//Helper-routine: Convert an int to little-endian 4-byte word
+unsigned int chars2int(unsigned char *buff) {
+ unsigned int a;
+ a=buff[3]<<24;
+ a+=buff[2]<<16;
+ a+=buff[1]<<8;
+ a+=buff[0];
+ return a;
+}
+
+//This routine locates a scope by VID/PID and returns an opened handle to it.
+static usb_dev_handle *usbtmc_find_scope() {
+ struct usb_bus *bus;
+ struct usb_device *dev=NULL;
+ usb_find_busses();
+ usb_find_devices();
+ for (bus=usb_busses; bus; bus=bus->next) {
+ for (dev=bus->devices; dev; dev=dev->next) {
+ //fprintf(stderr,"Prod/dev: %04X:%04X\n",dev->descriptor.idVendor,dev->descriptor.idProduct);
+ if (dev->descriptor.idVendor==0x400 && dev->descriptor.idProduct==0x5dc) {
+ return usb_open(dev);
+ }
+ }
+ }
+ return NULL;
+}
+
+//Send a scpi-command to the scope. The response goes into the buffer
+//called resp, with a size of resplen. If resp==NULL, no response
+//is requested.
+int usbtmc_sendscpi(usb_dev_handle *dev, char* cmd,
+ unsigned char *resp, int resplen) {
+ unsigned char *buff;
+ int len,r,i;
+ int cmdlen = strlen(cmd);
+ static unsigned char seq=0;
+
+
+ buff=malloc(0x40);
+ seq++;
+ buff[0]=1; //func
+ buff[1]=seq; buff[2]=~seq; //nseq
+ buff[3]=0;
+ int2chars(buff+4, cmdlen);
+ buff[8]=1;
+ buff[9]=0x37;
+ buff[10]=0x39;
+ buff[11]=0x39;
+ //fprintf(stderr,"Writing header len=%d\n", cmdlen);
+ //printb(buff,12);
+ r=usb_bulk_write(dev, 1, (char*)buff, 12, 1000);
+ //fprintf(stderr,"%i bytes written. Writing cmd\n",r);
+ //printb(cmd, cmdlen);
+ r=usb_bulk_write(dev, 1, cmd, cmdlen, 1000);
+ //fprintf(stderr,"%i bytes written.\n",r);
+ if (resp != NULL && resplen != 0) {
+ //send read command
+ buff[0]=2; //func
+ seq++;
+ buff[1]=seq; buff[2]=~seq; //nseq
+ int2chars(buff+4,0x40);
+ buff[8]=1;
+ buff[9]=0xA;
+ buff[10]=0;
+ buff[11]=0;
+ //fprintf(stderr,"Writing resp req header\n");
+ //printb(buff,12);
+ r=usb_bulk_write(dev, 1, (char*)buff, 12, 1000);
+ //fprintf(stderr,"%i bytes written. Reading response hdr\n",r);
+ r=usb_bulk_read(dev, 2, (char*)buff, 0x40, 1000);
+ //printb(buff,r);
+ len=chars2int(buff+4);
+ //fprintf(stderr,"%i bytes read. Resplen=%i\n",r,len);
+ for (i=0; i<(r-12); i++) {
+ if (i<resplen) resp[i] = buff[i+12];
+ }
+ //printb(resp,r-12);
+ if (len > 0x40-12) {
+ //fprintf(stderr," Reading response:\n");
+ if (resplen<len) len=resplen;
+ r=usb_bulk_read(dev, 2, (char*)resp+(0x40-12), len-(0x40-12),1000);
+ //fprintf(stderr,"%i bytes read, wanted %i.\n", r, len-(0x40-12));
+ return r+(0x40-12);
+ }
+ return len;
+ }
+ return 0;
+}
+
+//Initialize the scope.
+usb_dev_handle* usbtmc_initscope(void) {
+ int r;
+ unsigned char buff[10];
+ usb_dev_handle *dev;
+
+ //Init libusb
+ usb_init();
+ //Locate and open the scope
+ dev = usbtmc_find_scope();
+ if (!dev) {
+ printf("No scope found.\n");
+ exit(1);
+ } else {
+ printf("Scope found.\n");
+ }
+ usb_claim_interface(dev,0);
+ //The following code isn't really necessary, the program works
+ //OK without it too.
+ r=usb_control_msg(dev, 0xC8, 9, 0, 0, (char*)buff, 4, 1000);
+ if (r < 0) {
+ fprintf (stderr, "Error %d sending init message: %s\n",
+ r, strerror (-r));
+ fprintf (stderr, "Do you have permission on the USB device?\n");
+ exit (1);
+ }
+ if (chars2int(buff)!=0x40004dc) {
+ fprintf(stderr,"Init: buff[%i]=%x\n",r,chars2int(buff));
+ }
+ return dev;
+}
projects / rigol / commitdiff