unlock keyboard on release
[rigol] / usbtmc.c
1 #include <string.h>
2 #include <stdio.h>
3 #include <stdint.h>
4 #include <usb.h>
5 #include <arpa/inet.h>
6
7 #include "usbtmc.h"
8
9 //Helper-routine: Convert a little-endian 4-byte word to an int
10 static void int2chars(unsigned char *buff,unsigned int a) {
11 buff[3]=(a>>24)&0xff;
12 buff[2]=(a>>16)&0xff;
13 buff[1]=(a>>8)&0xff;
14 buff[0]=(a)&0xff;
15 }
16
17 //Helper-routine: Convert an int to little-endian 4-byte word
18 unsigned int chars2int(unsigned char *buff) {
19 unsigned int a;
20 a=buff[3]<<24;
21 a+=buff[2]<<16;
22 a+=buff[1]<<8;
23 a+=buff[0];
24 return a;
25 }
26
27 //This routine locates a scope by VID/PID and returns an opened handle to it.
28 static usb_dev_handle *usbtmc_find_scope() {
29 struct usb_bus *bus;
30 struct usb_device *dev=NULL;
31 usb_find_busses();
32 usb_find_devices();
33 for (bus=usb_busses; bus; bus=bus->next) {
34 for (dev=bus->devices; dev; dev=dev->next) {
35 //fprintf(stderr,"Prod/dev: %04X:%04X\n",dev->descriptor.idVendor,dev->descriptor.idProduct);
36 if (dev->descriptor.idVendor==0x400 && dev->descriptor.idProduct==0x5dc) {
37 return usb_open(dev);
38 }
39 }
40 }
41 return NULL;
42 }
43
44 //Send a scpi-command to the scope. The response goes into the buffer
45 //called resp, with a size of resplen. If resp==NULL, no response
46 //is requested.
47 int usbtmc_sendscpi(usb_dev_handle *dev, char* cmd,
48 unsigned char *resp, int resplen) {
49 unsigned char *buff;
50 int len,r,i;
51 int cmdlen = strlen(cmd);
52 static unsigned char seq=0;
53
54
55 buff=malloc(0x40);
56 seq++;
57 buff[0]=1; //func
58 buff[1]=seq; buff[2]=~seq; //nseq
59 buff[3]=0;
60 int2chars(buff+4, cmdlen);
61 buff[8]=1;
62 buff[9]=0x37;
63 buff[10]=0x39;
64 buff[11]=0x39;
65 //fprintf(stderr,"Writing header len=%d\n", cmdlen);
66 //printb(buff,12);
67 r=usb_bulk_write(dev, 1, (char*)buff, 12, 1000);
68 //fprintf(stderr,"%i bytes written. Writing cmd\n",r);
69 //printb(cmd, cmdlen);
70 r=usb_bulk_write(dev, 1, cmd, cmdlen, 1000);
71 //fprintf(stderr,"%i bytes written.\n",r);
72 if (resp != NULL && resplen != 0) {
73 //send read command
74 buff[0]=2; //func
75 seq++;
76 buff[1]=seq; buff[2]=~seq; //nseq
77 int2chars(buff+4,0x40);
78 buff[8]=1;
79 buff[9]=0xA;
80 buff[10]=0;
81 buff[11]=0;
82 //fprintf(stderr,"Writing resp req header\n");
83 //printb(buff,12);
84 r=usb_bulk_write(dev, 1, (char*)buff, 12, 1000);
85 //fprintf(stderr,"%i bytes written. Reading response hdr\n",r);
86 r=usb_bulk_read(dev, 2, (char*)buff, 0x40, 1000);
87 //printb(buff,r);
88 len=chars2int(buff+4);
89 //fprintf(stderr,"%i bytes read. Resplen=%i\n",r,len);
90 for (i=0; i<(r-12); i++) {
91 if (i<resplen) resp[i] = buff[i+12];
92 }
93 //printb(resp,r-12);
94 if (len > 0x40-12) {
95 //fprintf(stderr," Reading response:\n");
96 if (resplen<len) len=resplen;
97 r=usb_bulk_read(dev, 2, (char*)resp+(0x40-12), len-(0x40-12),1000);
98 //fprintf(stderr,"%i bytes read, wanted %i.\n", r, len-(0x40-12));
99 return r+(0x40-12);
100 }
101 return len;
102 }
103 return 0;
104 }
105
106 void usbtmc_claim(usb_dev_handle *sc)
107 {
108 usb_claim_interface(sc, 0);
109 }
110
111 void usbtmc_release(usb_dev_handle *sc)
112 {
113 //Disable keylock, so the user doesn't have to press the 'force'-button
114 usbtmc_sendscpi(sc, ":KEY:LOCK DISABLE",NULL,0);
115 usb_release_interface(sc, 0);
116 }
117
118 //Initialize the scope.
119 usb_dev_handle* usbtmc_initscope(void) {
120 int r;
121 unsigned char buff[10];
122 usb_dev_handle *dev;
123
124 //Init libusb
125 usb_init();
126 //Locate and open the scope
127 dev = usbtmc_find_scope();
128 if (!dev) {
129 printf("No scope found.\n");
130 exit(1);
131 } else {
132 printf("Scope found.\n");
133 }
134 usbtmc_claim(dev);
135 //The following code isn't really necessary, the program works
136 //OK without it too.
137 r=usb_control_msg(dev, 0xC8, 9, 0, 0, (char*)buff, 4, 1000);
138 usbtmc_release(dev);
139 if (r < 0) {
140 fprintf (stderr, "Error %d sending init message: %s\n",
141 r, strerror (-r));
142 fprintf (stderr, "Do you have permission on the USB device?\n");
143 exit (1);
144 }
145 if (chars2int(buff)!=0x40005dc) {
146 fprintf(stderr,"Init: buff[%i]=%x\n",r,chars2int(buff));
147 }
148 return dev;
149 }
150
151 void usbtmc_close(usb_dev_handle *sc)
152 {
153 //Free up and exit
154 usb_close(sc);
155 }
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