include stdint.h
[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 #define USB_TIMEOUT 50000
10
11 #if BYTE_ORDER == LITTLE_ENDIAN
12 #define LE32(x) x
13 #elif BYTE_ORDER == BIG_ENDIAN
14 #define LE32(x) ((uint32_t)((((uint32_t)x)>>24) | ((((uint32_t)x)>>8) & 0xff00) | ((((uint32_t)x)<<8) & 0xff0000) | (((uint32_t)x)<<24)))
15 #else
16 #error BYTE_ORDER not defined/known!
17 #endif
18
19 //Helper-routine: Convert a little-endian 4-byte word to an int
20 static void int2chars(unsigned char *buff,unsigned int a) {
21 buff[3]=(a>>24)&0xff;
22 buff[2]=(a>>16)&0xff;
23 buff[1]=(a>>8)&0xff;
24 buff[0]=(a)&0xff;
25 }
26
27 //Helper-routine: Convert an int to little-endian 4-byte word
28 unsigned int chars2int(unsigned char *buff) {
29 unsigned int a;
30 a=buff[3]<<24;
31 a+=buff[2]<<16;
32 a+=buff[1]<<8;
33 a+=buff[0];
34 return a;
35 }
36
37 //This routine locates a scope by VID/PID and returns an opened handle to it.
38 static usb_dev_handle *usbtmc_find_scope() {
39 struct usb_bus *bus;
40 struct usb_device *dev=NULL;
41 usb_find_busses();
42 usb_find_devices();
43 for (bus=usb_busses; bus; bus=bus->next) {
44 for (dev=bus->devices; dev; dev=dev->next) {
45 //fprintf(stderr,"Prod/dev: %04X:%04X\n",dev->descriptor.idVendor,dev->descriptor.idProduct);
46 if (dev->descriptor.idVendor==0x400 && dev->descriptor.idProduct==0x5dc) {
47 return usb_open(dev);
48 }
49 }
50 }
51 return NULL;
52 }
53
54 //Send a scpi-command to the scope. The response goes into the buffer
55 //called resp, with a size of resplen. If resp==NULL, no response
56 //is requested.
57 int usbtmc_sendscpi(usb_dev_handle *dev, char* cmd,
58 unsigned char *resp, int resplen) {
59 unsigned char *buff;
60 int len,r,i;
61 int cmdlen = strlen(cmd);
62 static unsigned char seq=0;
63
64
65 buff=malloc(0x40);
66 seq++;
67 buff[0]=1; //func
68 buff[1]=seq; buff[2]=~seq; //nseq
69 buff[3]=0;
70 int2chars(buff+4, cmdlen);
71 buff[8]=1;
72 buff[9]=0x00;
73 buff[10]=0x00;
74 buff[11]=0x00;
75 //fprintf(stderr,"Writing header len=%d\n", cmdlen);
76 //printb(buff,12);
77 r=usb_bulk_write(dev, 1, (char*)buff, 12, USB_TIMEOUT);
78 //fprintf(stderr,"%i bytes written. Writing cmd\n",r);
79 //printb(cmd, cmdlen);
80 r=usb_bulk_write(dev, 1, cmd, cmdlen, USB_TIMEOUT);
81 //fprintf(stderr,"%i bytes written.\n",r);
82 if (resp != NULL && resplen != 0) {
83 //send read command
84 buff[0]=2; //func
85 seq++;
86 buff[1]=seq; buff[2]=~seq; //nseq
87 int2chars(buff+4,0x40);
88 buff[8]=0;
89 buff[9]=0xA;
90 buff[10]=0;
91 buff[11]=0;
92 //fprintf(stderr,"Writing resp req header\n");
93 //printb(buff,12);
94 r=usb_bulk_write(dev, 1, (char*)buff, 12, USB_TIMEOUT);
95 //fprintf(stderr,"%i bytes written. Reading response hdr\n",r);
96 r=usb_bulk_read(dev, 2, (char*)buff, 0x40, USB_TIMEOUT);
97 //printb(buff,r);
98 len=chars2int(buff+4);
99 //fprintf(stderr,"%i bytes read. Resplen=%i\n",r,len);
100 for (i=0; i<(r-12); i++) {
101 if (i<resplen) resp[i] = buff[i+12];
102 }
103 //printb(resp,r-12);
104 if (len > 0x40-12) {
105 //fprintf(stderr," Reading response:\n");
106 if (resplen<len) len=resplen;
107 r=usb_bulk_read(dev, 2, (char*)resp+(0x40-12), len-(0x40-12), USB_TIMEOUT);
108 //fprintf(stderr,"%i bytes read, wanted %i.\n", r, len-(0x40-12));
109 return r+(0x40-12);
110 }
111 return len;
112 }
113 return 0;
114 }
115
116 void usbtmc_claim(usb_dev_handle *sc)
117 {
118 usb_claim_interface(sc, 0);
119 }
120
121 void usbtmc_release(usb_dev_handle *sc)
122 {
123 usb_release_interface(sc, 0);
124 }
125
126 //Initialize the scope.
127 usb_dev_handle* usbtmc_initscope(void) {
128 int r;
129 unsigned char buff[10];
130 usb_dev_handle *dev;
131
132 //Init libusb
133 usb_init();
134 //Locate and open the scope
135 dev = usbtmc_find_scope();
136 if (!dev) {
137 return NULL;
138 }
139 usbtmc_claim(dev);
140 //The following code isn't really necessary, the program works
141 //OK without it too.
142 r=usb_control_msg(dev, 0xC8, 9, 0, 0, (char*)buff, 4, USB_TIMEOUT);
143 usbtmc_release(dev);
144 if (r < 0) {
145 fprintf (stderr, "Error %d sending init message: %s\n",
146 r, strerror (-r));
147 fprintf (stderr, "Do you have permission on the USB device?\n");
148 exit (1);
149 }
150 if (chars2int(buff)!=0x40005dc) {
151 fprintf(stderr,"Init: buff[%i]=%x\n",r,chars2int(buff));
152 }
153 return dev;
154 }
155
156 void usbtmc_close(usb_dev_handle *sc)
157 {
158 //Free up and exit
159 usb_close(sc);
160 }
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