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58a9e276 MG |
1 | #include <string.h> |
2 | #include <stdio.h> | |
3 | #include <stdint.h> | |
4 | #include <usb.h> | |
5 | #include <arpa/inet.h> | |
6 | ||
7906b395 | 7 | #include "scope.h" |
58a9e276 MG |
8 | #include "usbtmc.h" |
9 | ||
7a226bb8 | 10 | #define USB_TIMEOUT 50000 |
165abe62 | 11 | |
ddf9f28b MG |
12 | #if BYTE_ORDER == LITTLE_ENDIAN |
13 | #define LE32(x) x | |
14 | #elif BYTE_ORDER == BIG_ENDIAN | |
15 | #define LE32(x) ((uint32_t)((((uint32_t)x)>>24) | ((((uint32_t)x)>>8) & 0xff00) | ((((uint32_t)x)<<8) & 0xff0000) | (((uint32_t)x)<<24))) | |
16 | #else | |
17 | #error BYTE_ORDER not defined/known! | |
18 | #endif | |
19 | ||
58a9e276 MG |
20 | //Helper-routine: Convert a little-endian 4-byte word to an int |
21 | static void int2chars(unsigned char *buff,unsigned int a) { | |
22 | buff[3]=(a>>24)&0xff; | |
23 | buff[2]=(a>>16)&0xff; | |
24 | buff[1]=(a>>8)&0xff; | |
25 | buff[0]=(a)&0xff; | |
26 | } | |
27 | ||
28 | //Helper-routine: Convert an int to little-endian 4-byte word | |
29 | unsigned int chars2int(unsigned char *buff) { | |
30 | unsigned int a; | |
31 | a=buff[3]<<24; | |
32 | a+=buff[2]<<16; | |
33 | a+=buff[1]<<8; | |
34 | a+=buff[0]; | |
35 | return a; | |
36 | } | |
37 | ||
38 | //This routine locates a scope by VID/PID and returns an opened handle to it. | |
39 | static usb_dev_handle *usbtmc_find_scope() { | |
40 | struct usb_bus *bus; | |
41 | struct usb_device *dev=NULL; | |
42 | usb_find_busses(); | |
43 | usb_find_devices(); | |
44 | for (bus=usb_busses; bus; bus=bus->next) { | |
45 | for (dev=bus->devices; dev; dev=dev->next) { | |
46 | //fprintf(stderr,"Prod/dev: %04X:%04X\n",dev->descriptor.idVendor,dev->descriptor.idProduct); | |
47 | if (dev->descriptor.idVendor==0x400 && dev->descriptor.idProduct==0x5dc) { | |
48 | return usb_open(dev); | |
49 | } | |
50 | } | |
51 | } | |
52 | return NULL; | |
53 | } | |
54 | ||
55 | //Send a scpi-command to the scope. The response goes into the buffer | |
56 | //called resp, with a size of resplen. If resp==NULL, no response | |
57 | //is requested. | |
7906b395 | 58 | int usbtmc_sendscpi(struct scope *sc, char* cmd, |
58a9e276 MG |
59 | unsigned char *resp, int resplen) { |
60 | unsigned char *buff; | |
61 | int len,r,i; | |
62 | int cmdlen = strlen(cmd); | |
63 | static unsigned char seq=0; | |
64 | ||
65 | ||
66 | buff=malloc(0x40); | |
67 | seq++; | |
68 | buff[0]=1; //func | |
69 | buff[1]=seq; buff[2]=~seq; //nseq | |
70 | buff[3]=0; | |
71 | int2chars(buff+4, cmdlen); | |
72 | buff[8]=1; | |
09268769 MG |
73 | buff[9]=0x00; |
74 | buff[10]=0x00; | |
75 | buff[11]=0x00; | |
58a9e276 MG |
76 | //fprintf(stderr,"Writing header len=%d\n", cmdlen); |
77 | //printb(buff,12); | |
7906b395 | 78 | r=usb_bulk_write(sc->usb.dev, 1, (char*)buff, 12, USB_TIMEOUT); |
58a9e276 MG |
79 | //fprintf(stderr,"%i bytes written. Writing cmd\n",r); |
80 | //printb(cmd, cmdlen); | |
7906b395 | 81 | r=usb_bulk_write(sc->usb.dev, 1, cmd, cmdlen, USB_TIMEOUT); |
58a9e276 MG |
82 | //fprintf(stderr,"%i bytes written.\n",r); |
83 | if (resp != NULL && resplen != 0) { | |
84 | //send read command | |
85 | buff[0]=2; //func | |
86 | seq++; | |
87 | buff[1]=seq; buff[2]=~seq; //nseq | |
88 | int2chars(buff+4,0x40); | |
09268769 | 89 | buff[8]=0; |
58a9e276 MG |
90 | buff[9]=0xA; |
91 | buff[10]=0; | |
92 | buff[11]=0; | |
93 | //fprintf(stderr,"Writing resp req header\n"); | |
94 | //printb(buff,12); | |
7906b395 | 95 | r=usb_bulk_write(sc->usb.dev, 1, (char*)buff, 12, USB_TIMEOUT); |
58a9e276 | 96 | //fprintf(stderr,"%i bytes written. Reading response hdr\n",r); |
7906b395 | 97 | r=usb_bulk_read(sc->usb.dev, 2, (char*)buff, 0x40, USB_TIMEOUT); |
58a9e276 MG |
98 | //printb(buff,r); |
99 | len=chars2int(buff+4); | |
100 | //fprintf(stderr,"%i bytes read. Resplen=%i\n",r,len); | |
101 | for (i=0; i<(r-12); i++) { | |
102 | if (i<resplen) resp[i] = buff[i+12]; | |
103 | } | |
104 | //printb(resp,r-12); | |
105 | if (len > 0x40-12) { | |
106 | //fprintf(stderr," Reading response:\n"); | |
107 | if (resplen<len) len=resplen; | |
7906b395 | 108 | r=usb_bulk_read(sc->usb.dev, 2, (char*)resp+(0x40-12), len-(0x40-12), USB_TIMEOUT); |
58a9e276 MG |
109 | //fprintf(stderr,"%i bytes read, wanted %i.\n", r, len-(0x40-12)); |
110 | return r+(0x40-12); | |
111 | } | |
112 | return len; | |
113 | } | |
114 | return 0; | |
115 | } | |
116 | ||
7906b395 | 117 | void usbtmc_claim(struct scope *sc) |
ad9fbc05 | 118 | { |
7906b395 | 119 | usb_claim_interface(sc->usb.dev, 0); |
ad9fbc05 MG |
120 | } |
121 | ||
7906b395 | 122 | void usbtmc_release(struct scope *sc) |
ad9fbc05 | 123 | { |
7906b395 | 124 | usb_release_interface(sc->usb.dev, 0); |
ad9fbc05 MG |
125 | } |
126 | ||
58a9e276 | 127 | //Initialize the scope. |
7906b395 | 128 | struct scope* usbtmc_initscope(void) { |
58a9e276 MG |
129 | int r; |
130 | unsigned char buff[10]; | |
131 | usb_dev_handle *dev; | |
7906b395 | 132 | struct scope *sc; |
58a9e276 MG |
133 | |
134 | //Init libusb | |
135 | usb_init(); | |
136 | //Locate and open the scope | |
137 | dev = usbtmc_find_scope(); | |
138 | if (!dev) { | |
2999345d | 139 | return NULL; |
58a9e276 | 140 | } |
7906b395 MG |
141 | |
142 | sc = calloc(1, sizeof(struct scope)); | |
143 | if (sc == NULL) { | |
144 | perror("calloc"); | |
145 | exit(EXIT_FAILURE); | |
146 | } | |
147 | ||
148 | sc->usb.dev = dev; | |
149 | ||
150 | usbtmc_claim(sc); | |
58a9e276 MG |
151 | //The following code isn't really necessary, the program works |
152 | //OK without it too. | |
7906b395 MG |
153 | r=usb_control_msg(sc->usb.dev, 0xC8, 9, 0, 0, (char*)buff, 4, USB_TIMEOUT); |
154 | usbtmc_release(sc); | |
58a9e276 MG |
155 | if (r < 0) { |
156 | fprintf (stderr, "Error %d sending init message: %s\n", | |
157 | r, strerror (-r)); | |
158 | fprintf (stderr, "Do you have permission on the USB device?\n"); | |
159 | exit (1); | |
160 | } | |
b74fea90 | 161 | if (chars2int(buff)!=0x40005dc) { |
58a9e276 MG |
162 | fprintf(stderr,"Init: buff[%i]=%x\n",r,chars2int(buff)); |
163 | } | |
7906b395 | 164 | return sc; |
58a9e276 | 165 | } |
b74fea90 | 166 | |
7906b395 | 167 | void usbtmc_close(struct scope *sc) |
b74fea90 MG |
168 | { |
169 | //Free up and exit | |
7906b395 | 170 | usb_close(sc->usb.dev); |
b74fea90 | 171 | } |