split out USB functions to separate file
[rigol] / rigol.c
1 /*
2 Sprite_tms hack to communicate with a Rigol DS1000-series scope using Linux.
3 This code is licensed under the GPL V3.
4
5 Warning: This code can in theory fubar the communications with the scope to a
6 point where the Linux USB-stack seems to get confused. Do a
7 rmmod uhci_hcd; modprobe uhci_hcd
8 (or alternately: use ohci_hcd) if that happens and you should be fine.
9 */
10
11 #include <usb.h>
12 #include <stdlib.h>
13 #include <stdio.h>
14 #include <string.h>
15 #include <sys/stat.h>
16 #include <sys/types.h>
17 #include <sys/wait.h>
18 #include <fcntl.h>
19 #include <unistd.h>
20 #include <signal.h>
21 #include <time.h>
22
23 #include <readline/readline.h>
24 #include <readline/history.h>
25
26 #include "usbtmc.h"
27 #include "png.h"
28
29
30 #define MIN(a,b) (((a)<(b))?(a):(b))
31
32 inline char printable (char ch)
33 {
34 if (ch < ' ') return '.';
35 if (ch > '~') return '.';
36 return ch;
37 }
38
39 //Debugging: Print a buffers contents in hex
40 void printb (unsigned char *pkt, int len)
41 {
42 int i, j;
43
44 for (i=0;i<len;i+= 16) {
45 printf ("%04x: ", i);
46 for (j=0;j < MIN(len-i, 16);j++) {
47 printf (" %02x", pkt[i+j]);
48 if (j == 7) printf (" ");
49 }
50 if (j < 7) printf (" ");
51 for (;j<17;j++)
52 printf (" ");
53
54 for (j=0;j < MIN(len-i, 16);j++) {
55 printf ("%c", printable (pkt[i+j]));
56 }
57 printf ("\n");
58 }
59 }
60
61 #define HAVE_READLINE
62 #ifndef HAVE_READLINE
63
64 char *readline (prompt)
65 {
66 char *buf;
67
68 printf (prompt);
69 fflush (stdout);
70 buf = malloc (1024);
71
72 if (fgets (buf, 1023, stdin) == NULL) {
73 free (buf);
74 return NULL;
75 }
76 l = strlen (buf);
77 if (buf[l-1] == '\n') {
78 buf[l] = 0;
79 }
80 return buf;
81 }
82
83 void add_history (char *buf)
84 {
85 }
86 #endif
87
88
89 void do_plot (struct usb_dev_handle *sc)
90 {
91 unsigned char ch1[1024], ch2[1024];
92 int i, l;
93
94 static FILE *gnuplot=NULL;
95 FILE *fp;
96
97 l = usbtmc_sendscpi(sc, ":WAV:DATA? CHANEL1", ch1, 1024);
98
99 if (l != 1024) {
100 printf ("hmm. didnt' get 1024 bytes. \n");
101 }
102
103 l = usbtmc_sendscpi(sc, ":WAV:DATA? CHANNEL2", ch2, 1024);
104
105 if (l != 1024) {
106 printf ("hmm. didnt' get 1024 bytes. \n");
107 }
108
109 if (!gnuplot) {
110 gnuplot = popen ("gnuplot", "w");
111 }
112
113 fp = fopen ("temp.dat", "w");
114 for (i=0xd4;i<0x32c;i++)
115 //for (i=0;i<0x400;i++)
116 fprintf (fp, "%d %d\n", 255 - ch1[i], 255 - ch2[i]);
117 fclose (fp);
118
119 fprintf (gnuplot, "plot 'temp.dat' using 1 with lines, 'temp.dat' using 2 with lines\n");
120 fflush (gnuplot);
121 }
122
123
124 #define ERROR -1e100
125
126 double get_float_from_scope (struct usb_dev_handle *sc, char *var)
127 {
128 unsigned char buf[1024];
129 double temp;
130 int l;
131
132 l = usbtmc_sendscpi(sc, var, buf, 1024);
133 if (l > 0) {
134 sscanf ((char*)buf, "%lf", &temp);
135 return temp;
136 }
137 return ERROR;
138 }
139
140
141 void do_get_buf (struct usb_dev_handle *sc)
142 {
143 FILE *fp;
144 int i, j, l, bp;
145 char buf[1024];
146 unsigned char ch1[1024];
147 unsigned char data[512*1024];
148 double sampfreq;
149
150 usbtmc_sendscpi (sc, ":STOP", NULL, 0);
151
152 sampfreq = get_float_from_scope (sc, ":ACQ:SAMP?");
153
154 printf ("Got sampling freq: %g\n", sampfreq);
155
156 sprintf (buf, ":TIM:SCAL %.15f", 50 / sampfreq);
157 printf ("sending scale cmd: %s\n", buf);
158 usbtmc_sendscpi (sc, buf, NULL, 0);
159
160 sleep (1);
161
162 bp=0;
163 for (i=-254*1024;i< 254*1024;i += 600) {
164 sprintf (buf, ":TIM:OFFSET %.15f", i / sampfreq);
165 printf ("Sending offset cmd: %s\n", buf);
166 usbtmc_sendscpi (sc, buf, NULL, 0);
167
168 l = usbtmc_sendscpi(sc, ":WAV:DATA? CHANEL1", ch1, 1024);
169
170 if (l != 1024) {
171 printf ("hmm. didnt' get 1024 bytes. \n");
172 }
173
174 for (j=0;j<600;j++)
175 data[bp++] = ch1[j+0xd4];
176 }
177 printf ("Got %d bytes of data. \n", bp);
178
179 fp = fopen ("ch1.dump", "w");
180 fwrite (data, bp, 1, fp);
181 fclose (fp);
182
183 usbtmc_sendscpi (sc, ":TIM:OFFSET 0", NULL, 0);
184 }
185
186 void do_get_screen(struct usb_dev_handle *sc)
187 {
188 unsigned char screen[320*234];
189 time_t lt;
190 char filename[256];
191 unsigned char *png;
192 int imglen;
193 int ret;
194 int l;
195 int fd;
196 pid_t display;
197
198 /* Hide "RMT" from screen */
199 l = usbtmc_sendscpi(sc, ":KEY:LOCK DISABLE", NULL, 0);
200 usleep(20000);
201
202 l = usbtmc_sendscpi(sc, ":LCD:DATA?", screen, sizeof(screen));
203
204 if (l != sizeof(screen)) {
205 printf ("hmm. didnt' get %d bytes, but %d\n\n", sizeof(screen), l);
206 }
207
208 png = lcd2png(screen, &imglen);
209
210 lt = time(NULL);
211 strftime(filename, sizeof(filename), "screen_%Y%m%d-%H%M%S.png", localtime(&lt));
212 fd=open(filename, O_CREAT|O_WRONLY, 0644);
213 if (fd == -1) {
214 perror("open");
215 exit(EXIT_FAILURE);
216 }
217
218 while(imglen > 0) {
219 ret = write(fd, png, imglen);
220 if (ret == -1) {
221 perror("write");
222 exit(EXIT_FAILURE);
223 }
224 imglen -= ret;
225 }
226 close(fd);
227 free(png);
228
229 printf("Waveform saved as %s\n", filename);
230
231 display = fork();
232 switch(display) {
233 case 0:
234 execlp("display", "display", filename, NULL);
235 exit(0);
236 break;
237 case -1:
238 perror("fork");
239 break;
240 default:
241 break;
242 }
243 }
244
245 void child_reaper(int sig)
246 {
247 pid_t child;
248
249 do {
250 child = waitpid(-1, NULL, WNOHANG);
251 } while(child > 0);
252
253 }
254
255 int main(int argc, char **argv)
256 {
257 struct usb_dev_handle *sc;
258 char *scpi;
259 unsigned char *buff;
260 int l;
261 struct sigaction act;
262
263 //Initialize scope
264 sc = usbtmc_initscope();
265 buff = malloc (1024*1024);
266 if (buff == NULL) {
267 perror("malloc");
268 exit(EXIT_FAILURE);
269 }
270
271 bzero(&act, sizeof(act));
272 act.sa_handler = child_reaper;
273 act.sa_flags = SA_NOCLDSTOP|SA_RESTART;
274 if (sigaction(SIGCHLD, &act, NULL) == -1) {
275 perror("sigaction");
276 exit(EXIT_FAILURE);
277 }
278
279 while (1) {
280 scpi = readline ("> ");
281
282 if (!scpi) break;
283 if (strlen (scpi) == 0) {
284 free (scpi);
285 continue;
286 }
287
288 add_history (scpi);
289
290 if (strncmp (scpi, "quit", 4) == 0) break;
291 if (strncmp (scpi, "plot", 4) == 0) {
292 do_plot (sc);
293 continue;
294 }
295 if (strncmp (scpi, "databuf", 7) == 0) {
296 do_get_buf (sc);
297 continue;
298 }
299 if (strncmp (scpi, "screen", 6) == 0) {
300 do_get_screen (sc);
301 continue;
302 }
303
304 l = strlen (scpi);
305 //printf ("got buf(%d): ", l);
306 //printb (scpi, l+2);
307 if (strchr (scpi, '?')) {
308 //printf ("Expecting reply\n");
309 l = usbtmc_sendscpi(sc, scpi, buff, 1024*1024);
310 //printf ("Got replylen = %d.\n", l);
311 buff[l] = 0; //zero-terminate
312 printb (buff, l);
313 } else {
314 //printf ("No reply expected\n");
315 l=usbtmc_sendscpi(sc,scpi,NULL,0);
316 }
317 free (scpi);
318 }
319 //Disable keylock, so the user doesn't have to press the 'force'-button
320 l=usbtmc_sendscpi(sc, ":KEY:LOCK DISABLE",NULL,0);
321
322 //Free up and exit
323 usb_release_interface(sc,0);
324 usb_close(sc);
325 return 0;
326 }
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