[rigol] / rigol.c

/*
Sprite_tms hack to communicate with a Rigol DS1000-series scope using Linux. 
This code is licensed under the GPL V3.

Warning: This code can in theory fubar the communications with the scope to a
point where the Linux USB-stack seems to get confused. Do a 
rmmod uhci_hcd; modprobe uhci_hcd
(or alternately: use ohci_hcd) if that happens and you should be fine.
 */

#include <usb.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <fcntl.h>
#include <unistd.h>
#include <signal.h>
#include <time.h>

#include <readline/readline.h>
#include <readline/history.h>

#include "png.h"


//This routine locates a scope by VID/PID and returns an opened handle to it.
usb_dev_handle *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;
}

//Helper-routine: Convert a little-endian 4-byte word to an int
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;
}

#define MIN(a,b) (((a)<(b))?(a):(b))

inline char printable (char ch)
{
	if (ch < ' ') return '.';
	if (ch > '~') return '.';
	return ch;
}

//Debugging: Print a buffers contents in hex
void printb (unsigned char *pkt, int len)
{
	int i, j;

	for (i=0;i<len;i+= 16) {
		printf ("%04x:  ", i);
		for (j=0;j < MIN(len-i, 16);j++) {
			printf (" %02x", pkt[i+j]);
			if (j == 7) printf ("  ");
		}
		if (j < 7) printf ("  ");
		for (;j<17;j++)
			printf ("   ");

		for (j=0;j < MIN(len-i, 16);j++) {
			printf ("%c", printable (pkt[i+j]));
		}
		printf ("\n");
	}
}

//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 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.
void initscope(usb_dev_handle *dev) {
	int r;
	unsigned char buff[10];
	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;
}

#define HAVE_READLINE
#ifndef HAVE_READLINE

char *readline (prompt)
{
	char *buf;

	printf (prompt); 
	fflush (stdout); 
	buf = malloc (1024); 

	if (fgets (buf, 1023, stdin) == NULL) {
		free (buf); 
		return NULL; 
	}
	l = strlen (buf); 
	if (buf[l-1] == '\n') {
		buf[l] = 0;
	}
	return buf; 
}

void add_history (char *buf)
{
}
#endif


void do_plot (struct usb_dev_handle *sc)
{
	unsigned char ch1[1024], ch2[1024];
	int i, l;

	static FILE *gnuplot=NULL;
	FILE *fp;

	l = sendscpi(sc, ":WAV:DATA? CHANEL1", ch1, 1024);

	if (l != 1024) {
		printf ("hmm. didnt' get 1024 bytes. \n"); 
	}

	l = sendscpi(sc, ":WAV:DATA? CHANNEL2", ch2, 1024);

	if (l != 1024) {
		printf ("hmm. didnt' get 1024 bytes. \n"); 
	}

	if (!gnuplot) {
		gnuplot = popen ("gnuplot", "w"); 
	}

	fp = fopen ("temp.dat", "w");
	for (i=0xd4;i<0x32c;i++)
		//for (i=0;i<0x400;i++)
		fprintf (fp, "%d %d\n", 255 - ch1[i], 255 - ch2[i]);
	fclose (fp); 

	fprintf (gnuplot, "plot 'temp.dat' using 1 with lines, 'temp.dat' using 2 with lines\n");
	fflush (gnuplot);
}


#define ERROR -1e100

double get_float_from_scope (struct usb_dev_handle *sc, char *var)
{
	unsigned char buf[1024];
	double temp;
	int l;

	l = sendscpi(sc, var, buf, 1024);
	if (l > 0) {
		sscanf ((char*)buf, "%lf", &temp); 
		return temp;
	}
	return ERROR;
}


void do_get_buf (struct usb_dev_handle *sc)
{
	FILE *fp;
	int i, j, l, bp;
	char buf[1024];
	unsigned char ch1[1024];
	unsigned char data[512*1024];
	double sampfreq;

	sendscpi (sc, ":STOP", NULL, 0); 

	sampfreq = get_float_from_scope (sc, ":ACQ:SAMP?");

	printf ("Got sampling freq: %g\n", sampfreq);  

	sprintf (buf, ":TIM:SCAL %.15f", 50 / sampfreq);
	printf ("sending scale cmd: %s\n", buf); 
	sendscpi (sc, buf, NULL, 0);

	sleep (1);

	bp=0;
	for (i=-254*1024;i< 254*1024;i += 600) {
		sprintf (buf, ":TIM:OFFSET %.15f", i / sampfreq);
		printf ("Sending offset cmd:  %s\n", buf); 
		sendscpi (sc, buf, NULL, 0);

		l = sendscpi(sc, ":WAV:DATA? CHANEL1", ch1, 1024);

		if (l != 1024) {
			printf ("hmm. didnt' get 1024 bytes. \n"); 
		}

		for (j=0;j<600;j++)
			data[bp++] = ch1[j+0xd4];
	}
	printf ("Got %d bytes of data. \n", bp);

	fp = fopen ("ch1.dump", "w");
	fwrite (data, bp, 1, fp);
	fclose (fp); 

	sendscpi (sc, ":TIM:OFFSET 0", NULL, 0);
}

void do_get_screen(struct usb_dev_handle *sc)
{
	unsigned char screen[320*234];
	time_t lt;
	char filename[256];
	unsigned char *png;
	int imglen;
	int ret;
	int l;
	int fd;
	pid_t display;

	/* Hide "RMT" from screen */
	l = sendscpi(sc, ":KEY:LOCK DISABLE", NULL, 0); 
	usleep(20000);

	l = sendscpi(sc, ":LCD:DATA?", screen, sizeof(screen));

	if (l != sizeof(screen)) {
		printf ("hmm. didnt' get %d bytes, but %d\n\n", sizeof(screen), l); 
	}

	png = lcd2png(screen, &imglen);

	lt = time(NULL);
	strftime(filename, sizeof(filename), "screen_%Y%m%d-%H%M%S.png", localtime(&lt));
	fd=open(filename, O_CREAT|O_WRONLY, 0644);
	if (fd == -1) {
		perror("open");
		exit(EXIT_FAILURE);
	}

	while(imglen > 0) {
		ret = write(fd, png, imglen);
		if (ret == -1) {
			perror("write");
			exit(EXIT_FAILURE);
		}
		imglen -= ret;
	}
	close(fd);
	free(png);

	printf("Waveform saved as %s\n", filename);

	display = fork();
	switch(display) {
		case 0:
			execlp("display", "display", filename, NULL);
			exit(0);
			break;
		case -1:
			perror("fork");
			break;
		default:
			break;
	}
}

void child_reaper(int sig)
{
	pid_t child;

	do {
		child = waitpid(-1, NULL, WNOHANG);
	} while(child > 0);
	
}

int main(int argc, char **argv) 
{
	struct usb_dev_handle *sc;
	char *scpi;
	unsigned char *buff;
	int l;
	struct sigaction act;

	//Init libusb
	usb_init();
	//Locate and open the scope
	sc=find_scope();
	if (!sc) {
		printf("No scope found.\n");
		exit(1);
	} else {
		printf("Scope found.\n");
	}
	//Initialize scope
	initscope(sc);
	buff = malloc (1024*1024); 
	if (buff == NULL) {
		perror("malloc");
		exit(EXIT_FAILURE);
	}

	bzero(&act, sizeof(act));
	act.sa_handler = child_reaper;
	act.sa_flags = SA_NOCLDSTOP|SA_RESTART;
	if (sigaction(SIGCHLD, &act, NULL) == -1) {
		perror("sigaction");
		exit(EXIT_FAILURE);
	}

	while (1) {
		scpi = readline ("> ");

		if (!scpi) break;
		if (strlen (scpi) == 0) {
			free (scpi); 
			continue;
		}

		add_history (scpi); 

		if (strncmp (scpi, "quit", 4) == 0) break;
		if (strncmp (scpi, "plot", 4) == 0) {
			do_plot (sc);
			continue;
		}
		if (strncmp (scpi, "databuf", 7) == 0) {
			do_get_buf (sc);
			continue;
		}
		if (strncmp (scpi, "screen", 6) == 0) {
			do_get_screen (sc);
			continue;
		}

		l = strlen (scpi); 
		//printf ("got buf(%d): ", l); 
		//printb (scpi, l+2); 
		if (strchr (scpi, '?')) {
			//printf ("Expecting reply\n");
			l = sendscpi(sc, scpi, buff, 1024*1024);
			//printf ("Got replylen = %d.\n", l); 
			buff[l] = 0; //zero-terminate
			printb (buff, l);
		} else {
			//printf ("No reply expected\n");
			l=sendscpi(sc,scpi,NULL,0);
		}
		free (scpi);
	}
	//Disable keylock, so the user doesn't have to press the 'force'-button
	l=sendscpi(sc, ":KEY:LOCK DISABLE",NULL,0); 

	//Free up and exit
	usb_release_interface(sc,0);
	usb_close(sc);
	return 0;
}
Commit	Line	Data
037166c1 MG	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.
610d5b65	9	*/
037166c1 MG	10
	11	#include <usb.h>
	12	#include <stdlib.h>
	13	#include <stdio.h>
	14	#include <string.h>
	15	#include <sys/stat.h>
a8982973 MG	16	#include <sys/types.h>
a8982973 MG	17	#include <sys/wait.h>
037166c1 MG	18	#include <fcntl.h>
037166c1 MG	19	#include <unistd.h>
a8982973 MG	20	#include <signal.h>
a8982973 MG	21	#include <time.h>
037166c1 MG	22
	23	#include <readline/readline.h>
	24	#include <readline/history.h>
	25
3df14711 MG	26	#include "png.h"
3df14711 MG	27
037166c1	28
037166c1 MG	29	//This routine locates a scope by VID/PID and returns an opened handle to it.
037166c1 MG	30	usb_dev_handle *find_scope() {
610d5b65 MG	31	struct usb_bus *bus;
	32	struct usb_device *dev=NULL;
	33	usb_find_busses();
	34	usb_find_devices();
	35	for (bus=usb_busses; bus; bus=bus->next) {
	36	for (dev=bus->devices; dev; dev=dev->next) {
	37	//fprintf(stderr,"Prod/dev: %04X:%04X\n",dev->descriptor.idVendor,dev->descriptor.idProduct);
	38	if (dev->descriptor.idVendor==0x400 && dev->descriptor.idProduct==0x5dc) {
	39	return usb_open(dev);
	40	}
	41	}
037166c1	42	}
610d5b65	43	return NULL;
037166c1 MG	44	}
	45
	46	//Helper-routine: Convert a little-endian 4-byte word to an int
	47	void int2chars(unsigned char *buff,unsigned int a) {
610d5b65 MG	48	buff[3]=(a>>24)&0xff;
	49	buff[2]=(a>>16)&0xff;
	50	buff[1]=(a>>8)&0xff;
	51	buff[0]=(a)&0xff;
037166c1 MG	52	}
	53
	54	//Helper-routine: Convert an int to little-endian 4-byte word
	55	unsigned int chars2int(unsigned char *buff) {
610d5b65 MG	56	unsigned int a;
	57	a=buff[3]<<24;
	58	a+=buff[2]<<16;
	59	a+=buff[1]<<8;
	60	a+=buff[0];
	61	return a;
037166c1 MG	62	}
	63
	64	#define MIN(a,b) (((a)<(b))?(a):(b))
	65
	66	inline char printable (char ch)
	67	{
610d5b65 MG	68	if (ch < ' ') return '.';
	69	if (ch > '~') return '.';
	70	return ch;
037166c1 MG	71	}
	72
	73	//Debugging: Print a buffers contents in hex
	74	void printb (unsigned char *pkt, int len)
	75	{
610d5b65 MG	76	int i, j;
	77
	78	for (i=0;i<len;i+= 16) {
	79	printf ("%04x: ", i);
	80	for (j=0;j < MIN(len-i, 16);j++) {
	81	printf (" %02x", pkt[i+j]);
	82	if (j == 7) printf (" ");
	83	}
	84	if (j < 7) printf (" ");
	85	for (;j<17;j++)
	86	printf (" ");
	87
	88	for (j=0;j < MIN(len-i, 16);j++) {
	89	printf ("%c", printable (pkt[i+j]));
	90	}
	91	printf ("\n");
	92	}
037166c1 MG	93	}
	94
	95	//Send a scpi-command to the scope. The response goes into the buffer
	96	//called resp, with a size of resplen. If resp==NULL, no response
	97	//is requested.
1c832d05	98	int sendscpi(usb_dev_handle dev, char cmd,
610d5b65 MG	99	unsigned char *resp, int resplen) {
	100	unsigned char *buff;
	101	int len,r,i;
	102	int cmdlen = strlen(cmd);
	103	static unsigned char seq=0;
	104
	105
	106	buff=malloc(0x40);
037166c1	107	seq++;
610d5b65	108	buff[0]=1; //func
037166c1	109	buff[1]=seq; buff[2]=~seq; //nseq
610d5b65 MG	110	buff[3]=0;
610d5b65 MG	111	int2chars(buff+4, cmdlen);
037166c1	112	buff[8]=1;
610d5b65 MG	113	buff[9]=0x37;
	114	buff[10]=0x39;
	115	buff[11]=0x39;
	116	//fprintf(stderr,"Writing header len=%d\n", cmdlen);
	117	//printb(buff,12);
1c832d05	118	r=usb_bulk_write(dev, 1, (char*)buff, 12, 1000);
610d5b65 MG	119	//fprintf(stderr,"%i bytes written. Writing cmd\n",r);
	120	//printb(cmd, cmdlen);
	121	r=usb_bulk_write(dev, 1, cmd, cmdlen, 1000);
	122	//fprintf(stderr,"%i bytes written.\n",r);
	123	if (resp != NULL && resplen != 0) {
	124	//send read command
	125	buff[0]=2; //func
	126	seq++;
	127	buff[1]=seq; buff[2]=~seq; //nseq
	128	int2chars(buff+4,0x40);
	129	buff[8]=1;
	130	buff[9]=0xA;
	131	buff[10]=0;
	132	buff[11]=0;
	133	//fprintf(stderr,"Writing resp req header\n");
	134	//printb(buff,12);
	135	r=usb_bulk_write(dev, 1, (char*)buff, 12, 1000);
	136	//fprintf(stderr,"%i bytes written. Reading response hdr\n",r);
	137	r=usb_bulk_read(dev, 2, (char*)buff, 0x40, 1000);
	138	//printb(buff,r);
	139	len=chars2int(buff+4);
	140	//fprintf(stderr,"%i bytes read. Resplen=%i\n",r,len);
	141	for (i=0; i<(r-12); i++) {
	142	if (i<resplen) resp[i] = buff[i+12];
	143	}
	144	//printb(resp,r-12);
	145	if (len > 0x40-12) {
	146	//fprintf(stderr," Reading response:\n");
	147	if (resplen<len) len=resplen;
	148	r=usb_bulk_read(dev, 2, (char*)resp+(0x40-12), len-(0x40-12),1000);
	149	//fprintf(stderr,"%i bytes read, wanted %i.\n", r, len-(0x40-12));
	150	return r+(0x40-12);
	151	}
	152	return len;
037166c1	153	}
610d5b65	154	return 0;
037166c1 MG	155	}
	156
	157	//Initialize the scope.
	158	void initscope(usb_dev_handle *dev) {
610d5b65 MG	159	int r;
	160	unsigned char buff[10];
	161	usb_claim_interface(dev,0);
	162	//The following code isn't really necessary, the program works
	163	//OK without it too.
	164	r=usb_control_msg(dev, 0xC8, 9, 0, 0, (char*)buff, 4, 1000);
	165	if (r < 0) {
	166	fprintf (stderr, "Error %d sending init message: %s\n",
	167	r, strerror (-r));
	168	fprintf (stderr, "Do you have permission on the USB device?\n");
	169	exit (1);
	170	}
	171	if (chars2int(buff)!=0x40004dc) {
	172	fprintf(stderr,"Init: buff[%i]=%x\n",r,chars2int(buff));
	173	}
	174	return;
037166c1 MG	175	}
	176
	177	#define HAVE_READLINE
	178	#ifndef HAVE_READLINE
	179
	180	char *readline (prompt)
	181	{
610d5b65 MG	182	char *buf;
	183
	184	printf (prompt);
	185	fflush (stdout);
	186	buf = malloc (1024);
	187
	188	if (fgets (buf, 1023, stdin) == NULL) {
	189	free (buf);
	190	return NULL;
	191	}
	192	l = strlen (buf);
	193	if (buf[l-1] == '\n') {
	194	buf[l] = 0;
	195	}
	196	return buf;
037166c1 MG	197	}
	198
	199	void add_history (char *buf)
	200	{
	201	}
	202	#endif
	203
	204
	205	void do_plot (struct usb_dev_handle *sc)
	206	{
610d5b65 MG	207	unsigned char ch1[1024], ch2[1024];
610d5b65 MG	208	int i, l;
037166c1	209
610d5b65 MG	210	static FILE *gnuplot=NULL;
610d5b65 MG	211	FILE *fp;
037166c1	212
610d5b65	213	l = sendscpi(sc, ":WAV:DATA? CHANEL1", ch1, 1024);
037166c1	214
610d5b65 MG	215	if (l != 1024) {
	216	printf ("hmm. didnt' get 1024 bytes. \n");
	217	}
037166c1	218
610d5b65	219	l = sendscpi(sc, ":WAV:DATA? CHANNEL2", ch2, 1024);
037166c1	220
610d5b65 MG	221	if (l != 1024) {
	222	printf ("hmm. didnt' get 1024 bytes. \n");
	223	}
037166c1	224
610d5b65 MG	225	if (!gnuplot) {
	226	gnuplot = popen ("gnuplot", "w");
	227	}
037166c1	228
610d5b65 MG	229	fp = fopen ("temp.dat", "w");
	230	for (i=0xd4;i<0x32c;i++)
	231	//for (i=0;i<0x400;i++)
	232	fprintf (fp, "%d %d\n", 255 - ch1[i], 255 - ch2[i]);
	233	fclose (fp);
037166c1	234
610d5b65 MG	235	fprintf (gnuplot, "plot 'temp.dat' using 1 with lines, 'temp.dat' using 2 with lines\n");
610d5b65 MG	236	fflush (gnuplot);
037166c1 MG	237	}
	238
	239
	240	#define ERROR -1e100
	241
	242	double get_float_from_scope (struct usb_dev_handle sc, char var)
	243	{
610d5b65 MG	244	unsigned char buf[1024];
	245	double temp;
	246	int l;
	247
	248	l = sendscpi(sc, var, buf, 1024);
	249	if (l > 0) {
	250	sscanf ((char*)buf, "%lf", &temp);
	251	return temp;
	252	}
	253	return ERROR;
037166c1 MG	254	}
	255
	256
	257	void do_get_buf (struct usb_dev_handle *sc)
	258	{
610d5b65 MG	259	FILE *fp;
	260	int i, j, l, bp;
	261	char buf[1024];
	262	unsigned char ch1[1024];
	263	unsigned char data[512*1024];
	264	double sampfreq;
037166c1	265
610d5b65	266	sendscpi (sc, ":STOP", NULL, 0);
037166c1	267
610d5b65	268	sampfreq = get_float_from_scope (sc, ":ACQ:SAMP?");
037166c1	269
610d5b65	270	printf ("Got sampling freq: %g\n", sampfreq);
037166c1	271
610d5b65 MG	272	sprintf (buf, ":TIM:SCAL %.15f", 50 / sampfreq);
	273	printf ("sending scale cmd: %s\n", buf);
	274	sendscpi (sc, buf, NULL, 0);
037166c1	275
610d5b65	276	sleep (1);
037166c1	277
610d5b65 MG	278	bp=0;
	279	for (i=-2541024;i< 2541024;i += 600) {
	280	sprintf (buf, ":TIM:OFFSET %.15f", i / sampfreq);
	281	printf ("Sending offset cmd: %s\n", buf);
	282	sendscpi (sc, buf, NULL, 0);
037166c1	283
610d5b65	284	l = sendscpi(sc, ":WAV:DATA? CHANEL1", ch1, 1024);
037166c1	285
610d5b65 MG	286	if (l != 1024) {
	287	printf ("hmm. didnt' get 1024 bytes. \n");
	288	}
037166c1	289
610d5b65 MG	290	for (j=0;j<600;j++)
	291	data[bp++] = ch1[j+0xd4];
	292	}
	293	printf ("Got %d bytes of data. \n", bp);
037166c1	294
610d5b65 MG	295	fp = fopen ("ch1.dump", "w");
	296	fwrite (data, bp, 1, fp);
	297	fclose (fp);
	298
	299	sendscpi (sc, ":TIM:OFFSET 0", NULL, 0);
037166c1 MG	300	}
037166c1 MG	301
a8982973 MG	302	void do_get_screen(struct usb_dev_handle *sc)
	303	{
	304	unsigned char screen[320*234];
a8982973 MG	305	time_t lt;
a8982973 MG	306	char filename[256];
3df14711	307	unsigned char *png;
e8e713c3	308	int imglen;
7ba4ad35	309	int ret;
a8982973	310	int l;
3df14711	311	int fd;
a8982973 MG	312	pid_t display;
	313
	314	/* Hide "RMT" from screen */
	315	l = sendscpi(sc, ":KEY:LOCK DISABLE", NULL, 0);
	316	usleep(20000);
	317
	318	l = sendscpi(sc, ":LCD:DATA?", screen, sizeof(screen));
	319
	320	if (l != sizeof(screen)) {
	321	printf ("hmm. didnt' get %d bytes, but %d\n\n", sizeof(screen), l);
	322	}
037166c1	323
7ba4ad35 MG	324	png = lcd2png(screen, &imglen);
	325
	326	lt = time(NULL);
e8e713c3 MG	327	strftime(filename, sizeof(filename), "screen_%Y%m%d-%H%M%S.png", localtime(&lt));
e8e713c3 MG	328	fd=open(filename, O_CREAT\|O_WRONLY, 0644);
7ba4ad35 MG	329	if (fd == -1) {
	330	perror("open");
	331	exit(EXIT_FAILURE);
	332	}
	333
	334	while(imglen > 0) {
	335	ret = write(fd, png, imglen);
	336	if (ret == -1) {
	337	perror("write");
	338	exit(EXIT_FAILURE);
	339	}
	340	imglen -= ret;
	341	}
e8e713c3	342	close(fd);
7ba4ad35	343	free(png);
a8982973 MG	344
	345	printf("Waveform saved as %s\n", filename);
	346
	347	display = fork();
	348	switch(display) {
	349	case 0:
	350	execlp("display", "display", filename, NULL);
	351	exit(0);
	352	break;
	353	case -1:
	354	perror("fork");
	355	break;
	356	default:
	357	break;
	358	}
	359	}
	360
	361	void child_reaper(int sig)
	362	{
	363	pid_t child;
	364
	365	do {
	366	child = waitpid(-1, NULL, WNOHANG);
	367	} while(child > 0);
	368
	369	}
037166c1 MG	370
	371	int main(int argc, char **argv)
	372	{
610d5b65 MG	373	struct usb_dev_handle *sc;
	374	char *scpi;
	375	unsigned char *buff;
	376	int l;
a8982973 MG	377	struct sigaction act;
a8982973 MG	378
610d5b65 MG	379	//Init libusb
	380	usb_init();
	381	//Locate and open the scope
	382	sc=find_scope();
	383	if (!sc) {
	384	printf("No scope found.\n");
	385	exit(1);
	386	} else {
	387	printf("Scope found.\n");
	388	}
	389	//Initialize scope
	390	initscope(sc);
	391	buff = malloc (1024*1024);
a8982973 MG	392	if (buff == NULL) {
	393	perror("malloc");
	394	exit(EXIT_FAILURE);
	395	}
	396
	397	bzero(&act, sizeof(act));
	398	act.sa_handler = child_reaper;
	399	act.sa_flags = SA_NOCLDSTOP\|SA_RESTART;
	400	if (sigaction(SIGCHLD, &act, NULL) == -1) {
	401	perror("sigaction");
	402	exit(EXIT_FAILURE);
	403	}
	404
610d5b65 MG	405	while (1) {
	406	scpi = readline ("> ");
	407
	408	if (!scpi) break;
	409	if (strlen (scpi) == 0) {
	410	free (scpi);
	411	continue;
	412	}
	413
	414	add_history (scpi);
	415
	416	if (strncmp (scpi, "quit", 4) == 0) break;
	417	if (strncmp (scpi, "plot", 4) == 0) {
	418	do_plot (sc);
	419	continue;
	420	}
a8982973	421	if (strncmp (scpi, "databuf", 7) == 0) {
610d5b65 MG	422	do_get_buf (sc);
	423	continue;
	424	}
a8982973 MG	425	if (strncmp (scpi, "screen", 6) == 0) {
	426	do_get_screen (sc);
	427	continue;
	428	}
610d5b65 MG	429
	430	l = strlen (scpi);
	431	//printf ("got buf(%d): ", l);
	432	//printb (scpi, l+2);
	433	if (strchr (scpi, '?')) {
	434	//printf ("Expecting reply\n");
	435	l = sendscpi(sc, scpi, buff, 1024*1024);
	436	//printf ("Got replylen = %d.\n", l);
	437	buff[l] = 0; //zero-terminate
	438	printb (buff, l);
	439	} else {
	440	//printf ("No reply expected\n");
	441	l=sendscpi(sc,scpi,NULL,0);
	442	}
	443	free (scpi);
	444	}
	445	//Disable keylock, so the user doesn't have to press the 'force'-button
	446	l=sendscpi(sc, ":KEY:LOCK DISABLE",NULL,0);
	447
	448	//Free up and exit
	449	usb_release_interface(sc,0);
	450	usb_close(sc);
	451	return 0;
037166c1	452	}