Hello,
I take your example serial_read.c and i just want to show data by a printf
function.
But, i have a problem with libftdi. That is to say, i receive data but when
i look all bytes as 00!
Obviousely, it is wrong, the packet size is 38, but not
000000000000000000000000000...
I use an USB modem 802.15.4 (DIGI xstick).
Have you an idea for my problem?
Please, i search from 2 weeks about this bug..., may you help me?
Best regards.
M. DORIGNY Robert
Montigny le bretonneux
France
> root@D2Plug:/travail # gcc serial_read2.c -lftdi
> root@D2Plug:/travail # ./a.out
> read 1 bytes
> 00
> 00
> read 38 bytes
> 0000000000000000000000000000000000000000000000000000000000000000000000000000
> 0000000000000000000000000000000000000000000000000000000000000000000000000000
> read 38 bytes
> 0000000000000000000000000000000000000000000000000000000000000000000000000000
> 0000000000000000000000000000000000000000000000000000000000000000000000000000
> read 38 bytes
> 0000000000000000000000000000000000000000000000000000000000000000000000000000
> 0000000000000000000000000000000000000000000000000000000000000000000000000000
> read 38 bytes
> 0000000000000000000000000000000000000000000000000000000000000000000000000000
> 0000000000000000000000000000000000000000000000000000000000000000000000000000
>
/* serial_read.c
Read data via serial I/O
This program is distributed under the GPL, version 2
> */
#include <stdio.h>
> #include <unistd.h>
> #include <getopt.h>
> #include <ftdi.h>
int main(int argc, char **argv)
> {
> struct ftdi_context ftdic;
> char buf[128];
> int f, i , j;
> int vid = 0x0403;
> int pid = 0x6001;
> int baudrate = 115200;
> int interface = INTERFACE_ANY;
while ((i = getopt(argc, argv, "i:v:p:b:")) != -1)
> {
> switch (i)
> {
> case 'i': // 0=ANY, 1=A, 2=B, 3=C, 4=D
> interface = strtoul(optarg, NULL, 0);
> break;
> case 'v':
> vid = strtoul(optarg, NULL, 0);
> break;
> case 'p':
> pid = strtoul(optarg, NULL, 0);
> break;
> case 'b':
> baudrate = strtoul(optarg, NULL, 0);
> break;
> default:
> fprintf(stderr, "usage: %s [-i interface] [-v vid] [-p pid] [-b
> baudrate]\n", *argv);
> exit(-1);
> }
> }
// Init
> if (ftdi_init(&ftdic) < 0)
> {
> fprintf(stderr, "ftdi_init failed\n");
> return EXIT_FAILURE;
> }
// Select first interface
> ftdi_set_interface(&ftdic, interface);
// Open device
> f = ftdi_usb_open(&ftdic, vid, pid);
> if (f < 0)
> {
> fprintf(stderr, "unable to open ftdi device: %d (%s)\n", f,
> ftdi_get_error_string(&ftdic));
> exit(-1);
> }
// Set baudrate
> f = ftdi_set_baudrate(&ftdic, 115200);
> if (f < 0)
> {
> fprintf(stderr, "unable to set baudrate: %d (%s)\n", f,
> ftdi_get_error_string(&ftdic));
> exit(-1);
> }
>
> char * adr;
>
> // Read data forever
> while ((f = ftdi_read_data(&ftdic, buf, sizeof(buf))) >= 0) {
> if (f!=0)
> {
> fprintf(stderr, "read %d bytes\n", f);
> //printf("%s",buf);
> for (j=0;j<f;j++)
> printf("%02x",buf[j]);
> printf("\n");
>
> adr=&buf[0];
> for (j=0;j<f;j++)
> {
> printf("%02x",*adr);
> adr++;
> }
> printf("\n");
>
> fwrite(buf, f, 1, stdout);
> fflush(stderr);
> fflush(stdout);
> }
> }
ftdi_usb_close(&ftdic);
> ftdi_deinit(&ftdic);
> }
>
--
libftdi - see http://www.intra2net.com/en/developer/libftdi for details.
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