1. Hi,
2.
3. I bought the RS485 Cap and i'm trying to use it correctly.
4.
5. The connection is set to the UART 2 with the switch. ( rx and tx )
6.
7. i correctly set the pin mux to enable the uart 2:
8.
9. echo 21 > /sys/kernel/debug/omap_mux/spi0_sclk
10. echo 1 > /sys/kernel/debug/omap_mux/spi0_d0
11.
12.
13. In my code, i'm able to open the connection, but not to initiate it :
14.
15.
16. int fd = open ("/dev/ttyO2", O_RDWR);
17. if (fd < 0) {
18. printf("error\n");
19. /* Error handling. See errno. */
20. }
21. // it works
22. struct serial_rs485 rs485conf;
23. rs485conf.flags |= SER_RS485_ENABLED;
24. rs485conf.delay_rts_before_send = 0x00000004;
25. int test = ioctl(fd, TIOCSRS485, &rs485conf);
26. if(test<0){
27. test=0;
28. /// i'm stuck here .........
29. }else{
30. test=1;
31. }
32.
33.
34. Would you like to explain me what is wrong with me ?
I just discovered something new for me, I looked at the documentation of
the BeagleBone rs485 cap. And I discovered that I need to control GPIO1_4
and GPIO1_0. But I don't think it's the reason actually for my problem. No ?
35.
36. Thx you very much,
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