Hi KurtE,
Yes your assumptions are close.
I have listed more info below.
Any insights appreciated,
Thank you
Excerpts of C code on Edison:
static const char *PORT_NAME = "/dev/ttyMFD2";
serial_port = open(PORT_NAME, O_RDWR | O_NONBLOCK );
if (serial_port != -1)
{
printf("Serial Port open\n");
tcgetattr(serial_port,&options_original);
tcgetattr(serial_port, &options);
cfsetispeed(&options, B115200);
cfsetospeed(&options, B115200);
options.c_cflag |= ( CLOCAL | CREAD );
options.c_lflag |= ICANON;
tcsetattr(serial_port, TCSANOW, &options);
}
...
...
main() {
.....
int chars_read;
while (1) {
chars_read = read(serial_port, read_buffer, max_chars_to_read);
| if (chars_read > 0) | { | |||||
| for(int i=0;i<chars_read;i++) { | ||||||
| printf("%c",read_buffer[i]); | ||||||
| } | ||||||
| printf("\n"); | ||||||
| } |
} // while
} // main
When I connect the Edison J16 to PC via micro B to USB A cable, and run puTTy, I can see what I type on puTTy printed out, indicating
the Edison is reading and printing chars.
Then on microcontroler MK20DX256, it is similar C code. This C code is doing : println("Hello World..\n"); which I can see on puTTy.
-------
The command lsusb did not show any USB attached to J16: Maybe this is main issue, no USB or serial link detected on J16
lsusb
unable to initialize libusb: -99
---------dmesg output:
dmesg | tail -20
[ 36.983467] link down if wlan0 may call cfg80211_disconnected. event : 6, reason=15 from 00:14
:bf:39:71:1b
[ 36.988928] CFG80211-ERROR) wl_is_linkdown : Link down Reason : WLC_E_LINK
[ 36.993093] cfg80211: Calling CRDA to update world regulatory domain
[ 41.459945] CFG80211-ERROR) wl_cfg80211_connect : Connectting with00:14:bf:39:71:1b channel (6
) ssid "hkclients", len (9)
[ 41.459945]
[ 41.538052] wl_bss_connect_done succeeded with 00:14:bf:39:71:1b
[ 41.638302] wl_bss_connect_done succeeded with 00:14:bf:39:71:1b
[ 45.612291] CFG80211-ERROR) wl_is_linkdown : Link down Reason : WLC_E_DEAUTH_IND
[ 45.612332] link down if wlan0 may call cfg80211_disconnected. event : 6, reason=15 from 00:14
:bf:39:71:1b
[ 45.616244] CFG80211-ERROR) wl_is_linkdown : Link down Reason : WLC_E_LINK
[ 45.619456] cfg80211: Calling CRDA to update world regulatory domain
[ 50.108241] CFG80211-ERROR) wl_cfg80211_connect : Connectting with00:14:bf:39:71:1b channel (6
) ssid "hkclients", len (9)
[ 50.108241]
[ 50.197275] wl_bss_connect_done succeeded with 00:14:bf:39:71:1b
[ 50.222885] wl_bss_connect_done succeeded with 00:14:bf:39:71:1b
[ 51.611228] ip (280) used greatest stack depth: 5216 bytes left
[ 89.377248] EXT4-fs (mmcblk0p10): mounted filesystem with ordered data mode. Opts: discard,bar
rier=1,data=ordered,noauto_da_alloc
