ryancb4 opened a new issue #898:
URL: https://github.com/apache/incubator-nuttx-apps/issues/898
Writing from a single character array in the USB serial example in a single
thread causes the bytes to write out of order. Ex, define the string as:
```
static const char total_string[] = {0xAA, 0x01, 0x02, 0x03, 0x04, 0x05,
0x06, 0x07, 0x08,
0x09, 0x10, 0x11, 0x12, 0x13, 0x14,
0x15, 0x16, 0x17,
0x18, 0x19, 0x88, 0x89};
```
Then call the write for a single byte, the next nineteen bytes, and then the
last two bytes:
```
write(outfd, out_string, 1);
write(outfd, out_string[1], 19);
write(outfd, out_string[20], 2);
```
The output across the USB channel using
`cat /dev/ttyACM0 | hexdump -e '22/1 "%02X ""\n"" "'`
will be similar to:
```
AA 1F 04 20 EF 00 00 00 35 00 00 00 31 00 00 00 4D 75 01 02 5F 03
*
AA 01 02 5F 03 AA 00 00 35 00 00 00 31 00 00 00 4D 75 01 02 5F 03
AA 00 31 00 00 00 4D 75 01 02 5F 03 AA 02 5F 03 AA 1F 04 20 EF 00
00 00 35 00 00 00 31 00 00 00 4D 75 01 02 5F 03 AA 1F 04 20 EF 00
*
00 00 35 00 00 00 31 00 00 00 4D 75 01 02 5F 03 AA 00 00 31 00 00
00 4D 75 01 02 5F 03 AA 1F 04 20 EF 00 00 00 35 00 00 00 31 00 00
*
00 4D 75 01 02 5F 03 AA 4D 75 01 02 5F 03 AA 00 00 4D 75 01 02 5F
03 AA 01 02 5F 03 AA 1F 04 20 EF 00 00 00 35 00 00 00 31 00 00 00
4D 75 01 02 5F 03 AA 1F 04 20 EF 00 00 00 35 00 00 00 31 00 00 00
*
4D 75 01 02 5F 03 AA 35 00 00 00 31 00 00 00 4D 75 01 02 5F 03 AA
1F 04 20 EF 00 00 00 35 00 00 00 31 00 00 00 4D 75 01 02 5F 03 AA
75 01 02 5F 03 AA 1F 04 20 EF 00 00 00 35 00 00 00 31 00 00 00 4D
*
```
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