helix serial.c: add some comment

6 years ago · d63fb6f716
parent 8517f8a660
commit d63fb6f716
1 changed files with 5 additions and 0 deletions
--- a/keyboards/helix/serial.c
+++ b/keyboards/helix/serial.c
@ -1,5 +1,10 @@
 /*
 * WARNING: be careful changing this code, it is very timing dependent
 *
 * 2018-10-28 checked
 *  avr-gcc 4.9.2
 *  avr-gcc 5.4.0
 *  avr-gcc 7.3.0
 */
 #ifndef F_CPU