From 04b552f28b91284dcab81fcf672ff4d96fe838cf Mon Sep 17 00:00:00 2001
From: mtei <2170248+mtei@users.noreply.github.com>
Date: Thu, 19 Jul 2018 04:51:49 +0900
Subject: [PATCH] add serial_low() at ISR() top

---
 keyboards/helix/serial.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/keyboards/helix/serial.c b/keyboards/helix/serial.c
index 588cf583b3..0bda051366 100644
--- a/keyboards/helix/serial.c
+++ b/keyboards/helix/serial.c
@@ -128,7 +128,7 @@ void serial_slave_init(void) {
 // Used by the sender to synchronize timing with the reciver.
 static
 void sync_recv(void) {
-  for (int i = 0; i < SERIAL_DELAY*5 && serial_read_pin(); i++ ) {
+  for (uint8_t i = 0; i < SERIAL_DELAY*5 && serial_read_pin(); i++ ) {
   }
   // This shouldn't hang if the slave disconnects because the
   // serial line will float to high if the slave does disconnect.
@@ -219,6 +219,7 @@ void change_reciver2sender(void) {
 
 // interrupt handle to be used by the slave device
 ISR(SERIAL_PIN_INTERRUPT) {
+  serial_low();
   serial_output();
 
   // slave send phase