From 78e001e6dff498e457315136450c4d96eb9d7c5b Mon Sep 17 00:00:00 2001
From: odaki <odaki@mars.dti.ne.jp>
Date: Sat, 25 Apr 2020 22:21:59 +0900
Subject: [PATCH] Fix unintended 0 data when I2S restart

---
 Grbl_Esp32/i2s_ioexpander.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Grbl_Esp32/i2s_ioexpander.cpp b/Grbl_Esp32/i2s_ioexpander.cpp
index c674e2b8..693c0c24 100644
--- a/Grbl_Esp32/i2s_ioexpander.cpp
+++ b/Grbl_Esp32/i2s_ioexpander.cpp
@@ -244,6 +244,8 @@ static int i2s_start() {
   I2S0.conf.rx_reset = 1;
   I2S0.conf.rx_reset = 0;
 
+  I2S0.conf1.tx_stop_en = 1; // Prevent unintentional 0's at the start of I2S
+
   I2S0.out_link.addr = (uint32_t)dma.desc[0];
 
   // Connect DMA to FIFO
@@ -253,6 +255,8 @@ static int i2s_start() {
   I2S0.out_link.start = 1;
   I2S0.conf.tx_start = 1;
 
+  I2S0.conf1.tx_stop_en = 0; // BCK, WS start to work
+
   I2S_EXIT_CRITICAL();
  
   return 0;