From 668c3811b881a316288e8ab07b2d28ab4120662a Mon Sep 17 00:00:00 2001
From: me-no-dev <hristo@espressif.com>
Date: Thu, 15 Dec 2016 01:41:54 +0200
Subject: [PATCH] Wire: wait while bus is busy if ack failed

---
 cores/esp32/esp32-hal-i2c.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/cores/esp32/esp32-hal-i2c.c b/cores/esp32/esp32-hal-i2c.c
index a501f40e..fd42db5a 100644
--- a/cores/esp32/esp32-hal-i2c.c
+++ b/cores/esp32/esp32-hal-i2c.c
@@ -219,6 +219,7 @@ i2c_err_t i2cWrite(i2c_t * i2c, uint16_t address, bool addr_10bit, uint8_t * dat
             //Transmission did not finish and ACK_ERR is set
             if(i2c->dev->int_raw.ack_err) {
                 //log_w("Ack Error! Addr: %x", address >> 1);
+                while(i2c->dev->status_reg.bus_busy);
                 I2C_MUTEX_UNLOCK();
                 return I2C_ERROR_ACK;
             }