From cecf2033885448f63a6d27cc96be3127eab0eee4 Mon Sep 17 00:00:00 2001
From: Jiacheng Guo <gjc@google.com>
Date: Wed, 18 Mar 2020 01:06:30 +0800
Subject: [PATCH] [nrf528xx] add volatile mark to nrf uart read/write buffers
 (#4652)

These buffers are touched in volatile and should be marked as volatile.
---
 examples/platforms/nrf528xx/src/transport/uart.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/examples/platforms/nrf528xx/src/transport/uart.c b/examples/platforms/nrf528xx/src/transport/uart.c
index 2a24bc118..640ab86d4 100644
--- a/examples/platforms/nrf528xx/src/transport/uart.c
+++ b/examples/platforms/nrf528xx/src/transport/uart.c
@@ -56,16 +56,16 @@ bool sUartEnabled = false;
 /**
  *  UART TX buffer variables.
  */
-static const uint8_t *sTransmitBuffer = NULL;
-static uint16_t       sTransmitLength = 0;
-static bool           sTransmitDone   = 0;
+static volatile const uint8_t *sTransmitBuffer = NULL;
+static volatile uint16_t       sTransmitLength = 0;
+static volatile bool           sTransmitDone   = 0;
 
 /**
  *  UART RX ring buffer variables.
  */
-static uint8_t  sReceiveBuffer[UART_RX_BUFFER_SIZE];
-static uint16_t sReceiveHead = 0;
-static uint16_t sReceiveTail = 0;
+static uint8_t           sReceiveBuffer[UART_RX_BUFFER_SIZE];
+static volatile uint16_t sReceiveHead = 0;
+static volatile uint16_t sReceiveTail = 0;
 
 /**
  * Function for checking if RX buffer is full.