From 35ade68bb3256fe2b3d1b25582e335593d30ffd0 Mon Sep 17 00:00:00 2001
From: jflyper <shinoda@jaist.ac.jp>
Date: Mon, 21 Jan 2019 01:02:10 +0900
Subject: [PATCH] Discard excess/bogus data in DR

---
 src/main/drivers/bus_spi_stdperiph.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/main/drivers/bus_spi_stdperiph.c b/src/main/drivers/bus_spi_stdperiph.c
index 5795c86f81..08ed3e3a22 100644
--- a/src/main/drivers/bus_spi_stdperiph.c
+++ b/src/main/drivers/bus_spi_stdperiph.c
@@ -113,6 +113,8 @@ uint8_t spiTransferByte(SPI_TypeDef *instance, uint8_t txByte)
 {
     uint16_t spiTimeout = 1000;
 
+    instance->DR;
+
     while (SPI_I2S_GetFlagStatus(instance, SPI_I2S_FLAG_TXE) == RESET)
         if ((spiTimeout--) == 0)
             return spiTimeoutUserCallback(instance);