From 9a2b701a75ca37fbbbfee93e2c145548eb31e292 Mon Sep 17 00:00:00 2001
From: Paul Thompson <paul.thompson@uetechnologies.com>
Date: Sat, 10 Mar 2018 11:31:13 -0800
Subject: [PATCH] STM32 : correct compilation warnings

---
 targets/TARGET_STM/stm_spi_api.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/targets/TARGET_STM/stm_spi_api.c b/targets/TARGET_STM/stm_spi_api.c
index e93b23ff8d..73d632c45c 100644
--- a/targets/TARGET_STM/stm_spi_api.c
+++ b/targets/TARGET_STM/stm_spi_api.c
@@ -67,6 +67,10 @@
 /* Consider 10ms as the default timeout for sending/receving 1 byte */
 #define TIMEOUT_1_BYTE 10
 
+#if defined(SPI_FLAG_FRLVL) // STM32F0 STM32F3 STM32F7 STM32L4
+extern HAL_StatusTypeDef HAL_SPIEx_FlushRxFifo(SPI_HandleTypeDef *hspi);
+#endif
+
 void init_spi(spi_t *obj)
 {
     struct spi_s *spiobj = SPI_S(obj);