From aa3ef774d063244c0fa295849b9f0ba63c6126ef Mon Sep 17 00:00:00 2001
From: Oleg Hahm <oleg@hobbykeller.org>
Date: Thu, 3 Dec 2015 17:41:21 +0100
Subject: [PATCH] cpu stm32f1 periph spi: simplify condition

---
 boards/spark-core/system_stm32f1.c | 2 +-
 cpu/stm32f1/periph/spi.c           | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/boards/spark-core/system_stm32f1.c b/boards/spark-core/system_stm32f1.c
index c6e081e0dc..3efb60b82f 100644
--- a/boards/spark-core/system_stm32f1.c
+++ b/boards/spark-core/system_stm32f1.c
@@ -41,7 +41,7 @@ static void set_system_clock(void)
     }
     while ((HSE_status == 0) && (startup_counter != HSE_STARTUP_TIMEOUT));
 
-    if ((RCC->CR & RCC_CR_HSERDY) != RESET) {
+    if (!(RCC->CR & RCC_CR_HSERDY)) {
         HSE_status = (uint32_t)0x01;
     }
     else {
diff --git a/cpu/stm32f1/periph/spi.c b/cpu/stm32f1/periph/spi.c
index f33d24e4c3..e410099c30 100644
--- a/cpu/stm32f1/periph/spi.c
+++ b/cpu/stm32f1/periph/spi.c
@@ -207,11 +207,11 @@ int spi_transfer_byte(spi_t dev, char out, char *in)
             return -1;
     }
 
-    while ((spi->SR & SPI_SR_TXE) == RESET);
+    while (!(spi->SR & SPI_SR_TXE));
     spi->DR = out;
     transferred++;
 
-    while ((spi->SR & SPI_SR_RXNE) == RESET);
+    while (!(spi->SR & SPI_SR_RXNE));
     if (in != NULL) {
         *in = spi->DR;
         transferred++;