diff --git a/cpu/stm32f1/periph/spi.c b/cpu/stm32f1/periph/spi.c
index 0944099a8f..8956191689 100644
--- a/cpu/stm32f1/periph/spi.c
+++ b/cpu/stm32f1/periph/spi.c
@@ -15,11 +15,14 @@
  *
  * @author      Thomas Eichinger <thomas.eichinger@fu-berlin.de>
  * @author      Fabian Nack <nack@inf.fu-berlin.de>
+ * @author      Hauke Petersen <hauke.petersen@fu-berlin.de>
+ * @author      Joakim Gebart <joakim.gebart@eistec.se>
  *
  * @}
  */
 
 #include "stm32f10x.h"
+#include "mutex.h"
 #include "periph/gpio.h"
 #include "periph/spi.h"
 #include "periph_conf.h"
@@ -31,6 +34,21 @@
 /* guard file in case no SPI device is defined */
 #if SPI_0_EN
 
+/**
+ * @brief Array holding one pre-initialized mutex for each SPI device
+ */
+static mutex_t locks[] =  {
+#if SPI_0_EN
+    [SPI_0] = MUTEX_INIT,
+#endif
+#if SPI_1_EN
+    [SPI_1] = MUTEX_INIT,
+#endif
+#if SPI_2_EN
+    [SPI_2] = MUTEX_INIT
+#endif
+};
+
 int spi_init_master(spi_t dev, spi_conf_t conf, spi_speed_t speed)
 {
     SPI_TypeDef *spi;
@@ -125,6 +143,24 @@ int spi_conf_pins(spi_t dev)
     return 0;
 }
 
+int spi_acquire(spi_t dev)
+{
+    if (dev >= SPI_NUMOF) {
+        return -1;
+    }
+    mutex_lock(&locks[dev]);
+    return 0;
+}
+
+int spi_release(spi_t dev)
+{
+    if (dev >= SPI_NUMOF) {
+        return -1;
+    }
+    mutex_unlock(&locks[dev]);
+    return 0;
+}
+
 int spi_transfer_byte(spi_t dev, char out, char *in)
 {
     SPI_TypeDef *spi;