cpu/stm32f1: uncrustified spi driver

cpu/stm32f1/periph/spi.c

@@ -55,7 +55,7 @@ int spi_init_master(spi_t dev, spi_conf_t conf, spi_speed_t speed)
     uint16_t br_div;
     uint8_t bus_div;
 
-    switch(dev) {
+    switch (dev) {
 #if SPI_0_EN
         case SPI_0:
             spi = SPI_0_DEV;
@@ -87,7 +87,7 @@ int spi_init_master(spi_t dev, spi_conf_t conf, spi_speed_t speed)
     spi_conf_pins(dev);
 
     /* configure SPI bus speed */
-    switch(speed) {
+    switch (speed) {
         case SPI_SPEED_10MHZ:
             br_div = 0x01 + bus_div;      /* actual speed: 9MHz   */
             break;
@@ -130,7 +130,7 @@ int spi_conf_pins(spi_t dev)
 {
     gpio_t mosi, miso, clk;
 
-    switch(dev) {
+    switch (dev) {
 #if SPI_0_EN
         case SPI_0:
             clk = SPI_0_CLK_PIN;
@@ -188,7 +188,7 @@ int spi_transfer_byte(spi_t dev, char out, char *in)
     SPI_TypeDef *spi;
     int transferred = 0;
 
-    switch(dev) {
+    switch (dev) {
 #if SPI_0_EN
         case SPI_0:
             spi = SPI_0_DEV;
@@ -210,11 +210,11 @@ int spi_transfer_byte(spi_t dev, char out, char *in)
             return -1;
     }
 
-    while (!(spi->SR & SPI_SR_TXE));
+    while (!(spi->SR & SPI_SR_TXE)) ;
     spi->DR = out;
     transferred++;
 
-    while (!(spi->SR & SPI_SR_RXNE));
+    while (!(spi->SR & SPI_SR_RXNE)) ;
     if (in != NULL) {
         *in = spi->DR;
         transferred++;
@@ -224,7 +224,7 @@ int spi_transfer_byte(spi_t dev, char out, char *in)
     }
 
     /* SPI busy */
-    while ((spi->SR & 0x80));
+    while ((spi->SR & 0x80)) ;
 #if ENABLE_DEBUG
     if (in != NULL) {
         DEBUG("\nout: %x in: %x transferred: %x\n", out, *in, transferred);
@@ -246,7 +246,7 @@ void spi_transmission_begin(spi_t dev, char reset_val)
 
 void spi_poweron(spi_t dev)
 {
-    switch(dev) {
+    switch (dev) {
 #if SPI_0_EN
         case SPI_0:
             SPI_0_CLKEN();
@@ -272,7 +272,7 @@ void spi_poweron(spi_t dev)
 
 void spi_poweroff(spi_t dev)
 {
-    switch(dev) {
+    switch (dev) {
 #if SPI_0_EN
         case SPI_0:
             SPI_0_DEV->CR1 &= ~(SPI_CR1_SPE);   /* turn SPI peripheral off */