diff --git a/User_Code/module/periph/ws2812/ws2812.c b/User_Code/module/periph/ws2812/ws2812.c
index 4bb6299..a04b4c9 100644
--- a/User_Code/module/periph/ws2812/ws2812.c
+++ b/User_Code/module/periph/ws2812/ws2812.c
@@ -25,10 +25,12 @@
  * @param  [in] g                My Param doc
  * @param  [in] b                My Param doc
  */
-void WS2812_Ctrl(uint8_t r, uint8_t g, uint8_t b) {
+void WS2812_Ctrl(uint8_t r, uint8_t g, uint8_t b)
+{
     uint8_t txbuf[24];
     uint8_t res = 0;
-    for (int i = 0; i < 8; i++) {
+    for (auto i = 0; i < 8; i++)
+    {
         txbuf[7 - i] = (((g >> i) & 0x01) ? WS2812_HighLevel : WS2812_LowLevel) >> 1;
         txbuf[15 - i] = (((r >> i) & 0x01) ? WS2812_HighLevel : WS2812_LowLevel) >> 1;
         txbuf[23 - i] = (((b >> i) & 0x01) ? WS2812_HighLevel : WS2812_LowLevel) >> 1;
@@ -36,7 +38,8 @@ void WS2812_Ctrl(uint8_t r, uint8_t g, uint8_t b) {
     HAL_SPI_Transmit(&WS2812_SPI_UNIT, &res, 0, 0xFFFF);
     while (WS2812_SPI_UNIT.State != HAL_SPI_STATE_READY);
     HAL_SPI_Transmit(&WS2812_SPI_UNIT, txbuf, 24, 0xFFFF);
-    for (int i = 0; i < 100; i++) {
+    for (auto i = 0; i < 100; i++)
+    {
         HAL_SPI_Transmit(&WS2812_SPI_UNIT, &res, 1, 0xFFFF);
     }
 }