diff --git a/src/ch341a.h b/src/ch341a.h
index 1d9b04bc..1aad2774 100644
--- a/src/ch341a.h
+++ b/src/ch341a.h
@@ -18,7 +18,6 @@
  * along with this program. If not, see <http://www.gnu.org/licenses/>.
  */
 
-
 #ifndef ch341a_h
 #define ch341a_h
 
@@ -32,34 +31,31 @@
 
 #define CH341A_USB_TIMEOUT      15000
 
-#define CH341A_CMD_SPI_STREAM    0xA8 // SPI command
-#define CH341A_CMD_UIO_STREAM    0xAB // UIO command
+#define CH341A_CMD_SPI_STREAM    0xA8   // SPI command
+#define CH341A_CMD_UIO_STREAM    0xAB   // UIO command
 
-#define CH341A_CMD_UIO_STM_IN    0x00 // UIO Interface In (D0~D7)
-#define CH341A_CMD_UIO_STM_DIR   0x40 // UIO interface Dir (set dir of D0~D5)
-#define CH341A_CMD_UIO_STM_OUT   0x80 // UIO Interface Output (D0~D5)
-#define CH341A_CMD_UIO_STM_END   0x20 // UIO Interface End Command
+#define CH341A_CMD_UIO_STM_IN    0x00   // UIO Interface In (D0~D7)
+#define CH341A_CMD_UIO_STM_DIR   0x40   // UIO interface Dir (set dir of D0~D5)
+#define CH341A_CMD_UIO_STM_OUT   0x80   // UIO Interface Output (D0~D5)
+#define CH341A_CMD_UIO_STM_END   0x20   // UIO Interface End Command
 
 #define  CH341A_CMD_I2C_STREAM   0xAA
-#define  CH341A_CMD_I2C_STM_SET  0x60 // Bit 2: SPI with two data pairs D5,D4=out, D7,D6=in
+#define  CH341A_CMD_I2C_STM_SET  0x60   // Bit 2: SPI with two data pairs (D5, D4)=out, (D7, D6)=in
 #define  CH341A_CMD_I2C_STM_END  0x00
 
-
 // USB error identifiers
 #define USB_ERROR_NOTFOUND    1
 #define USB_ERROR_ACCESS      2
 #define USB_ERROR_IO          3
 
-
 #ifdef __cplusplus
 extern "C" {
 #endif
 
-extern const char ch341a_desc[];
-void ch341a_initpgm (PROGRAMMER * pgm);
+  extern const char ch341a_desc[];
+  void ch341a_initpgm(PROGRAMMER *pgm);
 
 #ifdef __cplusplus
 }
 #endif
-
-#endif // ch341a_h
+#endif                          // ch341a_h