X-Git-Url: http://git.linex4red.de/pub/USBasp.git/blobdiff_plain/5de364163f5a7597ba2f54e37cdea493fbd1e7ff..05fcf7e2a79bebb978d4aeaef26b12f70c6826f8:/LUFA/Drivers/USB/LowLevel/Endpoint.c

diff --git a/LUFA/Drivers/USB/LowLevel/Endpoint.c b/LUFA/Drivers/USB/LowLevel/Endpoint.c
index 6d59510b8..2244996d4 100644
--- a/LUFA/Drivers/USB/LowLevel/Endpoint.c
+++ b/LUFA/Drivers/USB/LowLevel/Endpoint.c
@@ -207,6 +207,9 @@ uint8_t Endpoint_Discard_Stream(uint16_t Length
 	return ENDPOINT_RWSTREAM_NoError;
 }
 
+/* The following abuses the C preprocessor in order to copy-past common code with slight alterations,
+ * so that the code needs to be written once. It is a crude form of templating to reduce code maintenance. */
+
 #define  TEMPLATE_FUNC_NAME                        Endpoint_Write_Stream_LE
 #define  TEMPLATE_BUFFER_TYPE                      const void*
 #define  TEMPLATE_CLEAR_ENDPOINT()                 Endpoint_ClearIN()
@@ -231,21 +234,21 @@ uint8_t Endpoint_Discard_Stream(uint16_t Length
 #define  TEMPLATE_FUNC_NAME                        Endpoint_Write_Stream_BE
 #define  TEMPLATE_BUFFER_TYPE                      const void*
 #define  TEMPLATE_CLEAR_ENDPOINT()                 Endpoint_ClearIN()
-#define  TEMPLATE_BUFFER_OFFSET(Length)            Length - 1
+#define  TEMPLATE_BUFFER_OFFSET(Length)            (Length - 1)
 #define  TEMPLATE_TRANSFER_BYTE(BufferPtr)         Endpoint_Write_Byte(*((uint8_t*)BufferPtr--))
 #include "Template/Template_Endpoint_RW.c"
 
 #define  TEMPLATE_FUNC_NAME                        Endpoint_Write_EStream_BE
 #define  TEMPLATE_BUFFER_TYPE                      const void*
 #define  TEMPLATE_CLEAR_ENDPOINT()                 Endpoint_ClearIN()
-#define  TEMPLATE_BUFFER_OFFSET(Length)            Length - 1
+#define  TEMPLATE_BUFFER_OFFSET(Length)            (Length - 1)
 #define  TEMPLATE_TRANSFER_BYTE(BufferPtr)         Endpoint_Write_Byte(eeprom_read_byte((uint8_t*)BufferPtr--))
 #include "Template/Template_Endpoint_RW.c"
 
 #define  TEMPLATE_FUNC_NAME                        Endpoint_Write_PStream_BE
 #define  TEMPLATE_BUFFER_TYPE                      const void*
 #define  TEMPLATE_CLEAR_ENDPOINT()                 Endpoint_ClearIN()
-#define  TEMPLATE_BUFFER_OFFSET(Length)            Length - 1
+#define  TEMPLATE_BUFFER_OFFSET(Length)            (Length - 1)
 #define  TEMPLATE_TRANSFER_BYTE(BufferPtr)         Endpoint_Write_Byte(pgm_read_byte((uint8_t*)BufferPtr--))
 #include "Template/Template_Endpoint_RW.c"
 
@@ -266,14 +269,14 @@ uint8_t Endpoint_Discard_Stream(uint16_t Length
 #define  TEMPLATE_FUNC_NAME                        Endpoint_Read_Stream_BE
 #define  TEMPLATE_BUFFER_TYPE                      void*
 #define  TEMPLATE_CLEAR_ENDPOINT()                 Endpoint_ClearOUT()
-#define  TEMPLATE_BUFFER_OFFSET(Length)            Length - 1
+#define  TEMPLATE_BUFFER_OFFSET(Length)            (Length - 1)
 #define  TEMPLATE_TRANSFER_BYTE(BufferPtr)         *((uint8_t*)BufferPtr--) = Endpoint_Read_Byte()
 #include "Template/Template_Endpoint_RW.c"
 
 #define  TEMPLATE_FUNC_NAME                        Endpoint_Read_EStream_BE
 #define  TEMPLATE_BUFFER_TYPE                      void*
 #define  TEMPLATE_CLEAR_ENDPOINT()                 Endpoint_ClearOUT()
-#define  TEMPLATE_BUFFER_OFFSET(Length)            Length - 1
+#define  TEMPLATE_BUFFER_OFFSET(Length)            (Length - 1)
 #define  TEMPLATE_TRANSFER_BYTE(BufferPtr)         eeprom_write_byte((uint8_t*)BufferPtr--, Endpoint_Read_Byte())
 #include "Template/Template_Endpoint_RW.c"
 
@@ -295,17 +298,17 @@ uint8_t Endpoint_Discard_Stream(uint16_t Length
 #include "Template/Template_Endpoint_Control_W.c"
 
 #define  TEMPLATE_FUNC_NAME                        Endpoint_Write_Control_Stream_BE
-#define  TEMPLATE_BUFFER_OFFSET(Length)            Length - 1
+#define  TEMPLATE_BUFFER_OFFSET(Length)            (Length - 1)
 #define  TEMPLATE_TRANSFER_BYTE(BufferPtr)         Endpoint_Write_Byte(*((uint8_t*)BufferPtr--))
 #include "Template/Template_Endpoint_Control_W.c"
 
 #define  TEMPLATE_FUNC_NAME                        Endpoint_Write_Control_PStream_BE
-#define  TEMPLATE_BUFFER_OFFSET(Length)            Length - 1
+#define  TEMPLATE_BUFFER_OFFSET(Length)            (Length - 1)
 #define  TEMPLATE_TRANSFER_BYTE(BufferPtr)         Endpoint_Write_Byte(pgm_read_byte((uint8_t*)BufferPtr--))
 #include "Template/Template_Endpoint_Control_W.c"
 
 #define  TEMPLATE_FUNC_NAME                        Endpoint_Write_Control_EStream_BE
-#define  TEMPLATE_BUFFER_OFFSET(Length)            Length - 1
+#define  TEMPLATE_BUFFER_OFFSET(Length)            (Length - 1)
 #define  TEMPLATE_TRANSFER_BYTE(BufferPtr)         Endpoint_Write_Byte(eeprom_read_byte((uint8_t*)BufferPtr--))
 #include "Template/Template_Endpoint_Control_W.c"
 
@@ -320,12 +323,12 @@ uint8_t Endpoint_Discard_Stream(uint16_t Length
 #include "Template/Template_Endpoint_Control_R.c"
 
 #define  TEMPLATE_FUNC_NAME                        Endpoint_Read_Control_Stream_BE
-#define  TEMPLATE_BUFFER_OFFSET(Length)            Length - 1
+#define  TEMPLATE_BUFFER_OFFSET(Length)            (Length - 1)
 #define  TEMPLATE_TRANSFER_BYTE(BufferPtr)         *((uint8_t*)BufferPtr--) = Endpoint_Read_Byte()
 #include "Template/Template_Endpoint_Control_R.c"
 
 #define  TEMPLATE_FUNC_NAME                        Endpoint_Read_Control_EStream_BE
-#define  TEMPLATE_BUFFER_OFFSET(Length)            Length - 1
+#define  TEMPLATE_BUFFER_OFFSET(Length)            (Length - 1)
 #define  TEMPLATE_TRANSFER_BYTE(BufferPtr)         eeprom_write_byte((uint8_t*)BufferPtr--, Endpoint_Read_Byte())
 #include "Template/Template_Endpoint_Control_R.c"