Use 16-bit length for TWI driver packet read/write requests for longer transfers.

LUFA/DoxygenPages/ChangeLog.txt

@@ -13,6 +13,9 @@
   *   - Added new PROGMEM variant send functions to the CDC class host driver
   *
   *  <b>Changed:</b>
+  *  - Core:
+  *   - The TWI peripheral driver's TWI_WritePacket() and TWI_ReadPacket() functions now takes a 16-bit Length rather than an 8-bit
+  *     length, for longer transfers
   *  - Library Applications:
   *   - The CDC, DFU, Mass Storage and Printer class bootloaders will no longer run the user application if the application reset
   *     vector is blank (thanks to Alex Kazik)

LUFA/Drivers/Peripheral/AVR8/TWI_AVR8.c

@@ -135,7 +135,7 @@ uint8_t TWI_ReadPacket(const uint8_t SlaveAddress,
                        const uint8_t* InternalAddress,
                        uint8_t InternalAddressLen,
                        uint8_t* Buffer,
-                       uint8_t Length)
+                       uint16_t Length)
 {
 	uint8_t ErrorCode;
 
@@ -175,7 +175,7 @@ uint8_t TWI_WritePacket(const uint8_t SlaveAddress,
                         const uint8_t* InternalAddress,
                         uint8_t InternalAddressLen,
                         const uint8_t* Buffer,
-                        uint8_t Length)
+                        uint16_t Length)
 {
 	uint8_t ErrorCode;
 

LUFA/Drivers/Peripheral/AVR8/TWI_AVR8.h

@@ -273,7 +273,7 @@
 			                       const uint8_t* InternalAddress,
 			                       uint8_t InternalAddressLen,
 			                       uint8_t* Buffer,
-			                       uint8_t Length) ATTR_NON_NULL_PTR_ARG(3);
+			                       uint16_t Length) ATTR_NON_NULL_PTR_ARG(3);
 
 			/** High level function to perform a complete packet transfer over the TWI bus from the specified
 			 *  device.
@@ -292,7 +292,7 @@
 			                        const uint8_t* InternalAddress,
 			                        uint8_t InternalAddressLen,
 			                        const uint8_t* Buffer,
-			                        uint8_t Length) ATTR_NON_NULL_PTR_ARG(3);
+			                        uint16_t Length) ATTR_NON_NULL_PTR_ARG(3);
 
 	/* Disable C linkage for C++ Compilers: */
 		#if defined(__cplusplus)

LUFA/Drivers/Peripheral/XMEGA/TWI_XMEGA.c

@@ -110,7 +110,7 @@ uint8_t TWI_ReadPacket(TWI_t* const TWI,
                        const uint8_t* InternalAddress,
                        uint8_t InternalAddressLen,
                        uint8_t* Buffer,
-                       uint8_t Length)
+                       uint16_t Length)
 {
 	uint8_t ErrorCode;
 
@@ -151,7 +151,7 @@ uint8_t TWI_WritePacket(TWI_t* const TWI,
                         const uint8_t* InternalAddress,
                         uint8_t InternalAddressLen,
                         const uint8_t* Buffer,
-                        uint8_t Length)
+                        uint16_t Length)
 {
 	uint8_t ErrorCode;
 

LUFA/Drivers/Peripheral/XMEGA/TWI_XMEGA.h

@@ -268,7 +268,7 @@
 			                       const uint8_t* InternalAddress,
 			                       uint8_t InternalAddressLen,
 			                       uint8_t* Buffer,
-			                       uint8_t Length) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(4);
+			                       uint16_t Length) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(4);
 
 			/** High level function to perform a complete packet transfer over the TWI bus from the specified
 			 *  device.
@@ -289,7 +289,7 @@
 			                        const uint8_t* InternalAddress,
 			                        uint8_t InternalAddressLen,
 			                        const uint8_t* Buffer,
-			                        uint8_t Length) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(4);
+			                        uint16_t Length) ATTR_NON_NULL_PTR_ARG(1) ATTR_NON_NULL_PTR_ARG(4);
 
 	/* Disable C linkage for C++ Compilers: */
 		#if defined(__cplusplus)