Ensure TPI enable timing requirements are met in AVRISP-MKII programmer. Remove invalid code in the TPI read/write functions.

LUFA/ManPages/FutureChanges.txt

@@ -33,7 +33,6 @@
   *      -# Finish MIDI class Bootloader
   *      -# Finish SideShow demo
   *      -# Finish StandaloneProgrammer project
-  *      -# Finish Webserver project
   *  - Ports
   *      -# AVR32 UC3B series microcontrollers
   *      -# Atmel ARM7 series microcontrollers

Projects/AVRISP-MKII/Lib/XPROG/XPROGProtocol.c

@@ -270,14 +270,14 @@ static void XPROGProtocol_WriteMemory(void)
 	Endpoint_ClearOUT();
 	Endpoint_SetEndpointDirection(ENDPOINT_DIR_IN);
 
+	if (XPROG_SelectedProtocol == XPRG_PROTOCOL_PDI)
+	{
 		/* Assume FLASH page programming by default, as it is the common case */
 		uint8_t WriteCommand     = XMEGA_NVM_CMD_WRITEFLASHPAGE;
 		uint8_t WriteBuffCommand = XMEGA_NVM_CMD_LOADFLASHPAGEBUFF;
 		uint8_t EraseBuffCommand = XMEGA_NVM_CMD_ERASEFLASHPAGEBUFF;
 		bool    PagedMemory      = true;
 
-	if (XPROG_SelectedProtocol == XPRG_PROTOCOL_PDI)
-	{
 		if (WriteMemory_XPROG_Params.MemoryType == XPRG_MEM_TYPE_APPL)
 		{
 			WriteCommand     = XMEGA_NVM_CMD_WRITEAPPSECPAGE;
@@ -321,8 +321,6 @@ static void XPROGProtocol_WriteMemory(void)
 	}
 	else
 	{
-		Serial_TxByte((uint8_t)WriteMemory_XPROG_Params.Length);
-	
 		/* Send write command to the TPI device, indicate timeout if occurred */
 		if (!(TINYNVM_WriteMemory(WriteMemory_XPROG_Params.Address, WriteMemory_XPROG_Params.ProgData,
 		      WriteMemory_XPROG_Params.Length)))
@@ -368,8 +366,6 @@ static void XPROGProtocol_ReadMemory(void)
 	}
 	else
 	{
-		Serial_TxByte((uint8_t)ReadMemory_XPROG_Params.Length);
-
 		/* Read the TPI target's memory, indicate timeout if occurred */
 		if (!(TINYNVM_ReadMemory(ReadMemory_XPROG_Params.Address, ReadBuffer, ReadMemory_XPROG_Params.Length)))
 		  ReturnStatus = XPRG_ERR_TIMEOUT;

Projects/AVRISP-MKII/Lib/XPROG/XPROGTarget.c

@@ -71,7 +71,7 @@ ISR(TIMER1_COMPA_vect, ISR_BLOCK)
 		  return;
 	
 		/* Shift in the bit one less than the frame size in position, so that the start bit will eventually
-		 * be discarded leaving the data to be byte-aligned for quick access */
+		 * be discarded leaving the data to be byte-aligned for quick access (subtract 9 as we are ORing to the MSB) */
 		if (BITBANG_PDIDATA_PIN & BITBANG_PDIDATA_MASK)
 		  ((uint8_t*)&SoftUSART_Data)[1] |= (1 << (BITS_IN_USART_FRAME - 9));
 
@@ -117,7 +117,7 @@ ISR(TIMER1_COMPB_vect, ISR_BLOCK)
 		  return;
 	
 		/* Shift in the bit one less than the frame size in position, so that the start bit will eventually
-		 * be discarded leaving the data to be byte-aligned for quick access */
+		 * be discarded leaving the data to be byte-aligned for quick access (subtract 9 as we are ORing to the MSB) */
 		if (BITBANG_TPIDATA_PIN & BITBANG_TPIDATA_MASK)
 		 ((uint8_t*)&SoftUSART_Data)[1] |= (1 << (BITS_IN_USART_FRAME - 9));
 
@@ -154,8 +154,7 @@ void XPROGTarget_EnableTargetPDI(void)
 	
 	/* Set DATA line high for at least 90ns to disable /RESET functionality */
 	PORTD |= (1 << 3);
-	asm volatile ("NOP"::);
+	_delay_ms(1);
-	asm volatile ("NOP"::);
 	
 	/* Set up the synchronous USART for XMEGA communications - 
 	   8 data bits, even parity, 2 stop bits */
@@ -169,8 +168,7 @@ void XPROGTarget_EnableTargetPDI(void)
 	
 	/* Set DATA line high for at least 90ns to disable /RESET functionality */
 	BITBANG_PDIDATA_PORT |= BITBANG_PDIDATA_MASK;
-	asm volatile ("NOP"::);
+	_delay_ms(1);
-	asm volatile ("NOP"::);
 
 	/* Fire timer compare channel A ISR to manage the software USART */
 	OCR1A   = BITS_BETWEEN_USART_CLOCKS;
@@ -188,11 +186,10 @@ void XPROGTarget_EnableTargetTPI(void)
 {
 	IsSending = false;
 
-	/* Set /RESET line low for at least 90ns to enable TPI functionality */
+	/* Set /RESET line low for at least 400ns to enable TPI functionality */
 	AUX_LINE_DDR  |=  AUX_LINE_MASK;
 	AUX_LINE_PORT &= ~AUX_LINE_MASK;
-	asm volatile ("NOP"::);
+	_delay_ms(1);
-	asm volatile ("NOP"::);
 
 #if defined(XPROG_VIA_HARDWARE_USART)
 	/* Set Tx and XCK as outputs, Rx as input */