Disabled SEL interrupt functionality so we can receive IP packets without delays. Some updates for receiving messages. Appears that the HD functionality still works, but others are untested

src/raspberrypi/.vscode/launch.json

@@ -8,13 +8,14 @@
             "name": "(gdb) Launch",
             "type": "cppdbg",
             "request": "launch",
-            "program": "${workspaceFolder}/bin/rascsi",
+            "program": "${workspaceFolder}/bin/fullspec/rascsi",
             "args": [],
             "stopAtEntry": true,
             "cwd": "${workspaceFolder}",
             "environment": [],
             "externalConsole": false,
             "MIMode": "gdb",
+            "miDebuggerPath": "${workspaceFolder}/launch_sudo.sh",
             "setupCommands": [
                 {
                     "description": "Enable pretty-printing for gdb",

src/raspberrypi/controllers/scsidev_ctrl.cpp

@@ -147,7 +147,7 @@ BUS::phase_t FASTCALL SCSIDEV::Process()
 
 //---------------------------------------------------------------------------
 //
-//	Phaes
+//	Phases
 //
 //---------------------------------------------------------------------------
 
@@ -2083,3 +2083,32 @@ BOOL FASTCALL SCSIDEV::XferMsg(DWORD msg)
 
 	return TRUE;
 }
+
+//---------------------------------------------------------------------------
+//
+//	Transfer IP packet to the host via SCSI
+//
+//---------------------------------------------------------------------------
+BOOL FASTCALL SCSIDEV::TransferPacketToHost(int packet_len){
+
+	// Aquire the bus
+
+	// Reselection
+
+	// Message OUT (expect a "NO OPERATION")
+	//    IF we get a DISCONNECT message, abort sending the message
+	//        Transition to MESSAGE IN and send a DISCONNECT
+	//        then go to BUS FREE
+
+	// DATA IN
+	//   ... send the packet
+
+	// MESSAGE OUT (expect a "NO OPERATION")
+
+	// If more packets, go back to DATA IN
+
+	// Else
+	// MESSAGE IN (sends DISCONNECT)
+
+	// BUS FREE
+}

src/raspberrypi/controllers/scsidev_ctrl.h

@@ -102,6 +102,8 @@ public:
 	BOOL FASTCALL IsSCSI() const {return TRUE;}
 										// SCSI check
 
+	BOOL FASTCALL TransferPacketToHost(int packet_len);
+
 private:
 	// Phase
 	void FASTCALL BusFree();

src/raspberrypi/devices/ctapdriver.cpp

@@ -5,6 +5,7 @@
 //
 //	Powered by XM6 TypeG Technology.
 //	Copyright (C) 2016-2020 GIMONS
+//  Copyright akuker
 //
 //	Imported NetBSD support and some optimisation patch by Rin Okuyama.
 //

src/raspberrypi/devices/scsi_nuvolink.cpp

@@ -460,22 +460,27 @@ void FASTCALL SCSINuvolink::SetMacAddr(BYTE *mac)
 //	Receive Packet
 //
 //---------------------------------------------------------------------------
-void FASTCALL SCSINuvolink::ReceivePacket()
+int FASTCALL SCSINuvolink::ReceivePacket()
 {
 	static const BYTE bcast_addr[6] = { 0xff, 0xff, 0xff, 0xff, 0xff, 0xff };
 
 	ASSERT(this);
 	ASSERT(tap);
-	LOGTRACE("SCSINuvolink::ReceivePacket");
+	//LOGTRACE("SCSINuvolink::ReceivePacket");
 
-	// previous packet has not been received
-	if (packet_enable) {
-		return;
-	}
+	// // previous packet has not been received
+	// if (packet_enable) {
+	// 	LOGDEBUG("packet not enabled");
+	// 	return;
+	// }
 
 	// Receive packet
 	packet_len = tap->Rx(packet_buf);
 
+	if(packet_len){
+		LOGINFO("Received a packet of size %d",packet_len);
+	}
+
 	// Check if received packet
 	if (memcmp(packet_buf, mac_addr, 6) != 0) {
 		if (memcmp(packet_buf, bcast_addr, 6) != 0) {
@@ -486,16 +491,23 @@ void FASTCALL SCSINuvolink::ReceivePacket()
 
 	// Discard if it exceeds the buffer size
 	if (packet_len > 2048) {
+		LOGDEBUG("Packet size was too big. Dropping it");
 		packet_len = 0;
 		return;
 	}
 
-	// Store in receive buffer
-	if (packet_len > 0) {
-		packet_enable = TRUE;
-	}
+	// TransferPacket(packet_len, packet_buff);
+	return packet_len;
+
+	// // Store in receive buffer
+	// if (packet_len > 0) {
+	// 	packet_enable = TRUE;
+	// }
 }
 
+
+
+
 //---------------------------------------------------------------------------
 //
 //	Get Packet

src/raspberrypi/devices/scsi_nuvolink.h

@@ -44,16 +44,18 @@ public:
 										// Destructor
 
 	// commands
-	int FASTCALL Inquiry(const DWORD *cdb, BYTE *buf, DWORD major, DWORD minor);
+	int FASTCALL Inquiry(const DWORD *cdb, BYTE *buffer, DWORD major, DWORD minor);
 										// INQUIRY command
 	BOOL FASTCALL TestUnitReady(const DWORD *cdb);
 										// TEST UNIT READY command
-	int FASTCALL GetMessage6(const DWORD *cdb, BYTE *buf);
+	int FASTCALL GetMessage6(const DWORD *cdb, BYTE *buffer);
 										// GET MESSAGE10 command
-	BOOL FASTCALL SendMessage6(const DWORD *cdb, BYTE *buf);
+	BOOL FASTCALL SendMessage6(const DWORD *cdb, BYTE *buffer);
 										// SEND MESSAGE10 command
-	BOOL SendPacket(BYTE *buf, int len);
+	BOOL SendPacket(BYTE *buffer, int len);
 										// Send a packet
+	int FASTCALL ReceivePacket();
+										// Receive a packet
 
 
 private:
@@ -77,17 +79,16 @@ private:
 	static const char* m_revision;
 
 #if defined(RASCSI) && !defined(BAREMETAL)
-	int FASTCALL GetMacAddr(BYTE *buf);
+	int FASTCALL GetMacAddr(BYTE *buffer);
 										// Get MAC address
-	void FASTCALL SetMacAddr(BYTE *buf);
+	void FASTCALL SetMacAddr(BYTE *buffer);
 										// Set MAC address
-	void FASTCALL ReceivePacket();
-										// Receive a packet
-	void FASTCALL GetPacketBuf(BYTE *buf);
+	void FASTCALL GetPacketBuf(BYTE *buffer);
 										// Get a packet
-	void FASTCALL SetMulticastRegisters(BYTE *buf, int len);
+	void FASTCALL SetMulticastRegisters(BYTE *buffer, int len);
 										// Change the multicast registers
-
+	void FASTCALL TransferPacketToHost(BYTE *buffer, int len);
+										// Transfer the received packet to the host
 	CTapDriver *tap;
 										// TAP driver
 	BOOL m_bTapEnable;

src/raspberrypi/launch_sudo.sh

@@ -0,0 +1,3 @@
+# This is used for debugging. VisualStudio code will call this file when launching 
+# the debugger, instead of directly calling GDB. That way we can add the pkexec
+sudo /usr/bin/gdb "$@"

src/raspberrypi/rascsi.cpp

@@ -1136,6 +1136,31 @@ LOGCRITICAL("LOGCRITICAL");
 		actid = -1;
 		phase = BUS::busfree;
 
+		// If any of the controllers are an Ethernet
+		// device, check to see if there is new data
+		// received.
+		for (int x = 0; x < CtrlMax; x++) {
+			if (!ctrl[x]){
+				continue;
+			}
+
+			for (int y = 0; y < UnitNum; y++) {
+				int unitno = x * UnitNum + y;
+				// branch by unit type
+				if (disk[unitno]) {
+					if (disk[unitno]->GetID() == MAKEID('S','C','N','L')) {
+						// Receive the data....
+						int packet_len = ((SCSINuvolink*)disk[unitno])->ReceivePacket();
+						if(packet_len > 0){
+							((SCSIDEV*)ctrl[x])->TransferPacketToHost(packet_len);
+						}
+
+					}
+				}
+			}
+
+		}
+
 #ifdef USE_SEL_EVENT_ENABLE
 		// SEL signal polling
 		if (bus->PollSelectEvent() < 0) {

src/raspberrypi/xm6.h

@@ -39,7 +39,9 @@
 //	Various Operation Settings
 //
 //---------------------------------------------------------------------------
-#define USE_SEL_EVENT_ENABLE			// Check SEL signal by event
+// For now, USE_SEL_EVENT_ENABLE is incompatible with the Nuvolink functionality.
+//   See https://github.com/akuker/RASCSI/issues/27 for more information
+//#define USE_SEL_EVENT_ENABLE			// Check SEL signal by event
 #define REMOVE_FIXED_SASIHD_SIZE		// remove the size limitation of SASIHD
 #define USE_MZ1F23_1024_SUPPORT			// MZ-1F23 (SASI 20M/sector size 1024)