WIP: use RPC lib as transport

Author: facchinm

libraries/ThreadDebug/src/ThreadDebug.cpp

@@ -697,9 +697,11 @@ void Platform_CommSendChar(int character)
 static const char g_memoryMapXml[] = "<?xml version=\"1.0\"?>"
                                      "<!DOCTYPE memory-map PUBLIC \"+//IDN gnu.org//DTD GDB Memory Map V1.0//EN\" \"http://sourceware.org/gdb/gdb-memory-map.dtd\">"
                                      "<memory-map>"
+#ifndef CORE_CM4
                                      "<memory type=\"ram\" start=\"0x00000000\" length=\"0x10000\"> </memory>"
-                                     "<memory type=\"flash\" start=\"0x08000000\" length=\"0x200000\"> <property name=\"blocksize\">0x20000</property></memory>"
                                      "<memory type=\"ram\" start=\"0x10000000\" length=\"0x48000\"> </memory>"
+#endif
+                                     "<memory type=\"flash\" start=\"0x08000000\" length=\"0x200000\"> <property name=\"blocksize\">0x20000</property></memory>"
                                      "<memory type=\"ram\" start=\"0x1ff00000\" length=\"0x20000\"> </memory>"
                                      "<memory type=\"ram\" start=\"0x20000000\" length=\"0x20000\"> </memory>"
                                      "<memory type=\"ram\" start=\"0x24000000\" length=\"0x80000\"> </memory>"
@@ -712,7 +714,9 @@ static const char g_memoryMapXml[] = "<?xml version=\"1.0\"?>"
                                      "<memory type=\"ram\" start=\"0x58026000\" length=\"0x800\"> </memory>"
                                      "<memory type=\"ram\" start=\"0x58027000\" length=\"0x400\"> </memory>"
                                      "<memory type=\"flash\" start=\"0x90000000\" length=\"0x10000000\"> <property name=\"blocksize\">0x200</property></memory>"
+#ifndef CORE_CM4
                                      "<memory type=\"ram\" start=\"0xc0000000\" length=\"0x800000\"> </memory>"
+#endif
                                      "</memory-map>";
 #endif
 
@@ -1145,8 +1149,7 @@ void UartDebugCommInterface::onReceivedData()
     }
 }
 
-
-
+#ifdef SERIAL_CDC
 UsbDebugCommInterface::UsbDebugCommInterface(arduino::USBSerial* pSerial) :
     _pSerial(pSerial)
 {
@@ -1181,3 +1184,43 @@ void UsbDebugCommInterface::attach(void (*pCallback)())
 {
     _pSerial->attach(pCallback);
 }
+#endif
+
+#if defined(STM32H747xx) && defined(CORE_CM4)
+
+RPCDebugCommInterface::RPCDebugCommInterface(arduino::RPC* pSerial) :
+    _pSerial(pSerial)
+{
+    _pSerial->begin();
+}
+
+RPCDebugCommInterface::~RPCDebugCommInterface()
+{
+}
+
+bool RPCDebugCommInterface::readable()
+{
+    return _pSerial->available() > 0;
+}
+
+bool RPCDebugCommInterface::writeable()
+{
+    // The USBSerial::write() method blocks until data is actually sent to the PC.
+    return true;
+}
+
+uint8_t RPCDebugCommInterface::read()
+{
+    return _pSerial->read();
+}
+
+void RPCDebugCommInterface::write(uint8_t c)
+{
+    _pSerial->write(c);
+}
+
+void RPCDebugCommInterface::attach(void (*pCallback)())
+{
+    _pSerial->attach(pCallback);
+}
+#endif

libraries/ThreadDebug/src/ThreadDebug.h

@@ -34,6 +34,10 @@
 #include <Arduino.h>
 //#include <mbed.h>
 
+#if defined(STM32H747xx) && defined(CORE_CM4)
+// include RPC out of arduino namespace
+#include "RPC_internal.h"
+#endif
 
 namespace arduino {
 
@@ -76,6 +80,7 @@ class DebugCommInterface {
     virtual void attach(void (*pCallback)()) = 0;
 };
 
+#ifdef SERIAL_CDC
 // Use the SerialUSB interface to communicate with GDB.
 class UsbDebugCommInterface : public DebugCommInterface {
 public:
@@ -91,6 +96,25 @@ class UsbDebugCommInterface : public DebugCommInterface {
 protected:
     arduino::USBSerial*  _pSerial;
 };
+#endif
+
+#if defined(STM32H747xx) && defined(CORE_CM4)
+// Use the RPC interface to communicate with GDB from M4 core
+class RPCDebugCommInterface : public DebugCommInterface {
+public:
+    RPCDebugCommInterface(arduino::RPC*);
+    virtual ~RPCDebugCommInterface();
+
+    virtual bool readable();
+    virtual bool writeable();
+    virtual uint8_t read();
+    virtual void write(uint8_t c);
+    virtual void attach(void (*pCallback)());
+
+protected:
+    arduino::RPC*  _pSerial;
+};
+#endif
 
 // Use one of the device's hardware UARTs to communicate with GDB.
 class UartDebugCommInterface : public DebugCommInterface {