added support for EEPROM-Emulation / RAM-buffered Flash

improvements in RP2040 plattform

src/knx/platform.h

@@ -6,6 +6,7 @@
 
 #ifndef KNX_FLASH_SIZE
 #define KNX_FLASH_SIZE 1024
+#pragma warning "KNX_FLASH_SIZE not defined, using 1024"
 #endif
 
 enum NvMemoryType

src/rp2040_arduino_platform.cpp

@@ -10,10 +10,13 @@ by Earl E. Philhower III https://github.com/earlephilhower/arduino-pico V1.11.0
 RTTI must be set to enabled in the board options
 
 Uses direct flash reading/writing.
-Size ist defined by KNX_FLASH_SIZE (default 4k).
-Offset in Flash is defined by KNX_FLASH_OFFSET (default 1,5MiB / 0x180000).
+Size ist defined by KNX_FLASH_SIZE (default 4k) - must be a multiple of 4096.
+Offset in Flash is defined by KNX_FLASH_OFFSET (default 1,5MiB / 0x180000) - must be a multiple of 4096.
+
 EEPROM Emulation from arduino-pico core (max 4k) can be use by defining USE_RP2040_EEPROM_EMULATION
 
+A RAM-buffered Flash can be use by defining USE_RP2040_LARGE_EEPROM_EMULATION
+
 
 ----------------------------------------------------*/
 
@@ -30,6 +33,16 @@ EEPROM Emulation from arduino-pico core (max 4k) can be use by defining USE_RP20
 #include <hardware/watchdog.h>  // from Pico SDK
 #include <hardware/flash.h>     // from Pico SDK
 
+#define FLASHPTR ((uint8_t*)XIP_BASE + KNX_FLASH_OFFSET)
+
+#if KNX_FLASH_SIZE%4096
+#error "KNX_FLASH_SIZE must be multiple of 4096"
+#endif
+
+#if KNX_FLASH_SIZE%4096
+#error "KNX_FLASH_OFFSET must be multiple of 4096"
+#endif
+
 
 RP2040ArduinoPlatform::RP2040ArduinoPlatform()
 #ifndef KNX_NO_DEFAULT_UART
@@ -82,6 +95,43 @@ void RP2040ArduinoPlatform::restart()
 
 #pragma warning "Using EEPROM Simulation"
 
+#ifdef USE_RP2040_LARGE_EEPROM_EMULATION
+
+uint8_t * RP2040ArduinoPlatform::getEepromBuffer(uint16_t size)
+{
+    if(size%4096)
+    {
+        println("KNX_FLASH_SIZE must be a multiple of 4096");
+        fatalError();
+    }
+    
+    if(!_rambuff_initialized)
+    {
+        memcpy(_rambuff, FLASHPTR, KNX_FLASH_SIZE);
+        _rambuff_initialized = true;
+    }
+    
+    return _rambuff;
+}
+
+void RP2040ArduinoPlatform::commitToEeprom()
+{
+    noInterrupts();
+    rp2040.idleOtherCore();
+
+    //ToDo: write block-by-block to prevent writing of untouched blocks
+    if(memcmp(_rambuff, FLASHPTR, KNX_FLASH_SIZE))
+    {
+        flash_range_erase (KNX_FLASH_OFFSET, KNX_FLASH_SIZE);
+        flash_range_program(KNX_FLASH_OFFSET, _rambuff, KNX_FLASH_SIZE);
+    }
+
+    rp2040.resumeOtherCore();
+    interrupts();
+}
+
+#else
+
 uint8_t * RP2040ArduinoPlatform::getEepromBuffer(uint16_t size)
 {
     if(size > 4096)
@@ -106,6 +156,8 @@ void RP2040ArduinoPlatform::commitToEeprom()
     EEPROM.commit();
 }
 
+#endif
+
 #else
 
 size_t RP2040ArduinoPlatform::flashEraseBlockSize()

src/rp2040_arduino_platform.h

@@ -6,10 +6,11 @@
 
 #ifndef KNX_FLASH_OFFSET
 #define KNX_FLASH_OFFSET 0x180000   // 1.5MiB
+#pragma warning "KNX_FLASH_OFFSET not defined, using 0x180000"
 #endif
 
-#ifndef KNX_FLASH_SIZE
-#define KNX_FLASH_SIZE 1024
+#ifdef USE_RP2040_LARGE_EEPROM_EMULATION
+#define USE_RP2040_EEPROM_EMULATION
 #endif
 
 
@@ -29,6 +30,11 @@ public:
     #ifdef USE_RP2040_EEPROM_EMULATION
     uint8_t* getEepromBuffer(uint16_t size);
     void commitToEeprom();
+
+    #ifdef USE_RP2040_LARGE_EEPROM_EMULATION
+    uint8_t _rambuff[KNX_FLASH_SIZE];
+    bool _rambuff_initialized = false;
+    #endif
     #else
 
     // size of one EraseBlock in pages