Ender 3 V2 BL24CXX EEPROM support

Marlin/src/HAL/STM32F1/eeprom_bl24cxx.cpp

@@ -0,0 +1,81 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+/**
+ * PersistentStore for Arduino-style EEPROM interface
+ * with simple implementations supplied by Marlin.
+ */
+
+#include "../../inc/MarlinConfig.h"
+
+#if ENABLED(IIC_BL24CXX_EEPROM)
+
+#include "../shared/eeprom_if.h"
+#include "../shared/eeprom_api.h"
+
+//
+// PersistentStore
+//
+
+#ifndef MARLIN_EEPROM_SIZE
+  #error "MARLIN_EEPROM_SIZE is required for IIC_BL24CXX_EEPROM."
+#endif
+
+size_t PersistentStore::capacity()    { return MARLIN_EEPROM_SIZE; }
+
+bool PersistentStore::access_start()  { eeprom_init(); return true; }
+bool PersistentStore::access_finish() { return true; }
+
+bool PersistentStore::write_data(int &pos, const uint8_t *value, size_t size, uint16_t *crc) {
+  while (size--) {
+    uint8_t v = *value;
+    uint8_t * const p = (uint8_t * const)pos;
+    // EEPROM has only ~100,000 write cycles,
+    // so only write bytes that have changed!
+    if (v != eeprom_read_byte(p)) {
+      eeprom_write_byte(p, v);
+      delay(2);
+      if (eeprom_read_byte(p) != v) {
+        SERIAL_ECHO_MSG(STR_ERR_EEPROM_WRITE);
+        return true;
+      }
+    }
+    crc16(crc, &v, 1);
+    pos++;
+    value++;
+  }
+  return false;
+}
+
+bool PersistentStore::read_data(int &pos, uint8_t* value, size_t size, uint16_t *crc, const bool writing/*=true*/) {
+  do {
+    uint8_t * const p = (uint8_t * const)pos;
+    uint8_t c = eeprom_read_byte(p);
+    if (writing) *value = c;
+    crc16(crc, &c, 1);
+    pos++;
+    value++;
+  } while (--size);
+  return false;
+}
+
+#endif // IIC_BL24CXX_EEPROM

Marlin/src/HAL/STM32F1/eeprom_if_iic.cpp

@@ -0,0 +1,51 @@
+/**
+ * Marlin 3D Printer Firmware
+ * Copyright (c) 2020 MarlinFirmware [https://github.com/MarlinFirmware/Marlin]
+ *
+ * Based on Sprinter and grbl.
+ * Copyright (c) 2011 Camiel Gubbels / Erik van der Zalm
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ *
+ */
+
+/**
+ * Platform-independent Arduino functions for I2C EEPROM.
+ * Enable USE_SHARED_EEPROM if not supplied by the framework.
+ */
+
+#include "../../inc/MarlinConfig.h"
+
+#if ENABLED(IIC_BL24CXX_EEPROM)
+
+#include "../../libs/BL24CXX.h"
+#include "../shared/eeprom_if.h"
+
+void eeprom_init() { BL24CXX::init(); }
+
+// ------------------------
+// Public functions
+// ------------------------
+
+void eeprom_write_byte(uint8_t *pos, unsigned char value) {
+  const unsigned eeprom_address = (unsigned)pos;
+  return BL24CXX::writeOneByte(eeprom_address, value);
+}
+
+uint8_t eeprom_read_byte(uint8_t *pos) {
+  const unsigned eeprom_address = (unsigned)pos;
+  return BL24CXX::readOneByte(eeprom_address);
+}
+
+#endif // IIC_BL24CXX_EEPROM

Marlin/src/HAL/shared/eeprom_api.h

@@ -29,20 +29,38 @@
 
 class PersistentStore {
 public:
+
+  // Total available persistent storage space (in bytes)
+  static size_t capacity();
+
+  // Prepare to read or write
   static bool access_start();
+
+  // Housecleaning after read or write
   static bool access_finish();
+
+  // Write one or more bytes of data and update the CRC
+  // Return 'true' on write error
   static bool write_data(int &pos, const uint8_t *value, size_t size, uint16_t *crc);
+
+  // Read one or more bytes of data and update the CRC
+  // Return 'true' on read error
   static bool read_data(int &pos, uint8_t* value, size_t size, uint16_t *crc, const bool writing=true);
-  static size_t capacity();
 
+  // Write one or more bytes of data
+  // Return 'true' on write error
   static inline bool write_data(const int pos, const uint8_t* value, const size_t size=sizeof(uint8_t)) {
     int data_pos = pos;
     uint16_t crc = 0;
     return write_data(data_pos, value, size, &crc);
   }
 
+  // Write a single byte of data
+  // Return 'true' on write error
   static inline bool write_data(const int pos, const uint8_t value) { return write_data(pos, &value); }
 
+  // Read one or more bytes of data
+  // Return 'true' on read error
   static inline bool read_data(const int pos, uint8_t* value, const size_t size=1) {
     int data_pos = pos;
     uint16_t crc = 0;

Marlin/src/MarlinCore.cpp

@@ -72,7 +72,7 @@
 #endif
 
 #if ENABLED(IIC_BL24CXX_EEPROM)
-  #include "lcd/dwin/eeprom_BL24CXX.h"
+  #include "libs/BL24CXX.h"
 #endif
 
 #if ENABLED(DIRECT_STEPPING)
@@ -1171,7 +1171,7 @@ void setup() {
   #if ENABLED(IIC_BL24CXX_EEPROM)
     BL24CXX::init();
     const uint8_t err = BL24CXX::check();
-    SERIAL_ECHO_TERNARY(err, "I2C_EEPROM Check ", "failed", "succeeded", "!\n");
+    SERIAL_ECHO_TERNARY(err, "BL24CXX Check ", "failed", "succeeded", "!\n");
   #endif
 
   #if ENABLED(DWIN_CREALITY_LCD)

Marlin/src/gcode/eeprom/M500-M504.cpp

@@ -58,11 +58,47 @@ void GcodeSuite::M502() {
 #endif // !DISABLE_M503
 
 #if ENABLED(EEPROM_SETTINGS)
+
+  #if ENABLED(MARLIN_DEV_MODE)
+    #include "../../libs/hex_print_routines.h"
+  #endif
+
   /**
    * M504: Validate EEPROM Contents
    */
   void GcodeSuite::M504() {
+    #if ENABLED(MARLIN_DEV_MODE)
+      const bool dowrite = parser.seenval('W');
+      if (dowrite || parser.seenval('R')) {
+        uint8_t val = 0;
+        int addr = parser.value_ushort();
+        if (dowrite) {
+          val = parser.byteval('V');
+          persistentStore.write_data(addr, &val);
+          SERIAL_ECHOLNPAIR("Wrote address ", addr, " with ", int(val));
+        }
+        else {
+          if (parser.seenval('T')) {
+            const int endaddr = parser.value_ushort();
+            while (addr <= endaddr) {
+              persistentStore.read_data(addr, &val);
+              SERIAL_ECHOLNPAIR("0x", hex_word(addr), ":", hex_byte(val));
+              addr++;
+              safe_delay(10);
+            }
+            SERIAL_EOL();
+          }
+          else {
+            persistentStore.read_data(addr, &val);
+            SERIAL_ECHOLNPAIR("Read address ", addr, " and got ", int(val));
+          }
+        }
+        return;
+      }
+    #endif
+
     if (settings.validate())
       SERIAL_ECHO_MSG("EEPROM OK");
   }
+
 #endif

Marlin/src/inc/Conditionals_post.h

@@ -50,6 +50,8 @@
     #define USE_EMULATED_EEPROM 1
   #elif ANY(I2C_EEPROM, SPI_EEPROM)
     #define USE_WIRED_EEPROM    1
+  #elif ENABLED(IIC_BL24CXX_EEPROM)
+    // nothing
   #else
     #define USE_FALLBACK_EEPROM 1
   #endif
@@ -60,6 +62,7 @@
   #undef SDCARD_EEPROM_EMULATION
   #undef SRAM_EEPROM_EMULATION
   #undef FLASH_EEPROM_EMULATION
+  #undef IIC_BL24CXX_EEPROM
 #endif
 
 #ifdef TEENSYDUINO

Marlin/src/inc/SanityCheck.h

@@ -2131,8 +2131,13 @@ static_assert(hbm[Z_AXIS] >= 0, "HOMING_BUMP_MM.Z must be greater than or equal
  */
 #if ENABLED(EEPROM_SETTINGS)
   #if 1 < 0 \
-    + ENABLED(I2C_EEPROM) + ENABLED(SPI_EEPROM) + ENABLED(QSPI_EEPROM) \
-    + ENABLED(SDCARD_EEPROM_EMULATION) + ENABLED(FLASH_EEPROM_EMULATION) + ENABLED(SRAM_EEPROM_EMULATION)
+    + ENABLED(I2C_EEPROM) \
+    + ENABLED(SPI_EEPROM) \
+    + ENABLED(QSPI_EEPROM) \
+    + ENABLED(SDCARD_EEPROM_EMULATION) \
+    + ENABLED(FLASH_EEPROM_EMULATION) \
+    + ENABLED(SRAM_EEPROM_EMULATION) \
+    + ENABLED(IIC_BL24CXX_EEPROM)
     #error "Please select only one method of EEPROM Persistent Storage."
   #endif
 #endif

Marlin/src/lcd/dwin/dwin.cpp

@@ -185,10 +185,11 @@ int temphot = 0, tempbed = 0;
 float zprobe_zoffset = 0;
 float last_zoffset = 0, last_probe_zoffset = 0;
 
-#define FONT_EEPROM_OFFSET 0
+#define DWIN_LANGUAGE_EEPROM_ADDRESS 0x01   // Between 0x01 and 0x63 (EEPROM_OFFSET-1)
+                                            // BL24CXX::check() uses 0x00
 
 void lcd_select_language(void) {
-  BL24CXX::read(FONT_EEPROM_OFFSET, (uint8_t*)&HMI_flag.language_flag, sizeof(HMI_flag.language_flag));
+  BL24CXX::read(DWIN_LANGUAGE_EEPROM_ADDRESS, (uint8_t*)&HMI_flag.language_flag, sizeof(HMI_flag.language_flag));
   if (HMI_flag.language_flag)
     DWIN_JPG_CacheTo1(Language_Chinese);
   else
@@ -198,12 +199,12 @@ void lcd_select_language(void) {
 void set_english_to_eeprom(void) {
   HMI_flag.language_flag = 0;
   DWIN_JPG_CacheTo1(Language_English);
-  BL24CXX::write(FONT_EEPROM_OFFSET, (uint8_t*)&HMI_flag.language_flag, sizeof(HMI_flag.language_flag));
+  BL24CXX::write(DWIN_LANGUAGE_EEPROM_ADDRESS, (uint8_t*)&HMI_flag.language_flag, sizeof(HMI_flag.language_flag));
 }
 void set_chinese_to_eeprom(void) {
   HMI_flag.language_flag = 1;
   DWIN_JPG_CacheTo1(Language_Chinese);
-  BL24CXX::write(FONT_EEPROM_OFFSET, (uint8_t*)&HMI_flag.language_flag, sizeof(HMI_flag.language_flag));
+  BL24CXX::write(DWIN_LANGUAGE_EEPROM_ADDRESS, (uint8_t*)&HMI_flag.language_flag, sizeof(HMI_flag.language_flag));
 }
 
 void show_plus_or_minus(uint8_t size, uint16_t bColor, uint8_t iNum, uint8_t fNum, uint16_t x, uint16_t y, long value) {

Marlin/src/lcd/dwin/dwin.h

@@ -27,7 +27,7 @@
 
 #include "dwin_lcd.h"
 #include "rotary_encoder.h"
-#include "eeprom_BL24CXX.h"
+#include "../../libs/BL24CXX.h"
 
 #include <stdint.h>