LPC176x SPI / I2C PersistentStore (#17651)

Marlin/src/HAL/LPC1768/eeprom_wired.cpp

@@ -0,0 +1,86 @@
+/**
+ * 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 <http://www.gnu.org/licenses/>.
+ *
+ */
+
+/**
+ * I2C/SPI EEPROM interface for LPC1768
+ */
+
+#ifdef TARGET_LPC1768
+
+#include "../../inc/MarlinConfig.h"
+
+#if USE_WIRED_EEPROM
+
+#include "../shared/eeprom_api.h"
+#include <Wire.h>
+
+#ifndef EEPROM_SIZE
+  #define EEPROM_SIZE           0x8000 // 32kB‬
+#endif
+
+bool PersistentStore::access_start() {
+  TERN_(SPI_EEPROM, 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;
+
+    // EEPROM has only ~100,000 write cycles,
+    // so only write bytes that have changed!
+    uint8_t * const p = (uint8_t * const)pos;
+    if (v != eeprom_read_byte(p)) {
+      eeprom_write_byte(p, v);
+      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 {
+    // Read from external EEPROM
+    const uint8_t c = eeprom_read_byte((uint8_t*)pos);
+
+    if (writing) *value = c;
+    crc16(crc, &c, 1);
+    pos++;
+    value++;
+  } while (--size);
+  return false;
+}
+
+size_t PersistentStore::capacity() { return EEPROM_SIZE; }
+
+#endif // USE_WIRED_EEPROM
+#endif // TARGET_LPC1768