From e8701195e66f2d27ffe17fb514eae8173795aaf7 Mon Sep 17 00:00:00 2001
From: Georgiy Bondarenko <69736697+nehilo@users.noreply.github.com>
Date: Thu, 4 Mar 2021 22:54:23 +0500
Subject: Initial commit

---
 Marlin/src/HAL/shared/eeprom_if_i2c.cpp | 89 +++++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 Marlin/src/HAL/shared/eeprom_if_i2c.cpp

(limited to 'Marlin/src/HAL/shared/eeprom_if_i2c.cpp')

diff --git a/Marlin/src/HAL/shared/eeprom_if_i2c.cpp b/Marlin/src/HAL/shared/eeprom_if_i2c.cpp
new file mode 100644
index 0000000..70bb240
--- /dev/null
+++ b/Marlin/src/HAL/shared/eeprom_if_i2c.cpp
@@ -0,0 +1,89 @@
+/**
+ * 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(I2C_EEPROM)
+
+#include "eeprom_if.h"
+#include <Wire.h>
+
+#ifdef __STM32F1__
+  void eeprom_init() { Wire.begin(); }
+#else
+  #ifndef I2C_SDA_PIN
+    #define I2C_SDA_PIN PB7
+  #endif
+  #ifndef I2C_SCL_PIN
+    #define I2C_SCL_PIN PB6
+  #endif
+  void eeprom_init() { Wire.begin((uint8_t)I2C_SDA_PIN, (uint8_t)I2C_SCL_PIN); }
+#endif
+
+
+#if ENABLED(USE_SHARED_EEPROM)
+
+#ifndef EEPROM_WRITE_DELAY
+  #define EEPROM_WRITE_DELAY    5
+#endif
+#ifndef EEPROM_DEVICE_ADDRESS
+  #define EEPROM_DEVICE_ADDRESS  0x50
+#endif
+
+static constexpr uint8_t eeprom_device_address = I2C_ADDRESS(EEPROM_DEVICE_ADDRESS);
+
+// ------------------------
+// Public functions
+// ------------------------
+
+void eeprom_write_byte(uint8_t *pos, unsigned char value) {
+  const unsigned eeprom_address = (unsigned)pos;
+
+  Wire.beginTransmission(eeprom_device_address);
+  Wire.write(int(eeprom_address >> 8));   // MSB
+  Wire.write(int(eeprom_address & 0xFF)); // LSB
+  Wire.write(value);
+  Wire.endTransmission();
+
+  // wait for write cycle to complete
+  // this could be done more efficiently with "acknowledge polling"
+  delay(EEPROM_WRITE_DELAY);
+}
+
+uint8_t eeprom_read_byte(uint8_t *pos) {
+  const unsigned eeprom_address = (unsigned)pos;
+
+  Wire.beginTransmission(eeprom_device_address);
+  Wire.write(int(eeprom_address >> 8));   // MSB
+  Wire.write(int(eeprom_address & 0xFF)); // LSB
+  Wire.endTransmission();
+  Wire.requestFrom(eeprom_device_address, (byte)1);
+  return Wire.available() ? Wire.read() : 0xFF;
+}
+
+#endif // USE_SHARED_EEPROM
+#endif // I2C_EEPROM
-- 
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