From 7cfaa50148270aa9d5cf2580944601ea2aee021b Mon Sep 17 00:00:00 2001 From: Scott Lahteine Date: Wed, 17 Mar 2021 21:36:10 -0500 Subject: [PATCH] Revert "Fix small wired EEPROM (#21337)" Reverting commit cc3e878f90 pending further investigation. --- Marlin/src/HAL/shared/eeprom_if_i2c.cpp | 25 +++++++------------------ 1 file changed, 7 insertions(+), 18 deletions(-) diff --git a/Marlin/src/HAL/shared/eeprom_if_i2c.cpp b/Marlin/src/HAL/shared/eeprom_if_i2c.cpp index 299bc34c49..da70af2772 100644 --- a/Marlin/src/HAL/shared/eeprom_if_i2c.cpp +++ b/Marlin/src/HAL/shared/eeprom_if_i2c.cpp @@ -51,18 +51,6 @@ void eeprom_init() { static constexpr uint8_t eeprom_device_address = I2C_ADDRESS(EEPROM_DEVICE_ADDRESS); -void _beginTransmission(const uint16_t memoryAddress) { - if (MARLIN_EEPROM_SIZE > 0x4000) { // Use two-byte addressing for EEPROMs >16kb - Wire.beginTransmission(eeprom_device_address); - Wire.write(memoryAddress >> 8); // Address High Byte - } - else { - const uint8_t addr = eeprom_device_address | byte((memoryAddress >> 8) & 0x07); - Wire.beginTransmission(addr); - } - Wire.write(memoryAddress & 0xFF); // Address Low Byte (or only byte for chips <= 16Kb like 24C02/04/08/16) -} - // ------------------------ // Public functions // ------------------------ @@ -70,7 +58,9 @@ void _beginTransmission(const uint16_t memoryAddress) { void eeprom_write_byte(uint8_t *pos, unsigned char value) { const unsigned eeprom_address = (unsigned)pos; - _beginTransmission(eeprom_address); + Wire.beginTransmission(eeprom_device_address); + Wire.write(int(eeprom_address >> 8)); // MSB + Wire.write(int(eeprom_address & 0xFF)); // LSB Wire.write(value); Wire.endTransmission(); @@ -82,12 +72,11 @@ void eeprom_write_byte(uint8_t *pos, unsigned char value) { uint8_t eeprom_read_byte(uint8_t *pos) { const unsigned eeprom_address = (unsigned)pos; - _beginTransmission(eeprom_address); + Wire.beginTransmission(eeprom_device_address); + Wire.write(int(eeprom_address >> 8)); // MSB + Wire.write(int(eeprom_address & 0xFF)); // LSB Wire.endTransmission(); - - // For EEPROMs <=16Kb the lower address bits are used for 2Kb page address - const int addr = eeprom_device_address | (MARLIN_EEPROM_SIZE <= 0x4000 ? byte((eeprom_address >> 8) & 0x07) : byte(0)); - Wire.requestFrom(addr, byte(1)); + Wire.requestFrom(eeprom_device_address, (byte)1); return Wire.available() ? Wire.read() : 0xFF; }