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Fix small wired EEPROM (#21337)
Co-Authored-By: jafal99 <26922965+jafal99@users.noreply.github.com>
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@ -51,6 +51,18 @@ void eeprom_init() {
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static constexpr uint8_t eeprom_device_address = I2C_ADDRESS(EEPROM_DEVICE_ADDRESS);
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void _beginTransmission(const uint16_t memoryAddress) {
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if (MARLIN_EEPROM_SIZE > 0x4000) { // Use two-byte addressing for EEPROMs >16kb
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Wire.beginTransmission(eeprom_device_address);
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Wire.write(memoryAddress >> 8); // Address High Byte
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}
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else {
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const uint8_t addr = eeprom_device_address | byte((memoryAddress >> 8) & 0x07);
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Wire.beginTransmission(addr);
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}
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Wire.write(memoryAddress & 0xFF); // Address Low Byte (or only byte for chips <= 16Kb like 24C02/04/08/16)
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}
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// ------------------------
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// Public functions
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// ------------------------
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@ -58,9 +70,7 @@ static constexpr uint8_t eeprom_device_address = I2C_ADDRESS(EEPROM_DEVICE_ADDRE
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void eeprom_write_byte(uint8_t *pos, unsigned char value) {
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const unsigned eeprom_address = (unsigned)pos;
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Wire.beginTransmission(eeprom_device_address);
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Wire.write(int(eeprom_address >> 8)); // MSB
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Wire.write(int(eeprom_address & 0xFF)); // LSB
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_beginTransmission(eeprom_address);
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Wire.write(value);
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Wire.endTransmission();
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@ -72,11 +82,12 @@ void eeprom_write_byte(uint8_t *pos, unsigned char value) {
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uint8_t eeprom_read_byte(uint8_t *pos) {
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const unsigned eeprom_address = (unsigned)pos;
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Wire.beginTransmission(eeprom_device_address);
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Wire.write(int(eeprom_address >> 8)); // MSB
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Wire.write(int(eeprom_address & 0xFF)); // LSB
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_beginTransmission(eeprom_address);
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Wire.endTransmission();
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Wire.requestFrom(eeprom_device_address, (byte)1);
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// For EEPROMs <=16Kb the lower address bits are used for 2Kb page address
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const int addr = eeprom_device_address | (MARLIN_EEPROM_SIZE <= 0x4000 ? byte((eeprom_address >> 8) & 0x07) : byte(0));
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Wire.requestFrom(addr, byte(1));
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return Wire.available() ? Wire.read() : 0xFF;
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}
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