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Fix small wired EEPROM (#21337)

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Co-Authored-By: jafal99 <26922965+jafal99@users.noreply.github.com>
This commit is contained in:
Scott Lahteine 2021-03-14 11:43:20 -05:00 committed by GitHub
parent b9b9a3115a
commit cc3e878f90
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 18 additions and 7 deletions
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25
Marlin/src/HAL/shared/eeprom_if_i2c.cpp
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@ -51,6 +51,18 @@ 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
// ------------------------
@ -58,9 +70,7 @@ static constexpr uint8_t eeprom_device_address = I2C_ADDRESS(EEPROM_DEVICE_ADDRE
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
_beginTransmission(eeprom_address);
Wire.write(value);
Wire.endTransmission();
@ -72,11 +82,12 @@ void eeprom_write_byte(uint8_t *pos, unsigned char value) {
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
_beginTransmission(eeprom_address);
Wire.endTransmission();
Wire.requestFrom(eeprom_device_address, (byte)1);
// 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));
return Wire.available() ? Wire.read() : 0xFF;
}