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🐛 Fix small/huge I2C EEPROM address (#22081)

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Kyle Repinski 2021-06-08 18:56:16 -05:00 committed by GitHub
parent 70b80fcd16
commit 7c5e3b9071
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GPG key ID: 4AEE18F83AFDEB23
1 changed files with 17 additions and 4 deletions
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21
Marlin/src/HAL/shared/eeprom_if_i2c.cpp
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@ -61,11 +61,24 @@ static constexpr uint8_t eeprom_device_address = I2C_ADDRESS(EEPROM_DEVICE_ADDRE
// Public functions
// ------------------------
#define SMALL_EEPROM (MARLIN_EEPROM_SIZE <= 2048)
// Combine Address high bits into the device address on <=16Kbit (2K) and >512Kbit (64K) EEPROMs.
// Note: MARLIN_EEPROM_SIZE is specified in bytes, whereas EEPROM model numbers refer to bits.
// e.g., The "16" in BL24C16 indicates a 16Kbit (2KB) size.
static uint8_t _eeprom_calc_device_address(uint8_t * const pos) {
const unsigned eeprom_address = (unsigned)pos;
return (SMALL_EEPROM || MARLIN_EEPROM_SIZE > 65536)
? uint8_t(eeprom_device_address | ((eeprom_address >> (SMALL_EEPROM ? 8 : 16)) & 0x07))
: eeprom_device_address;
}
static void _eeprom_begin(uint8_t * const pos) {
const unsigned eeprom_address = (unsigned)pos;
Wire.beginTransmission(eeprom_device_address);
Wire.write(int(eeprom_address >> 8)); // Address High
Wire.write(int(eeprom_address & 0xFF)); // Address Low
Wire.beginTransmission(_eeprom_calc_device_address(pos));
if (!SMALL_EEPROM)
Wire.write(uint8_t((eeprom_address >> 8) & 0xFF)); // Address High, if needed
Wire.write(uint8_t(eeprom_address & 0xFF)); // Address Low
}
void eeprom_write_byte(uint8_t *pos, uint8_t value) {
@ -81,7 +94,7 @@ void eeprom_write_byte(uint8_t *pos, uint8_t value) {
uint8_t eeprom_read_byte(uint8_t *pos) {
_eeprom_begin(pos);
Wire.endTransmission();
Wire.requestFrom(eeprom_device_address, (byte)1);
Wire.requestFrom(_eeprom_calc_device_address(pos), (byte)1);
return Wire.available() ? Wire.read() : 0xFF;
}