Firmware2/Marlin/src/HAL/HAL_AVR/persistent_store_impl.cpp

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#ifdef __AVR__
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#include "../persistent_store_api.h"
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#include "../../inc/MarlinConfig.h"
#if ENABLED(EEPROM_SETTINGS)
namespace HAL {
namespace PersistentStore {
bool access_start() { return true; }
bool access_finish() { return true; }
bool write_data(int &pos, const uint8_t *value, uint16_t size, uint16_t *crc) {
while (size--) {
uint8_t * const p = (uint8_t * const)pos;
uint8_t v = *value;
// EEPROM has only ~100,000 write cycles,
// so only write bytes that have changed!
if (v != eeprom_read_byte(p)) {
eeprom_write_byte(p, v);
if (eeprom_read_byte(p) != v) {
SERIAL_ECHO_START();
SERIAL_ECHOLNPGM(MSG_ERR_EEPROM_WRITE);
return true;
}
}
crc16(crc, &v, 1);
pos++;
value++;
};
return false;
}
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bool read_data(int &pos, uint8_t* value, uint16_t size, uint16_t *crc, const bool writing/*=true*/) {
do {
uint8_t c = eeprom_read_byte((unsigned char*)pos);
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if (writing) *value = c;
crc16(crc, &c, 1);
pos++;
value++;
} while (--size);
return false; // always assume success for AVR's
}
}
}
#endif // EEPROM_SETTINGS
#endif // __AVR__