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Only write to EEPROM when a byte changes

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This commit is contained in:
Scott Lahteine 2016-12-09 03:45:04 -08:00
parent 8383f35b40
commit 53c9fca0f6
1 changed files with 18 additions and 7 deletions
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25
Marlin/configuration_store.cpp
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@ -135,16 +135,25 @@
uint16_t eeprom_checksum;
const char version[4] = EEPROM_VERSION;
bool eeprom_write_error;
void _EEPROM_writeData(int &pos, uint8_t* value, uint8_t size) {
uint8_t c;
if (eeprom_write_error) return;
while (size--) {
eeprom_write_byte((unsigned char*)pos, *value);
c = eeprom_read_byte((unsigned char*)pos);
if (c != *value) {
SERIAL_ECHO_START;
SERIAL_ECHOLNPGM(MSG_ERR_EEPROM_WRITE);
uint8_t * const p = (uint8_t * const)pos;
const 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);
eeprom_write_error = true;
return;
}
}
eeprom_checksum += c;
eeprom_checksum += v;
pos++;
value++;
};
@ -203,6 +212,8 @@ void Config_Postprocess() {
EEPROM_START();
eeprom_write_error = false;
EEPROM_WRITE(ver); // invalidate data first
EEPROM_SKIP(eeprom_checksum); // Skip the checksum slot