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Improve checksum per https://github.com/gnea/grbl-Mega/issues/158 #159

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Improve checksum per https://github.com/gnea/grbl-Mega/issues/158 #159

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4 changes: 2 additions & 2 deletions grbl/eeprom.c
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Original file line number Diff line number Diff line change
Expand Up @@ -130,7 +130,7 @@ void eeprom_put_char( unsigned int addr, unsigned char new_value )
void memcpy_to_eeprom_with_checksum(unsigned int destination, char *source, unsigned int size) {
unsigned char checksum = 0;
for(; size > 0; size--) {
checksum = (checksum << 1) || (checksum >> 7);
checksum = (checksum << 1) | (checksum >> 7);
checksum += *source;
eeprom_put_char(destination++, *(source++));
}
Expand All @@ -141,7 +141,7 @@ int memcpy_from_eeprom_with_checksum(char *destination, unsigned int source, uns
unsigned char data, checksum = 0;
for(; size > 0; size--) {
data = eeprom_get_char(source++);
checksum = (checksum << 1) || (checksum >> 7);
checksum = (checksum << 1) | (checksum >> 7);
checksum += data;
*(destination++) = data;
}
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