Bad EEPROM dump from ATmega328p using Adafruit 'Arduino as ISP' programmer #990
Description
- Using the following as a simple test case, avrdude (version 7.0-20220610 (6a8f0d9)) produce a bad EEPROM dump.
#include <avr/io.h>
#include <avr/eeprom.h>
int main(void) {
uint16_t data=0;
for (uint16_t i=0; i<1024; i++) {
eeprom_write_word((uint16_t *) i, 0xff);
}
for (uint16_t i=0; i<512; i+=0x20) {
eeprom_write_word((uint16_t *) i, data);
data += 0x11;
}
for (uint16_t i=0; i<512; i+=0x20) {
data = eeprom_read_word((uint16_t *) i);
}
return(0);
}
- EEPROM address 0x100 suppose to contain 0x88 and this is verified using serial print and avrdude terminal (-t).
- Using memory operation (-U) produce a bad EEPROM dump (
bad-dump.hex.gz. The data seems to repeat itself at the 256 boundary i.e. 0x100, 0x200, 0x300. Command used are as follows:
avrdude -c stk500v1 -p m328p -P /dev/ttyUSB0 -b 19200 -U eeprom:r:dump.hex:i