ADDR_LEN
int write_cmd = loc | (EE_WRITE_CMD << ADDR_LEN);
for (i = 4 + ADDR_LEN; i >= 0; i--) {
int ewen_cmd = (w_en ? 0x3f : 0) | (EE_EWEN_CMD << ADDR_LEN);
int read_cmd = loc | (EE_READ_CMD << ADDR_LEN);