CMD_RET_DATA
[CMD_RET_DATA] = "RET_DATA",
i2c->at_t_done = (cmd == CMD_RET_DATA || cmd == CMD_RET_ACK);
[CMD_RET_DATA] = LINESTAT_INPUT_HELD_V,
next_cmd = CMD_RET_DATA;
case CMD_RET_DATA:
next_cmd = CMD_RET_DATA;