PTP_CHDK_S_MSGSTATUS_OK  855 core/ptp.c           ptp.param1 = PTP_CHDK_S_MSGSTATUS_OK;
PTP_CHDK_S_MSGSTATUS_OK  867 core/ptp.c           if(ptp.param1 != PTP_CHDK_S_MSGSTATUS_OK) {