The LLD_GET_PACKET should transfer a data packet from a hardware interface or a software queue, to the calling program, is should use DPTR as a pointer where so save the recieved packet, if there were no packet to recieve it should return ACC > 0 else ACC should be 0, R1.R0 should contain the length of the recieved data packet

LLD_SEND_PACKET uses DPTR as a pointer from where data should be read, R1.R0 contains length of packet. ld_send_packet doesnt need to return anything.