I am trying to set up a function call that will send 6 packets

of information. (a packet is 8 bits) I then need to turn around

and read the packet information that is returned. Each set of

8 bits should be stored in a file register for latter use. I would

like to call this routine, send the packets and return to wait for

the responce, store the data and return to the original calling

function. I have wrote this myself and find that I am using to

much memory and bad programming techniques. I should be

able to set up the packets and call this routine.

Please Help a very sleepy man who is getting no ware fast.

Thank you.

Gordon Varney

MCPU = 16F84

VDI = S164 DSP Core

MHS = Master Hand Shake (MCPU Pin 2, RA3)

SHS = Slave Hand Shake (MCPU Pin 12, RB6)

DATA = Data Bit (MCPU Pin 13, RB7)

Data is transfered one bit at a time with full handshaking as described below.

1) When the MCPU has data to Transmit to the VDI, the MCPU sets DATA

to the data value, verifies that SHS is in the high state, then sets MHS to the

low state to request a transfer.

2) The VDI senses the low state of MHS and reads DATA, which then sets

SHS to the low state to acknowledge the DATA.

3) The MCPU senses the low state of SHS, and sets MHS to the high state

to Indicate that DATA is no longer valid, and at the same time sets DATA

high (releasing it).

4) The VDI then sets SHS to the high state to indicate that the cycle is complete.

Both devices are now ready to tranffer the next data bit.