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Each box will have two connection to the PIC, first method is separated eight bits to 4 boxes, while the second method is presented in matrix form for indicating the four boxes. The first method is mo ...

I see no reason to use a while loop. Generally, no code that potentially repeats forever should be used.

which while loop that u mean? The main one, while (1) or the one i put in first post, while ...

It is an idea different from the above, but basically there are alike, i come out with two ideas.
Input XXXX XXXX - take the last 4 bits

XX XX
col2 col1 row2 ...

Use all the eight bit, XXXX XXXX

XX | XX | XX | XX
box4 | box3 | box2 | box1

while (1);
{
while (input(pin_B0) && input (pin_B1))
&# ...

Ok. From the help file,
usb_cdc_getc() : reads and return a character from the receive buffer
usb_cdc_putc() : put a character into the transmit buffer

The receive buffer and transmit buffer ment ...

putc() will not work with USB, use serial communication instead, its easier to test and debug. When you have tested the code, you can then upgrade to USB.

what do u mean by serial communication, i ...

I saw this command in help file:
int16 i=PIN_B1;
Why there is int16 in front? Is it mean reading value from pin_b1 and i equal to that value?

SC0SR EQU $00CC
SC0DR EQU $00CF
ORG $8000

MAIN LDAA #00
LDAA $0258
CMPA #00
BEQ MAIN

SEND STAA SC0DR
BRCL ...

Oh, is like that how I know the binary form of the pin? Is it the same with the HC12? I need to know it so that I only need to send the data to the PC via USB port, and specify the data from the API l ...

Mean that i can write the coding like this?:

int a;
a==input_b();

switch (a)
{
case 1:
output_low(pin_C0);
break;
case 2:
...

Read the 4 bits. Combine them into the lower 4 bits of one byte.

Sorry, i don't understand what do u mean... Can u explain more?

Thanks for your reply!!!

My coding idea is that there are four inputs(indicate by row1, row2 and column1, column2). The input is in matrix form:
eg: column1 column2
row1 1 2
row ...