ChiHardware-8051Serial.asm

; 8051 serial communication
; -------------------------

; Serial Controller, SCON register

; 7	SM0	9Fh	Serial port mode bit 0
; 6	SM1	9Eh	Serial port mode bit 1.
; 5	SM2	9Dh	Mutliprocessor Communications Enable (explained later)
; 4	REN	9Ch	Receiver Enable. This bit must be set in order to receive characters.
; 3	TB8	9Bh	Transmit bit 8. The 9th bit to transmit in mode 2 and 3.
; 2	RB8	9Ah	Receive bit 8. The 9th bit received in mode 2 and 3.

; Ignore Everything Above, not needed
; 1	TI	99h	Transmit Flag. Set when a byte has been completely transmitted.
; 99 is set, when mov a,sbuf Or a read operation is done
; 0	RI	98h	Receive Flag. Set when a byte has been completely received.
; 98 is set when mov sbuf,a or a write operation is done

; Single byte sending
; Sender
; -------
; Only A can move to sbuf, so add data to a
mov a,#56 
; Move the data to sbuf, serial buffer will automatically be available on the other side
mov sbuf,a
ending: sjmp ending

;Receiver
; --------
; Data pit
mov dptr,#4500
; clear receive flag, so that old data does not affect int
clr 98
; wait till 98 is set, checks for a bit set
here : jnb 98,here
; Now data has come, read it and put it wherever
mov a,sbuf
; wherever
mov @dptr,a
ending: sjmp ending

; Array of size five Sending
; Sender
; -------
; Data is gotten from here
mov dptr,#4600
;no of data pts
mov r1,#05
; clear transmit flag
repeat:clr 99
; first time, we don't have to wait till read, so send directly
mov a,@dptr
mov sbuf,a
inc dptr
;next time, wait till he has read
here: jnb 99,here
;loop back
djnz r1,repeat
; Only A can move to sbuf, so add data to a
mov a,#56 
; Move the data to sbuf, serial buffer will automatically be available on the other side
mov sbuf,a
ending: sjmp ending

;Receiver
; --------
; Data pit
mov dptr,#4500
;no of data
mov r1,#05
; clear receive flag, so that old data does not affect int
repeat:clr 98
; wait till 98 is set, checks for a bit set
here : jnb 98,here
; Now data has come, read it and put it wherever
mov a,sbuf
; wherever
mov @dptr,a
inc dptr
djnz r1,repeat
ending: sjmp ending

ChiHardware-ParallelPort.cpp

// 		13  
// 	25
// 		12  
// 	24
// 		11  
// 	23
// 		10  
// 	22
// 		09  D7
// 	21
// 		08  D6
// 	20
// 		07  D5
// 	19
// 		06  D4
// 	18
// 		05  D3
// 	17
// 		04  D2
// 	16
// 		03  D1
// 	15
// 		02  D0
// 	14
// 		01  

// This will be the view after the cable has been connected
// We need the pins D0 to D7

// Connect those to led for output mode test
// Connect to switch for input mode test
// Connect to D0 to D7 of second computer for communication



// Programs
// --------

// Sender/Output
// -------------
/*For shit requiring io port manipulations*/
#include<sys/io.h>

/*Address of parallel port, 0x is hex, 378 is hex address*/
portAddress=0x378

/*get permission for 3 bytes after 378, (ie, addresses 0x378, 0x379, 0x37A*/
/*base - which address to start asking for permission*/
/*3 - how many bytes required*/
/*1 - permission bool, 1 - get perm, 0 - release perm*/
/*Returns 0 if success and -1 if fail*/
returnVal=ioperm(base,3,1);
if (returnVal==-1)
	// failed

/*Set 0x37A, the command register to make parallel port act in output mode*/
outb(0x0B,base+2);

/*output number you want, maybe in loop, maybe from file, wherever*/
// loop maybe?
outb(mynumber,base);


/*Release perm*/
ioperm(base,3,0);


// Input/Receiver
// --------------
/*For shit requiring io port manipulations*/
#include<sys/io.h>

/*Address of parallel port, 0x is hex, 378 is hex address*/
portAddress=0x378

/*get permission for 3 bytes after 378, (ie, addresses 0x378, 0x379, 0x37A*/
/*base - which address to start asking for permission*/
/*3 - how many bytes required*/
/*1 - permission bool, 1 - get perm, 0 - release perm*/
/*Returns 0 if success and -1 if fail*/
returnVal=ioperm(base,3,1);
if (returnVal==-1)
	// failed

/*Set 0x37A, the command register to make parallel port act in input mode*/
// DIFFERENCE
outb(0x2B,base+2);

/*input from base, maybe in loop to a file? wherever*/
// loop maybe?
// DIFFERENCE
mynumberReceived=inb(base);


/*Release perm*/
ioperm(base,3,0);