How programming Random Algorithm

[J_expoler2]

Hi.
any one can advice randomalgorithm on assembly 8051 and AVR
thanks

 

[yager]

formula: seed = seed * 1021 + 41
pseudo random: cycle = 65536
51's assembly code:

Random:			;R6,R7=Seed.H,Seed.L
	CLR     C
	CLR     A
	SUBB    A,R7
	MOV     R5,A
	MOV     A,R7
	SUBB    A,R6
	MOV     R4,A	;*255
	MOV     A,R5
	ADD     A,R5
	MOV     R5,A
	MOV     A,R4
	ADDC    A,R4
	MOV     R4,A
	MOV     A,R5
	ADD     A,R5
	MOV     R5,A
	MOV     A,R4
	ADDC    A,R4
	MOV     R4,A
	MOV     A,R5
	ADD     A,R7
	MOV     R7,A
	MOV     A,R4
	ADDC    A,R6
	MOV     R6,A	;*1021
	MOV     A,#41
	ADD     A,R7
	MOV     R7,A
	CLR     A
	ADDC    A,R6
	MOV     R6,A
	RET

FYR

 

[mr_ghz]

Hi J_expoler2,

random sequences are generated by a PN-generator (PN = pseudo noise).
Such a generator is made of a shift-register an one or more EXOR-gates.
This can be built easily in hardware (CPLD) or programmed in a uC. When
you search the internet wit PN, pseudo noise you will find some examples.

Bye