read barcode from image c#.net STACK OPERATION IN AVR PROSESSORS 103 in Software

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STACK OPERATION IN AVR PROSESSORS 103
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;call the subroutine to ;determine which switch is pressed. ;the subroutine returns the result ;in register r17 out PORTB, r17 ;output the value on PORTB rjmp loopit ;get more ; *********** ;GET_SWITCH: Subroutine to determine which switch is pressed. ;switch on return value in r17 ; PD0 0b11111110 ; PD1 0b11111101 ; PD2 0b11111011 ; PD3 0b11110111 ;registers destroyed: r18, r19 ;subroutines called: delay20ms ; *********** get_switch: in r18, PIND ;read PIND buffer andi r18, $0F ; cpi r18, $0F ;if no switch is pressed ;then loop back till pressed breq get_switch cpi r18, 0b00001110 ;check is SW0 is pressed brne not_0 ;if not check more its_0: rjmp next_step not_0: cpi r18, 0b00001101 ;check is SW1 is pressed brne not_1 ;if not check more its_1: rjmp next_step not_1: cpi r18, 0b00001011 ;check is SW2 is pressed brne not_2 ;if not check more its_2: rjmp next_step not_2: cpi r18, 0b00000111 ;check is SW3 is pressed brne get_switch ;if not some problem, so go back next_step: rcall delay20ms ;call a debounce delay routine waitfor_rel: ;now wait for the switch to be in r19, PIND ;be released andi r19, $0F ;when the switch is released, all cpi r19, $0F ;PIND0-3 bits will be 1 brne waitfor_rel rcall delay20ms ;OK, the switch is released ;debounce it mov r17, r18 ;put the switch code in r17 ori r17, $F0 ret ;and return
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;assembled using Atmel s avrasm ;the following .inc file should ;this assembly program .include 1200def.inc .cseg .org 0 rjmp RESET rjmp RESET rjmp RESET RESET: ldi r16, 0b11111111 out DDRB, r16 ldi r16, 0b00000000 out DDRD, r16 ldi r16, 255 out PORTB, r16 loopit: rcall get_switch
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assembler. be placed in the same directory as
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;Reset Handle
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;load register r16 with all 1 s ;configure PORT B for all outputs ;load register r16 with all 0 s ;configure PORTD for all inputs ;all LEDs off
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104 HARDWARE AND SOFTWARE INTERFACING WITH THE AVR
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; *********** ;DELAY20MS: A 20ms delay subroutine ;Crystal Frequency is 4MHz ;registers destroyed: r21, r20 ; *********** delay20ms: ldi r21, 31 outer_loop: ldi r20, 255 inner_loop: nop nop nop nop nop nop nop dec r20 brne inner_loop dec r21 brne outer_loop ret
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6.4 Implementing Combinational Logic
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In a previous chapter we mentioned how a controller can be used to implement a simple combinational logic equation as illustrated in Figure 1.3 in 1. The figure shows four inputs connected to the PB0, PB1, PB2, and PB3 pins. The output of the circuit is on pin PB4. The following program will implement the logic equation:
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Output = ((/A * B) + (/B * A)) * (C * /D)
The following program (also available on the CD as combi.asm) is only to illustrate how the AVR can be used to implement combinational logic. The program is not optimized. For example, the required output needs an XOR between two inputs, which the AVR can perform. However, I have chosen to implement the XOR using NOT, AND, and OR instructions.
;combi.asm .include 1200def.inc .def A=r16 .def Abar=r17 .def B=r18 .def Bbar=r19 .def C=r20 .def Dbar=r21 .def temp=r22 .cseg .org 0 rjmp RESET ;reset handle RESET: ldi temp, 0b00001111;
CONNECTING THE AVR TO THE PC SERIAL PORT 105
out DDRB, temp loop_here: in temp, PINB mov A, temp mov Abar, temp com Abar mov B, temp mov Bbar, temp com Bbar mov C, temp mov Dbar, temp com Dbar andi A, 1 andi Abar, 1 lsr B lsr Bbar lsr C lsr C lsr Dbar lsr Dbar lsr Dbar andi B, 1 andi Bbar, 1 andi C, 1 andi Dbar, 1 and A, Bbar and B, Abar and C, Dbar or A, B and A, C and A, 1 cpi A, 1 breq Its1 cbi PORTB, 4 rjmp loop_here Its1: sbi PORTB, 4 rjmp loop_here
;PB0-3 are inputs ;PB4-7 are outputs ;read PORTB pins
;invert A
;invert B
;invert D ;isolate the bit for A ;isolate the bit for Abar ;get input B to position bit0 ;get input C to position bit0 ;get input D to position bit0
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