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Are there any possible alternatives to the circuit we have chosen to implement Yes, many. Well, at least two. Figure 10.6 shows a possible alternative. Here we have used a common anode sevensegment display. A resistor for limiting current through each of the seven segments would be required. The processor program would need to change to drive the seven segment display accordingly.
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CODE DEVELOPMENT 213
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R RST
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AT90S1200
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FIGURE 10.6 Block diagram for an alternative electronic dice circuit. R is a current-limiting resistor for each of the segment LEDs of the sevensegment display.
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Figure 10.7 shows another possible alternative, not much different from our actual implementation, except that each LED is driven independently by an output pin of the processor. That only puts more demands on the processor resources. For this simple project using an AT90S1200, that may not be a big deal, as the extra required output pins are available, but if you want to port it to a different processor with fewer pins, that may not be possible. Also, this scheme, like the last one, requires extra resistors.
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How does one go about developing the whole system to be even as simple as the present one Does one put together the hardware and then write code for it, or develop code first and then build the hardware This is a tough question and there is no unique answer to this. It will depend on a particular application. Generally, it is a good idea to write and test as much code as possible using a simulator or a prototype board. For this application, I used the Atmel s evaluation board, MCU00100 (this has now been superseded by the more advanced STK200 and STK300 boards provided by Atmel) and wrote and tested all of the code. Once the code worked as I wanted, I went ahead and built the circuit on a general-purpose PCB as described in the next section. The code itself evolved. I present the three versions of code, each with some improvement over the previous version. These three versions of code are put in assembler files named ugly_dice.asm, bad_dice.asm, and good_dice.asm. The program in ugly_dice.asm was the result of the first attempt at programming the dice. It differs from the code in bad_dice.asm in the way the random number is output on the LEDs. I ended up writing complex code to essentially implement an if-then-else structure. Later I realized that for our simple case, such a complex coding scheme is not required. The code in ugly_dice.asm was then simplified and the resulting code is presented in bad_dice.asm.
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214 AVR PROJECT 1
Vcc +5V R RST
AT90S1200
Sample
FIGURE 10.7 Block diagram for another alternative electronic dice circuit. R is a current-limiting resistor for each of the LEDs. The seven LEDs are again arranged as in Figure 10.1.
Finally, power-saving features were added to bad_dice.asm, resulting in the final code in good_dice.asm. Anyway, let us consider the code presented below.
;ugly_dice.asm ; ;In the program I just initialize the Timer0 to count up ;using the CLK/1024 as a clocking source. The Timer0 merrily ;counts up, resets to 0 and starts all over again ad infinitum ;PortB is configured as all output and PortD bit 0 (PD0) ;as an input. The program waits for a key press and then ;takes a snap shot of the Timer0 (register TCNT0), and then ;is further processed before put on the display. read on.. ;Dhananjay V. Gadre ;19th February 1999 .include 1200def.inc .cseg .org 0 rjmp RESET ;Reset Handle RESET: ldi r16, 0b00000101 ;DIV1024 selected for timer0 out TCCR0, r16 ;timer0 counts up now ldi r16, 0b11111111 ;configure PORT B for all outputs out DDRB, r16 cbi DDRD, 0 ;configure pin PD0 as input sbi PORTD,0 ;set the PD0 so that it can act as i/p ;with internal pullup get_t: rcall sw_input ;wait for the switch to be pressed ldi r18, 0b11111111 ;blank off the previous display out PORTB, r18 rcall delay ;wait for some time rcall delay rcall delay rcall delay rcall delay rcall delay in r17, TCNT0 ;read the Timer0 value more: mov r18, r17 ;copy r17 to r18
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