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18.4 Fabrication
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This toy was initially developed on the Atmel s AVR evaluation board. After that, it was built on a general-purpose PCB. It runs off a 9-V battery and a 78L05 regulator. Instead of a 9-V battery, even four 1.5-V cells could be used.
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FIGURE 18.2 Circuit schematic for the toy.
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DESIGN CODE 305
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The design for the project is available in the code directory in the file toy3.asm. The code for the system was developed and tested in small pieces to begin with. Some of the subroutines were taken from earlier-developed code, e.g., the LSFR-based random number subroutine was taken from the Dongle project. Similarly, the audio tone generation was modified from the Morse keyer project. Here, of course, the tone generation sunroutine in the form of the Timer0 ISR was a little different, as it had to generate four different tones. In fact, the Timer0 ISR is the most critical section of the code, and let us understand how it works. Even though the AT90S2313 has SRAM that is used for stack, the ISR uses the save_status register (register R0) to save the machine status register SREG. This takes fewer clock cycles than pushing the SREG register on the stack. However, please note that if your application uses the LPM instruction, then R0 register should not be used to save the machine status in an ISR, as the LPM instruction uses the R0 register. Instead, any other register (say R1) could be used. The ISR then puts off all the LEDs and checks if the audio note is to be played or not. The note is played for a short time only when the status flag is set up. After the time for playing the note is over, the ISR clears the status flag and no note is played till the main program sets up this flag again. Depending upon the note to be played, the ISR loads the TCNT0 register accordingly. It also lights up the LED corresponding to the note being played. In the end, it toggles the output bit (PB7) which is connected to the piezo buzzer. If the note-playing time is over, all the LEDs are put off and the output audio bit (PB7) is set to 0. Before the ISR returns to the interrupted program, the SREG processor status register is popped back from the R0 register.
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;This code segment code cannot run as it is, it is here as an ;illustration Timer0_int: in save_status, SREG sbi PORTB, 0 ;first put off all LEDs sbi PORTB, 1 ;on PORTB sbi PORTB, 2 sbi PORTB, 3 sbis PORTB, 7 ;this code increments inc count ;count in alternate ISRs cpi count, PLAY_TIME brne still_time ;if play duration is over ldi stat_flag, 0 ;reset the flag still_time: ;see which note to cpi play_t, 0 ;play brne chk2 ldi play_t, T1 out TCNT0, play_t ldi play_t, 0 sbrc stat_flag, 7 ;first check if note is ;being actually played ;if so, cbi PORTB, 0 ;put on LED on PORTB0 rjmp chk5
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306 AVR PROJECT 9: SA-RA-GA FOLLOW ME A MUSICAL TOY
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cpi play_t, 1 brne chk3 ldi play_t, T2 out TCNT0, play_t ldi play_t, 1 sbrc stat_flag, 7 cbi PORTB, 1 ;put on LED on PORTB1 rjmp chk5 chk3: cpi play_t, 2 brne chk4 ldi play_t, T3 out TCNT0, play_t ldi play_t, 2 sbrc stat_flag, 7 cbi PORTB, 2 ;put on LED on PORTB2 rjmp chk5 chk4: ldi play_t, T4 out TCNT0, play_t ldi play_t, 3 sbrc stat_flag, 7 cbi PORTB, 3 ;put on LED on PORTB3 ;check if flag to play note ;is set to 255 chk5: cpi stat_flag, 255 breq play_it cbi PORTB, 7 ;if no, then clear PB7, so ;that the speaker does not load ;PB7 rjmp no_tone ;note is not to be played ;so just return back ;if flag is set, then play note ;for that just complement PB7 ;stat_flag is being used as a temp ;register. Its value is restored ;later. play_it: in stat_flag, PORTB ldi temp2, $80 eor stat_flag, temp2 out PORTB, stat_flag ldi stat_flag, 255 no_tone: out SREG, save_status reti
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Figure 18.3 illustrates one of the notes being played by the toy. Now that the toy is working well, my son and I are having a great time playing with it.
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