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TESTING THE SYSTEM 229
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Morse code generation speed, to generate a Dash, or to generate a Dot.
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3. Get Keycode: This routine is called to check which key has been pressed. If no key is
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pressed, this routine waits for a key or a combination of keys to be pressed. It then returns a key code for the main program to interpret and take appropriate action. Play Dash: This routine generates an audio tone for a period equal to three times a dot period. After the tone, it produces a period of no tone equal to a dot-period length. Play Dot: This routine sets up the Timer0 interrupt routine to generate an audio tone for T time units. This is the basic time period of the Morse code generation speed. After the tone, it produces a no-tone period of T time units. Increment Speed: This routine increments the speed counter in increments of 10. Decrement Speed: This routine decrements the speed counter in steps of 10. Timer0 ISR: This is the heart of the program. This routine generates the audio tone at a frequency of 446 Hz. It also increments a temporary counter to indicate how many pulses of the audio tone have been generated. This counter is used by the play dash and the play dot routines to determine if the dash (or dot) period is over or not.
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It should be noted that the AT90S1200 does not have an SRAM-based stack, but a hardware stack that has a maximum depth of three. Therefore the code is written in such a way that at any given time there are no more than two nested subroutines. This is to accommodate the possibility of the Timer0 interrupt occurring when up to two nested subroutines are called from the main program.
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11.8 Testing the System
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After the code was written on the Atmel AVR evaluation board, pressing the keys gave a response as expected. The speed could be varied by pressing the Mode switch in combination with the playdot/decrease speed or the playdash/increase speed keys. I then observed the Audio output on the PB7 pin of the processor on a digital oscilloscope. The traces captured on the scope are illustrated in Figures 11.3, 11.4, and 11.5, and they confirm the correct operation of the system.
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230 AVR PROJECT 2: A MORSE KEYER
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1 Time Unit
1 Time Unit
A continuous Morse DOT output from the Morse Keyer Circuit
FIGURE 11.3 Oscillogram for Morse code output for DOT, generated by the Keyer circuit.
3 T time units
1 T time unit
Morse output for a continuous dash from the Morse Keyer Circuit
FIGURE 11.4 Oscillogram for Morse code output for DASH, generated by the Keyer circuit.
TESTING THE SYSTEM 231
Morse output for the letter U (di-di-dah) generated by the Morse Keyer Circuit
FIGURE 11.5 Oscillogram for Morse code output for the character U, generated by the Keyer circuit.
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AVR PROJECT 3: A SIMPLE DUAL-CHANNEL VOLTMETER
12.1 At a Glance
n this chapter we look at an AT90S2313-based dual-channel voltmeter using the MAX111 ADC. The features of the system are:
1. 2. 3. 4.
Dual-channel voltmeter with LCD display. Driver software in C. User interface switches. Can be modified to download readings to a PC.
12.2 Introduction
In this chapter we have a project that connects the AT90S2313 controller to the MAX111 ADC and a 2 16 character LCD display. The controller converts voltage on both channels of the ADC and displays the result on the LCD. The voltage corresponding to channel 1 is displayed on one of the lines, and the voltage corresponding to the other channel is displayed on the other line. The voltmeter indicates the sign of the applied voltage as well as provides an overvoltage indication. Figure 12.1 illustrates the voltmeter block diagram.
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234 AVR PROJECT 3: A SIMPLE DUAL-CHANNEL VOLTMETER
12.3 Design Description
Figure 12.2 illustrates the circuit schematic for the dual-channel voltmeter. The LCD is connected to PORTB pins with a 4-bit interface in write-only mode. The ADC is connected to the PORTD pins. Switches SW2 and SW3 have been provided for user interface. Currently, they are not being used but can be utilized for any specific need, or they could be replaced and the PD0, PD1 pins could be used to communicate with a serial port for data-logging purposes. The reference voltage to the ADC is through a 2.5-V zener. An LM336-2.5 V could be used. The range of the voltmeter is 2.5 V maximum. By changing the reference voltage, the input range of the voltmeter can be changed. The circuit needs 5 V for operation. The controller operates at 3.58-MHz clock.
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