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A SAMPLE BX-24 PROGRAM
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The PlaySound function outputs a waveform that, when connected to an amplifier via a decoupling capacitor, allows you to play previously sampled sound that has been stored in the EEPROM. You can play back sounds at various sampling rates and control the number of times the sound is repeated. The repeat function is a handy way to stretch a relatively short sound sample into a longer one for example, the chug-chug of a machine motor or a series of blips.
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In addition to BX-24 s built-in functions, you can access many of the internal hardware registers of the BX-24 chip. The BX-24 is based on the Atmel AT90S8535 microcontroller (download the data sheet for the 8535 to learn more about the internals of this powerful chip). By controlling the hardware registers of the BX-24 you can program features that the BasicX language itself does not directly support. For example, by setting a few registers for Timer1 (one of three timers in the Atmel 8535), you can produce dual pulse width modulated (PWM) signals, which are useful for controlling the speed of DC motors. In a practical circuit, you will need to interface the two PWM outputs of the BX-24 to a suitable transistor or H-bridge circuit in order to provide enough drive current to run the motors. Working directly with the hardware registers of the BX-24 is not for the feint of heart, however. If you want to try this technique, first study the Atmel AT90S8535 data sheet and learn how the registers of the chip work. It s entirely possible to set the registers in a way that will crash the chip, rendering it inoperative (of course, you can always reset the BX24 and try again with a new program).
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A Sample BX-24 Program
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Constructing a BX-24 program involves at least one subroutine, called Main, and one or more BasicX commands. In the following program example, the BX-24 flashes its red and green LEDs on and off several times each second.
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Sub Main() ' BX-24 LED demonstration. Const GreenLED As Byte = 26 Const RedLED As Byte = 25 Const LEDon As Byte = 0 Const LEDoff As Byte = 1 Do ' Red pulse. Call PutPin(RedLED, LEDon) Call Delay(0.07) Call PutPin(RedLED, LEDoff) Call Delay(0.07) ' Green pulse.
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Call PutPin(GreenLED, LEDon) Call Delay(0.07) Call PutPin(GreenLED, LEDoff) Call Delay(0.07) Loop End Sub
Here s how the program works. The following commands,
Sub Main() ... End Sub
form the main subroutine that is automatically executed when the BX-24 is first turned on or when it is reset. You can have additional subroutines in the program, each with a different name, but at a minimum you need one subroutine called Main to get things started:
Const Const Const Const GreenLED As Byte = 26 RedLED As Byte = 25 LEDon As Byte = 0 LEDoff As Byte = 1
These lines define four constants, using the Const statement (similar to Dim). Const stands for constant and represents a variable that will never be changed again in the program. In this example, each Const statement defines three things:
I The name of the variable, such as GreenLED or LEDon. I The type of variable (how many bits it requires). In all four instances the variables are
of type Byte and each requires eight bits
I The value of each variable. For example, GreenLED is assigned the value 26; LEDoff is
assigned the value 0. All four constants are used elsewhere in the program, and they serve as a convenient way to change values should that ever be necessary. The statements,
Do ... Loop
set up an infinite loop. That is, the loop repeats for as long as power is applied to the BX24 (or until the chip is reset). Without the Do Loop statements the commands in the program would execute just once. The loop provides a simple way to repeat the commands indefinitely:
' Red pulse. Call PutPin(RedLED, LEDon) Call Delay(0.07) Call PutPin(RedLED, LEDoff) Call Delay(0.07)
Each BasicX function, such as PutPin, is preceded by an optional Call statement. This tells the BasicX operating system to perform the named function. The PutPin function, called
CONTROLLING RC SERVOS WITH THE BX-24 511
twice in this example, changes the state of a specified I/O line. Note the use of the constants. The syntax for PutPin is as follows:
PutPin (PinNumber; Value)
where PinNumber is the number of the pin you want to use (e.g., pin 25 for the red LED), and Value is either 1 for on (or logical HIGH) or 0 for off (or logical LOW). The Delay function causes the BX-24 to pause a brief while, in this case 70 milliseconds. Delay is called twice, so there is a period of time between the on/off flashing of each LED:
' Green pulse. Call PutPin(GreenLED, LEDon) Call Delay(0.07) Call PutPin(GreenLED, LEDoff) Call Delay(0.07)
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