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The STAMP itself has an RS-232 port, but it does not have the capability to generate and receive the short pulses of either normal or short IrDA. For that, we turn to the MAX3100. It is a universal asynchronous receiver-transmitter (UART) that communicates with the
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BASIC STAMP over the SPI interface, and sends and receives the data to and from the outside world in the form of RS-232 or, optionally, sends and receives the data directly as IrDA. All it takes is an IR emitting diode and an IR photodetector. The MAX3100 requires a 3.6864-MHz crystal, on which it bases its baud rates. The IrDA communicator circuit in Fig. 5-2 has a simple phototransistor as the receiver connected to the RX pin, which is fine for low speeds and short distances. For output from the TX pin, a high-efficiency IR LED is driven directly, sinking current to turn the light on. This is a very short range circuit, a fraction of an inch range. The alternative receiver depicted in Fig. 5-3 uses a Burr-Brown integrated photodiode amplifier to achieve greater sensitivity and speed. The output b from the OPT101 positive inverter circuit would replace the phototransistor input to the RX pin on the MAX3100. If more power is needed on the transmit side, it can be driven by a power transistor or a more capable current source. The red LED D1 and the pushbutton S3, shown in the circuit connected to the RTS\output and CTS/input signal lines on the MAX3100, are for test purposes only, as illustrated in the program below. The MAX3100 has additional desirable features. One of these is a buffer that can hold up to eight received characters until the STAMP gets around to reading them out. Another feature is a sleep mode, with automatic wake-up on detection of a start bit. (Note that the MAX3100 operates in noninverted mode, with a logical 1, or mark, state being a high level. For normal RS-232, MAX3100 would interface with the RS-232 line through an inverting RS-232 driver chip.) Here is a simple getting-started demo of some of the main commands required to use the MAX3100. The demo first configures the MAX3100 for 2400 baud using the IrDA timing at the TX and RX pins. It then transmits the quick brown fox jumps over the lazy dog plus a control/line feed (CRLF). Then it goes into a loop to receive data from the IrDA port and print it on the debug screen. If the pushbutton on the above circuit is pressed, the program goes back and transmits the fox and lazy dog phrase again, so long as the pushbutton is down. The RTS line is made high to turn on the red LED when the MAX3100 is transmitting. You can readily change the output text to reflect your application. To use this with an HP200LX, enter the HP COMM program and choose the connect menu. Choose the infrared port and 2400 baud. Now, with the two infrared ports coupled, you should see the fox message printed on the HP screen, and what you type on the HP200LX keyboard should be echoed on the STAMP debug screen. The MAX3100 is one of those IrDA devices that generate an output light flash that is precisely 3 16 of the bit width. And it expects the same for its input. It will reject incoming flashes if they are less than 1 8 of the bit width. That is a problem with some devices that generate a shorter pulse. A pulse stretcher can be added to the circuit for use at a fixed baud rate. There are some peculiarities in the Palm Pilot IrDA implementation. Note that the exact order of the IR commands used to open the IR serial port in NSBASIC makes a considerable difference in successful communication with Palm Pilot devices. Palm users should read the NSBASIC messages in Table 5-1 for additional help.
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