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» PIC Interfaces

To enable your PIC microcontroller to transmit or receive data between a Palm running SirPic, requires an interface. The interface is connected via input and output pins from your PIC device.

SirPic supports four types of interfaces:
  • IrTx : Wireless Raw Infra red transmitter
  • SIrTx : Wireless Serial to Infra red converter and transmitter
  • SerialPIC : Wired Serial RS232 bi-directional interface
  • InfraPIC : Wireless Infra red bi-directional interface

    Full construction details for all these interfaces can be found in the SirPic Interface Guide.

    IrTx for PIC Assembler programmers

    16f628

    The IrTx interface is a raw infra red transmitter, targeted at PIC Assembler developers who wish to use the SirPic API assembler subroutine for transmitting infra red data.

    SIrTx for PIC BASIC programmers

    16f628

    The SIrTx interface comprises of the above IrTx interface with a preliminary "bolt-on" serial to infra red converter, with the following advantages:
  • PIC BASIC developers can use the standard SEROUT command to transmit infra-red data from any PIC output pin.
  • PIC developers who have an existing wired PIC serial output data stream (9600 & 19200 baud) can go "wireless" with NO PIC code modification.
  • PIC developers can save on valuable CPU cycles, by using the PICs onboard hardware UART (as provided by 16F628) to transmit infra red data concurrently in the background.
  • Infra red LEDS are protected from the damaging effects of prolonged constant "on" voltage, extending the component life.

    SerialPIC wired RS232 interface

    16f628 16f628

    The SerialPIC interface is a two way serial TTL to RS232 voltage level converter. This uses the popular MAX232 IC to convert TTL levels (0 and +5V) to RS232 levels (+10 and -10V) and vice-a-versa.

    The SerialPIC interface:
  • Allows simple bi-directional data transfer (transmit and receive)
  • Allows PIC developers to save on valuable CPU cycles, by using the PICs onboard hardware USART (as provided by 16F628) to transmit/receive serial data concurrently in the background.
  • Can be used to communicate directly to a PDA or PC equipped with a serial RS232 port. Supports direct connection of the Palm HotSync serial cable (or other NULL modem cable), as well as straight serial cables for connection to a PC or laptop.
  • Conforms to RS232 voltage specifications.
  • SirPic API also supports the bit-bang method for PICs, which do not have onboard USARTs. The bit bang method produces a True mode bit patterns, as produced by the PIC USART
  • Can be used by PIC Basic programmers for True mode output (eg T9600).
  • Enables use of third party data loggers or terminal emulation software, as well as SirPic for data logging.

    InfraPIC interface

    16f628 16f628

    The InfraPIC interface is a bi-directional serial TTL to Infra-red pulse shape converter. The InfraPIC interface unit converts infra-red input/output signals to TTL, using the custom PSXIR bi-directional converter.

    The InfraPIC interface:
  • Allows simple bi-directional (transmit and receive) half-duplex data transfer at 9600 baud (modes: 8N1, 7E1, 7O1).
  • Can be used to communicate directly to a PDA or PC equipped with an infra-red port, and able to receive/transmit raw IrDa (SIR) data.
  • Suitable for both PIC BASIC and PIC Assembler developers. Can use standard Bit-bang/USART/SERIN/SEROUT techniquess to transmit and receive data.
  • PIC developers to save on valuable CPU cycles, by using the PICs onboard hardware USART to transmit/receive serial data concurrently in the background.
  • Can be used by PIC Basic programmers for True mode input/output.
  • Low component count and compact footprint.