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How is the Best way to send "AT" commands from the Propeller to another Chip? — Parallax Forums

How is the Best way to send "AT" commands from the Propeller to another Chip?

John MichaelJohn Michael Posts: 37
edited 2011-02-09 16:55 in Propeller 1
I am new to the Propeller and want to sent "AT" commands from the Propeller to a SIMCOM900 Cellular
Chip. Should I use the Full Duplex Serial object or is their a better way?

Thank you,
John Michael

Comments

  • Mike GreenMike Green Posts: 23,101
    edited 2011-02-09 16:55
    Any of the serial I/O drivers will work. FullDuplexSerial is fine. Simple_Serial should work. The BS2_Functions library should work. FullDuplexSerial is straightforward to use and provides an input buffer.

    Make sure the voltage levels are compatible. The Propeller uses 3.3V logic levels. I/O devices might be 5V or 3.3V or 1.8V or ???. Check the datasheet. You might want to use a 2.2K resistor in series with each of the I/O pins connected to the Cellular Chip. This would protect both devices from programming errors that might cause two pins to both be configured as outputs with opposite states.
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