Siemens AC75 Gpio Commands, Atspio General Purpose IO Driver Open/Close, Atspio=?, ATSPIO=mode

AC75 AT Command Set

20. GPIO Commands

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20.GPIO Commands

This chapter describes the AT commands needed to access and configure the GPIO pins of the AC75.

Please also refer to [2] for electrical specifications of the GPIOs and their signal states after startup and during application.

Except for the pulse counter commands, usage of all GPIO commands is restricted to the same interface where the GPIO driver was openend with AT^SPIO. Any attempt to access GPIOs from another interface will be denied with an error message.

When the AC75 starts up, all GPIO pins are set to high-impedance state after initializing. Therefore, it is recom- mended to connect pull-up or pull-down resistors to all GPIO pins you want to use as output. This is necessary to keep these pins from floating or driving any external devices before all settings are done by AT command (at least AT^SPIO, AT^SCPIN), and after closing the GPIOs again.

20.1AT^SPIO General Purpose IO Driver Open/Close

The AT^SPIO write command opens and closes the general purpose IO driver. The command must be executed before any other GPIO command can be used. After closing the driver, all pins used (i.e. opened) will be put into high impedance state (inputs) with no internal pull up or down.

The command does not reserve any general purpose IO pin, only the drivers required for GPIO pin management will be loaded.

Syntax

Test Command

AT^SPIO=?

Response(s)

^SPIO:(list of supported <mode>s)

OK

Write Command

AT^SPIO=<mode>

Response(s)

OK ERROR

+CME ERROR: <err>

Reference(s)

SIEMENS

PIN ASC0 ASC1 USB MUX1 MUX2 MUX3 Charge 4 Last

- + + + + + + - + -

Parameter Description

<mode>(num)

0	Close General purpose IO driver
1	Open General purpose IO driver

AC75_ATC_V01.002	Page 508 of 569	10/30/06
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