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Telit TRIZIUM Product Description

80264ST10007a Rev. 4– 09/09/04

5.6.1.16 #GPIO –General Purpose Input/Output pin control

#GPIO –General Purpose Input/Output pin control

Execute command

Read command

AT#GPIO=<pin>,2

Reports the read value for the pin GPIO<pin> in the format:

#GPIO: <dir>,<stat>

where

<dir> - current direction setting for the GPIO<pin>

<stat> - logic value read from pin GPIO<pin> in the case the pin

<dir> is set to input;

- logic value present in output of the pin GPIO<pin> in the case

the pin <dir> is currently set to output;

- no meaning value for the pin GPIO<pin> in the case

the pin <dir> is set to alternate function;

Note for GPIO1: Since the reading is done after the insulating transistor, the reported

value is the opposite of the logic status of the GPIO1 input pin.

Write command

AT#GPIO =<pin>,

Sets the value of the general purpose output pin GPIO<pin> according to <dir> and

<mode> parameter.

Not all configuration for the three parameters are valid.

Parameter:

<pin> - GPIO pin number

supported range is from 1 to 7, but GPIO1 is input only and GPIO2

is output only.

<dir> - GPIO pin direction

0 - pin direction in INPUT

1 - pin direction is OUTPUT

2 - pin direction is ALTERNATE FUNCTION *see Note

<mode> - its meaning depends on <dir> setting:

0 - no meaning if <dir> = 0 - INPUT

- output pin cleared to 0 (LOW) if <dir> = 1 - OUTPUT

- no meaning if <dir> = 2 - ALTERNATE FUNCTION

1 - no meaning if <dir> = 0 - INPUT

- output pin set to 1 (HIGH) if <dir> = 1 - OUTPUT

- no meaning if <dir> = 2 - ALTERNATE FUNCTION

2 - Reports the read value from the input pin (see Read command) if <dir> = 0 -

INPUT

- Reports the read value from the input pin (see Read command) if <dir> = 1 -

OUTPUT

- Reports a no meaning value (see Read command) if <dir> = 2 - ALTERNATE

FUNCTION

Note: "ALTERNATE FUNCTION" value is valid only for pins

GPIO6 - alternate function is "Alarm Output" (see command +CALA)

GPIO7 - alternate function is "Buzzer Output" (see command #SRP)

While using the pins in the alternate function, the GPIO read/write access to that pin

is not accessible and shall be avoided.

Note: The GPIO2 is an OPEN COLLECTOR output, the command sets the transistor

base level, hence the open collector output is negated

Test command

AT#GPIO=?