Part 5 – GPIO AT Commands

Chapter 15 – GPIO AT Commands

Chapter 15 – GPIO AT Commands

About GPIO

If the specific hardware allows GPIO (check availability with AT#GPIO=1), then you may specify certain external events from the GPIOs to trigger specific stack functions; i.e., email, upload files, download files. In order for this to work, you must configure the specific function first. For instance, if SENDMAIL1 will be called, then all settings pertaining to SENDMAIL1 must be configured before the #GPIO command is configured.

Note:

MultiModem iCell: The MultiModem iCell allows for the following GPIO IDs and GPIO function combinations:

GPIO 1 - 2:

GPIO function 0 may be selected

GPIO 3 - 4:

GPIO functions 0, 1, 2 and 3 may be selected

GPIO 5:

GPIO function 3 may be selected

SocketModem iCell: The SocketModem iCell allows for the following GPIO IDs and GPIO function combinations: GPIO 1 - 2: GPIO function 0 may be selected

GPIO 3 - 4: GPIO functions 0, 1, 2 and 3 may be selected

GPIO 5: GPIO 5 is non-functional

#GPIO – Enable/Disable and Configure External GPIO Driven Events

Description: If GPIO is enabled and configured correctly, a specific external trigger (Digital HI/LOW or Analog value from 0-3.3V) will trigger a specified function from the stack.

Syntax:

AT#GPIO=ID, GPIO Function, Trigger Level, Debounce, Stack Function, Hangup

 

AT#GPIO=<n> where n is the GPIO number or AT#VALL

ID:

GPIO number as described in the hardware documentation

Values:

1

- 5

GPIO Function:

Allows the GPIO to be a Digital Input, Digital Output or ADC input

Values:

0

- Digital Input without internal pullup

 

1

- Digital Input with internal pullup

 

2

- Digital Output

 

3

- ADC input

Trigger Level:

The Voltage level at which GPIO will trigger.

 

For Digital input, a value greater than 0 indicates high. 0 indicates low.

 

For Digital output, a positive value will drive the line high. A zero value will drive the line low.

Values:

For ADC input, the trigger value will be in the range of 0 to 3300 millivolts.

0

- 3300 in milliVolts

Debounce:

The time between successive reads on the GPIO.

Values:

0

- 65535 milliseconds

Stack Function: The desired stack function to be specified on a GPIO trigger. The stack function must be properly configured; i.e., for a sendmail function, all proper sendmail items must be configured.

Values: 0 - Disabled (The GPIO will not trigger) 1 - #SENDMAIL1

2 - #SENDMAIL2

3 - #SENDMAIL3

4 - #PUTMAIL

5 - #GETMAIL

6 - #LTCPSTART=1

7 - #OTCP=1

8 - #OUDP=1

9 - #LUDPSTART=1

Universal IP AT Commands Reference Guide (Document S000457K)

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Multi-Tech Systems iCell GPRS (MTSMC-G2-IP Gpio AT Commands, About Gpio, Values Gpio Function, Trigger Level, Debounce
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iCell GPRS (MTSMC-G2-IP specifications

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