Chapter 14 – Specific AT Commands

Configure LED Indicator +CLED

Description: This command is used to configure GPIO 41 and GPIO 54 for general purpose use. The default use of these two GPIO’s is to drive LED indicators on the Developer Kit board. This command allows a user application to disable this default behavior. When disabled, the user application has full control over the state of these GPIO’s. The modem operating software will be prevented from change them for operational status indications.

The byte value specified with the +CLED command is a bitmap where bit 0 configures LED1/GPIO 41 and bit 1 configures LED2/GPIO 54. Bit positions 2 through 7 are ignored.

The state of the +CLED specified control bits is not persistent. Both bit positions are always set active (1) during boot resulting in LED status indicator operation. The +CLED command must be used by the user application after each boot if GPIO 41 or GPIO 54 are used for other purposes.

Values:

<bitmap value>

 

 

bit 0:

0 = GPIO 41 selected; 1 = LED1 selected.

 

bit 1:

0 = GPIO 54 selected; 1 = LED2 selected.

 

bit 2 – bit7: Reserved

 

Syntax:

Command syntax: AT+CLED=<bitmap value>

 

Command

 

Possible Responses

 

AT+CLED?

 

CLED: 3

 

Note: Display current settings.

OK

 

 

 

Note: Both GPIO’s are used for modem operational

 

 

 

status indicators.

 

AT+CLED=?

 

CLED: (0-3)

 

Note: Display valid parameter range.

OK

 

AT+CLED=1

 

OK

 

Note: Set bit 1 to inactive and bit 0 to

Note: GPIO 54 available, LED1 used for modem

 

active.

 

status.

 

AT+WIOW=54,0

 

OK

 

Note: Set GPIO state.

Note: Set GPIO 54 to 0.

 

AT+WIOR=41

 

+WIOR: 1

 

Note: Read state of LED1 indicator.

OK

 

 

 

Note: Read current state of LED1 indicator

 

AT+CLED=2

 

OK

 

Note: Set bit 1 to active and bit 0 to

Note: LED2 used for modem status, GPIO 41

 

inactive.

 

available.

 

AT+WIOW=41,1

 

OK

 

Note: Set GPIO state.

Note: Set GPIO 41 to 1.

 

AT+WIOW=54,1

 

OK

 

Note: Set LED2 state.

Note: LED2 indicator set to “on”. LED on/off state may

 

 

 

change due to modem status indication.

Multi-Tech Systems, Inc. CDMA Wireless AT Commands - PN S000294C

109

Page 108 Page 110
Page 109
Image 109
Multi-Tech Systems CDMA Wireless Modem Configure LED Indicator +CLED, Values Bitmap value, Bit 2 bit7 Reserved Syntax
Page 108 Page 110
Top Page Image Contents