Using The Integra Wireless Cpu; Firmware Upgrade; Nominal Upgrade Procedure; Alternative Procedure - Wavecom Integra M2106+ Product Specification

6 Using the Integra Wireless CPU

6.1

Firmware Upgrade

The Integra firmware is stored in flash memory and can easily be upgraded.
The upgrade procedure is based on the X-modem protocol, but an emergency mode (backup procedure)
based on a Wavecom specific downloader is also available.
6.1.1

Nominal Upgrade Procedure

The firmware file can be downloaded to the Wireless CPU
To enter this mode, the AT+WDWL command (see description in the AT command Interface Guide
documentation [7]) must be sent to the Wireless CPU
The serial signals required to proceed with X-modem downloading are:
Rx, Tx, RTS, CTS and GND.
6.1.2

Alternative Procedure

If nominal upgrade mode cannot be used (due to critical corruption on the flash memory), an alternative
procedure is available. This procedure requires Wavecom specific software to download the firmware file to
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the Wireless CPU .
This tool must be run on a PC connected to the Wireless CPU
and required Wavecom tools, the process must be executed by your distributor.
The signals required to proceed with downloading are: Rx, Tx, RTS, CTS and GND.
Prior to running the Wavecom downloader, set the Wireless CPU
be set to low while powering ON (or resetting) the Wireless CPU
The application must support serial speed changes of up to 115,200 bps and hardware flow control
(RTS/CTS connected).
6.2

Guidelines for Application Design

6.2.1

Hardware Recommendations

When designing the application board, specific attention must be paid to the following points:
• Having a common ground plane for analog, digital and RF grounds
• Length of the SIM interface lines: 10 cm maximum
• Bias of the Microphone inputs properly adjusted when using audio connectors (microphone + speaker)
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• EMC protection on audio input/output (filters against 900 MHz)
• ESD protection on the serial link
• Avoid placing application processor or local oscillator circuits near the Wireless CPU
cable, in order to avoid any spurious emissions from the application
• Avoid placing the audio interface near the application antenna to reduce the risks of TDMA noise on
the audio
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WA_DEV_M2106+_PTS_003-001
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using the X-modem protocol.
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.
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serial bus. As this procedure is highly specific
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to download mode: the BOOT signal must
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.
Integra M2106+
Using the Integra Wireless CPU
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or the antenna
Page: 58 / 77
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April, 2007