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Subject: Re: Feature proposal: received signal strength indicator for fm radio

Re: Feature proposal: received signal strength indicator for fm radio

From: Bertrik Sikken <>
Date: Mon, 25 Oct 2010 22:48:21 +0200

On 25-10-2010 8:31, Marcin Bukat wrote:
> 2010/10/24 Bertrik Sikken <>:
>> Hi all,
>> I'd like to propose a new feature:
>> received signal strength indication (RSSI) for fm radio
>> This makes it possible to show an indication of the radio signal
>> strength in the FMS in two ways:
>> * as a number (in the logarithmic unit dB microvolts, or dBuV)
>> * as a graphic, for example a little antenna with a variable number
>> of bars next to it (similar to how we show volume).
>> This will need several steps to be done:
>> 1) add support in the fm tuner drivers that can do this
>> 2) create new tags for this, add code to parse and render the tags
>> 3) create a WPS + RSSI graphic that actually uses the new tags
>> Step 1) is mostly done now, see
>> Nearly all fm tuner chips support RSSI, except for the s1a0903x01.
>> The TEA5760 and TEA5767 support it, but update it only when changing
>> channel. The RSSI value is retrieved with tuner_get(RADIO_RSSI),
>> possible tuner-specific minimum and maximum RSSI values are #defined
>> and accessible through tuner.h
>> Steps 2) and 3) are yet to be done.
>> Please let me know what you think.
> I am all for this.
> How do You want to handle TEA chips?

Simply a best effort approach, so have it update only on station
switches if that's all the TEA hardware supports.

Received on 2010-10-25

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