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2013-12-15
, 21:06
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Posts: 93 |
Thanked: 28 times |
Joined on Jan 2009
@ Germany
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#2
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An FM Transmitter would really rock my commute to work. meanwhile I own an external FM transmitter. However, I wouldn't mind at all to use it for its USB loading port only.
icke
icke
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2013-12-16
, 07:36
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Posts: 3,074 |
Thanked: 12,960 times |
Joined on Mar 2010
@ Sofia,Bulgaria
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#3
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One of the i2c buses in n900 (and I presume in N9/50 too) runs on 2200 KHz, maybe TOH bus can be programmed for such or higher speed. Wild guess only
__________________
Never fear. I is here.
720p video support on N900,SmartReflex on N900,Keyboard and mouse support on N900
Nothing is impossible - Stable thumb2 on n900
Community SSU developer
kernel-power developer and maintainer
Never fear. I is here.
720p video support on N900,SmartReflex on N900,Keyboard and mouse support on N900
Nothing is impossible - Stable thumb2 on n900
Community SSU developer
kernel-power developer and maintainer
| The Following User Says Thank You to freemangordon For This Useful Post: | ||
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2013-12-16
, 09:01
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Posts: 2,021 |
Thanked: 1,060 times |
Joined on Apr 2010
@ Hong Kong
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#4
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Originally Posted by freemangordon
@freemangordon will you use Jolla device? We all need you for kernel power!
One of the i2c buses in n900 (and I presume in N9/50 too) runs on 2200 KHz, maybe TOH bus can be programmed for such or higher speed. Wild guess only
| The Following User Says Thank You to TMavica For This Useful Post: | ||
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2013-12-16
, 09:26
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Posts: 72 |
Thanked: 184 times |
Joined on Apr 2011
@ Germany
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#5
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There's also the possibility to use some kind of audio compression , though it makes things both on the phone side and the other half more complicated.
There's been just the teensy 3.1 released, a tiny board with a 72mhz cortex m4 muC, 64k of ram + 256k flash, has dsp extensions, two i2c busses, spi, can,usb, some adcs and one 12 bit dac, Arduino-compatibility, and below 20 euro. Bit of an overkill just for an fm toh maybe, but could be a nice base for many projects:
www.pjrc.com/teensy/teensy31.html
There's been just the teensy 3.1 released, a tiny board with a 72mhz cortex m4 muC, 64k of ram + 256k flash, has dsp extensions, two i2c busses, spi, can,usb, some adcs and one 12 bit dac, Arduino-compatibility, and below 20 euro. Bit of an overkill just for an fm toh maybe, but could be a nice base for many projects:
www.pjrc.com/teensy/teensy31.html
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2013-12-16
, 17:08
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Posts: 3,074 |
Thanked: 12,960 times |
Joined on Mar 2010
@ Sofia,Bulgaria
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#6
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Originally Posted by TMavica
Not interested as of now. Maybe will rethink if and when Jolla produces a device with HW KBD and FMTX
@freemangordon will you use Jolla device? We all need you for kernel power!
. Till then I'll stick to N/eo900.
__________________
Never fear. I is here.
720p video support on N900,SmartReflex on N900,Keyboard and mouse support on N900
Nothing is impossible - Stable thumb2 on n900
Community SSU developer
kernel-power developer and maintainer
Never fear. I is here.
720p video support on N900,SmartReflex on N900,Keyboard and mouse support on N900
Nothing is impossible - Stable thumb2 on n900
Community SSU developer
kernel-power developer and maintainer
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2014-04-29
, 07:16
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Posts: 86 |
Thanked: 115 times |
Joined on Feb 2014
@ Spain
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#7
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Is there any news about this issue?
For those interested by adding an FM transmitter in an other half, here is something that could help : http://talk.maemo.org/showpost.php?p...&postcount=140
However it can be seen that the chip is controlled by I2C, but the input signals are taken from a jack stereo input. This means, it could only be used by a other half with a cable that connect it to the headphone connector...
Or drive a I2C Digital to analog chip to generate the two channels that are then sampled by the FM transmitter... Not sure if I2C would be the best for that : on at 400kHz bus without any overhead, the theoretical rate of 50 kbytes/s, so for a 8 bits stereo stream a frequency of 25kHz could theotically be reached, and Shannon says it allow to represent at max 12.5kHz signals. Real values would even be a bit lower, so not much quality to expect here... (to compare : CD quality is 16 bits with 48kHz sampling)
Too bad Jolla didn't expose more things to the other half than I2C and power.
If someone wants to work on this, this thread is for him !