Blade MLP4DSM RC: Difference between revisions

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'' http://www.rcgroups.com/forums/showthread.php?t=721024&highlight=thesteve ''
'' http://www.rcgroups.com/forums/showthread.php?t=721024&highlight=thesteve ''


<pre>
Decided to play with this a little more this evening and everything fell into place.
I tried a serial port rate of 125K instead of 115200. The data is now super easy to see and follow.


The radio transmits 14 bytes per frame, 6 channels of information, 2 header bytes. Data rate is 125K 8,N,1
Blade MLP4DSM RC uses a 4.194M crystal
 
More info to come
Each frame begins with 00 00
 
Each pair of bytes after that represent the channel and its value. Each channel has a valid range(1024 steps - 10 bit), the channel number is embedded in each pair of bytes.
The radio transmits a 6th channel which is a copy of channel 1 with its endpoints limited. This appears to simply be a function of the radio when in airplane mode, channel 6 is still a full 10 bit channel.
 
Here is a breakdown of the min and max values for each channel and the valid 10 bit range for each channel.
 
ch1(left stick, up/down)
bytes 3&4
0056-03AA -measured min/max
10 bit range - 000-3FF
 
ch2(right stick, left/right)
bytes 5&6
0455-07A9 - measured min/max
10 bit range - 400-7FF
 
ch3(right stick, up/down)
bytes 7&8
0855-0BA9 - measured min/max
10 bit range - 800-BFF
 
ch4(left stick, right/left)
bytes 9&10
0C56-0FAA - measured min/max
10 bit range - C00-FFF
 
ch5(knob, upper right)
bytes 11&12
1056-13AA - measured min/max
10 bit range - 1000-13FF
 
ch6(copy of throttle channel) - travel limited
bytes 13&14
152A-162A - measured min/max
10 bit range - 1400-17FF
 
Channel breakdown:
 
First two bits are 00
Next four bits indicate channel #
remaining 10 bits are serial values for the PPM data
 
00 00 00 xx xx xx xx xx - ch1 0000-03FF
 
00 00 01 xx xx xx xx xx - ch2 0400-07FF
 
00 00 10 xx xx xx xx xx - ch3 0800-0BFF
 
00 00 11 xx xx xx xx xx - ch4 0C00-0FFF
 
00 01 00 xx xx xx xx xx - ch5 1000-13FF
 
00 01 01 xx xx xx xx xx - ch6 1400-17FF
 
If supported by DSM2 low power module:
 
00 01 10 xx xx xx xx xx - ch7 1800-1BFF
 
00 01 11 xx xx xx xx xx - ch8 1C00-1FFF
 
So there it is, using the above data its now possible to build a 6 channel PPM to serial encoder to interface to the DSM2 module from the LP5DSM radio.
 
 
Questions or comments let me know!
</pre>




Revision as of 02:04, 19 November 2010

This RC wireless device uses a spektrum DSM2 transmitter chip

http://www.rcgroups.com/forums/showthread.php?t=721024&highlight=thesteve


Blade MLP4DSM RC uses a 4.194M crystal More info to come


btw, Using Saleae usb logic analyzer to look at the frames from the atmega88 on the blade's main pcb very nice

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