Eflite RC: Difference between revisions
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(Created page with ' <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 s…') |
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Latest revision as of 02:07, 19 November 2010
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 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!