Subject:
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Sending ir packets
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Newsgroups:
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lugnet.robotics.rcx
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Date:
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Thu, 20 Sep 2001 15:41:00 GMT
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Viewed:
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1594 times
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I am writing a program, and it doesnt work. Right now im just trying to
make sure I can interface with the serial port properly. So I am sending:
55 ff 00 51 ae 03 fc 54 ab
At 2400 baud, 8 data bits, odd parity, and one stop bit.
It doesnt work. The light on the ir tower turns on, but the rcx does
nothing.
When i run "nqc -raw 5103" it works just fine, so its not the rcx or the
tower.
So, my questions are:
1. Is that packet malformed?
2. How does one calculate the checksum?
Thanks,
Trevyn.
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Message has 3 Replies:
 | | Re: Sending ir packets
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| Check the source code for NQC (in rcx/RCX_Link.cpp), or even use it as your underlying comms library. You may spot something Dave does that you don't.. Phil. (...) (23 years ago, 29-Sep-01, to lugnet.robotics.rcx)
| | | Re: Sending ir packets
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| (...) Here ya go: Remember start bit (sometimes called 2 stop bit mode) 55 00 D1 ~D1...Dn ~Dn C ~C Add all the normal D parts in a single Byte for Chksum. Code chunk for example ... unsigned char MuxStr[] ={0x55,0xf7,0x08,0x0...xf8,0x07}; count = 7; (...) (23 years ago, 29-Sep-01, to lugnet.robotics.rcx)
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