Re: [Paparazzi-devel] CANbus driver

[Piotr Esden-Tempski]

Did you check that the RS resistor is there and correctly set on your Lisa/M? 
Meaning the R56 should not be on the board and R55 should be jumped (can be a 
blob of solder) to ground.

Cheers Piotr

On Jan 30, 2013, at 1:49 AM, Miguel Torres <address@hidden> wrote:

> I'm starting to work with CAN bus, so right now I'm just playing with bit 
> timing and sending dummy messages to test all nodes. I have 3 nodes 
> connected: one Lisa/M, one LPCXpresso board (LPC11C24 MCU with integrated can 
> controller and transceiver) and one microchip can bus analyzer. I will add 
> the ESC32 once I got the can transceiver mounted on it.
> 
> To start with, i would like to have the existing driver code up and running. 
> It looks like a simple driver but as far as it seems it should work. Once the 
> basic communications are working I will focus on the communications protocol 
> and messages. I'm not sure if it's a good idea to continue with the actual 
> driver or if it's better to redesign a new one. At least the CAN bus timing 
> settings should be configurable by the user.
> 
> Regarding the tests, I've got the LPCXpresso and the can bus analyzer send 
> and receive messages, but with Lisa/M I haven't managed to perform any 
> communication at all. I've tried with different bitrates but without luck. I 
> don't have a jtag debugger so I'm only sending some telemetry messages and 
> blinking some leds for debugging. I am using master branch and fixedwing 
> firmware. Searching for can bus in the paparazzi code I only found the "Beth" 
> airframe to work with canbus, and since it's a custom code for a bench test, 
> I am wondering if the can bus driver conficts with other elements of the 
> fixedwing firmare. I have written a small module to test the canbus driver 
> that periodically sends a message, and also i have written a receive callback 
> to "echo" the received messages back.
> 
> Regards
> 
> Miguel.
> 
> 
> 
> __________________________________________________________________________________________________
> 
> Miquel Ángel Torres Gil
> Instituto Tecnológico y de Energías Renovables, S.A. (ITER, S.A.)
> Polígono Industrial de Granadilla, s/n 38600 - Granadilla de AbonaSanta Cruz 
> de Tenerife - España (Spain)
> TEL: + 34 922-747-700; FAX: +34 922-747-701
> 
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