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Re: [Paparazzi-devel] Futaba SBUS through R/C connector on Umarim

From: Joseph Muhlhausen
Subject: Re: [Paparazzi-devel] Futaba SBUS through R/C connector on Umarim
Date: Sun, 14 Jun 2015 09:00:49 -0400

Hi Gautier Thanks this is very useful. I had not thought about the interrupts.

I did a little bit more research:
- There is a SBUS to CPPM from Frsky which I tested. It works well but it becomes an anagogic signal and the SBUS SIGNAL_LOST bit is not carried through.

- I can use a Lisa M2 (easier to find) with an inverter.

- I could write a SBUS serial driver for I2C? (I am not sure about this one).

How difficult would it be to write and SPI driver for xbee? 


On Sun, Jun 14, 2015 at 4:23 AM, Gautier Hattenberger <address@hidden> wrote:

If plan to use an UART input for SBUS, you'll also need to invert the signal (the SBUS signal is not a standard serial: different idle level, unusual baud rate), and as you figured it, there is only two UART on Umarim board. An no easy solution:
- fix the gps-i2c driver if you are using an ublox gps.
- implement gpio based (probably better use the input capture pin (PPM)) to read the signal by hand (benefit is that you don't need the inverter, but it will generate a lot of interrupts).
- write an spi driver for XBee.
- use an Apogee board (unfortunately a bit difficult to find these days... ).


Le 13/06/2015 23:58, Joseph Muhlhausen a écrit :
According to the data sheet for NXP LPC2148 there are only two UART available. I wonder if there is a way to connect it via SPI or IC2.

On Thu, Jun 11, 2015 at 2:09 PM, Joseph Muhlhausen <address@hidden> wrote:
I am switching to a futaba sbus system and it looks like both UART port are occupied by an xbee and a GPS on Umarim lite 2.0. 

Can I read the sbus signal via the PPM pin on Umarim?
Or can I use a GPIO pin instead?


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