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

From: Gautier Hattenberger
Subject: Re: [Paparazzi-devel] Futaba SBUS through R/C connector on Umarim
Date: Sun, 14 Jun 2015 10:23:17 +0200
User-agent: Mozilla/5.0 (X11; Linux i686; rv:31.0) Gecko/20100101 Thunderbird/31.7.0


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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