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[Paparazzi-devel] Fwd: Problems with YAPA2 I2C Port and ETS sensor

From: Jorge Pantoja
Subject: [Paparazzi-devel] Fwd: Problems with YAPA2 I2C Port and ETS sensor
Date: Tue, 25 Jun 2013 11:42:21 -0500

Hello Everyone,
I have been trying to integrate an Eagle Tree Airspeed Sensor to my configuration but I have found a few problems. I hope someone can help me with this problem. Here is what I have:
YAPA2 + GPS + CHIMU on SPI + XBee on Serial + ETS Airspeed Sensor on I2C
When I comment the lines on my airframe file related to my CHIMU, the sensor works perfectly but I don't have any readings from my CHIMU (obviously). It seems like there is a conflict between my SPI and I2C ports, do you have any ideas about how can I solve this problem? My autopilot freezes when I upload a program with the CHIMU lines + the ETS sensor (see the picture attached with this emails). I am using the 4.2 branch version of the Paparazzi.
Best Regards,

---------- Forwarded message ----------
From: Christophe De Wagter <address@hidden>
Date: Mon, Jun 24, 2013 at 5:13 AM
Subject: Re: Problems with YAPA2 I2C Port and ETS sensor
To: GalapagosUAV <address@hidden>

It could be a conflict between spi-slave and i2c low level drivers.

On Jun 21, 2013 10:41 PM, "Jorge Pantoja" <address@hidden> wrote:
Hi Christoph,

Yes, everything stops including telemetry and the leds on the board. The autopilot freezes just like the I show you in the picture below. Do you think this could be a bug or a conflict between the ETS sensor and the CHIMU?

Best Regards,


On 21/06/2013, at 15:04, Christophe De Wagter <address@hidden> wrote:

I do not know anything that would be different between i2c0 and i2c1. 

When you say it freezes, do you know anything more? Does the sys_time led even stop? Does telemetry stop? Does RC stop? 


On Fri, Jun 21, 2013 at 9:50 PM, Jorge Pantoja <address@hidden> wrote:
Hello Christoph,

Thank you for your reply.

I got my Airspeed Sensor working. However, everything is not rainbow colours just yet.

When I uncommented the CHIMU lines I went back to the same problem of the autopilot freezing. It seems like there is a conflict between the Airspeed Sensor being connected to the I2C port and the CHIMU on the SPI (my hypothesis). Then, I changed the code from I2C0 to I2C1 and the board did not freeze but I got nothing from the Airspeed sensor again. Any ideas on how I can solve this?

I am thinking of switching the I2C port to the secondary I2C one shown here ( what do you think? Anyways, shouldn't the ETS Airspeed sensor work on the regular I2C port? Or should I think of changing the port where my CHIMU is?

Best Regards,

Sent from my iPhone

On 21/06/2013, at 14:35, Christophe De Wagter <address@hidden> wrote:


The i2c pullup resistors are not needed for i2c0 on yapa. i2c1 was not designed on yapa but is accessible altough it misses 1 pull-up resistor.



On Wed, Jun 19, 2013 at 5:48 PM, GalapagosUAV <address@hidden> wrote:
Hello Christoph,

I have been trying to get the Eagle Tree Airspeed Sensor V3 to work on the I2C port on the YAPA2 with no luck. I have connected the I2C port as I saw in the pictures of the wiki ( and I am also using external 4.7k pull-ups to get the sensor working. However, I still can't see if the sensor is sending information on the log messages.

Do you have any additional advice that I can use to get the sensor working? 

Best Regards,

Jorge Pantoja
Program Manager/Liaison
Phone: +593-989458127
e-mail: address@hidden

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