Re: [Paparazzi-devel] Eagletree airspeed sensor problems

[Felix Ruess]

Hi all,

I wasn't fully aware that the ETS airspeed sensor brings the whole bus to a halt.

Unfortunately the protocol and any other possilbe requirements are not really documented.

The only option I see to resolve this is that someone who actually has this sensor sits down with a logic analyser and debugger to figure this out.

For the time being, it seems that the only reliable option is to not use this sensor and switch to a ADC based one.

Cheers, Felix

P.S.  You are right that the second I2C bus is not really an option if you need all the servo ports..

On Sun, Jan 20, 2013 at 1:30 PM, Eduardo lavratti <address@hidden> wrote:

OPss ... i am using MASTER (updated today)

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Date: Sun, 20 Jan 2013 12:08:47 +0100

From: address@hidden
To: address@hidden
Subject: Re: [Paparazzi-devel] Eagletree airspeed sensor problems

Hi,

Again: please report which versions are you using, as this makes a big difference for some of the drivers/subsystems!

The PPM input works fine in v4.2 as well, _but_ the ADC is then sampling very slow as the use the same timer or something like that.

In master this problem should be fixed and PPM input on PA_01 (UART1_RX) _and_ the ADC should be working properly.

Cheers, Felix

On Sun, Jan 20, 2013 at 12:01 PM, Eduardo lavratti <address@hidden> wrote:

Hello Felix, i am using lisa_m 1.0 with PPM input on UART1.
It work fine.

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Date: Sun, 20 Jan 2013 11:12:52 +0100
From: address@hidden

To: address@hidden
Subject: Re: [Paparazzi-devel] Eagletree airspeed sensor problems

Regarding the PPM input on the UART1_RX: it should work in master, would be great if you could test it there...

On Sun, Jan 20, 2013 at 11:06 AM, Felix Ruess <address@hidden> wrote:

Well, what is documented in the manual is for the third party mode (outputs mph or kph), which has to be configured using some eagle-tree windows tool first.

We are using the eagle-tree mode (raw), which is not really documented it seems.

On Sat, Jan 19, 2013 at 12:03 PM, Chris <address@hidden> wrote:

I found this on the airspeed manual"
Here is the pseudo code for accessing the Airspeed and Altimeter sensors:
byte data[2];
signed short reading = 0xFFFF;
i2c_start();
// select sensor in write mode
if (!(i2c_write(SENSOR_ADDRESS | I2C_WRITE_BIT))) {
// send "read data" command to sensor
if (!i2c_write(0x07)) {

>From what i understand in the paparazzi code we are only receiving not transceiving.
  if (airspeed_ets_i2c_trans.status == I2CTransDone)
    I2CReceive(AIRSPEED_ETS_I2C_DEV, airspeed_ets_i2c_trans, AIRSPEED_ETS_ADDR, 2);

Is this correct?

Chris

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