Re: [Paparazzi-devel] Eagle Tree airspeed sensor startup testers needed

[Stephen Dwyer]

Hello,

Sorry, I should have mentioned, yes I was using a logic analyzer
(Saleae Logic16), so it is easy to see what is going on. Fantastically
useful piece of test equipment :)

Another interesting point is that when it wasn't working at all, there
was no traffic on the I2C bus. It was totally dead. I don't have
enough I2C experience at this point (or time to learn unfortunately)
to continue debugging right now. If I get a chance perhaps I can look
again.

Thanks,
-Stephen Dwyer



On Sun, Oct 7, 2012 at 12:08 PM, Eduardo lavratti <address@hidden> wrote:
> Hello Stephen,
> first of all , how you see tha NACK's in transactions ?
> are you using logic analyzer ?
>
> This is the code i modified in airspeed_Adc.c
> as you can see, this is ridiculous but work fine for me.
>
>
> void airspeed_ets_init( void ) {
>   int n;
>   airspeed_ets_raw = 0;
>   airspeed_ets = 0.0;
>   airspeed_ets_offset = 0;
>   airspeed_ets_offset_tmp = 0;
>   airspeed_ets_i2c_done = TRUE;
>   airspeed_ets_valid = TRUE;
>   airspeed_ets_offset_init = FALSE;
>   airspeed_ets_cnt = AIRSPEED_ETS_OFFSET_NBSAMPLES_INIT +
> AIRSPEED_ETS_OFFSET_NBSAMPLES_AVRG;
>
> //#if ! defined SITL
>   airspeed_ets_delay_done = FALSE;
>   SysTimeTimerStart(airspeed_ets_delay_time);
> //#else
> //  airspeed_ets_delay_done = TRUE;
> //  airspeed_ets_delay_time = 0;
> //#endif
>
> //#ifndef SITL
>   for (n=0; n < 60000; ++n){
>   LED_ON(1)
>   LED_OFF(1)}
>  //
>  // if (!airspeed_ets_delay_done) {
>  //   if (SysTimeTimer(airspeed_ets_delay_time) < USEC_OF_SEC(1)) return;
>  //   else airspeed_ets_delay_done = TRUE;
>  // }
> //#endif
>   airspeed_ets_buffer_idx = 0;
>   for (n=0; n < AIRSPEED_ETS_NBSAMPLES_AVRG; ++n)
>     airspeed_ets_buffer[n] = 0.0;
>
>   airspeed_ets_i2c_trans.status = I2CTransDone;
> }
>
>
>
>> Date: Sun, 7 Oct 2012 14:41:06 +0100
>> From: address@hidden
>> To: address@hidden
>
>> Subject: Re: [Paparazzi-devel] Eagle Tree airspeed sensor startup testers
>> needed
>>
>> On 05/10/12 21:31, Stephen Dwyer wrote:
>> > Hello,
>> >
>> > I tried this out, and it was only working after a luftboot upload, not
>> > after a regular bootup sequence. It was on a Lisa/M v2.0, nothing else
>> > connected but UART2, on the Bixler example airframe, with the sensor
>> > connected to I2C2. When it was working, it wasn't overly reliable,
>> > with a considerable number of NACKed bytes in the transactions. The
>> > same results occurred with a delay of 2sec or 8sec.
>> >
>>
>> How do you see that? I only rely on the observation that the airspeed is
>> not constant to tell if it worked.
>>
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>
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