|Subject:||Re: [Paparazzi-devel] simultaneously using two autopilot systems for reliability|
|Date:||Mon, 25 Nov 2013 20:36:39 +0200|
Chris, I observed that when the modem tx power is above 25mW, then the voltage of modem drops to 4V. Thanks for warning. We will give the voltage from a different supply.
Michal, I was not aware of I2C issue. We are using airspeed and temperature sensors connected to I2C. It seems that the I2C issue is a serious problem.
We bought a BlackMagic probe and today we start working on debugging. We tried to upload using JTAG cable, but it always gives an error that it can not erase the flash when we upload from GCS. When we upload from terminal, it usually uploads successfully and sometimes it gives the same error.
We want to have a very reliable system which can work for hours. I am planning to use a second autopilot which does not have any peripheral. It will be connected only to GPS, and maybe to modem also. It will always be on standby mode. I ordered an FPGA board. If it works porperly, I hope that the system will be more reliable. And I understand that using a watchdog timer outside of the microcontroller will be better. I am planning to use the FPGA for that purpose.
Do you have recommendations about the connection of the second autopilot?
1. We can add the second autopilot with a second modem using API mode and the GCS will see the two autopilots as 2 different airplanes.
2. We can add only one modem and both of the autopilots will receive same commands from GCS, but only one of them transmits data to GCS.
3. The second autopilot will not have a modem. It will always be on standby mode. If the primary autopilot will freeze, the second autopilot will bring the plane to the standby.
since you mentioned using I2C, look at the pending issue with I2C causing the autopilot to freeze (https://github.com/paparazzi/paparazzi/pull/531). What happens if you disable the I2C sensor, does it still hang?
Also, do you have a debugger (http://paparazzi.enac.fr/wiki/JTAG)? That would be probably the easiest way to find what happened.
On Mon, Nov 25, 2013 at 9:40 AM, Eduardo lavratti <address@hidden> wrote:
When i do the first test with mine lisa_m it reset or hang.
Although we do not give power to the Ets in the upload, its 7 segment display works and blinks. I think that it takes power from I2C pins. Does it create a problem in the upload?
I don't know. Can you remove everything then add them back one by one, testing in between? That's software-guy thinking, maybe a hardware person has a more informed idea...
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