ArduPilot Mega (red PCB) with blank Atmega 328p MCU - can't make PPM encoder work

Hello,

 I have ArduPilot Mega (red PCB) with blank Atmega 328p MCU and can't make PPM encoder work.

1. Got latest sources from GIT
2. Build firmware
3. got ardupilot_mega\ardupilot-mega\Tools\ArduPPM\ATMega328p\Encoder-PPM.hex file
4. flashed this firmware using command avrdude -e -c stk500v2 -p m328p -P com4  -U flash:w:Encoder-PPM.hex  -U efuse:w:0xF4:m -U hfuse:w:0xD9:m -U lfuse:w:0xFF:m  -U lock:w:0x0F:m)
5. I have 16MHz signal on oscillator, and blue LED is slowly blinking (So MCU works and fuses seem to be OK)
6. I have connected RX to all 8 input lines
7. Connected to PC using FTDI cable (power comes from this cable) - Sensor board is disconnected.
8. Checked signal on Input lines - 5V. Looks good to me.

Problem is - ArdupilotMegaPlanner connects to board, but reads no signal from RC receiver.

Any ideas?

Views: 708

▶ Reply to This

Replies to This Discussion


DeveloperPermalink Reply by Andreas M. Antonopoulos on April 4, 2012 at 12:01am

I fear that question is best answered by a comparison test with a new red board. I'm on red board #4 (my mistakes). 

I remember reading in the wiki that input 8 should not be connected, except for a special mode or something. 

Not sure if that is relevant, but I thought, I'd offer a suggestion. If I find it I will comment with a link

Permalink Reply by Saulius L. on April 4, 2012 at 12:03am

I did not mentioned, but I tested with and without 8'th pin. It makes no difference.

Permalink Reply by Saulius L. on April 4, 2012 at 7:12am

Andreas, do you have ability to read firmware from mega328p?

Permalink Reply by Dave on April 4, 2012 at 5:33am

How are you powering the board?  I think the USB power does not power the Rx as standard. 

You might want to look at this mod: http://diydrones.com/profiles/blogs/simple-apm-2560-power-hack

Permalink Reply by Saulius L. on April 4, 2012 at 7:08am

Receiver is powered via 5V power supply. If I connect servo motor it is controlled via RC transmitter as should.

Permalink Reply by Saulius L. on April 4, 2012 at 7:55am

Today with fresh head, I found solution. There is confusion with programming fuses.

avrdude -e -c stk500v2 -p m328p -P com4 -U lock:w:0xFF:m
avrdude -e -c stk500v2 -p m328p -P com4 -U hfuse:w:0xDF:m -U lfuse:w:0xFF:m -U efuse:w:0xFE:m
avrdude -e -c stk500v2 -p m328p -P com4 -U flash:w:Encoder-PPM.hex  -- started to work!
avrdude -e -c stk500v2 -p m328p -P com4 -U lock:w:0xCF:m -- after this line MCU stops responding (flashing)

Permalink Reply by Umer on April 19, 2012 at 8:17pm

Saulius i got the same problem, only difference i got it as a consequence when my Xbee 2.4 onboard failed, I think it got shorted (with no human error apparently), momentarily drained the Lipo, i landed arducopter and when i took a deeper look at the APM1.4 red pcb, a trace was fried , i jumpered it, but since the day i am unable to read RC signals. Also Atmega 328p is getting darn hot. Unable to solve the problem, gonna RMA it. But still the big question is WHAT ALL WENT WRONG??

Permalink Reply by Saulius L. on April 19, 2012 at 9:08pm

Hi Umer, your problem is completely different from mine but you should upload a photo indicating which track was fried and your setup. It would help a bit.

Permalink Reply by Umer on April 19, 2012 at 10:58pm

Were u able to make ur ppm encoder 328 work?

Besides the only led thats On is the pwr

Permalink Reply by Saulius L. on April 19, 2012 at 11:07pm

You should try flashing firmware using SPI programmer to see if Mega328p is alive.

Permalink Reply by Umer on April 20, 2012 at 1:25am

I tried Programming the Atmega328p (PPM encoder/failsafe) using AVR ISP MKII programmer,

Downloaded ATMega328p ppm encoder fimrware v0.9.87 for APMv1.0 / APMv1.4.

Renamed the file as firmware.hex and replaced it with firmware.hex in PPM_Encoder.hex ( i have also tried with the original firmware.hex. SAME ISSUE AS DISCUSSED BELOW)

Now when i run the firmware_arduino_328_16mhz.bat file

i get the following message:The led status on apm:Any clues why it is not entering programming mode?

Permalink Reply by Saulius L. on April 20, 2012 at 1:27pm

Probably you have killed MCU.

RSS

Social Networking

Top Content 

1 Mapping Mission Ride Along

Mapping Mission Ride Along
2 APM 2.5 from hobbyking

APM 2.5 from hobbyking
3 Alt_hold and loiter acting crazy

Alt_hold and loiter acting crazy
4 Looking for best laptop screen to see in the sun

Looking for best laptop screen to see in the sun
5 ArduPlane 2.73 released

ArduPlane 2.73 released
6 Mechanical Hands From A MakerBot: The Magic Of Robohand (From Makerbot blog news)

Mechanical Hands From A MakerBot: The Magic Of Robohand (From Makerbot blog news)
7 3 axis Camera Gimble connections.

3 axis Camera Gimble connections.
8 New micro-cameras emulate insects' compound eyes

New micro-cameras emulate insects' compound eyes
9 APM Copter 2.9.1.b has been released

APM Copter 2.9.1.b has been released
10 Thirty Days (#17): 12-rotor close up

Thirty Days (#17): 12-rotor close up

Contests

Season Two of the Trust Time Trial (T3) Contest has now begun. The fourth round is an accuracy round for multicopters, which requires contestants to fly a cube. The deadline is April 14th.

A list of all T3 contests is here. 

Groups

Advertisement

© 2013   Created by Chris Anderson.   Powered by

Badges  |  Report an Issue  |  Terms of Service