Omnibus PWM 5 and 6

Farin · April 2, 2019, 6:19pm

Hi everyone,

I was trying to use pwm 5 and 6 on the omnibus f4pro.
This should be pretty straight forward using the aux 1 and aux 2 chanels, however things are not working.
I took a lok at the firmware and found in

github.com

PX4/PX4-Autopilot/blob/master/boards/omnibus/f4sd/src/board_config.h

/****************************************************************************
 *
 *   Copyright (c) 2018, 2014 PX4 Development Team. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name PX4 nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

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and

github.com

PX4/PX4-Autopilot/blob/master/boards/omnibus/f4sd/src/init.c

/****************************************************************************
 *
 *   Copyright (c) 2012-2018 PX4 Development Team. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name PX4 nor the names of its contributors may be
 *    used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT

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that only 4 pwm signals are configured.
Uncommenting the lines relative to pwm 4 and 5 didn’t work. I could build and flash the firmware, but still no signal on those ports.
I don’t know much on PX4, so was wondering if anyone has an idea on how I can get this to work.

Cheers,

Andre

JulianOes · April 4, 2019, 2:30pm

I’m going to ping @bkueng hoping that he might have an idea.

bkueng · April 5, 2019, 9:22am

It needs a bit more, but w/o digging into it myself, I cannot tell you what exactly.
One thing I can say is that RX of UART4 is configured on PWM 5, so you will have to disable that UART.

Farin · April 5, 2019, 10:38am

Hi,

Thanks for the hint.

I’ll let you know how it goes.

MatixYo · May 22, 2021, 9:28am

Hi,
It’s an old topic but is still an issue. Did you fix it? Is it possible to enable PWM 5 & 6 without compiling source code?