Re: [Paparazzi-devel] PPM-sum servo output on Lisa/M

[Felix Ruess]

Hi Alonso,

you are right that there is currently no PPM sum output driver implemented for STM32 (although should not be hard to write one).

But in your case the gimbal might actually work with the dual_pwm driver (since this is nearly the same as a PPM sum signal with only two channels).

So I would give that a try first..

Cheers, Felix

On Fri, Jun 13, 2014 at 7:49 PM, alonso acuña <address@hidden> wrote:

Hi. What I understand from dual pwm is that it works to control a specific type of servo. PPM-sum allows to send values for multiple servos over one wire. The gimbal I want to move has a port which reads ppm-sum signal and controls 2 servos.  So I specifically need ppm-sum. There is already a ppm-sum decoder in paparazzi which reads a signal from a receiver, this is the opposite, a ppm-sum encoder.

On Fri, Jun 13, 2014 at 1:03 AM, karlito <address@hidden> wrote:

I am not certain of what you mean by sending 2 channels, but you got that :

https://wiki.paparazziuav.org/wiki/Subsystem/actuators#Dual_PWM

Sent from my crane.

On 13-06-14 04:09, alonso acuña wrote:

Hello. I am interested in output of PPM-sum to drive gimbal. So the idea is to send 2 channels from paparazzi to the gimbal. I see there is some code already but it appears to work only with LPC21 chips. The corresponding file (servos_ppm_hw.c) seems to be missing from the stm32 folder. 

I couldn't find any documentation on ppm in the actuators page.

Any ideas on how to get this to work?

Thanks

Alonso

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