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BitOne wrote: Interesting data from the ER9x implementation.

Extract from the ER9x documentation, page 15 ("PPM In") code.google.com/p/er9x/source/browse/tru...%20Users%20Guide.pdf

This menu allows the PPMin (trainer) inputs to be configured. It enables the RAW PPM inputs to be selected to replace the sticks for training purposes. The student transmitter does not need to have the same model setup as the instructor. All the mixes on the instructors Tx will be applied to the student inputs. If, for example, you have expo on your sticks, this will be applied to the raw trainer inputs when they are selected.

This menu allows the PPMin (trainer) inputs to be configured. It enables the RAW PPM inputs to be selected to replace the sticks for training purposes. The student transmitter does not need to have the same model setup as the instructor. All the mixes on the instructors Tx will be applied to the student inputs. If, for example, you have expo on your sticks, this will be applied to the raw trainer inputs when they are selected.

wuselfuzz wrote: common_devo/ppmin.c:152

    t = (t1>=t0) ? (t1-t0) : (65536+t1-t0);     // none-stop TIM1 counter, compute ppm-signal width (2MHz = 0.5uSecond)

With both t1 and t0 being u16, this can be simplified to

   t = t1-t0;

Adding 65536 to an u16 does absolutely nothing.

SadSack wrote: So head tracker be an option soon, sweet possibly option for 7e(hint)

Some details on how to add it to build would be handy for dim wits like me

Thanks,Phil

static u8 _action_cb(u32 button, u8 flags, void *data)
{
    (void)data;
    if ((flags & BUTTON_PRESS) || (flags & BUTTON_LONGPRESS)) {
        if (CHAN_ButtonIsPressed(button, BUT_EXIT)) {
            PAGE_ChangeByID(PAGEID_MENU, PREVIOUS_ITEM);
        } else {
            if (CHAN_ButtonIsPressed(button, BUT_ENTER)) {
            #ifndef EMULATOR
            // ppm-in
            sprintf(up->tmpstr, "ppm: '%d'-'%d'", 0, 65535),
             GUI_CreateLabelBox(0, 55, 128, 8,&TINY_FONT, NULL, NULL, up->tmpstr);
            ppmin_TIM5_Init();
            ppmin_Init();
            ppmIN = 1;
            }
            if (CHAN_ButtonIsPressed(button, BUT_DOWN)) {
            ppmin_Stop();
            sprintf(up->tmpstr, "ppm#: %d-%d-%d",ppmin_num_channels,ppmChannels[0],ppmChannels[ppmin_num_channels]);
             GUI_CreateLabelBox(0, 55, 128, 8,&TINY_FONT, NULL, NULL, up->tmpstr);
            }
            // ppm-in
            #endif    // #ifndef EMULATOR
            }
        }
    }
    return 1;
}