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Extend the delay ensure post reset pulse delayed.

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Given the original poster's comment that "It happens very consistently for us." I suspect the motor spin observed in https://github.com/PX4/Firmware/issues/7457 is not caused by the original issue of slow decay on the PWM pins at reset, but the post reset pulse of 3.1 Ms arriving in a window that the ESC considers it valid.

The results from testing, indicated that the if the PWM pins were clamped low for > 300 Ms, prior to reset the motors did not spin. This would delay the the post reset pulse of 3.1 Ms out by > 300 Ms. 

This change delays the reset and therefore the pulse by at least 400 Ms.
This commit is contained in:
David Sidrane 2017-06-29 02:58:22 -10:00 committed by Lorenz Meier
parent 65d8b5c9cd
commit 6eff7deb7e
1 changed files with 1 additions and 1 deletions
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src/drivers/boards/px4fmu-v4/px4fmu_init.c
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@ -179,7 +179,7 @@ __EXPORT void board_on_reset(int status)
*/
if (status >= 0) {
up_mdelay(6);
up_mdelay(400);
}
}