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[Paparazzi-devel] Tiny13 1.1 / Servo Output

From: Matthew Currie
Subject: [Paparazzi-devel] Tiny13 1.1 / Servo Output
Date: Mon, 28 Jan 2008 16:35:19 -0800
User-agent: Thunderbird (Windows/20071031)


I have been diagnosing my servo output problem on my Tiny13 1.1 for some time now. I put the Tiny13 under a 20-400x digital microscope and verified that all the crucial solder joints are great. I currently have the Tiny13 under a DSO and now see that SERV_CLK is sending what looks like a reasonable clock, the SERV_RESET is sending a signal, but the SERV_DATA line is being held at VCC with no PPM signal present. This now explains why my servos were moving to extremes and binding the control surfaces. I checked the SERV_DATA line all the way to the LPC pin and verified it is held high there. Is there something obvious I am missing? Is this a symptom of a software misconfiguration? Did anything change between Tiny13 and Tiny2 and maybe I have a bit of code crossed over? Thanks guys.


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