In SX Microcontrollers, SX/B Compiler and SX-Key Tool, g_daubach wrote:

Fiveslo,

after all your descriptions, I can only assume that your SX-Key USB is damaged by some reason. When you try to program an SX, and the message "Vpp generation failed" comes up, this tells you that the SX-Key could not generate the programming voltage Vpp (about 12V) on the OSC1 pin. The SX-Key generates this voltage but also monitors itself if it could successfully generate it. If not, it returns an error state to the IDE causing the error message to be displayed.

Possible reasons for no Vpp generation are:

- SX-Key-internal failures, like shorts, damaged driver transistor, or a bad or backwards installed filter capacitor.
- Short or high load on the target's OSC1 pin which pulls down Vpp. This can happen when you plug on the SX-Key in wrong orientation, or when some device, like a clock generator is connected to OSC1.

As you could successfuly program the target with a serial SX-Key, I don't think that the target causes the problem. So you better contact Parallax tech support for help.

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