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Can not program device

Sergy

Hi,

I have 2 pins that connected to transistors that turn on high-side FETs. One turns on 3.3v for the rest of the system and another one 4v.

When I turn on 3.3v everything is fine, but when I turn on 4v I can not reprogram device anymore in Keil - says Device not found.

4v lines (controlled by P0.05) do not even cross SWCLK or SWDIO lines. What could be the problem?

Device continues to operate properly, just cant do anything with the debugger.

Also eventually after a while i can reprogram the device (after i completely power it off, disconnect JTAG and UART-USB!!!).

Any idea what could be the problem?

Thanks!

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    Hello, the pin controls the switch which is transistor+mosfet. There is no voltage/current coming into this pin, its only output. So when pin is high it turns on transistor which in turn turns on FET that provides 4v to GSM module. My main problem to be honest is that I cant do any step-by-step debugging in Keil, but in the running mode it works fine.

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    Hello, the pin controls the switch which is transistor+mosfet. There is no voltage/current coming into this pin, its only output. So when pin is high it turns on transistor which in turn turns on FET that provides 4v to GSM module. My main problem to be honest is that I cant do any step-by-step debugging in Keil, but in the running mode it works fine.

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