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I have DMM which is producing pulse with duration of around few microseconds.
The pulse need to be sampled in PLC, which has sampling rate of 1ms.
In other words the cycle loop can't be reduced to microsecond resolution.
So it's impossible to reliably detect the pulse from DMM.
Could...
What I am trying to achieve is detect from MCU, whenever FTDI(FT232R) chip is connected to USB(not enumerated, just powered up from USB).
- When ONLY USB is connected, MCU will get his power supply from +5V bus and will detect on (B) pin that USB is connected.
- When ONLY VR will supply...
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