Blocking spi transmission with MOSFET or transistor?

Discussion in 'The Projects Forum' started by Avshi, May 19, 2015.

  1. Avshi

    Thread Starter New Member

    Jan 16, 2015
    28
    0
    Hello All! I'm working with the esp8266 connected to an mcu. I want to block the data lines to the mcu when I plug in a usb-serial converter (for flashing and debug purposes) possibly with p-channel fets or transistors connected to the 3.3v from usb. Is this a good idea or will the fets cause too much distortion or voltage drop when the mcu talks and listens to the esp8266?

    UPDATE: I found that I can route the 3.3v input to an interrupt on the mcu and disable spi on the rising edge and enable on falling edge.
     
    Last edited: May 20, 2015
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