Can I Use SPI and I2C on the USB-8451 or USB-8452 at the Same Time?

Updated Mar 16, 2018

Reported In


  • USB-8451
  • USB-8452

Issue Details

I have a USB-8451/8452 I2C and SPI device.  Is it possible to use the SPI and I2C lines simultaneously?


It is not possible to use the SPI and I2C lines simultaneously on the USB-8451 or USB-8452.  This is because the resource is reserved while the session is open, and you cannot have 2 sessions open to the same resource.

However, it is possible to have one session open which can access both interfaces on the same device. While the two interfaces are not truly used simultaneously, then can be accessed sequentially.