Nano SPI speeds and buffer sizes?

Robotics & Edge Computing Jetson & Embedded Systems Jetson Nano
1

What are the SPI speeds and supported buffer sizes for the Jetson Nano? Before I start digging into configuration, I’d like to know the following:

  • What APIs/libraries are available to communicate over SPI?
  • What are the max SPI frequencies?
  • What are the max SPI buffer sizes that can be transmitted? And is it possible to produce a circular buffer to enable uninterrupted transfer of large amounts of data?
2

Have a check the struct spi_transfer, you can configure the size and speed. The max buffer and speed should depend on the device.

https://www.kernel.org/doc/html/v4.14/driver-api/spi.html

3

Is there nothing available in documentation or existing device drivers for this? My fear is that I go through that driver-api documentation and find that either I’m supposed to find that max speed myself from a datasheet somewhere, or that it’s not properly implemented within what’s available.

4

The host max support to 50 Mhz, but usually we care what device need to run for.

5

Found it. On page 2837 of the TRM for the Tegra X1. Maximum data rate is 65Mbps in master mode. The TX2 is limited to 50Mbps.