TQMa93xxLA - YOCTO Linux BSP documentation
SPI
The MBa93xxLA has two SPI interfaces. They are available on the extension headers and can be tested with a loopback test.
SPI Overview
In order to determine the correct SPI interface name, the following command can be used:
ls /dev | grep spi
| Interface | Linux filesystem |
|---|---|
| SPI0 | spidev1.0 |
Loopback Test SPI Interface
For the loopback test, SPI_MOSI and SPI_MISO need to be bridged:
On MBa93xxLA the corresponding pins are pins 29 and 31 on X1.
echo -n -e "\x01\x0F" | spi-pipe -d <spi interface> -s 10000000 | hexdump (e.g. echo -n -e "\x01\x0F" | spi-pipe -d /dev/spidev1.0 -s 10000000 | hexdump)