Testing SPI with ADXL345 Module

Perform the following steps to test SPI with the ADXL345 module:

Connect the ADXL345 module to the 40-pin header as the following:

Figure 1. Connect ADXL345 Module to the Header
Locate to the following path for test tool, spidev_test.c:
```
cd /linux/tools/spi
```
Execute the following command under the test tool directory:
```
make CROSS_COMPILE=riscv64-linux-gnu- ARCH=riscv
```
Result:
The output file is spidev_test in the same directory.
Upload spidev_test to VisionFive 2, and change the execution permission by executing the following:
```
chmod +x spidev_test
```
Confirm the SPI device.
```
ls /dev/spidev*
```
Figure 2. Example Output

In this output, spidev1.0 is the device name.

Execute the following to read the device ID:

./spidev_test -H -O -D /dev/spidev1.0 -v -p \\x80\\x00

Execute the following to read the value for multiple registers:

./spidev_test -H -O -D /dev/spidev1.0 -v -p \\xec\\x00\\x00\\x00\\x00\\x00\\x00

Execute the following to read:

./spidev_test -H -O -D /dev/spidev1.0 -v -p \\x9e\\x00

Execute the following to write:

./spidev_test -H -O -D /dev/spidev1.0 -v -p \\x1e\\xaa

Execute the following to read the verification:

./spidev_test -H -O -D /dev/spidev1.0 -v -p \\x9e\\x00