SPIDriver is a tool for controlling any SPI device from your PC's USB port. It connects as a standard USB serial device, so there are no drivers to install. The serial protocol is so simple it fits on the back of the PCB, and there are included drivers for

• Windows/Mac/Linux GUI
• Windows/Mac/Linux command-line
• Python 2 and 3
• Windows/Mac/Linux C/C++

Features:

• live display shows you exactly what it's doing all the time
• sustained SPI transfers at 500 Kbps
• USB line voltage monitor to detect supply problems
• target device current measurement
• two auxiliary control lines, A and B
• dedicated power out lines. 2 each of GND, 3.3 V and 5 V. Up to 500 mA total
• signals color coded to match jumper colors
• all signals are 3.3 V, and are 5 V tolerant
• uses an FTDI USB serial adapter, and Silicon Labs automotive-grade microcontroller
• also reports uptime, temperature and running CRC of all traffic
• all sensors and signals controlled over serial

For example to read the 3-byte ID from this serial flash in Python:

>>> s = SpiDriver()
>>> s.sel()               # start command
>>> s.write(b'\x9f')      # command 9F is READ JEDEC ID 
>>> list(s.read(3))       # read next 3 bytes
[239, 64, 24]
>>> s.unsel()             # end command
>>>

or using the command line:

$ spi s t 0x9f r 3 u
0xef,0x40,0x18
$

Command-line tool

You can build the command-line tool like this:

$ cd c
$ make -f linux/Makefile 
mkdir -p build/
cc -o build/spi  -I common linux/spi.c common/spidriver.c
$ ./build/spi -h
Bad command '-h'

Commands are:
  i     display status information (uptime, voltage, current, temperature)
  s     SPI select
  u     SPI unselect
  w     write bytes to SPI
  r N   read N bytes from SPI
  a 0/1 Set A line
  b 0/1 Set B line