Find RaspberryPi model and GPIO mode

[Gumboil]

I am writing objects for general use. Are there any functions in Python I can call which will return the Pi model that is being used and the GPIO mode (BOARD or BCM) that has been specified?

[joan]

Depends on the Python module you are using.

pigpio has http://abyz.co.uk/rpi/pigpio/python.htm ... e_revision

I have no idea if the modules which use alternative mappings of gpio names support a method of asking which is currently in use (it's meaningless outside such software). For instance pigpio only use Broadcom gpio numbers.

[Gumboil]

Thank you Joan - that is helpful

[DougieLawson]

Code: Select all

#!/usr/bin/python3

def getRevision():
  # Extract revision from cpuinfo file
  revision = "ERROR"
  try:
    f = open('/proc/cpuinfo','r')
    for line in f:
      if line[0:8]=='Revision':
        revision = line[11:15]
    f.close()
  except:
    revision = "ERROR"

  return revision

def revToModel():
  rev = getRevision()
  model = [
    "0002", ["Model B Rev 1.0", "256MB"],
    "0003", ["Model B Rev 1.0 (no fuses,D14)", "256MB"],
    "0004", ["Model B Rev 2.0 (mounting holes,Sony)", "256MB"],
    "0005", ["Model B Rev 2.0 (mounting holes,Qisda)", "256MB"],
    "0006", ["Model B Rev 2.0 (mounting holes,Egoman)", "256MB"],
    "0007", ["Model A (Egoman)", "256MB"],
    "0008", ["Model A (Sony)", "256MB"],
    "0009", ["Model A (Qisda)", "256MB"],
    "000d", ["Model B Rev 2.0 (mounting holes,Egoman)", "512MB"],
    "000e", ["Model B Rev 2.0 (mounting holes,Sony)", "512MB"],
    "000f", ["Model B Rev 2.0 (mounting holes,Qisda)", "512MB"],
    "0010", ["Model B+", "512MB"],
    "0011", ["Compute Module", "512MB"],
    "0012", ["Model A+", "256MB"]
  ]
  ix = model.index(rev)
  board, memory = model[ix+1]
  return (rev, board, memory)

rev, board, memory = revToModel()
print ("Revision: %s, Board: %s, Memory: %s" % (rev,board,memory))

[Gumboil]

Excellent - thank you Dougie

[DougieLawson]

Excellent - thank you Dougie

It's not future proof.

If the foundation create a model C, C+, B++ or model Q or anything with a new revision value my code will barf. Also the way I'm parsing the data from /proc/cpuinfo leaves a lot to be desired since I should probably be using a regex rather than a simple string compare and relying on positional data/length.

But it works for now.

[RobHenry]

But it works for now.

It doesn't work if the warranty bit is set:

Code: Select all

rob@raspberrypi ~ $ cat /proc/cpuinfo |grep Revision
Revision	: 100000e

Could be fixed in a number of ways, I don't have a pi without the warranty bit set so can't regression test.

[DougieLawson]

But it works for now.

It doesn't work if the warranty bit is set:

Code: Select all

rob@raspberrypi ~ $ cat /proc/cpuinfo |grep Revision
Revision	: 100000e

Could be fixed in a number of ways, I don't have a pi without the warranty bit set so can't regression test.

Your problem, you can code round it.

hint: change revision = line[-4:] to just work with the last 4 characters on the line.

I've never had any desire to overclock any of my three Raspberry Pis so all of my warranty bits are intact. You can also get revision directly from /sys/module/bcm2708/parameters/boardrev as a decimal value (if boardrev > 65535 then subtract 16,777,216 to lose the warranty bit).

Revision (as a hex value) is also available by parsing /proc/cmdline ("bcm2708.boardrev=0x??").