[ts-7000] Re: [ts 7200] DIO Code

["erik_dykema" <>]

Hello-
     I have a question related to digital IO , and a (small) contribution.  
From reading some of the posts on this board, I've figured out SOME of the 
digital IO pinouts for the TS-7260 as accessed via sysfs.  With Linux 2.6, and 
sysfs, the mapping is like so:

Format: /sys/class/gpio/gpio# -> Pin #
8:1
9:2
10:3
11: ??
12: ??
13:6
14:7
15:8

where, for the TS-7260, the Pin # notation corresponds to the DIO1 header, with 
the ethernet port on the right, like so:

------------------------------
9 | a | b | c | d | e | f | g 
------------------------------
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8
------------------------------

     My question is, how are pins  4 and 5 accessed? When I attempt to set them 
up in what I would expect is the usual way (echo 11 > /sys/class/gpio/export ) 
, a device is not created as it is for the others.

     My (small) contribution is a python class that eases access to those pins 
which I have figured out the mapping for.  Thanks to the help I received from 
Petr, I was able to build myself a new kernel and filesystem, using Angstrom, 
which includes Python. Subsequently I wrote some code and a tester which might 
save someone else a little time if they are also trying to get this stuff 
working in Python.
     I uploaded the code to the "files" section of this board as 
ts7260_gpio.tar.gz , and have also pasted it below here. ( I have no idea if 
python code is readable / valid if copied and pasted off of this yahoo board ).

Thanks,
Erik

gpio.py:
#!/usr/bin/python

# Copyright 2011, Erik Dykema
# Licensed under the GNU GPL Version 3 , available at
# http://www.gnu.org/licenses/gpl-3.0.txt

import time, os

class ts7260_gpio_pin:
    output_pin_to_gpio_socket_mapping = {1:"8", 
                                         2:"9", 
                                         3:"10",
                                         6:"13", 
                                         7:"14",
                                         8:"15", 
                                         }
    pin_mode_mapping = {"output":"out",
                        "input":"in",
                        }

    gpio_prefix = "/sys/class/gpio"

    def __init__(self, output_pin=1, mode="output"):
        # Should test to make sure the inputs are good here.
        self.output_pin = output_pin
        self.mode = mode
        self.socket_mode = self.pin_mode_mapping[mode]

        self.gpio_export_target = "%s/export" % (self.gpio_prefix)

        self.gpio_socket_number = 
self.output_pin_to_gpio_socket_mapping[output_pin]
        self.gpio_socket_path = "%s/gpio%s" %(self.gpio_prefix, 
self.gpio_socket_number)

        self.value_target = "%s/value" % (self.gpio_socket_path)
        self.direction_target ="%s/direction" % (self.gpio_socket_path)

        
        # Can't "export" the device if it already exists
        if not os.path.exists(self.gpio_socket_path):
            # Signal sysfs to Export the GPIO device to the filesystem
            
self.write_character(self.gpio_socket_number,self.gpio_export_target)

        # Setup the device for the specified mode

        self.write_character(self.socket_mode,self.direction_target)



        # It seems wise, where speed during setup is not of ultimate importance
        # to allow the unit some time to adjust after changing output
        # modes.  This might be over cautious and could be deleted
        time.sleep(.25)

    def write_character(self, byte="1",target="/dev/null"):
        #print "target = %s" %(target)
        #print "byte = %s" %(byte)
        # print the output to the target
        fsock = open(target,'w')
        print >>fsock, byte
        #time.sleep(2)
        fsock.close()

    def on(self):
        self.write_character("1",self.value_target)

    def off(self):
        self.write_character("0",self.value_target)

    def blink(self, seconds=1):
        self.on()  # Turn on
        time.sleep(seconds)
        self.off() # Turn off


gpio_test.py:
#!/usr/bin/python

# Copyright 2011, Erik Dykema
# Licensed under the GNU GPL Version 3 , available at
# http://www.gnu.org/licenses/gpl-3.0.txt


from gpio import ts7260_gpio_pin

pin = dict()

for index in range(1,9):
    print "Attempting to Set Up pin %s" %(index)
    try:
        pin[index] = ts7260_gpio_pin(index)
    except:
        print "Pin %s doesn't work yet." %(index)

for index in range(1,9):
    if index in pin.keys():
        print "Blinking pin %s" %(index)
        pin[index].blink(.5)







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