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gpio-led-screen.py
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gpio-led-screen.py
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#!/usr/bin/env python
# scp gpio-led-screen.py 10.0.0.110:~/ && ssh 10.0.0.110 scp -o UserKnownHostsFile=/dev/null -o StrictHostKeyChecking=no gpio-led-screen.py root@10.0.10.88:~/
# scpnk -oProxyCommand="ssh -W %h:%p 10.0.0.110" uImage-zynq-zybo.dtb root@10.0.10.88:~/
# scpnk -oProxyCommand="ssh -W %h:%p 10.0.0.110" gpio-led-screen.py root@10.0.10.88:~/
import os
import sys
import time
def quickfilerw(path, write = None):
if os.path.exists(path):
if write != None:
# print("writing to '%s' = %s" % (path, repr(write)))
with open(path, "wb") as f:
f.write(write)
return True
else:
with open(path, "rb") as f:
read = f.read().strip("\n")
# print("reading fromt '%s' = %s" % (path, repr(read)))
return read
raise Exception("File does not exist")
class GpioPin:
__sysfsroot__ = os.path.join("/sys", "class", "gpio")
@staticmethod
def __chip__(label):
for i in os.listdir(GpioPin.__sysfsroot__):
abspath = os.path.join(GpioPin.__sysfsroot__, i)
# print("looking at %s" % i)
if os.path.isdir(abspath) and i.startswith("gpiochip"):
labelpath = os.path.join(abspath, "label")
# print("labelpath = %s" % labelpath)
if os.path.exists(labelpath):
labelname = quickfilerw(labelpath)
# print("labelname == %s ?== %s" % (label, labelname))
if labelname == label:
return abspath
return None
@staticmethod
def chippin(label, pin):
chippath = GpioPin.__chip__(label)
if chippath == None:
return None
count = int(quickfilerw(os.path.join(chippath, "ngpio")))
base = int(quickfilerw(os.path.join(chippath, "base")))
if pin >= 0 and pin < count:
# print("pin %d, sys index = %d" % (pin, base + pin))
return GpioPin(base + pin)
raise Exception("Pin out of bounds for chip '%s' (total pins %d)" % (label, count))
def __init__(self, index):
self.path = os.path.join(GpioPin.__sysfsroot__, "gpio%d" % index)
self.index = index
def __export__(self):
if not os.path.exists(self.path):
quickfilerw(os.path.join(GpioPin.__sysfsroot__, "export"), "%d" % self.index)
def dir(self, output = True):
self.__export__()
dirpath = os.path.join(self.path, "direction")
if dirpath and os.path.exists(dirpath):
return quickfilerw(dirpath, "out" if output else "in")
return False
def set(self, value = None):
self.__export__()
path = os.path.join(self.path, "value")
if path and os.path.exists(path):
return quickfilerw(path, "%d" % value if value != None else None)
return False
def get(self):
return self.set(None)
def setrow(index):
print("setrow = %d" % index)
a0.set(index & (1 << 0))
a1.set(index & (1 << 1))
a2.set(index & (1 << 2))
if __name__ == "__main__":
jf = [None, 13, 10, 11, 12, None, None, 0, 9, 14, 15]
clk = GpioPin.chippin("zynq_gpio", jf[1])
lat = GpioPin.chippin("zynq_gpio", jf[2])
oe = GpioPin.chippin("zynq_gpio", jf[3])
a0 = GpioPin.chippin("zynq_gpio", jf[4]) # wrong?
# a0 = GpioPin.chippin("zynq_gpio", jf[7])
# a1 = GpioPin.chippin("zynq_gpio", jf[8])
# a2 = GpioPin.chippin("zynq_gpio", jf[9])
# r1 = GpioPin.chippin("zynq_gpio", jf[4])
# g1 = GpioPin.chippin("zynq_gpio", 0)
# b1 = GpioPin.chippin("zynq_gpio", 14)
clk.dir(True)
lat.dir(True)
oe.dir(True)
a0.dir(True)
clk.set(0)
lat.set(0)
oe.set(0)
a0.set(0)
n = 0
while True:
oe.set(1)
lat.set(0)
clk.set(0)
a0.set(n)
n += 1
if n > 1:
n = 0
# row,
for i in range(32):
clk.set(1)
# time.sleep(0.01)
clk.set(0)
# time.sleep(0.01)
time.sleep(0.001)
lat.set(1)
time.sleep(0.001)
lat.set(0)
# time.sleep(0.01)
time.sleep(0.001)
a0.set(0)
oe.set(0)
time.sleep(1)
# time.sleep(1)
# time.sleep(0.1)