From f23971240165455313729886360541bee726b42c Mon Sep 17 00:00:00 2001 From: Erik Andresen Date: Wed, 28 Dec 2016 14:52:24 +0100 Subject: [PATCH] i2c: use python low level api instead ob c calls --- i2c.py | 23 ++++++++--------------- 1 file changed, 8 insertions(+), 15 deletions(-) diff --git a/i2c.py b/i2c.py index 2bb9f94..60d825d 100755 --- a/i2c.py +++ b/i2c.py @@ -7,7 +7,6 @@ import os import logging import struct import fcntl -from ctypes import * from time import sleep DEBUG=0 @@ -15,7 +14,6 @@ I2C_FILENAME = "/dev/i2c-2" logger = logging.getLogger(__name__) class i2c: - libc = CDLL("libc.so.6") I2C_SLAVE = 0x0703 # Use this slave address __single = None __lock = threading.Lock() @@ -34,33 +32,29 @@ class i2c: logger.warning("Error: (%s) I2C blocked %fs by %s!", parent, count*0.001, parent_owner) i2c.__parent_owner = inspect.stack()[1] i2c.__single = True - self.dev = i2c.libc.open(I2C_FILENAME, os.O_RDWR) + self.dev = os.open(I2C_FILENAME, os.O_RDWR) if self.dev < 0: raise IOError("open") fcntl.flock(self.dev, fcntl.LOCK_EX) - err = i2c.libc.ioctl(self.dev, i2c.I2C_SLAVE, addr>>1) - if err < 0: - raise IOError("ioctl") + fcntl.ioctl(self.dev, i2c.I2C_SLAVE, addr>>1) def write(self, s): - num_write = i2c.libc.write(self.dev, s, len(s)) + num_write = os.write(self.dev, s) if num_write != len(s): self.close() raise IOError("write: %d" % (num_write)) def read(self, num): - buf = create_string_buffer(num) - num_read = i2c.libc.read(self.dev, buf, num) - if num_read != num: + buf = os.read(self.dev, num) + if len(buf) != num: self.close() - raise IOError("read: %d" % (num_read)) - return buf.raw + raise IOError("read: %d" % (len(buf))) + return buf def close(self): if self.dev: - i2c.libc.close(self.dev) + os.close(self.dev) self.dev = None - #i2c.__parent_owner = None i2c.__single = None def __del__(self): @@ -84,7 +78,6 @@ def i2c_read_reg(addr, reg, num=1): if __name__ == "__main__": - import struct import sys dev = i2c(0x50) -- 2.39.2