Hi,
I am trying to get the 'i2c in python but always get this' mistake
Traceback (most recent call last):
File "lcd_i2c.py", line 68, in ?
i2c_init()
File "/usr/local/test/python/i2c_py.py", line 113, in i2c_init
if (i2c_open()<0):
File "/usr/local/test/python/i2c_py.py", line 185, in i2c_open
fcntl.ioctl(i2c_fd, _IO(ETRAXGPIO_IOCTYPE, IO_SETGET_OUTPUT),
iomask)
IOError: [Errno 14] Bad address
Some ideas?
code
#/* The following 4 ioctl's take a pointer as argument and handles
#* 32 bit ports (port G) properly.
#* These replaces IO_READBITS,IO_SETINPUT AND IO_SETOUTPUT
#*/
#define IO_READ_INBITS 0x10 /* *arg is result of reading the input
pins */
#define IO_READ_OUTBITS 0x11 /* *arg is result of reading the output
shadow */
#define IO_SETGET_INPUT 0x12 /* bits set in *arg is set to input,
# * *arg updated with current input pins.
# */
#define IO_SETGET_OUTPUT 0x13 /* bits set in *arg is set to output,
# * *arg updated with current output pins.
# */
#I2C user space bit banging example
import sys
import struct
import fcntl
import os
import time
import select
#----
# Generated by h2py 0.1.1 from <linux/ppdev.h>,
# then cleaned up a bit by Michael P. Ashton and then a gain by
chris ;-)
# Changes for Python2.2 support (c) September 2004 [EMAIL PROTECTED]
def sizeof(type): return struct.calcsize(type)
def _IOC(dir, type, nr, size): return int((dir << _IOC_DIRSHIFT ) |
(type << _IOC_TYPESHIFT ) |\
(nr << _IOC_NRSHIFT ) | (size <<
_IOC_SIZESHIFT))
def _IO(type, nr): return _IOC(_IOC_NONE, (type), (nr), 0)
def _IOR(type,nr,size): return _IOC(_IOC_READ, type, nr, sizeof(size))
def _IOW(type,nr,size): return _IOC(_IOC_WRITE, type, nr, sizeof(size))
_IOC_SIZEBITS = 14
_IOC_SIZEMASK = ((1 << _IOC_SIZEBITS)-1)#(1L << _IOC_SIZEBITS ) - 1
_IOC_NRSHIFT = 0
_IOC_NRBITS = 8
_IOC_TYPESHIFT = _IOC_NRSHIFT + _IOC_NRBITS
_IOC_TYPEBITS = 8
_IOC_SIZESHIFT = _IOC_TYPESHIFT + _IOC_TYPEBITS
IOCSIZE_MASK = _IOC_SIZEMASK << _IOC_SIZESHIFT
IOCSIZE_SHIFT = _IOC_SIZESHIFT
# Python 2.2 uses a signed int for the ioctl() call, so ...
if ( sys.version_info[0] < 3 ) or ( sys.version_info[1] < 3 ):
_IOC_WRITE = 1L
_IOC_READ = -2L
_IOC_INOUT = -1L
else:
_IOC_WRITE = 1L
_IOC_READ = 2L
_IOC_INOUT = 3L
_IOC_DIRSHIFT = _IOC_SIZESHIFT + _IOC_SIZEBITS
IOC_INOUT = _IOC_INOUT << _IOC_DIRSHIFT
IOC_IN = _IOC_WRITE << _IOC_DIRSHIFT
IOC_OUT = _IOC_READ << _IOC_DIRSHIFT
_IOC_NONE = 0
_IOC_DIRBITS = 2
_IOC_DIRMASK = (1 << _IOC_DIRBITS) - 1
_IOC_NRMASK = (1 << _IOC_NRBITS) - 1
_IOC_TYPEMASK = (1 << _IOC_TYPEBITS ) - 1
def _IOC_DIR(nr): return (nr >> _IOC_DIRSHIFT) & _IOC_DIRMASK
def _IOC_NR(nr): return (nr >> _IOC_NRSHIFT) & _IOC_NRMASK
def _IOC_SIZE(nr): return (nr >> _IOC_SIZESHIFT) & _IOC_SIZEMASK
def _IOC_TYPE(nr): return (nr >> _IOC_TYPESHIFT) & _IOC_TYPEMASK
def _IOWR(type, nr, size): return _IOC(_IOC_READ | _IOC_WRITE, type,
nr , sizeof(size))
MODEM_POWER_LINE = 1<<28
ETRAXGPIO_IOCTYPE = 43
IO_READBITS = 0x1
IO_SETBITS = 0x2
IO_CLRBITS = 0x3
IO_HIGHALARM = 0x4
IO_LOWALARM = 0x5
IO_CLRALARM = 0x6
IO_SETGET_INPUT = 0x12
IO_SETGET_OUTPUT = 0x13
IO_SETINPUT = 0x9
IO_SETOUTPUT = 0xA
IO_READ_INBITS = 0x10
IO_READ_OUTBITS = 0x11
I2C_CLOCK_HIGH = 1
I2C_CLOCK_LOW = 0
I2C_DATA_HIGH = 1
I2C_DATA_LOW = 0
CLOCK_LOW_TIME = 8
CLOCK_HIGH_TIME = 8
START_CONDITION_HOLD_TIME = 8
STOP_CONDITION_HOLD_TIME = 8
ENABLE_OUTPUT = 0x01
ENABLE_INPUT = 0x00
I2C_DATA_LINE = 1<<24
I2C_CLOCK_LINE = 1<<17
device = "/dev/gpiog"
i2c_fd = os.open(device, os.O_RDWR)
#Get the SDA line state
def i2c_init():
if (i2c_open()<0):
printf("Apertura del bus I2C fallita\n")
else:
pass
def i2c_getbit():
value=fcntl.ioctl(i2c_fd, _IO(ETRAXGPIO_IOCTYPE, IO_READBITS))
if ((value&(I2C_DATA_LINE))==0):
return 0
else:
return 1
# Set the SDA line as output
def i2c_dir_out():
iomask = I2C_DATA_LINE
fcntl.ioctl(i2c_fd, _IO(ETRAXGPIO_IOCTYPE, IO_SETGET_OUTPUT), iomask)
# Set the SDA line as input
def i2c_dir_in():
iomask = I2C_DATA_LINE
fcntl.ioctl(i2c_fd, _IO(ETRAXGPIO_IOCTYPE, IO_SETGET_INPUT), iomask)
# Set the SDA line state
def i2c_data(state):
if (state==1):
i2c_dir_in()
else:
i2c_dir_out()
fcntl.ioctl(i2c_fd, _IO(ETRAXGPIO_IOCTYPE, IO_CLRBITS),
I2C_DATA_LINE)
# Set the SCL line state
def i2c_clk(state):
if (state==1):
fcntl.ioctl(i2c_fd, _IO(ETRAXGPIO_IOCTYPE, IO_SETBITS),
I2C_CLOCK_LINE)
else:
fcntl.ioctl(i2c_fd, _IO(ETRAXGPIO_IOCTYPE, IO_CLRBITS),
I2C_CLOCK_LINE)
#Read a byte from I2C bus and send the ack sequence
#Put islast = 1 is this is the last byte to receive from the slave
def i2c_inbyte(islast):
#Read data byte
i2c_clk(0)
i2c_dir_in()
for i in range (0, 8):
i2c_clk(1)
bitvalue = i2c_getbit()
value = bitvalue
value = value | bitvalue
if (i<7):
value <<= 1
i2c_clk(0)
#Send Ack if is not the last byte to read
if (islast==0):
i2c_dir_out()
i2c_data(0)
i2c_clk(1)
i2c_clk(0)
i2c_dir_in()
else:
#Doesn't send Ack if is the last byte to read
i2c_dir_in()
i2c_clk(1)
i2c_clk(0)
return value
# Open the GPIOB dev
def i2c_open():
iomask = I2C_CLOCK_LINE
print i2c_fd
print ETRAXGPIO_IOCTYPE
print IO_SETGET_OUTPUT
print iomask
fcntl.ioctl(i2c_fd, _IO(ETRAXGPIO_IOCTYPE, IO_SETGET_OUTPUT), iomask)
iomask = I2C_DATA_LINE
fcntl.ioctl(i2c_fd, _IO(ETRAXGPIO_IOCTYPE, IO_SETGET_INPUT), iomask)
fcntl.ioctl(i2c_fd, _IO(ETRAXGPIO_IOCTYPE, IO_SETBITS), I2C_DATA_LINE)
i2c_dir_in()
i2c_clk(1)
return i2c_fd
# Close the GPIOB dev
def i2c_close():
i2c_dir_in()
os.close(i2c_fd)
# Send a start sequence to I2C bus
def i2c_start():
i2c_clk(0)
i2c_data(1)
i2c_clk(1)
i2c_data(0)
# Send a stop sequence to I2C bus
def i2c_stop():
i2c_clk(0)
i2c_data(0)
i2c_clk(1)
i2c_data(1)
# Send a byte to the I2C bus and return the ack sequence from slave
# rtc
# 0 = Nack, 1=Ack
def i2c_outbyte(x):
i2c_clk(0)
for i in range(0, 8):
if (int(x) & 0x80):
i2c_data(1)
else:
i2c_data(0)
i2c_clk(1)
i2c_clk(0)
x = int(x) << 1
i2c_dir_in()
i2c_clk(1)
ack=i2c_getbit()
i2c_clk(0)
if (ack==0):
return 1
else:
return 0
--
Luca <[EMAIL PROTECTED]>
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