mirror of
https://github.com/xtacocorex/CHIP_IO
synced 2025-07-20 04:43:21 +00:00
LRADC support to close out feature #15. Added Utilities to enable and disable the 1.8v pin on U13. Updated README. Updated version to 2.3
This commit is contained in:
Robert Wolterman
@ -1,3 +1,11 @@
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0.2.3
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----
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* LRADC Support
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* Added Utilities
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- Enable/Disable the 1.8V Pin
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- Change 1.8V Pin to output either 2.0V, 2.6V, or 3.3V
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(Current limited to 50mA)
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0.2.2
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----
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* Fixes for Issue #16
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228
CHIP_IO/LRADC.py
Normal file
228
CHIP_IO/LRADC.py
Normal file
@ -0,0 +1,228 @@
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# Copyright (c) 2016 Robert Wolterman
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy of
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# this software and associated documentation files (the "Software"), to deal in
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# the Software without restriction, including without limitation the rights to
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# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
|
||||
# of the Software, and to permit persons to whom the Software is furnished to do
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||||
# so, subject to the following conditions:
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||||
#
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||||
# The above copyright notice and this permission notice shall be included in all
|
||||
# copies or substantial portions of the Software.
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||||
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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||||
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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# SOFTWARE.
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import os
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import time
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# Global Variables
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DEBUG = False
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DEVICE_EXIST = True
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# Default Sample Rate Variables
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SAMPLE_RATE_32P25 = 32.25
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SAMPLE_RATE_62O5 = 62.5
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SAMPLE_RATE_125 = 125
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SAMPLE_RATE_250 = 250
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SAMPLE_RATES = []
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# Scale Factor
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SCALE_FACTOR = 31.25
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# File Locations
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LRADC_BASE_DEVICE_FILE = "/sys/bus/iio/devices/iio:device0"
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AVAILABLE_SAMPLE_RATE_FILE = "/sampling_frequency_available"
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SCALE_FACTOR_FILE = "/in_voltage_scale"
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CURRENT_SAMPLE_RATE_FILE = "/in_voltage_sampling_frequency"
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RAW_VOLTAGE_CHAN0_FILE = "/in_voltage0_raw"
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RAW_VOLTAGE_CHAN1_FILE = "/in_voltage1_raw"
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def enable_debug():
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global DEBUG
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DEBUG = True
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def setup(rate=250):
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# First we determine if the device exists
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if not os.path.exists(LRADC_BASE_DEVICE_FILE):
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global DEVICE_EXIST
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DEVICE_EXIST = False
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raise Exception("LRADC Device does not exist")
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else:
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# Set the Sample Rate
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set_sample_rate(rate)
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def get_device_exist():
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return DEVICE_EXIST
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def get_scale_factor():
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# If we do not have a device, lets throw an exception
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if not DEVICE_EXIST:
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raise Exception("LRADC Device does not exist")
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# Get the data from the file
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f = open(LRADC_BASE_DEVICE_FILE+SCALE_FACTOR_FILE,"r")
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dat = f.readline()
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f.close()
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# Set the Scale Factor
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global SCALE_FACTOR
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SCALE_FACTOR = float(dat.strip())
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# Debug
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if DEBUG:
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print("Current LRADC Scaling Factor: {0}").format(SCALE_FACTOR)
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return SCALE_FACTOR
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def get_allowable_sample_rates():
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# If we do not have a device, lets throw an exception
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if not DEVICE_EXIST:
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raise Exception("LRADC Device does not exist")
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# Get the data from the file
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f = open(LRADC_BASE_DEVICE_FILE+AVAILABLE_SAMPLE_RATE_FILE,"r")
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dat = f.readline()
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f.close()
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global SAMPLE_RATES
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tmp = dat.strip().split(" ")
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for i in xrange(len(tmp)):
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if "." in tmp[i]:
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tmp[i] = float(tmp[i])
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else:
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tmp[i] = int(tmp[i])
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SAMPLE_RATES = tmp
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# Debug
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if DEBUG:
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print("Allowable Sampling Rates:")
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for rate in SAMPLE_RATES:
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print("{0}").format(rate)
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return tuple(SAMPLE_RATES)
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def set_sample_rate(rate):
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# If we do not have a device, lets throw an exception
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if not DEVICE_EXIST:
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raise Exception("LRADC Device does not exist")
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# Debug
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if DEBUG:
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print("Setting Sample Rate to: {0}").format(rate)
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# Check to see if the rates were gathered already
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global SAMPLE_RATES
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if SAMPLE_RATES == []:
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tmp = get_allowable_sample_rates()
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# Range check the input rate
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if rate not in SAMPLE_RATES:
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raise ValueError("Input Rate an Acceptable Value")
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# Write the rate
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f = open(LRADC_BASE_DEVICE_FILE+CURRENT_SAMPLE_RATE_FILE,"w")
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mystr = "%.2f" % rate
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f.write(mystr)
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f.close()
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# Verify write went well
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crate = get_sample_rate()
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if crate != rate:
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raise Exception("Unable to write new Sampling Rate")
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def get_sample_rate():
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# If we do not have a device, lets throw an exception
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if not DEVICE_EXIST:
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raise Exception("LRADC Device does not exist")
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# Get the data from the file
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f = open(LRADC_BASE_DEVICE_FILE+CURRENT_SAMPLE_RATE_FILE,"r")
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dat = f.read()
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f.close()
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dat = dat.strip()
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if "." in dat:
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dat = float(dat)
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else:
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dat = int(dat)
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# Debug
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if DEBUG:
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print("Current Sampling Rate: {0}").format(dat)
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return dat
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def get_chan0_raw():
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# If we do not have a device, lets throw an exception
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if not DEVICE_EXIST:
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raise Exception("LRADC Device does not exist")
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# Get the data from the file
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f = open(LRADC_BASE_DEVICE_FILE+RAW_VOLTAGE_CHAN0_FILE,"r")
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dat = f.readline()
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f.close()
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dat = float(dat.strip())
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# Debug
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if DEBUG:
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print("CHAN0 RAW: {0}").format(dat)
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return dat
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def get_chan1_raw():
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# If we do not have a device, lets throw an exception
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if not DEVICE_EXIST:
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raise Exception("LRADC Device does not exist")
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# Get the data from the file
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f = open(LRADC_BASE_DEVICE_FILE+RAW_VOLTAGE_CHAN1_FILE,"r")
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dat = f.readline()
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f.close()
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dat = float(dat.strip())
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# Debug
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if DEBUG:
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print("CHAN1 RAW: {0}").format(dat)
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return dat
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def get_chan0():
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# If we do not have a device, lets throw an exception
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if not DEVICE_EXIST:
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raise Exception("LRADC Device does not exist")
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# Get the raw data first
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dat = get_chan0_raw()
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# Apply scale factor
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dat *= SCALE_FACTOR
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# Debug
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if DEBUG:
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print("CHAN0: {0}").format(dat)
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return dat
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def get_chan1():
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# If we do not have a device, lets throw an exception
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if not DEVICE_EXIST:
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raise Exception("LRADC Device does not exist")
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# Get the raw data first
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dat = get_chan1_raw()
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# Apply scale factor
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dat *= SCALE_FACTOR
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# Debug
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if DEBUG:
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print("CHAN1: {0}").format(dat)
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return dat
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@ -1,3 +1,22 @@
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# Copyright (c) 2016 Robert Wolterman
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#
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# Permission is hereby granted, free of charge, to any person obtaining a copy of
|
||||
# this software and associated documentation files (the "Software"), to deal in
|
||||
# the Software without restriction, including without limitation the rights to
|
||||
# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
|
||||
# of the Software, and to permit persons to whom the Software is furnished to do
|
||||
# so, subject to the following conditions:
|
||||
#
|
||||
# The above copyright notice and this permission notice shall be included in all
|
||||
# copies or substantial portions of the Software.
|
||||
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
# SOFTWARE.
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||||
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import os
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import shutil
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import time
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@ -79,7 +98,7 @@ def _set_overlay_verify(name, overlay_path, config_path):
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print("Config path already exists! Not moving forward")
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print("config_path: {0}".format(config_path))
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return -1
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# MAKE THE CONFIGURATION PATH
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os.makedirs(config_path)
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@ -198,5 +217,5 @@ def unload(overlay):
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_LOADED[overlay.upper()] = False
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else:
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raise ValueError("Invalid Overlay name specified! Choose between: I2C1, SPI2, PWM0, CUST")
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69
CHIP_IO/Utilities.py
Normal file
69
CHIP_IO/Utilities.py
Normal file
@ -0,0 +1,69 @@
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# Copyright (c) 2016 Robert Wolterman
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#
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||||
# Permission is hereby granted, free of charge, to any person obtaining a copy of
|
||||
# this software and associated documentation files (the "Software"), to deal in
|
||||
# the Software without restriction, including without limitation the rights to
|
||||
# use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
|
||||
# of the Software, and to permit persons to whom the Software is furnished to do
|
||||
# so, subject to the following conditions:
|
||||
#
|
||||
# The above copyright notice and this permission notice shall be included in all
|
||||
# copies or substantial portions of the Software.
|
||||
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
||||
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
||||
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
|
||||
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
||||
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
||||
# SOFTWARE.
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# CHIP_IO Utilities
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# Random functions to enable fun stuff on the CHIP!
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# Credit goes to nonokuono (https://bbs.nextthing.co/users/nonokunono)
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# for gathering the i2cset commands from the AXP-209 datasheet for 2.0, 2.6, and 3.3V output
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# and for figuring out the ADC setup on the AXP-209
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import subprocess
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# Enable 1.8V Pin on CHIP U13 Header
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def enable_1v8_pin():
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# CANNOT USE I2C LIB AS WE NEED TO FORCE THE COMMAND DUE TO THE KERNEL OWNING THE DEVICE
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# First we have to write 0x00 to AXP-209 Register 0x91
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subprocess.call('/usr/sbin/i2cset -f -y 0 0x34 0x91 0x00', shell=True)
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# Then we have to write 0x03 to AXP-209 Register 0x90
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subprocess.call('/usr/sbin/i2cset -f -y 0 0x34 0x90 0x03', shell=True)
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# Disable 1.8V Pin on CHIP U13 Header
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def disable_1v8_pin():
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# CANNOT USE I2C LIB AS WE NEED TO FORCE THE COMMAND DUE TO THE KERNEL OWNING THE DEVICE
|
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# First we have to write 0x05 to AXP-209 Register 0x91
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subprocess.call('/usr/sbin/i2cset -f -y 0 0x34 0x91 0x05', shell=True)
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# Then we have to write 0x07 to AXP-209 Register 0x90
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subprocess.call('/usr/sbin/i2cset -f -y 0 0x34 0x90 0x07', shell=True)
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|
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# Change 1.8V Pin on CHIP U13 Header to 2.0V
|
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def change_1v8_pin_to_2v0():
|
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# CANNOT USE I2C LIB AS WE NEED TO FORCE THE COMMAND DUE TO THE KERNEL OWNING THE DEVICE
|
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# First we have to write 0x20 to AXP-209 Register 0x91
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subprocess.call('/usr/sbin/i2cset -f -y 0 0x34 0x91 0x20', shell=True)
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# Then we have to write 0x03 to AXP-209 Register 0x90
|
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subprocess.call('/usr/sbin/i2cset -f -y 0 0x34 0x90 0x03', shell=True)
|
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|
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# Change 1.8V Pin on CHIP U13 Header to 2.6V
|
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def change_1v8_pin_to_2v6():
|
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# CANNOT USE I2C LIB AS WE NEED TO FORCE THE COMMAND DUE TO THE KERNEL OWNING THE DEVICE
|
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# First we have to write 0x80 to AXP-209 Register 0x91
|
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subprocess.call('/usr/sbin/i2cset -f -y 0 0x34 0x91 0x80', shell=True)
|
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# Then we have to write 0x03 to AXP-209 Register 0x90
|
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subprocess.call('/usr/sbin/i2cset -f -y 0 0x34 0x90 0x03', shell=True)
|
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|
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# Change 1.8V Pin on CHIP U13 Header to 3.3V
|
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def change_1v8_pin_to_3v3():
|
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# CANNOT USE I2C LIB AS WE NEED TO FORCE THE COMMAND DUE TO THE KERNEL OWNING THE DEVICE
|
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# First we have to write 0xF0 to AXP-209 Register 0x91
|
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subprocess.call('/usr/sbin/i2cset -f -y 0 0x34 0x91 0xF0', shell=True)
|
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# Then we have to write 0x03 to AXP-209 Register 0x90
|
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subprocess.call('/usr/sbin/i2cset -f -y 0 0x34 0x90 0x03', shell=True)
|
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|
||||
|
||||
51
README.rst
51
README.rst
@ -193,10 +193,10 @@ Polling inputs::
|
||||
|
||||
Waiting for an edge (GPIO.RISING, GPIO.FALLING, or GPIO.BOTH::
|
||||
|
||||
This only works for the AP-EINT1, AP-EINT3, and XPO Pins on the CHIP
|
||||
|
||||
GPIO.wait_for_edge(channel, GPIO.RISING)
|
||||
|
||||
This only works for the AP-EINT1, AP-EINT3, and XPO Pins on the CHIP
|
||||
|
||||
Detecting events::
|
||||
|
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GPIO.setup("XIO-P0", GPIO.IN)
|
||||
@ -247,9 +247,34 @@ Use SOFTPWM at low speeds (hundreds of Hz) for the best results. Do not use for
|
||||
|
||||
If using SOFTPWM and PWM at the same time, import CHIP_IO.SOFTPWM as SPWM or something different than PWM as to not confuse the library.
|
||||
|
||||
**ADC**::
|
||||
**LRADC**::
|
||||
|
||||
Not Implemented yet
|
||||
The LRADC was enabled in the 4.4.13-ntc-mlc. This is a 6 bit ADC that is 2 Volt tolerant.
|
||||
Sample code below details how to talk to the LRADC.
|
||||
|
||||
import CHIP_IO.LRADC as ADC
|
||||
# Enable Debug
|
||||
ADC.enable_debug()
|
||||
# Check to see if the LRADC Device exists
|
||||
# Returns True/False
|
||||
ADC.get_device_exists()
|
||||
# Setup the LRADC
|
||||
# Specify a sampling rate if needed
|
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ADC.setup(rate)
|
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# Get the Scale Factor
|
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factor = ADC.get_scale_factor()
|
||||
# Get the allowable Sampling Rates
|
||||
sampleratestuple = ADC.get_allowable_sample_rates()
|
||||
# Set the sampling rate
|
||||
ADC.set_sample_rate(rate)
|
||||
# Get the current sampling rate
|
||||
currentrate = ADC.get_sample_rate()
|
||||
# Get the Raw Channel 0 or 1 data
|
||||
raw = ADC.get_chan0_raw()
|
||||
raw = ADC.get_chan1_raw()
|
||||
# Get the factored ADC Channel data
|
||||
fulldata = ADC.get_chan0()
|
||||
fulldata = ADC.get_chan1()
|
||||
|
||||
**SPI**::
|
||||
|
||||
@ -287,6 +312,24 @@ There is no verification that the Custom Overlay is setup properly, it's fire an
|
||||
|
||||
**OverlayManager requires a 4.4 kernel with the CONFIG_OF_CONFIGFS option enabled in the kernel config.**
|
||||
|
||||
**Utilties**::
|
||||
|
||||
CHIP_IO now supports the ability to enable and disable the 1.8V port on U13. This voltage rail isn't enabled during boot.
|
||||
|
||||
To use the utilities, here is sample code::
|
||||
|
||||
import CHIP_IO.Utilities as UT
|
||||
# Enable 1.8V Output
|
||||
UT.enable_1v8_pin()
|
||||
# Set 2.0V Output
|
||||
UT.change_1v8_pin_to_2v0()
|
||||
# Set 2.6V Output
|
||||
UT.change_1v8_pin_to_2v6()
|
||||
# Set 3.3V Output
|
||||
UT.change_1v8_pin_to_3v3()
|
||||
# Disable 1.8V Output
|
||||
UT.disable_1v8_pin()
|
||||
|
||||
**Running tests**
|
||||
|
||||
Install py.test to run the tests. You'll also need the python compiler package for py.test.::
|
||||
|
||||
2
setup.py
2
setup.py
@ -20,7 +20,7 @@ classifiers = ['Development Status :: 3 - Alpha',
|
||||
'Topic :: System :: Hardware']
|
||||
|
||||
setup(name = 'CHIP_IO',
|
||||
version = '0.2.2',
|
||||
version = '0.2.3',
|
||||
author = 'Robert Wolterman',
|
||||
author_email = 'robert.wolterman@gmail.com',
|
||||
description = 'A module to control CHIP IO channels',
|
||||
|
||||
@ -76,6 +76,6 @@ void define_constants(PyObject *module)
|
||||
both_edge = Py_BuildValue("i", BOTH_EDGE);
|
||||
PyModule_AddObject(module, "BOTH", both_edge);
|
||||
|
||||
version = Py_BuildValue("s", "0.2.2");
|
||||
version = Py_BuildValue("s", "0.2.3");
|
||||
PyModule_AddObject(module, "VERSION", version);
|
||||
}
|
||||
|
||||
67
test/lradc_test.py
Normal file
67
test/lradc_test.py
Normal file
@ -0,0 +1,67 @@
|
||||
#!/usr/bin/python
|
||||
|
||||
import CHIP_IO.LRADC as ADC
|
||||
|
||||
# == ENABLE DEBUG ==
|
||||
print("ENABLING LRADC DEBUG OUTPUT")
|
||||
ADC.enable_debug()
|
||||
|
||||
# == SETUP ==
|
||||
print("LRADC SETUP WITH SAMPLE RATE OF 125")
|
||||
ADC.setup(125)
|
||||
|
||||
# == SCALE FACTOR ==
|
||||
print("GETTING SCALE FACTOR")
|
||||
scalefactor = ADC.get_scale_factor()
|
||||
print(scalefactor)
|
||||
print("")
|
||||
|
||||
# == ALLOWABLE SAMPLING RATES ==
|
||||
print("GETTING ALLOWABLE SAMPLE RATES")
|
||||
rates = ADC.get_allowable_sample_rates()
|
||||
print(rates)
|
||||
print("IS 32.25 IN RATE TUPLE")
|
||||
print(ADC.SAMPLE_RATE_32P25 in rates)
|
||||
print("")
|
||||
|
||||
# == CURRENT SAMPLE RATE ==
|
||||
print("CURRENT SAMPLING RATE")
|
||||
crate = ADC.get_sample_rate()
|
||||
print(crate)
|
||||
print("")
|
||||
|
||||
# == SET SAMPLE RATE ==
|
||||
print("SETTING SAMPLE RATE TO 62.5")
|
||||
ADC.set_sample_rate(62.5)
|
||||
crate = ADC.get_sample_rate()
|
||||
print(crate)
|
||||
print("")
|
||||
|
||||
# == CHAN 0 RAW ==
|
||||
print("READING LRADC CHAN0 RAW")
|
||||
raw0 = ADC.get_chan0_raw()
|
||||
print(raw0)
|
||||
print("")
|
||||
|
||||
# == CHAN 1 RAW ==
|
||||
print("READING LRADC CHAN1 RAW")
|
||||
raw1 = ADC.get_chan1_raw()
|
||||
print(raw1)
|
||||
print("")
|
||||
|
||||
# == CHAN 0 ==
|
||||
print("READING LRADC CHAN0 WITH SCALE APPLIED")
|
||||
full0 = ADC.get_chan0()
|
||||
print(full0)
|
||||
print("")
|
||||
|
||||
# == CHAN 1 ==
|
||||
print("READING LRADC CHAN1 WITH SCALE APPLIED")
|
||||
full1 = ADC.get_chan1()
|
||||
print(full1)
|
||||
print("")
|
||||
|
||||
# == RESET ==
|
||||
print("RESETING SAMPLE RATE TO 250")
|
||||
ADC.set_sample_rate(250)
|
||||
|
||||
Reference in New Issue
Block a user