mirror of
https://github.com/xtacocorex/CHIP_IO
synced 2025-07-20 21:03:22 +00:00
67 lines
3.0 KiB
Python
67 lines
3.0 KiB
Python
# 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
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# 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
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# 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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# 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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# Set the 1.8V-pin on the CHIP U13-header to given voltage
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# Return False on error
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def set_1v8_pin_voltage(voltage):
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if not isinstance(voltage, int) and not isinstance(voltage, float):
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return False
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if voltage < 1.8 or voltage > 3.3:
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return False
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voltage=round((voltage - 1.8) / 0.1) << 4
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if subprocess.call(["/usr/sbin/i2cset", "-f", "-y" ,"0", "0x34", "0x90", "0x03"]):
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return False
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if subprocess.call(["/usr/sbin/i2cset", "-f", "-y", "0", "0x34", "0x91", str(voltage)]):
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return False
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return True
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# Get the voltage the 1.8V-pin on the CHIP U13-header has been configured as
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# Return False on error
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def get_1v8_pin_voltage():
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p=subprocess.Popen(["/usr/sbin/i2cget", "-f", "-y", "0", "0x34", "0x90"], stdout=subprocess.PIPE)
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output=p.communicate()[0].decode("utf-8").strip()
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#Not configured as an output
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if output != "0x03":
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return False
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p=subprocess.Popen(["/usr/sbin/i2cget", "-f", "-y", "0", "0x34", "0x91"], stdout=subprocess.PIPE)
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output=p.communicate()[0].decode("utf-8").strip()
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voltage=round((int(output, 16) >> 4) * 0.1 + 1.8, 1)
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return voltage
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# Enable 1.8V Pin on CHIP U13 Header
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def enable_1v8_pin():
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set_1v8_pin_voltage(1.8)
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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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