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Merge pull request #33 from WereCatf/master

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Improve the code for setting the 1V8-pin, including get-function
This commit is contained in:
Robert Wolterman
2016-12-01 10:31:40 -06:00
committed by GitHub
parent 617f562b1c e0c65de9a8
commit cf9916018b
2 changed files with 33 additions and 34 deletions
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59
CHIP_IO/Utilities.py
View File

@ -26,13 +26,36 @@
import subprocess
# Set the 1.8V-pin on the CHIP U13-header to given voltage
# Return False on error
def set_1v8_pin_voltage(voltage):
if not isinstance(voltage, int) and not isinstance(voltage, float):
return False
if voltage < 1.8 or voltage > 3.3:
return False
voltage=round((voltage - 1.8) / 0.1) << 4
if subprocess.call(["/usr/sbin/i2cset", "-f", "-y" ,"0", "0x34", "0x90", "0x03"]):
return False
if subprocess.call(["/usr/sbin/i2cset", "-f", "-y", "0", "0x34", "0x91", str(voltage)]):
return False
return True
# Get the voltage the 1.8V-pin on the CHIP U13-header has been configured as
# Return False on error
def get_1v8_pin_voltage():
p=subprocess.Popen(["/usr/sbin/i2cget", "-f", "-y", "0", "0x34", "0x90"], stdout=subprocess.PIPE)
output=p.communicate()[0].decode("utf-8").strip()
#Not configured as an output
if output != "0x03":
return False
p=subprocess.Popen(["/usr/sbin/i2cget", "-f", "-y", "0", "0x34", "0x91"], stdout=subprocess.PIPE)
output=p.communicate()[0].decode("utf-8").strip()
voltage=round((int(output, 16) >> 4) * 0.1 + 1.8, 1)
return voltage
# Enable 1.8V Pin on CHIP U13 Header
def enable_1v8_pin():
# CANNOT USE I2C LIB AS WE NEED TO FORCE THE COMMAND DUE TO THE KERNEL OWNING THE DEVICE
# First we have to write 0x00 to AXP-209 Register 0x91
subprocess.call('/usr/sbin/i2cset -f -y 0 0x34 0x91 0x00', shell=True)
# Then we have to write 0x03 to AXP-209 Register 0x90
subprocess.call('/usr/sbin/i2cset -f -y 0 0x34 0x90 0x03', shell=True)
set_1v8_pin_voltage(1.8)
# Disable 1.8V Pin on CHIP U13 Header
def disable_1v8_pin():
@ -41,29 +64,3 @@ def disable_1v8_pin():
subprocess.call('/usr/sbin/i2cset -f -y 0 0x34 0x91 0x05', shell=True)
# Then we have to write 0x07 to AXP-209 Register 0x90
subprocess.call('/usr/sbin/i2cset -f -y 0 0x34 0x90 0x07', shell=True)
# Change 1.8V Pin on CHIP U13 Header to 2.0V
def change_1v8_pin_to_2v0():
# CANNOT USE I2C LIB AS WE NEED TO FORCE THE COMMAND DUE TO THE KERNEL OWNING THE DEVICE
# First we have to write 0x20 to AXP-209 Register 0x91
subprocess.call('/usr/sbin/i2cset -f -y 0 0x34 0x91 0x20', shell=True)
# Then we have to write 0x03 to AXP-209 Register 0x90
subprocess.call('/usr/sbin/i2cset -f -y 0 0x34 0x90 0x03', shell=True)
# Change 1.8V Pin on CHIP U13 Header to 2.6V
def change_1v8_pin_to_2v6():
# CANNOT USE I2C LIB AS WE NEED TO FORCE THE COMMAND DUE TO THE KERNEL OWNING THE DEVICE
# First we have to write 0x80 to AXP-209 Register 0x91
subprocess.call('/usr/sbin/i2cset -f -y 0 0x34 0x91 0x80', shell=True)
# Then we have to write 0x03 to AXP-209 Register 0x90
subprocess.call('/usr/sbin/i2cset -f -y 0 0x34 0x90 0x03', shell=True)
# Change 1.8V Pin on CHIP U13 Header to 3.3V
def change_1v8_pin_to_3v3():
# CANNOT USE I2C LIB AS WE NEED TO FORCE THE COMMAND DUE TO THE KERNEL OWNING THE DEVICE
# First we have to write 0xF0 to AXP-209 Register 0x91
subprocess.call('/usr/sbin/i2cset -f -y 0 0x34 0x91 0xF0', shell=True)
# Then we have to write 0x03 to AXP-209 Register 0x90
subprocess.call('/usr/sbin/i2cset -f -y 0 0x34 0x90 0x03', shell=True)

8
README.rst
View File

@ -322,13 +322,15 @@ To use the utilities, here is sample code::
# Enable 1.8V Output
UT.enable_1v8_pin()
# Set 2.0V Output
UT.change_1v8_pin_to_2v0()
UT.set_1v8_pin_voltage(2.0)
# Set 2.6V Output
UT.change_1v8_pin_to_2v6()
UT.set_1v8_pin_voltage(2.6)
# Set 3.3V Output
UT.change_1v8_pin_to_3v3()
UT.set_1v8_pin_voltage(3.3)
# Disable 1.8V Output
UT.disable_1v8_pin()
# Get currently-configured voltage (returns False if the pin is not enabled as output)
UT.get_1v8_pin_voltage()
**Running tests**