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mcp4018: Add initial support for the mcp4018 digipot

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Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
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Kevin O'Connor 2019-02-12 20:15:11 -05:00
parent a090b31713
commit cc4ecef88b
3 changed files with 107 additions and 1 deletions
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25
config/example-extras.cfg
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@ -778,6 +778,31 @@
# default is to not scale the 'channel_x' parameters.
# Statically configured MCP4018 digipot connected via two gpio "bit
# banging" pins (one may define any number of sections with an
# "mcp4018" prefix).
#[mcp4018 my_digipot]
#scl_pin:
# The SCL "clock" pin. This parameter must be provided.
#sda_pin:
# The SDA "data" pin. This parameter must be provided.
#wiper:
# The value to statically set the given MCP4018 "wiper" to. This is
# typically set to a number between 0.0 and 1.0 with 1.0 being the
# highest resistance and 0.0 being the lowest resistance. However,
# the range may be changed with the 'scale' parameter (see
# below). This parameter must be provided.
#scale:
# This parameter can be used to alter how the 'wiper' parameter is
# interpreted. If provided, then the 'wiper' parameter should be
# between 0.0 and 'scale'. This may be useful when the MCP4018 is
# used to set stepper voltage references. The 'scale' can be set to
# the equivalent stepper amperage if the MCP4018 is at its highest
# resistance, and then the 'wiper' parameter can be specified using
# the desired amperage value for the stepper. The default is to not
# scale the 'wiper' parameter.
# Configure an SX1509 I2C to GPIO expander. Due to the delay incurred
# by I2C communication you should NOT use SX1509 pins as stepper enable,
# step or dir pins or any other pin that requires fast bit-banging. They