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chipmisc: Add support for configuring ad5206 digipots

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Support an "ad5206" config section so that one can configure the
digipots found on Reprap "RAMBo" boards.

Signed-off-by: Kevin O'Connor <kevin@koconnor.net>
This commit is contained in:
Kevin O'Connor
2017-08-25 13:52:10 -04:00
parent 9d75c3b0ca
commit 931811ab59
4 changed files with 80 additions and 14 deletions
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30
config/example-extras.cfg
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@@ -81,3 +81,33 @@
# enabled, and then the 'value' parameter can be specified using the
# desired amperage for the stepper. The default is to not scale the
# 'value' parameter.
# Statically configured AD5206 digipots connected via SPI bus (one may
# define any number of sections with an "ad5206" prefix).
#[ad5206 my_digipot]
#enable_pin:
# The pin corresponding to the AD5206 chip select line. This pin
# will be set to low at the start of SPI messages and raised to high
# after the message completes. This parameter must be provided.
#channel_1:
#channel_2:
#channel_3:
#channel_4:
#channel_5:
#channel_6:
# The value to statically set the given AD5206 channel 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). If a channel is not specified then it is left
# unconfigured.
#scale:
# This parameter can be used to alter how the 'channel_x' parameters
# are interpreted. If provided, then the 'channel_x' parameters
# should be between 0.0 and 'scale'. This may be useful when the
# AD5206 is used to set stepper voltage references. The 'scale' can
# be set to the equivalent stepper amperage if the AD5206 were at
# its highest resistance, and then the 'channel_x' parameters can be
# specified using the desired amperage value for the stepper. The
# default is to not scale the 'channel_x' parameters.