drivers/gp8xxx: add initial support #21182
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To add support for voltage and current DACs, add additional SAUL actuators.
The Guestgood GP8xxx I2C DACs are easy-to-use voltage and current DACs with standardized output ranges. All supported variants have very similar I2C protocol. This commit adds support for a generic driver (gp8xxx) and uses a information structure to record capabilities. Multiple driver instances can work simultaneously on the same I2C bus. SAUL support is also added.
These two drivers ensure that a VDAC and IDAC capabilities are included.
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Contribution description
This adds support for the Guestgood GP8xxx I2C voltage and current DACs. The following variations are supported.
Although Guestgood is Chinese and doesn't offer English datasheets, small and well-documented development boards are produced by DFRobot, which are distributed by several known distributors such as Mouser and Digikey.
The 0-10V VDACs had my particular interest, because several home automation appliances can be controlled using 0-10V signals. These single-chip solutions are very ideal for this purpose.
SAUL was extended to support voltage and current actuators.
Testing procedure
A test application is provided in
tests/drivers/gp8xxx. By default, it will select the GP8403, but additional actuators can be specified usingUSEMODULE. I tested the GP8403 and GP8302 only, but the others will probably work out of the box (my driver is largely based on DFRobot's Arduino version).SAUL integration can be tested with
examples/saul. Note that when using this application, the arguments are parsed as Volts or Amperes. Unfortunately, the SAUL shell does not support fractional numbers, so testing the full range is not really possible for the 0-25 mA IDAC.I have created three videos to show the driver in action:
tests/drivers/gp8xxxwith only GP8403tests/drivers/gp8xxxwith both GP8302 + GP8403examples/saulwith both GP8302 + GP8403My test setup:
Issues/PRs references
None