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drivers: adc: add ADC emulator

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ADC emulator is designed to be used in tests on native_posix board. It
supports 1-16 bit resolution range and all GAINs from enum adc_gain.
Reference voltages and number of emulated channels are set through dts.
Using special API from drivers/adc/adc_emul.h it is possible to set
constant voltage value returned by given ADC channel or set custom
function which allows to simulate complex output.
Also reference voltages can be changed in runtime using the API.

The CL also includes:
- Add adc definitions of ADC emulator in
  tests/drivers/adc/adc_api/src/test_adc.c for supporting test suites.
- Add test for ADC emulator API in tests/drivers/adc/adc_emul/

Signed-off-by: Tomasz Michalec <tm@semihalf.com>
This commit is contained in:
Tomasz Michalec 2021-04-15 14:27:34 +02:00 • committed by Carles Cufí
commit d83647dea6
19 changed files with 1505 additions and 0 deletions
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2
drivers/adc/adc_shell.c
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@ -33,6 +33,8 @@
#define DT_DRV_COMPAT nuvoton_npcx_adc
#elif DT_HAS_COMPAT_STATUS_OKAY(ti_cc32xx_adc)
#define DT_DRV_COMPAT ti_cc32xx_adc
#elif DT_HAS_COMPAT_STATUS_OKAY(zephyr_adc_emul)
#define DT_DRV_COMPAT zephyr_adc_emul
#else
#error No known devicetree compatible match for ADC shell
#endif