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imxrt: add support for ADC triggering by an external signal

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Config option IMXRT_ADCx_ETC can now be used to select an external HW
trigger to be used instead of continous trigger. Continous trigger is
used if IMXRT_ADCx_ETC = -1 (default option). Otherwise the source signal
is routed through XBAR and used as a trigger.

Hardware triggering is currently limited to maximum of 8 channels.
HW trigger is automatically disabled if there are more than 8 channels.

The external triggering was tested with PWM signal as a source.

Signed-off-by: Michal Lenc <michallenc@seznam.cz>
This commit is contained in:
Michal Lenc
2022-09-15 19:04:31 +02:00
committed by Xiang Xiao
parent 5a085176fe
commit 9ebd7e525c
4 changed files with 288 additions and 14 deletions
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12
Documentation/platforms/arm/imxrt/index.rst
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@@ -87,6 +87,18 @@ ADC
ADC driver with the successive approximation analog/digital converter. The lower-half of
this driver is initialize by calling :c:func:`imxrt_adcinitialize`.
ADC module can use either continous trigger (next conversion is started as soon as the
previous is finished) or hardware trigger. This option is selected by IMXRT_ADCx_ETC
(x = 1, 2) config option. If IMXRT_ADCx_ETC = -1 then continous trigger is used. If
corresponding XBAR number is put in IMXRT_ADCx_ETC then that signal is used to trigger
the ADC conversion (for example PWM signal can be used as a source). For PWM XBAR options
please refer to PWM chapter of this documentation.
Hardware triggering is currently limited to maximum of 8 channels. HW trigger is automatically
disabled if there are more than 8 channels.
DMA is currently not supported for ADC modules.
CAN
---