There might be multiple expanders, one with interrupt used and other
without. This commit fixes initial incorrect interrupt design by
introducing ICJX_INT_ENABLE config option.
Also fixes naming of ICJX_MULTIPLE option.
Signed-off-by: Michal Lenc <michallenc@seznam.cz>
iC-JX expander has NINT (not interrupt) pin that goes to logical zero
if interrupt occurs. This commit adds support for iC-JX options settings
that allows to enable the interrupt for defined input pins.
The interrupt is handled in HP worker thread to avoid waiting for SPI
transfers in interrupt context. Board has to configure interrupt event
for GPIO pin connected to NINT.
Signed-off-by: Michal Lenc <michallenc@seznam.cz>
This commit implements functions icjx_multireadpin and icjx_multiwritepin.
These functions can be used for multiple pin access (read/write) if
CONFIG_IOEXPANDER_MULTIPIN is selected. This access is generally
faster than one by one pin and may simplify user application.
Changes to general functions icjx_read and icjx_write were also required
to provide support for multiple data send/receive.
Signed-off-by: Michal Lenc <michallenc@seznam.cz>
This commit adds basic support for iC-JX expander in SPI mode. The
expander is functional and supports both input and output pins. Further
expander functionalities (filtering, adc, interrupt support) are not
yet implemented.
Signed-off-by: Michal Lenc <michallenc@seznam.cz>
