The user can now request the chip select to remain active after the current
transfer. In order to do so, he MUST acquire the bus first with `spi_device_acquire_bus()`
function, else, an error is returned.
Issue Description:
If master is in HD mode, if it sends data without receiving data, it will
still enable the RX DMA because of old version ESP32 silicon issue. And
because there is no correctly linked RX DMA descriptor, an
``inlink_dscr_error`` intr will be seen, which will influence the
following RX transactions.
Solution:
Trigge this workaround only in FD mode.
TODO:
Add a test to check if this workaround related issue does exit. If so,
reporting to Digital Team is also needed.
This commit seperates the hal context into different configuration
structures based on their members' definitions. Through refactoring
spi_master.c, the device related configuration should be passed in and
set each time before a new transaction. The transaction related
configuration now is a local variable in case of the fact that error
occurs without any notice when user forgets to pass new transaction
configuration in (which means the old driver will use the trans_config
that is saved from last transaction).
Besides, via above refactor, this commit fixs a bug which leads to
wrong cs polarity setting.
Closes https://github.com/espressif/esp-idf/pull/5490
Moreover, via above refactor, this commit also fixs a bug about duplex
mode switching when multiple devices are added to the bus.
Closes https://github.com/espressif/esp-idf/issues/4641
Armando