drivers: serial: uart_xlnx_ps: Fix interrupt mode issues
This driver had some issues with interrupt-driven operation, which
manifested by the console breaking when enabling the Zephyr shell on the
kv260_r5 target for example. Fixed the following:
-Ensure device is fully hardware reset during initialization
-Changed poll_out to be more consistent with other drivers, i.e. only
wait for the UART to accept the character, not for it to be fully
transmitted.
-Added implementation for err_check function, as otherwise there was no
way to detect or clear the error interrupts enabled by irq_err_enable.
-Fixed logic for enabling/disabling interrupts. This should only be done
by explicit enable/disable calls, not as part of fifo_fill etc.
-This hardware does not produce interrupts for TX FIFO empty or RX FIFO
threshold when enabling them if the TX FIFO is already empty or RX FIFO
already contains data. When enabling interrupts in these cases, use a
timer to trigger a user callback to match the normal UART API usage,
similar to the xlnx_uartlite driver.
-Other minor cleanups to interrupt-driven functions.
Signed-off-by: Robert Hancock <robert.hancock@calian.com>
1 file changed
