nuttx

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Lee Lup Yuen b2c1930825 serial/uart_16550: Wait before setting Line Control Register (Synopsys DesignWare 8250)

Some UART Controllers (Synopsys DesignWare 8250) will trigger spurious interrupts when the Line Control Register (LCR) is set while the UART is busy. This patch provides the option (16550_WAIT_LCR) to wait for UART until it's not busy, before setting the LCR. (16550_WAIT_LCR is disabled by default)

This patch fixes the spurious UART interrupts for the upcoming port of NuttX to StarFive JH7110 SoC (with Synopsys DesignWare 8250 UART). [The patch is explained here](https://lupyuen.github.io/articles/plic#appendix-fix-the-spurious-uart-interrupts)

drivers/serial/uart_16550.c: If 16550_WAIT_LCR is enabled, wait until UART is not busy before setting LCR

include/nuttx/serial/uart_16550.h: Define the UART Status Register (USR) for checking if UART is busy

drivers/serial/Kconfig-16550: Added option 16550_WAIT_LCR to 16550 UART Config, disabled by default

2023-08-03 08:38:07 +02:00

CMakeLists.txt

build: add initial cmake build system

2023-07-08 13:50:48 +08:00

Kconfig

Kconfig: Simplify the conditional default statement

2023-07-16 14:39:20 -03:00

Kconfig-16550

serial/uart_16550: Wait before setting Line Control Register (Synopsys DesignWare 8250)

2023-08-03 08:38:07 +02:00

Kconfig-lpuart

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