Jiri Vlasak
7f5e0285a8
When a developer working on BSP wants UART1 with RTS, the following needs to be added in the BSP's include/board.h file: #define PIN_UART1_RTS PIN_UART1_RTS_1 which says that PIN_UART1_RTS_1 -- the first alternative pin with UART1 RTS function -- should be used for the UART1's RTS. There are no alternative pins for PIN_UART2_RTS, therefore a similar definition is not used for PIN_UART2_RTS. However, that is a complication when we want PIN_UART2_RTS to be defined as GPIO, for example: #define PIN_UART2_RTS (GPIO_OUTPUT | PIN_PORTB | PIN2) In such a case, PIN_UART2_RTS is later redefined to the only alternative function from hardware/kinetis_???pinmux.h file. This patch avoids the redefinition of already defined names. We considered renaming PIN_UART2_RTS to PIN_UART2_RTS_1 in the hardware/kinetis_???pinmux.h file, but that is breaking change. We try to avoid breaking change. Signed-off-by: Jiri Vlasak <jvlasak@elektroline.cz>
Apache NuttX is a real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 64-bit microcontroller environments, the primary governing standards in NuttX are POSIX and ANSI standards. Additional standard APIs from Unix and other common RTOSs (such as VxWorks) are adopted for functionality not available under these standards, or for functionality that is not appropriate for deeply-embedded environments (such as fork()).
For brevity, many parts of the documentation will refer to Apache NuttX as simply NuttX.
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