dechao_gong
18d2ae253c
Wire the shared common UART driver (arch/arm/src/common/ameba/ameba_uart.c) into RTL8720F. Add an ameba_uart_chip.h supplying the per-chip UART parameters: two general-purpose controllers (UART0/UART1), their non-secure register bases (0x401C3000 / 0x401C4000 -- the fwlib UART_DEV_TABLE points at the non-secure alias), NVIC vectors, APBPeriph function/clock masks and the crossbar TX/RX pad-mux function codes. The fwlib ROM UART routines index data tables (UART_DEV_TABLE, APBPeriph_UARTx) that live in fwlib ram_common/ameba_uart.c, so that source is compiled in when CONFIG_AMEBA_UART is set. Wire CONFIG_AMEBA_UART into Make.defs/CMakeLists/ameba_board.mk, add the board port table (UART0 at /dev/ttyS1, PA22 TX / PA23 RX, 115200 8N1) with bringup registration, a uart config and board documentation. Hardware-verified on rtl8720f_evb: serialrx/serialblaster over a PA22-to-PA23 TX/RX loopback transferred all 2600 bytes intact. Assisted-by: Claude <noreply@anthropic.com> Signed-off-by: dechao_gong <dechao_gong@realsil.com.cn>
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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