dechao_gong
dfc55c9bbe
Add a shared NuttX I2C master lower-half for the Realtek Ameba I2C controllers (I2C0/I2C1) in arch/arm/src/common/ameba, driven through the SDK fwlib in polling mode. Per-chip wiring (controller count, register bases, clock masks, crossbar pad-mux codes and the fwlib I2C_InitTypeDef layout) lives in arch/arm/src/rtl8721dx/ameba_i2c_chip.h so a port to the other Ameba chips only supplies a same-named header. Each controller registers as /dev/i2cN from pke8721daf bring-up through the stock I2C character driver; a dedicated `i2c` defconfig drives the i2ctool for validation. 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()).
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