dcgong2917 opened a new pull request, #19780:
URL: https://github.com/apache/nuttx/pull/19780
## Summary
Adds a shared NuttX I2C master lower-half for the Realtek Ameba I2C
controllers (I2C0/I2C1) under arch/arm/src/common/ameba, driven through
the SDK fwlib DesignWare block in polling mode. Per-chip wiring
(controller count, non-secure register bases, APB clock masks, crossbar
pad-mux codes and the fwlib I2C_InitTypeDef layout) is isolated in a
per-chip ameba_i2c_chip.h, so each SoC only supplies a same-named header.
Two commits:
- arch/arm/rtl8721dx: add shared Ameba I2C driver — introduces the common
driver + RTL8721Dx chip header + pke8721daf board glue + `i2c` defconfig.
- arch/arm/rtl8721f: add I2C master driver support — wires the same shared
driver into the RTL8721F (amebagreen2) build via its chip header + EVB
board glue + `i2c` defconfig (no change to the shared driver).
Each controller registers at /dev/i2cN and is exercised with the
system/i2c i2ctool.
## Impact
New optional feature (CONFIG_AMEBA_I2C, default n); no impact when
disabled. Touches only arch/arm/src/common/ameba, arch/arm/src/rtl8721dx,
arch/arm/src/rtl8721f, their boards, and one nxstyle whitelist entry.
## Testing
Verified end-to-end on RTL8721F EVB hardware against a second Ameba board
acting as an I2C slave: 7-bit address ACK, register write and read-back
over repeated-START, and full bus scan all pass on I2C0 (PA22/PA23).
Also validated on RTL8721Dx (pke8721daf): SS/FS 100k/400k, 8/16-bit
register access, both I2C0 and I2C1. checkpatch (`tools/checkpatch.sh -g`)
passes clean on both commits.
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