6f2e17c113
Add a shared NuttX PWM lower-half for the Realtek Ameba PWM timer in arch/arm/src/common/ameba, driven through the SDK fwlib. TIM8 provides a single time base feeding eight compare channels (CCR0..CCR7) that share one frequency while each carries its own duty, so a single /dev/pwm0 exposes the multichannel output via CONFIG_PWM_NCHANNELS. The fwlib PWM routines are split ROM/RAM: the time-base calls resolve from on-chip ROM, while the capture/compare calls live in fwlib ram_common/ameba_tim.c, which the build pulls into AMEBA_FWLIB_SRCS when CONFIG_AMEBA_PWM is set. Per-chip wiring (timer index, channel count, register base, input clock, IRQ, clock masks and the crossbar pad-mux code table) lives in arch/arm/src/rtl8721dx/ameba_pwm_chip.h so a port to another Ameba chip only supplies a same-named header; the pad-mux codes are a per-channel table (AMEBA_PWM_PINMUX_FIDS) rather than a computed base, so chips with a single shared code or codes grouped per timer are expressed by the header alone. The timer registers as /dev/pwm0 from pke8721daf bring-up through the stock PWM character driver; a dedicated `pwm` defconfig drives examples/pwm for validation. Signed-off-by: dechao_gong <dechao_gong@realsil.com.cn> Assisted-by: Claude <noreply@anthropic.com> |
||
|---|---|---|
| .github | ||
| arch | ||
| audio | ||
| binfmt | ||
| boards | ||
| cmake | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| dummy | ||
| fs | ||
| graphics | ||
| include | ||
| libs | ||
| mm | ||
| net | ||
| openamp | ||
| pass1 | ||
| sched | ||
| syscall | ||
| tools | ||
| video | ||
| wireless | ||
| .asf.yaml | ||
| .codespell-ignore-lines | ||
| .codespellrc | ||
| .editorconfig | ||
| .gitignore | ||
| .gitmessage | ||
| .pre-commit-config.yaml | ||
| .yamllint | ||
| AUTHORS | ||
| CMakeLists.txt | ||
| CONTRIBUTING.md | ||
| INVIOLABLES.md | ||
| Kconfig | ||
| LICENSE | ||
| Makefile | ||
| NOTICE | ||
| README.md | ||
| ReleaseNotes | ||
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.
Getting Started
First time on NuttX? Read the Getting Started guide! If you don't have a board available, NuttX has its own simulator that you can run on terminal.
Documentation
You can find the current NuttX documentation on the Documentation Page.
Alternatively, you can build the documentation yourself by following the Documentation Build Instructions.
The old NuttX documentation is still available in the Apache wiki.
Supported Boards
NuttX supports a wide variety of platforms. See the full list on the Supported Platforms page.
Contributing
If you wish to contribute to the NuttX project, read the Contributing guidelines for information on Git usage, coding standard, workflow and the NuttX principles.
License
The code in this repository is under either the Apache 2 license, or a license compatible with the Apache 2 license. See the License Page for more information.