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The console divisor was computed from 198144000, a figure with no source in the manual, the vendor tree or Linux, all of which give the low speed peripheral clock as 200 MHz. The clock tree now reports lsp_uart0_pclk at 200 MHz, and section 12.4.3.2 makes that clock the UART's baud reference. Also enable the fractional divisor. These are DesignWare UARTs with DLF implemented, four bits wide at offset 0xc0, which is where UART_DLF_OFFSET lands once scaled by this board's register increment. Section 12.4.3.2 works the same example at the same 200 MHz. At 115200 the error goes from 1.41% to 0.006%. The old figure with the old divisor was tolerable; the margin only gets worse at higher rates. DEBUG_CLK and DEBUG_CLK_ERROR are enabled so a clock that fails to register is reported. Assisted-by: Claude:claude-opus-5 Signed-off-by: Justin Hammond <justin@dynam.ac> |
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| dummy | ||
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| CONTRIBUTING.md | ||
| INVIOLABLES.md | ||
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| 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.