5fb0c44f38
1. Enable timer and irq finally to make sure timer callback was already registered. When the CPU resets, the values of some generic timer registers are undefined. Enabling the timer interrupt in advance may cause the timer to trigger early while the timer callback is not yet registered. This results in the timer ISR being executed, which masks the timer interrupt. Since the timer callback is not registered at this point, the timer interrupt is not unmasked, further causing the system scheduler to hang. 2. Remove timer mask for one-shot timer and that's in isr, irq/fiq is disabled. Masking generic timer is not necessary, and it may introduce risks, otherwise, mask/unmask must be pair in all situations. Signed-off-by: Jinliang Li <lijinliang1@lixiang.com>
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.