jnaulet/picortos

Very small, lightning fast, yet portable RTOS with SMP suppport

picortos's Issues

Support for memory protection via MPU

Add support for MPU without making picoRTOS look like yet another iteration of UNIX

Add main stack to AVR and C2000 architectures

At the moment these architectures rely on slightly bigger task stacks to handle the scheduler overhead. This is not correct we should swap stacks the way arm and ppc do when under interrupt

Find a better structure for PPC arch

PPC e200 arch directory is kinda messy, find a better one that keeps the selection easy

Find an elegant way to disable interrupt support

We want to be able to disable interrupt support in v1.5.x to save on RAM.
We have to find an elegant way of doing it without having to put ifdefs up to the assembly files.

Replace picoRTOS_size_t by size_t

Coding rules forbid the redefinition of already existing types

Use stdint types in the scheduler

stdint, stddef and stdbool are now used all over the place so it doesn't make sense anymore to avoid using them in the scheduler ports.
Using the "fast" types whenever possible would ensure things stay optimal.

documentation: document the HAL properly

HAL should be documented clearly, explaining its role and limitations

Add drivers HAL and library

It might be a good idea to add support for drivers and a corresponding HAL that would make the system more portable and readily useful for the user

Create an eclipse plug-in for tasks statistics

We have to create an eclipse plug-in that can stop the debugger on picoRTOS.tick++ to extract reliable statistics about tasks and display them in a user-friendly way. Help needed here.

Add /*@unused@*/ in front of optional calls

Support for PPC E200 FPU

Add support for PPC e200 FPU (configurable ?)

Separate the port API from the public API

Port API scope should be reduced to avoid accidental misuse

All the arch_ functions should be inaccessible to the user except arch_assert eventually

PicoRTOS_tick and picoRTOS_switch_context should be hidden for the same reasons

Make user-friendly configuration

Add some user friendly interface similar to make menuconfig to allow easy setup of picoRTOS for all platforms.
Lots of challenges here as it should be able to generate a complete package including makefile & cmakefiles that can be used in any environment.

Find an easy way to create devices description files

It might be handy to have device description files that would make bringups easier.
The less files dependencies, the better for the user.

Mabe provide include Makefiles (not universal), a smart directory structure or something.

Stats: add CPU consumption gauge

Find a way to compute the ratio of CPU running/idling to get an idea of how much CPU power is available.
Make it easy to read with a debugger.

This will probably require a change in the way arch_idle is handled.

Add support for interrupt management

Despite the fact picoRTOS is not an interrupt driven system, adding some support can help in some rare cases.
These interrupts should not be out of context, though

Unwanted behaviour of picoRTOS_sleep_until on overrun

If the tick + period overruns, the function will just yield instead of waiting the correct amount of ticks

Merge idle task

The idle task is out of the task list in the core structure.
It is accessed by overrunning the table by 1 and this is seriously misleading IMO.

API: add picoRTOS_join function

Add a join function similar to posix pthread_join

Turn on caches on all cores in SMP (ppc)

Turn on caches in SMP if required