* minor cleanup of lwip+tinyusb docs, and bump sdk verison number to 1.5.0-develop
* Update cyw43_arch docs for async_context_use
* remove accidental copy of some comments
1. Make sure Pico SDK libraries have the correct dependencies on other SDK libraries
2. Pico SDK libraries all have _headers variants to include the headers. This may facilitate building user STATIC libraries without
pulling in SDK code, though care will still need to be taken w.r.t. values of #defines
3. Make sure the _headers versions also have the correct dependencies
Note: There are a few exceptions to 1. for some non code libraries like pico_standard_link and pico_cxx_options
Add a general purpose random number generator via pico_rand library. which tries to use as much real entropy as possible mixed into a PRNG
Co-authored-by: graham sanderson <graham.sanderson@raspberrypi.com>
* Extract all poll/threadsafe_background/freertos from cyw43_arch into new abstraction async_context:
* provides support for asynchronous events (timers/IRQ notifications) to be handled in a safe context.
* now guarantees all callbacks happen on a single core.
* is reusable by multiple different libraries (stdio_usb can now be ported to this but hasn't been yet).
* supports multiple independent instances (independent instances will not block each other).
* cyw43_arch libraries cleaned up to use the new abstraction. Note each distinct cyw43_arch type is now a very thin layer that creates the right type of context and adds cyw43_driver and lwip support as appropriate.
Additionally,
* Add new pico_time and hardware_alarm APIs
* Add from_us_since_boot()
* Add alarm_pool_create_with_unused_hardware_alarm()
* Add alarm_pool_add_alarm_at_force_in_context()
* Add hardware_alarm_claim_unused()
* Add hardware_alarm_force_irq()
* Added panic_compact() and some minor comment cleanup; moved FIRST_USER_IRQ define to platform_defs.h
* SYS functions and GCC 12 fixes
* Add implementation of _gettimeofday and settimeofday, _times
* Remove some GCC warnings about unimplemented SYS functions (e.g. _open) by making weak implementations that return errors.
* Removed _exit from crt0.S since we have a weak version in runtime.c and we don't want two weak impls since the linker can't pick. If the user omits runtime.c then they'll need to provide _exit or get the error
* Add sys/time.h to arch/cc.h for lwIP as it seems under GCC12 this is not getting included
* Remove incorrect override for LWIP_PLATFORM_ASSERT
LWIP_PLATFORM_ASSERT macro is used by lwip driver implementations to specify the behavior of the assertions in lwip code.
The previous override of this macro incorrectly assumed that the parameter to the function macro was the condition to check. However this is incorrect. The parameter is actually a message string defining what failed.
This mistake caused all assertions to be ignored. ( and myself to loose many hours of debugging time )
By removing this, we restore the default behavior specified by lwip which is to use `printf` to log the message.
* I think i prefer to use panic (which doesn't pull in fflush etc)
Co-authored-by: Graham Sanderson <graham.sanderson@gmail.com>
