Fixes#1439
Use a real FreeRTOS task, at the highest priority, to idle the other core
while doing flash accesses.
The USB stack seems to have some timing dependent bits which get broken
if FreeRTOS switches out the current task when it's running. Avoid any
issue by disabling preemption on the core for all tud_task calls.
The PendSV handler disable flag can live completely inside the FreeRTOS
variant port, so remove any reference to it in the main core.
Tested using Multicode-FreeRTOS, #1402 and #1441
The USB FIFO interrupts were still being serviced even when the core was
frozen, leading to crashes. Explicitly shut off IRQs on both the victim
and the initiator core when freezing.
Removed the need for hack __holdUpPendSV flag
Fixes#1402
The global USB mutex is auto-shadowed with a FreeRTOS semaphore while in
FreeRTOS mode. Unfortunately, while the core was using the proper
FreeRTOS semaphore to lock access to the USB port, the actual FreeRTOS
USB task was using the naked Pico SDK mutex, leading to cases where it
could acquire the mutex even though some other FreeRTOS task actually
owned the shadowed mutex.
Properly lock the shadowed Semaphore, not mutex_t, in the FreeRTOS
USB periodic task.
Fixes#795
Replace all CoreMutex and Newlib mutex accesses with FreeRTOS calls
when in FreeRTOS mode. Avoid issues with hange/etc. due to priority
inversion.
No changes to normal operating mode.
Add a FreeRTOS stress test that caught the issue fixed here.
Adds a 12K OTA stub 3rd stage bootloader, which reads new firmware
from the LittleFS filesystem and flashes on reboot.
By storing the OTA commands in a file in flash, it is possible to
recover from a power failure during OTA programming. On power
resume, the OTA block will simply re-program from the beginning.
Support cryptographic signed OTA updates, if desired. Includes
host-side signing logic via openssl.
Add PicoOTA library which encapsulates the file format for
the updater, including CRC32 checking.
Add LEAmDNS support to allow Arduino IDE discovery
Add ArduinoOTA class for IDE uploads
Add MD5Builder class
Add Updater class which supports writing and validating
cryptographically signed binaries from any source (http,
Ethernet, WiFi, Serial, etc.)
Add documentation and readmes.
FreeRTOS SMP was updated to:
a) Move ths SYSTICK handler, which cannot be disabled and can fire
even with IRQs disabled, to RAM
b) Add a flag from the core to the SYSTICK handler to hold off on
any PendSV (task switch) calls while we are doing the idleOtherCore.
The core now sets this flag, _holdPendSV, and adds add'l FreeRTOS SMP
calls to really, really tell the OS we can't, don't, and better not
be swapped out while writing to flash.
Fixes#719
Instead of wrapping the memory functions in the link stage, rebuild
Newlib and enable retargetable locks. Override the weak definitions
in the libc.a with our own, SDK based ones.
The wrapping utilized before catches app-level memory allocations
but misses allocations inside Newlib libc (like printf/etc.).
Each core needs its own _impure_ptr or else crashes like the one seen
in parallel printf_floats can happen. Enable it in the toolchain
build and implement a simple swapper here.
FreeRTOS SMP doesn't support Newlib's dynamic reent which is needed
to allow save MT support. Minor patch to FreeRTOS and update the
FreeRTOS variant.cpp and setup to support it.
Use low power WFE when idle.
Set PORT.C to built `-O0` always because it seems to occasinally end
up with interrupts disabled in task code, causing the SYSTICK never to
fire and killing task switching.
No need for dynamic exceptions. We don't move the execbase.
Using all the work from @hfellner and others, add FreeRTOS
SMP support.
Allow idling cores through the FreeRTOS FIFO queue to
allow for file system and EEPROM support.
Make delay a weak function so FreeRTOS can override.
Add cycle count support under FreeRTOS using a PIO SM.
Use a task-based approach for handling the USB periodic work
instead of the IRQ-based one in the main core.
Set 8 prio levels so it fits in 3 bits nicely (0..7).
Earle F. Philhower, III