xtensa_loadstore_handler.S uses _iram_end to prevent modification of IRAM
code. With the LoadStore exception handler in place, IRAM can also be
used for .bss and .data section. Hence the sanity check should be based
upon _iram_text_end and not _iram_end
+ The idle task decides to enter sleep mode on the following line.
```
if( xExpectedIdleTime >= configEXPECTED_IDLE_TIME_BEFORE_SLEEP )
```
+ The scheduler is suspended, preventing any context switches.
[Potentially a tick interrupt could occur here. That could happen if other tasks executing consumed a lot of time since the above code line executed. If a tick interrupt occurs here the interrupt will be entered but the interrupt will not do anything other than increment xPendedTicks.]
+ The expected idle time is checked again. No context switches can occur now so the code will execute until the scheduler is unsuspended. Assuming configEXPECTED_IDLE_TIME_BEFORE_SLEEP is set to a sensible value, a tick interrupt won't occur for some time.
+ portSUPPRESS_TICKS_AND_SLEEP() is called.
+ The default implementation of the tickless function calls eTaskConfirmSleep() - which prior to this change does not return eAbortSleep even though xPendedTicks is not 0, and after this change does return eAbortSleep.
NOTE: Co-routines are a deprecated feature. This change was made to close off an old ticket as the source control transitions from SourceForge to Github.
Make clock setup functions weak symbols in ARMv8-M ports.
Update Cortex-M33 ports to use an interrupt mask in place of globally disabling interrupts, as per the other Cortex-M ports.
Projects under FreeRTOS-Labs directory are in beta, developers updating projects please make sure you are using the correct version of -CLI -TCP -Trace. If you must edit -CLI -TCP and -Trace, please ensure the copies are synced.
Notes:
- header has version 2.2.0.
- This sync did not bring in ./test directory, though we should.
- New NetworkInterfaces are introduced by this merge.
- Keil compiler support.
- FreeRTOS_IP.h new API xApplicationGetRandomNumber().
- FreeRTOS_IP_Private.h new eIPEvent_t eNetworkTxEvent.
- FreeRTOS_Stream_Buffer.h removing static xStreamBufferIsEmpty() and xStreamBufferIsFull().
- FreeRTOSConfigDefaults.h provides default ipconfigDNS_RECEIVE_BLOCK_TIME_TICKS.
- other type changes.
For projects depending on either of these two ports, please update your projects according to below:
Wiced_CY -- Use GCC/ARM_CRx_No_GIC instead.
nrf52840-dk -- Use GCC/ARM_CM7/r0p1 instead. Please note that, kernel port shall only take dependency on MCU core, not MCU peripherals. (Please take out RTC related from kernel port.) For low power feature (tickless) in FreeRTOS, please follow this page https://www.freertos.org/low-power-ARM-cortex-rtos.html. In case ARM_CM7/rop1 is missing any feature, reach out to us.
- System calls are now only allowed from kernel code. This change can be turned on
or off using configENFORCE_SYSTEM_CALLS_FROM_KERNEL_ONLY.
- MPU is disabled before reprogramming it and enabled afterwards to be compliant
with ARM recommendations.
Added tests for xTaskAbortDelayFromISR() into Demo/Common/Minimal/AbortDelay.c.
Added tests for ulTaskNotifyValueClear() into Demo/Common/Minimal/TaskNotify.c.
- Added back power static library for GCC and IAR. (Power management related interface definitions are in drivers/fsl_power.h. power.c is empty due to "implementation is in header file and power library")
- Note for GCC link: the command used for linking is `arm-none-eabi-gcc -nostdlib -L<additional lib search path> -Xlinker ... -o "CORTEX_M0+_LPC51U68_LPCXpresso.axf" <all *.o> -lpower`. Per GCC doc, static library name in file system is libpower.a.
