len0rd/FreeRTOS-Kernel
1
0
Fork 0
mirror of https://github.com/FreeRTOS/FreeRTOS-Kernel.git synced 2025-09-05 05:43:51 -04:00
Code Issues Projects Releases Packages Wiki Activity

Replace the static prvSetupTimerInterrupt() function in the Cortex-M port layers that still used it (other than MPU ports so far) with a weakly defined function call vPortSetupTimerInterrupt() - which allows application writers to override the function with one that uses a different clock.

Browse source
This commit is contained in:
Richard Barry 2019-12-30 21:16:09 +00:00
parent e23d638afd
commit e292c67933
6 changed files with 68 additions and 49 deletions
Download patch file Download diff file Expand all files Collapse all files

22
FreeRTOS/Source/portable/RVDS/ARM_CM3/port.c
View file

@ -51,11 +51,11 @@
#define portNVIC_SYSTICK_CLK_BIT ( 0 )
#endif
/* The __weak attribute does not work as you might expect with the Keil tools
so the configOVERRIDE_DEFAULT_TICK_CONFIGURATION constant must be set to 1 if
the application writer wants to provide their own implementation of
vPortSetupTimerInterrupt(). Ensure configOVERRIDE_DEFAULT_TICK_CONFIGURATION
is defined. */
/* Legacy macro for backward compatibility only. This macro used to be used to
replace the function that configures the clock used to generate the tick
interrupt (prvSetupTimerInterrupt()), but now the function is declared weak so
the application writer can override it by simply defining a function of the
same name (vApplicationSetupTickInterrupt()). */
#ifndef configOVERRIDE_DEFAULT_TICK_CONFIGURATION
#define configOVERRIDE_DEFAULT_TICK_CONFIGURATION 0
#endif
@ -523,13 +523,13 @@ void xPortSysTickHandler( void )
__disable_irq();
__dsb( portSY_FULL_READ_WRITE );
__isb( portSY_FULL_READ_WRITE );
/* Disable the SysTick clock without reading the
/* Disable the SysTick clock without reading the
portNVIC_SYSTICK_CTRL_REG register to ensure the
portNVIC_SYSTICK_COUNT_FLAG_BIT is not cleared if it is set. Again,
the time the SysTick is stopped for is accounted for as best it can
be, but using the tickless mode will inevitably result in some tiny
drift of the time maintained by the kernel with respect to calendar
portNVIC_SYSTICK_COUNT_FLAG_BIT is not cleared if it is set. Again,
the time the SysTick is stopped for is accounted for as best it can
be, but using the tickless mode will inevitably result in some tiny
drift of the time maintained by the kernel with respect to calendar
time*/
portNVIC_SYSTICK_CTRL_REG = ( portNVIC_SYSTICK_CLK_BIT | portNVIC_SYSTICK_INT_BIT );