51 lines
1.8 KiB
Plaintext
51 lines
1.8 KiB
Plaintext
|
RSEG ICODE:CODE
|
||
|
|
CODE32
|
||
|
|
|
||
|
|
EXTERN vTaskSwitchContext
|
||
|
|
EXTERN vTaskIncrementTick
|
||
|
|
EXTERN vPortPreemptiveTick
|
||
|
|
|
||
|
|
PUBLIC vPortPreemptiveTickEntry
|
||
|
|
PUBLIC vPortYieldProcessor
|
||
|
|
PUBLIC vPortStartFirstTask
|
||
|
|
|
||
|
|
#include "FreeRTOSConfig.h"
|
||
|
|
#include "ISR_Support.h"
|
||
|
|
|
||
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||
|
|
; Starting the first task is just a matter of restoring the context that
|
||
|
|
; was created by pxPortInitialiseStack().
|
||
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||
|
|
vPortStartFirstTask:
|
||
|
|
portRESTORE_CONTEXT
|
||
|
|
|
||
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||
|
|
; Manual context switch function. This is the SWI hander.
|
||
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||
|
|
vPortYieldProcessor:
|
||
|
|
ADD LR, LR, #4 ; Add 4 to the LR to make the LR appear exactly
|
||
|
|
; as if the context was saved during and IRQ
|
||
|
|
; handler.
|
||
|
|
|
||
|
|
portSAVE_CONTEXT ; Save the context of the current task...
|
||
|
|
LDR R0, =vTaskSwitchContext ; before selecting the next task to execute.
|
||
|
|
mov lr, pc
|
||
|
|
BX R0
|
||
|
|
portRESTORE_CONTEXT ; Restore the context of the selected task.
|
||
|
|
|
||
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||
|
|
; Preemptive context switch function. This will only ever get installed if
|
||
|
|
; portUSE_PREEMPTION is set to 1 in portmacro.h.
|
||
|
|
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||
|
|
vPortPreemptiveTickEntry:
|
||
|
|
#if configUSE_PREEMPTION == 1
|
||
|
|
portSAVE_CONTEXT ; Save the context of the current task...
|
||
|
|
LDR R0, =vPortPreemptiveTick; before selecting the next task to execute.
|
||
|
|
mov lr, pc
|
||
|
|
BX R0
|
||
|
|
portRESTORE_CONTEXT ; Restore the context of the selected task.
|
||
|
|
#endif
|
||
|
|
|
||
|
|
END
|
||
|
|
|