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          uC/OSII移植步驟

          作者: 時間:2016-10-08 來源:網(wǎng)絡 收藏
          ; Pop new task's CPSR
          MSRSPSR_cxsf, R4
          LDMFDSP!, {R0-R12,LR,PC}^; Pop new task's context
          RSEG CODE:CODE:NOROOT(2)
          CODE32
          OS_CPU_FIQ_ISR
          STMFDSP!, {R1-R3}; PUSH WORKING REGISTERS ONTO FIQ STACK
          MOVR1, SP; SaveFIQ stack pointer
          ADDSP, SP,#12; Adjust FIQ stack pointer
          SUBR2, LR,#4; Adjust PC for return address to task
          MRSR3, SPSR; Copy SPSR (i.e. interrupted task's CPSR) to R3
          MSRCPSR_c, #(NO_INT | SVC32_MODE) ; Change to SVC mode


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