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@ -136,7 +136,7 @@ is defined. */
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/* Constants required to set up the initial stack. */
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#define portINITIAL_XPSR ( 0x01000000 )
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#define portINITIAL_EXEC_RETURN ( 0xfffffffd )
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#define portINITIAL_EXC_RETURN ( 0xfffffffd )
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/* The systick is a 24-bit counter. */
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#define portMAX_24_BIT_NUMBER ( 0xffffffUL )
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@ -246,7 +246,7 @@ StackType_t *pxPortInitialiseStack( StackType_t *pxTopOfStack, TaskFunction_t px
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/* A save method is being used that requires each task to maintain its
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own exec return value. */
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pxTopOfStack--;
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*pxTopOfStack = portINITIAL_EXEC_RETURN;
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*pxTopOfStack = portINITIAL_EXC_RETURN;
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pxTopOfStack -= 8; /* R11, R10, R9, R8, R7, R6, R5 and R4. */
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@ -487,7 +487,7 @@ __asm void xPortPendSVHandler( void )
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/* Save the new top of stack into the first member of the TCB. */
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str r0, [r2]
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stmdb sp!, {r3}
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stmdb sp!, {r0, r3}
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mov r0, #configMAX_SYSCALL_INTERRUPT_PRIORITY
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cpsid i
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msr basepri, r0
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@ -497,7 +497,7 @@ __asm void xPortPendSVHandler( void )
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bl vTaskSwitchContext
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mov r0, #0
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msr basepri, r0
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ldmia sp!, {r3}
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ldmia sp!, {r0, r3}
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/* The first item in pxCurrentTCB is the task top of stack. */
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ldr r1, [r3]
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@ -641,13 +641,13 @@ void xPortSysTickHandler( void )
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__disable_irq();
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__dsb( portSY_FULL_READ_WRITE );
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__isb( portSY_FULL_READ_WRITE );
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/* Disable the SysTick clock without reading the
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/* Disable the SysTick clock without reading the
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portNVIC_SYSTICK_CTRL_REG register to ensure the
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portNVIC_SYSTICK_COUNT_FLAG_BIT is not cleared if it is set. Again,
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the time the SysTick is stopped for is accounted for as best it can
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be, but using the tickless mode will inevitably result in some tiny
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drift of the time maintained by the kernel with respect to calendar
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portNVIC_SYSTICK_COUNT_FLAG_BIT is not cleared if it is set. Again,
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the time the SysTick is stopped for is accounted for as best it can
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be, but using the tickless mode will inevitably result in some tiny
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drift of the time maintained by the kernel with respect to calendar
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time*/
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portNVIC_SYSTICK_CTRL_REG = ( portNVIC_SYSTICK_CLK_BIT | portNVIC_SYSTICK_INT_BIT );
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Richard Barry
8 years ago