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Update port.c

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Simon Beaudoin 2020-07-19 22:23:23 -04:00 • committed by GitHub
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portable/GCC/ARM_CR5/port.c
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@ -514,7 +514,7 @@ uint32_t ulPortSetInterruptMask( void )
* and 'vPortClearInterruptMask'. At the time of calling those functions, the interrupt mask is not set in the interrupt controller, thus the only protecting barrier * and 'vPortClearInterruptMask'. At the time of calling those functions, the interrupt mask is not set in the interrupt controller, thus the only protecting barrier
* against the CPU traping into recursive interrupt was the IRQ Enable bit in the CPSR. By not taking it into acount, the very code that protects the CPU against * against the CPU traping into recursive interrupt was the IRQ Enable bit in the CPSR. By not taking it into acount, the very code that protects the CPU against
* critical section violation just enabled it to happen : A SysTick was waiting to happen, and calling 'portCPU_IRQ_ENABLE' would enable it to occur... Thus triggering a * critical section violation just enabled it to happen : A SysTick was waiting to happen, and calling 'portCPU_IRQ_ENABLE' would enable it to occur... Thus triggering a
* switch of context while already performing a switch context. / * switch of context while already performing a switch context. */
if(!wasIRQDisabled) if(!wasIRQDisabled)
portCPU_IRQ_ENABLE(); portCPU_IRQ_ENABLE();