disable/enable interrupt

By disabling and enabling interrupts, we can create a hard critical section

This is imp

                        taskENTER_CRITICAL();
                        #define taskENTER_CRITICAL()		portENTER_CRITICAL() // task.h
                        #define portENTER_CRITICAL()		vPortEnterCritical() // portmacro.h

                        void vPortEnterCritical( void ) // port.c
                        {
                            portDISABLE_INTERRUPTS();
                            uxCriticalNesting++;

                            /* This is not the interrupt safe version of the enter critical function so
                            assert() if it is being called from an interrupt context.  Only API
                            functions that end in "FromISR" can be used in an interrupt.  Only assert if
                            the critical nesting count is 1 to protect against recursive calls if the
                            assert function also uses a critical section. */
                            if( uxCriticalNesting == 1 )
                            {
                                configASSERT( ( portNVIC_INT_CTRL_REG & portVECTACTIVE_MASK ) == 0 );
                            }
                        }
                        #define portDISABLE_INTERRUPTS()				vPortRaiseBASEPRI() // portmacro.h

                        static portFORCE_INLINE void vPortRaiseBASEPRI( void )  // portmacro.h
                        {
                            uint32_t ulNewBASEPRI = configMAX_SYSCALL_INTERRUPT_PRIORITY; // which is  5 << (8-4) = 0b01010000 = 0x50

                            __asm
                            {
                                /* Set BASEPRI to the max syscall priority to effect a critical
                                section. */
                                msr basepri, ulNewBASEPRI
                                dsb
                                isb
                            }
                        }
                        #define configPRIO_BITS         4   // FreeRTOSConfig.h
                        #define configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY 5
                        #define configMAX_SYSCALL_INTERRUPT_PRIORITY 	( configLIBRARY_MAX_SYSCALL_INTERRUPT_PRIORITY << (8 - configPRIO_BITS) )