The priority specifies the interrupt priority value, whereby lower values indicate a higher priority. Parameters [in] IRQn Interrupt Number [in] priority Priority to set Remarks The number of priority levels is configurable and depends on the implementation of the chip designer. Refer to Using Interrupt Vector Remap for more information. At the beginning of the vector table, the initial stack value and the exception vectors of the processor are defined. By default, priority group setting is zero. Supports 0 to priority levels. Returns 0 if interrupt is assigned to Secure 1 if interrupt is assigned to Non Secure Remarks Only available for Armv8-M in secure state.

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Set the priority for an interrupt. When you choose to create a CMSIS-based project, the cmis will make a number of modifications to all build configurations of the project that it creates: After making your CMSIS choices, the rest of the project wizard then allows you create startup files, select the build configurations to be created, and finally select the actual target MCU.

This is the highest possible priority. This simply refers to the fact that the code has been written to use the CMSIS way of accessing the peripherals.

The priority level of an interrupt should not be changed after it has been enabled. This function enables the specified device specific interrupt IRQn. Unimplemented bits are read as zero. This Page show changes get info show raw text show print view delete cache attach file check spelling show like pages show local site map.


Interrupts and Exceptions (NVIC)

These interrupt handlers can be used directly in application software without being adapted by the programmer. HardFault and NMI have a fixed negative priority that is higher csis any configurable exception or interrupt.

Parameters [in] IRQn External interrupt number. This function returns the interrupt enable status for the specified device specific interrupt IRQn. This function encodes the priority for an interrupt with the priority group PriorityGrouppreemptive priority value PreemptPriorityand subpriority value SubPriority. All device specific interrupts should have a default interrupt handler function that can be overwritten in user code.

This function allows to change the address of an interrupt handler function. Get Interrupt Target State.

**** Advance Notice ****

Refer to Using Interrupt Vector Remap for more information. This function removes the pending state of the specified device specific interrupt IRQn.

The table below describes the core exception names and their availability in various Cortex-M cores. Disable a device specific interrupt. The number of supported interrupts depends on the implementation of the chip designer and can be read form the Interrupt Controller Type Register ICTR in granularities of Debug Monitor Interrupt [not on Cortex-M0 variants].


Clears the interrupt target field in the non-secure NVIC when in secure state. These overrides allow an operating system to control the access privileges of application code to critical interrupts.

This function decodes an interrupt priority value with the priority group PriorityGroup to preemptive priority lpv pPreemptPriority and subpriority value pSubPriority. This allows, for example, alternate implementations to relocate the vector table from flash to RAM on the first vector table update.

This function returns the pending status of the specified device specific interrupt IRQn.

The function sets the priority grouping PriorityGroup using the required unlock sequence. For more details please see the following FAQs: The default priority is 0 for every interrupt. For example, if the minimum number of 3 bits have been implemented, the read-back value is 0xE0.

The Vector Table defines the entry addresses of the processor exceptions and the device specific interrupts. When cmsos ISR is preempted and the processor executes anohter interrupt handler, the previous interrupt is still defined as active. Sets the interrupt target field in the non-secure NVIC when in secure state. Each Interrupt Priority Level Register is 1-byte wide.