Value cannot be negative. Writes to unimplemented bits are ignored. What does the Project Wizard actually do? The CMSIS library project may already exist in the workspace if you have imported appropriate example projects. For example, if the minimum number of 3 bits have been implemented, the read-back value is 0xE0. IRQn cannot be a negative number. IRQn can can specify any device specific interrupt, or processor exception.

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The returned priority value is automatically aligned to the implemented priority bits of the microcontroller.

CMSIS support in LPCXpresso IDE

This function sets the pending bit for the specified device specific interrupt IRQn. Positive IRQn values represent device-specific exceptions external interrupts. For more details please see the following FAQs: HardFault and NMI have a fixed lpcc priority that is higher than any configurable exception or interrupt.

Priority-level registers have a l;c width of 8 bits and a minumum of 3 bits. Get the priority of an interrupt. The priority specifies the interrupt priority value, whereby lower values indicate a higher priority.

Some example code and driver libraries do have the word CMSIS in their titles though, which sometimes causes confusion.


Details of how to do this can be found in the FAQ Using library projects from your own projects. This function removes the pending state of the specified device specific interrupt IRQn. Each Interrupt Priority Level Register is 1-byte wide.

The file must be adapted by the silicon vendor to include interrupt vectors for all device-specific interrupt handlers. All device specific interrupts should have a default interrupt handler function that can be overwritten in user code. Unimplemented bits are read as zero. This function returns the interrupt enable status for the specified device specific interrupt IRQn. Parameters [in] IRQn External interrupt number. 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.

At the beginning of the vector table, the initial stack value and the exception vectors of the processor are defined.

LPC Archived Files | NXP Community

Following the processor exception vectors, the vector table contains also the device specific interrupt vectors. Peripheral drivers will be provided through example code or peripheral driver libraries, typically cmeis by the MCU vendor. The table below lists the core exception vectors of the various Cortex-M processors. Clears the interrupt target field in the non-secure NVIC when in secure state. This function decodes an interrupt priority value with the priority group PriorityGroup to preemptive priority value pPreemptPriority and subpriority cmsls pSubPriority.


For example, if the minimum number of 3 bits have been implemented, the read-back value is 0xE0. Value cannot be negative. This is the highest possible priority. This function allows to read the address of an interrupt handler function. Debug Monitor Interrupt [not on Lpd variants].

Memory Management Interrupt [not on Cortex-M0 variants].

Interrupts and Exceptions (NVIC)

Definition of IRQn numbers. The table below describes the core exception names and their availability in various Cortex-M cores. The vector table below shows the exception vectors of a Armv8-M Mainline processor.

A common way to access peripheral registers and a common way to define exception vectors. Other processor variants may have fewer vectors.

Sets the priority for the interrupt specified by IRQn. By default, priority group setting is zero.