Priority-level registers are 2 bit wide, occupying the two MSBs. The default priority is 0 for every interrupt. The Vector Table defines the entry addresses of the processor exceptions and the device specific interrupts. This function sets the pending bit for the specified device specific interrupt IRQn. CMSIS is intended to enable the combination of software components from multiple middleware vendors. Unimplemented bits are read as zero.
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An interrupt can have the status pending though it is not active. Get Interrupt Target State.
Set Interrupt Target State. Disable a device specific interrupt. Set a device specific interrupt to pending.
**** Advance Notice ****
Bus Fault Interrupt [not on Cortex-M0 variants]. Get a device specific interrupt enable status. For the actual details of the MCU setup, you should read the code supplied in these files in conjunction with the MCU user manual.
Get the priority of an interrupt. IRQn cannot be a negative number. The returned priority value is automatically aligned to the implemented priority bits of the microcontroller. The first device-specific interrupt has the IRQn value 0.
Interrupts and Exceptions (NVIC)
Clear Interrupt Target State. This function sets the pending bit for the specified device specific interrupt IRQn.
Following the processor exception vectors, the vector table contains also the device specific interrupt vectors.
Details of how to do this can be found in the FAQ Using library projects from your own projects. The appropriate CMSIS library project must exist in the workspace your new project is being created in. This function enables the specified device specific interrupt IRQn.
For more details please see the following FAQs: Unimplemented bits are read as zero. Virtualization of interrupt vector table access functions. Refer to Programmers Model cmsiss TrustZone for more information. Each interrupt handler is defined as a weak function to an dummy handler. IRQn can can specify any device specific interrupt, or processor exception.
Positive IRQn values represent device-specific exceptions external interrupts. Sets the priority for the interrupt specified by IRQn. CMSIS is intended to enable the combination of software components from multiple middleware vendors. Usage Fault Interrupt [not on Cortex-M0 variants].
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The table below describes the core exception names and their availability in various Cortex-M cores. The table below lists the core exception vectors of the various Cortex-M processors. Definition of IRQn ccmsis. For example, if the minimum number of 3 bits have been implemented, the read-back value is 0xE0.
This allows, for example, alternate implementations to relocate the lcp table from flash to RAM on the first vector table update. To determine the number of bits implemented for interrupt priority-level registers, write 0xFF to one of the priority-level register, then read back the value. Dynamic switching of interrupt priority levels is not supported.
Each Interrupt Priority Level Register is 1-byte wide.