midware_interrupt_manager.c

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// Framework Includes
#include <driver_cpuctrl.h>
#include <driver_cpuint.h>
#include <midware_interrupt_manager.h>
 
// Device-specific Includes
#include <xc.h>
 
void MW_SetIntVectorLocation(bool expectAltLoc)
{
    uint8_t altVectLocMask = (uint8_t)CPUINT_IVSEL_bm;
    if (expectAltLoc)
    {
        CPUINT_SetControlA(altVectLocMask);
    }
    else
    {
        CPUINT_ClearControlA(altVectLocMask);
    }
}
 
errFlag_t MW_SetIntPriority(bool useRoundRobin, uint8_t altStartVect, uint8_t highPriorityVect)
{
    /* Intentional misra-c2012-10.8 deviation */
    const uint8_t allVectSize    = (uint8_t)_VECTORS_SIZE;
    const uint8_t singleVectSize = (uint8_t)_VECTOR_SIZE;
    const uint8_t maxVectNumber  = (allVectSize / singleVectSize) - 1U;
 
    // Assumes a continuous list of valid vector numbers up until the maximum
    bool invalidAltStartVect     = (altStartVect > maxVectNumber);
    bool invalidHighPriorityVect = (highPriorityVect > maxVectNumber);
    bool isVectorsInvalid        = (invalidAltStartVect || invalidHighPriorityVect);
 
    if (isVectorsInvalid)
    {
        /* cppcheck-suppress misra-c2012-15.5 */
        return ERROR;
    }
 
    uint8_t roundRobinMask = (uint8_t)CPUINT_LVL0RR_bm;
    if (useRoundRobin)
    {
        CPUINT_SetControlA(roundRobinMask);
    }
    else
    {
        CPUINT_ClearControlA(roundRobinMask);
    }
 
    CPUINT_WriteIntPriority0(altStartVect);
 
    CPUINT_WriteIntPriority1(highPriorityVect);
 
    return NO_ERROR;
}
 
errFlag_t MW_EnableGlobalInterrupts(void)
{
    const uint8_t gieBitmask = (uint8_t)CPU_I_bm; // Global Interrupt Enable status bit
    CPUCTRL_SetStatusRegister(gieBitmask);
 
    uint8_t regVal   = CPUCTRL_ReadStatusRegister();
    bool writeFailed = ((regVal & gieBitmask) != gieBitmask);
 
    errFlag_t flag = NO_ERROR;
    if (writeFailed)
    {
        flag = ERROR;
    }
    return flag;
}
 
void MW_DisableGlobalInterrupts(void)
{
    CPUCTRL_ClearStatusRegister((uint8_t)CPU_I_bm);
}