Interrupt with button

437000534 · ‎11-07-2019

How to do a button interrupt based on S12ZVML12EVB .Is there a isr vector for key or button?Because I can not find it.And I want to apply this to change the duty cycle.I would appreciate it if anyone can give me some tipps.

lama · ‎11-11-2019

There are two push buttons on the oard connected to PP1 and PP2 via jumpers J19 and J20. they are pulled up so interrupt you should implement should be low level value or falling edge.

Port P has interrrupt has interrupt vector 0xFFFF0C [hex] or vector number 60 [dec].

The routine can look, for axample:

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#pragma CODE_SEG NON_BANKED

interrupt void PORTP_ISR( void ) // vector defined in the prm file

{

unsigned int i, j;

unsigned char status;

status = PIFP; // store PIFP

PIFP = 0xFF; // clear all port P flags

if( ( PIEP & PIEP_PIEP1_MASK ) && ( status & PIFP_PIFP1_MASK ) ) // PTP1 interrupt

{ // do something if necessary

}

if( ( PIEP & PIEP_PIEP2_MASK ) && ( status & PIFP_PIFP2_MASK ) ) // PTP2 interrupt

{

// do something if necessary

}

#pragma CODE_SEG DEFAULT

….and setup for example:

//=== PORT P SETUP FOR FALLING EDGE INTERRUTP ===

DDRP_DDRP1 = 0; // input pin

PERP_PERP1 = 1; // pull device enabled

PPSP_PPSP1 = 0; // pull up device, falling edge selected

PIFP_PIFP1 = 1; // clear flag

PIEP_PIEP1 = 1; // enable interrupt

DDRP_DDRP2 = 0; // input pin

PERP_PERP2 = 1; // pull device enabled

PPSP_PPSP2 = 0; // pull up device, falling edge selected

PIFP_PIFP2 = 1; // clear flag

PIEP_PIEP2 = 1; // enable interrupt

…..and global enable of interrupts

//=== ENABLE INTERRUPTS ========

EnableIinterrupts; // or asm CLI

There are two possible ways of interrupt definition. Either by definition of vector function in the PRM file, which is used in above mentioned code....

VECTOR 0 _Startup /* reset vector: this is the default entry point for a C/C++ application. */
//VECTOR 0 Entry /* reset vector: this is the default entry point for an Assembly application. */
//INIT Entry /* for assembly applications: that this is as well the initialization entry point */

VECTOR   1   SPARE_ISR
VECTOR   2   TRAP_ISR
VECTOR   3   SWI_ISR
VECTOR   4   SYS_ISR
VECTOR   5   MachineException_ISR
VECTOR   6   Dummy_6_ISR
VECTOR   7   Dummy_7_ISR
VECTOR   8   Spurious_ISR
VECTOR   9   XIRQ_ISR
VECTOR 10   IRQ_ISR
VECTOR 11   RTI_TimeOut_ISR
VECTOR 12   TIM0_Channel0_ISR
VECTOR 13   TIM0_Channel1_ISR
VECTOR 14   TIM0_Channel2_ISR
VECTOR 15   TIM0_Channel3_ISR
VECTOR 16   Dummy_16_ISR
VECTOR 17   Dummy_17_ISR
VECTOR 18   Dummy_18_ISR
VECTOR 19   Dummy_19_ISR
VECTOR 20   TIM0_Overflow_ISR
VECTOR 21   Dummy_21_ISR
VECTOR 22   Dummy_22_ISR
VECTOR 23   SPI0_ISR
VECTOR 24   SCI0_ISR
VECTOR 25   SCI1_ISR
VECTOR 26   Dummy_26_ISR
VECTOR 27   Dummy_27_ISR
VECTOR 28   ADC0_Error_ISR
VECTOR 29   ADC0_ConversionSequenceAbort_ISR
VECTOR 30   ADC0_ConversionComplete_ISR
VECTOR 31   OSCILLATOR_Status_ISR
VECTOR 32   PLL_Lock_ISR
VECTOR 33   Dummy_33_ISR
VECTOR 34   Dummy_34_ISR
VECTOR 35   RAM_Error_ISR
VECTOR 36   Dummy_36_ISR
VECTOR 37   Dummy_37_ISR
VECTOR 38   FLASH_Error_ISR
VECTOR 39   FLASH_Command_ISR
VECTOR 40   CAN0_WakeUp_ISR
VECTOR 41   CAN0_Errors_ISR
VECTOR 42   CAN0_Receive_ISR
VECTOR 43   CAN0_Transmit_ISR
VECTOR 44   Dummy_44_ISR
VECTOR 45   Dummy_45_ISR
VECTOR 46   LINPHY_OverCurrent_ISR
VECTOR 47   BATS_SupplyVoltageMonitor_ISR
VECTOR 48   GDU_DesaturationError_ISR
VECTOR 49   GDU_VoltageLimitDetected_ISR
VECTOR 50   Dummy_50_ISR
VECTOR 51   Dummy_51_ISR
VECTOR 52   Dummy_52_ISR
VECTOR 53   Dummy_53_ISR
VECTOR 54   PORTS_ISR
VECTOR 55   Dummy_55_ISR
VECTOR 56   ADC1_Error_ISR
VECTOR 57   ADC1_ConversionSequenceAbort_ISR
VECTOR 58   ADC1_ConversionComplete_ISR
VECTOR 59   Dummy_59_ISR
VECTOR 60   PORTP_ISR
VECTOR 61   EVDD1_OverCurrent_ISR
VECTOR 62   LVI_ISR
VECTOR 63   API_ISR
VECTOR 64   HighTemperature_ISR
VECTOR 65   Dummy_65_ISR
VECTOR 66   PortAD_ISR
VECTOR 67   PTU_ReloadOverrun_ISR
VECTOR 68   PTU_Trigger0Error_ISR
VECTOR 69   PTU_Trigger1Error_ISR
VECTOR 70   PTU_Trigger0Done_ISR
VECTOR 71   PTU_Trigger1Done_ISR
VECTOR 72   Dummy_72_ISR
VECTOR 73   Dummy_73_ISR
VECTOR 74   Dummy_74_ISR
VECTOR 75   PMF_ReloadA_ISR
VECTOR 76   PMF_ReloadB_ISR
VECTOR 77   PMF_ReloadC_ISR
VECTOR 78   PMF_Fault_ISR
VECTOR 79   PMF_Reload_overrun_ISR

....or simply: