Instant Interrupts - Revisited

[Darrel Taylor]

Is that possible to use the Instant Interrupts to create/read, let´s say, 4 different buttons on PORTC ?

Yes, that's possible. But it would be a lot easier if you used RBC_INT "Port B change interrupts". It uses PORTB.4 thru PORTB.7

But if those pins aren't available, you could do something like this, which uses only 1 interrupt (INT_INT on Falling Edge), then the interrupt handler can read PORTC to figure out which one was pressed.


<br>

[srspinho]

Hi Darrel

Thank you very Much !

I think this could help me a Lot !

I´m already using some portb pins and this solution will help a lot !

Thank you again !

Sérgio

[duncan303]

Hi Darrel,

I have been using your wonderful instant interrupts routine, i have experienced a hiccup and cannot work out what I am doing wrong.

I wonder anybody may be able to help direct me to a solution.

I am using a 18F4520 with 2.5 and masm401. I have checked that I have your latest version which I beleive to be 3.2 (dated 28/8/07).

when I compile the following code:

define OSC 16
INCLUDE "DT_INTS-18.bas"
INCLUDE "ReEnterPBP-18.bas" ; Include if using PBP interrupts
ASM
INT_LIST macro ; IntSource, Label, Type, ResetFlag?
INT_Handler CMP1_INT, _HopOut, PBP, yes
endm
INT_CREATE ; Creates the interrupt processor
ENDASM

TRISA = %00111111'
TRISD = %00000000
Z var bit
x var byte
CMCON = %00000010
@ INT_ENABLE CMP1_INT
Start:
PORTD.4 = 0
z = 0
Waiting:
if z = 0 then waiting

for x = 1 to 20
pause 50
toggle PORTD.4
next x
goto start

HopOut:
z = 1
@ INT_RETURN

end


I recieve the following complie errors



Error[128]........: Missing argument(s)
Error[113]........: Symbol not previously defined(IntFlagReg)
Error[113]........: Symbol not previously defined(IntFlagBit)
Error[113]........: Symbol not previously defined(IntFlagReg)
Error[113]........: Symbol not previously defined(IntFlagBit)
Error[101]........: ERRORInterrupt Source(IntFlagReg,IntFlagBit)not found)
Error[128]........: Missing argument(s)
Error[101]........: ERRORINT_ENABLE -Interupt Source not Found!)


If I change the CMP1 to CMP2 I receive errors

If I change the CMP1 to CMP then it compiles okay.

Any thoughts... should I be looking to set the registers manually maybe? I was planning to use both comparators independantly.

Thanks

[Acetronics2]

Hi,

No surprise if you read the interrupt sources list

#define INT_INT INTCON,INT0IF ;-- INT External Interrupt, 16F compatible
#define INT0_INT INTCON,INT0IF ;-- INT0 External Interrupt
#define INT1_INT INTCON3,INT1IF ;-- INT1 External Interrupt
#define INT2_INT INTCON3,INT2IF ;-- INT2 External Interrupt
#define INT3_INT INTCON3,INT3IF ;-- INT3 External Interrupt
#define RBC_INT INTCON,RBIF ;-- RB Port Change Interrupt
#define TMR0_INT INTCON,TMR0IF ;-- TMR0 Overflow Interrupt 18F
#define TMR1_INT PIR1,TMR1IF ;-- TMR1 Overflow Interrupt
#define TMR2_INT PIR1,TMR2IF ;-- TMR2 to PR2 Match Interrupt
#define TMR3_INT PIR2,TMR3IF ;-- TMR3 Overflow Interrupt
#define TMR4_INT PIR3,TMR4IF ;-- TMR4 Overflow Interrupt
#define TX_INT PIR1,TXIF ;-- USART Transmit Interrupt
#define TX1_INT PIR1,TX1IF ;-- USART1 Transmit Interrupt
#define TX2_INT PIR3,TX2IF ;-- USART2 Transmit Interrupt
#define RX_INT PIR1,RCIF ;-- USART Receive Interrupt
#define RX1_INT PIR1,RC1IF ;-- USART1 Receive Interrupt
#define RX2_INT PIR3,RC2IF ;-- USART2 Receive Interrupt
#define CMP_INT PIR2,CMIF ;-- Comparator Interrupt
#define EE_INT PIR2,EEIF ;-- EEPROM/FLASH Write Operation Interrupt
#define BUS_INT PIR2,BCLIF ;-- Bus Collision Interrupt
#define LVD_INT PIR2,LVDIF ;-- Low Voltage Detect Interrupt
#define HLVD_INT PIR2,HLVDIF ;-- High/Low Voltage Detect Interrupt
#define PSP_INT PIR1, PSPIF ;-- Parallel Slave Port Read/Write Interrupt
#define AD_INT PIR1, ADIF ;-- A/D Converter Interrupt
#define SSP_INT PIR1, SSPIF ;-- Master Synchronous Serial Port Interrupt
#define CCP1_INT PIR1, CCP1IF ;-- CCP1 Interrupt
#define CCP2_INT PIR2, CCP2IF ;-- CCP2 Interrupt
#define CCP3_INT PIR3, CCP3IF ;-- CCP3 Interrupt
#define CCP4_INT PIR3, CCP4IF ;-- CCP4 Interrupt
#define CCP5_INT PIR3, CCP5IF ;-- CCP5 Interrupt
#define USB_INT PIR2, USBIF ;-- USB Interrupt
#define OSC_INT PIR2, OSCFIF ;-- Oscillator Fail Interrupt



... only this :

#define CMP_INT PIR2,CMIF ;-- Comparator Interrupt

I think you have Yourself to look from which comparator the interrupt comes ...

Alain

[duncan303]

Hi Alain

Thankyou Alain for taking the trouble to read my post and make a suggestion, may I draw your attention to the defines further down Darrel's wonderful coding.

;_____ Comparators __________________________________________________ ________
#define CMP0_INT PIR1, CMP0IF ;-- Comparator 0 - 1230/1330 only

CMPIFREG = PIR2 ;-- Comparator 1
CMPIEREG = PIE2
CMPIPREG = IPR2
ifdef C1IF ; 18F24K20 18F25K20 18F26K20
CM1IFBIT = C1IF ; 18F44K20 18F45K20 18F46K20
endif
ifdef CM1IF
CM1IFBIT = CM1IF ; several J PICs
endif
ifdef CMP1IF
CMPIFREG = PIR1 ; 1230/1330 only
CM1IFBIT = CMP1IF
CMPIEREG = PIE1
CMPIPREG = IPR1
endif

ifdef CM1IFBIT
#define CMP1_INT CMPIFREG, CM1IFBIT
endif

ifdef C2IF ;-- Comparator 2
CM2IFBIT = C2IF ; 18F24K20 18F25K20 18F26K20
endif ; 18F44K20 18F45K20 18F46K20
ifdef CM2IF
CM2IFBIT = CM2IF ; several J PICs
endif
ifdef CMP2IF
CM2IFBIT = CMP2IF ; 1230/1330 only
endif

ifdef CM2IFBIT
#define CMP2_INT CMPIFREG, CM2IFBIT
endif
'-----------------------------------------------------------------------------

I think we are all waiting for the "K" series, perhaps this will compile to the K. I shall try it.

I did wonder wether I should set the ADCON for this device particularily the LATA register. But I am also aware that <6> of the PIR2 PIE2 and IPR2 only refers to one CMI, I presume I shall have to be careful to make sure that any interrupt on either comparator does not interfere with the other. ie if one comparator is set then the other is disabled.

Thanks again for your help.

Duncan

[Darrel Taylor]

The difference is that on the 4520, there is only 1 interrupt source for the Comparator module. A change in either comparator will cause an interrupt to the same handler.

There are other chips that have individual interrupt flags for each comparator, but not the 4520.

So you need to use the CMP_INT, on that chip.
<br>

[duncan303]

Hi Darrel,

Thanks for reply, I had slowly worked my way towrds that.

for th 18F45K20 Migration
The comparator is no longer controlled by the
CMCON register and each comparator now has it’s
own control register, CM1CON and CM2CON. The
functionality of the bits has also changed.

there is a section that confirms the observations made about the registers, so it really does always boil down to RTFD, but reading is sometimes not enough if you suffer from word blindness, anyway it gave me the opportunity to say thankyou for your routines which I intend to use.

Duncan.

Furthermore if everybody read and fully "understood" the datasheets this forum would die.