ENABLE
Contents |
Action
Enable specified interrupt.
(ATTINY, ATMEGA, ATXMEGA)
Syntax
ENABLE interrupt [, prio]
[, prio] is only for ATXMEGA
Remarks
|
Interrupt |
Description |
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INT0 |
External Interrupt 0 |
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INT1 |
External Interrupt 1 |
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OVF0,TIMER0, COUNTER0 |
TIMER0 overflow interrupt |
|
OVF1,TIMER1,
COUNTER1 |
TIMER1 overflow interrupt |
|
CAPTURE1, ICP1 |
INPUT CAPTURE TIMER1 interrupt |
|
COMPARE1A,OC1A or
COMPARE1, OC1 |
TIMER1 OUTPUT COMPARE A interrupt
In case of only one compare interrupt |
|
COMPARE1B,OC1B |
TIMER1 OUTPUT COMPARE B interrupt |
|
SPI |
SPI interrupt |
|
URXC |
Serial RX complete interrupt |
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UDRE |
Serial data register empty interrupt |
|
UTXC |
Serial TX complete interrupt |
|
SERIAL |
Disables URXC, UDRE and UTXC |
|
ACI |
Analog comparator interrupt |
|
ADC |
A/D converter interrupt |
| |
|
|
XMEGA ONLY |
|
|
prio |
The priority you want to assign to the interrupt. Specify Lo, Hi or Med. In the Xmega you must provide the priority of the interrupts. Lo=Low priority. Hi=High priority and Med=Medium priority. If you do not specify a priority, MED will be used. |
By default all interrupts are disabled.
The global interrupts master switch is also disabled by default.
If you enable an interrupt, it will only fire if the master interrupt switch is enabled.
You enable this master switch with ENABLE INTERRUPTS.
You can disable it with DISABLE INTERRUPTS.
If an interrupt is executed, the global master switch will be disabled automatically by the hardware.
This is to prevent other interrupts to occur.
When the interrupt routine returns, the processor hardware will automatically enable the master switch so new interrupts may occur.
It depends on the processor how many and which interrupts it has. If you type ENABLE in the editor, you will get a pop up with a list of interrupts you can chose from.
ATTINY & ATMEGA Interrupt List
In normal AVR chips the priority is determined by the interrupts address. The lower the address, the higher the priority.
In the DAT file you can find a list with interrupts and their address.
For example , taken from the m1280def.dat file "
[INTLIST]
count=56
INTname1=INT0,$002,EIMSK.INT0,EIFR.INTF0
INTname2=INT1,$004,EIMSK.INT1,EIFR.INTF1
INTname3=INT2,$006,EIMSK.INT2,EIFR.INTF2
INTname4=INT3,$008,EIMSK.INT3,EIFR.INTF3
INTname5=INT4,$00a,EIMSK.INT4,EIFR.INTF4
INTname6=INT5,$00c,EIMSK.INT5,EIFR.INTF5
INT0 has the highest priority since it has the lowest address (address 2)
Following an Overview where INT0 is used as an example.
Overview
1. You configure an Interrupt
On Int0 Int0_isr
Config Int0 = Low Level
2. You enable the specific Interrupt
Enable Int0
3. Enable all Interrupts
Enable Interrupts
4. You have an Interrupt Service Routine after the "End" with an Return
End
' Interrupt Service Routine
Int0_isr:
' so someting.....
Return
XMEGA
The XMEGA has a priority system. You can specify if an interrupt has a low, medium or high priority.
But you MUST enable these priorities with CONFIG PRIORITY
Please read the topic CONFIG PRIORITY in order to understand which interrupt to enable.
In the DAT file you can find a list with interrupts and their address.
For example , taken from the "xm128A4Udef.dat file "
INTLIST]
count=95
INTname1=OSCFAIL,$0002,OSC_XOSCFAIL.0,OSC_XOSCFAIL.1 ; XOSC Failure Detection Register
INTname2=PORTC_INT0,$0004,#PORTC_INTCTRL.0,PORTC_INTFLAGS.0
INTname3=PORTC_INT1,$0006,#PORTC_INTCTRL.2,PORTC_INTFLAGS.1
INTname4=PORTR_INT0,$0008,#PORTR_INTCTRL.0,PORTR_INTFLAGS.0
INTname5=PORTR_INT1,$000A,#PORTR_INTCTRL.2,PORTR_INTFLAGS.1
INTname6=DMA_CH0,$000C,#,DMA_CH0_CTRLB.0,DMA_CH0_CTRLB.4
INTname7=DMA_CH1,$000E,#,DMA_CH1_CTRLB.0,DMA_CH1_CTRLB.4
INTname8=DMA_CH2,$0010,#,DMA_CH2_CTRLB.0,DMA_CH2_CTRLB.4
INTname9=DMA_CH3,$0012,#,DMA_CH3_CTRLB.0,DMA_CH3_CTRLB.4
INTname10=RTC_OVF,$0014,#RTC_INTCTRL.0,RTC_INTFLAGS.0
INTname11=RTC_COMP,$0016,#RTC_INTCTRL.2,RTC_INTFLAGS.1
Example with PORTC_INT0
On Portc_int0 portc_isr
Enable Portc_int0 , Hi
In ATXMEGA there is an example for Pin Interrupt.
See also
DISABLE , ON , CONFIG PRIORITY, ATXMEGA
Example
$regfile = "attiny25.dat" $crystal = 1000000 ' 1MHz $hwstack = 10 $swstack = 0 $framesize = 24 On Int0 Int0_isr ' INT0 will be the wake-up source for Powerdown Mode Config Int0 = Low Level ' External Pull-up (47K) on Portb.2 Enable Int0 '############################################################################### Do Wait 3 ' now we have 3 second to measure the Supply Current in Active Mode Enable Interrupts ' Now call Powerdown function Config Powermode = Powerdown 'Here you have time to measure PowerDown current consumption until a Low Level on Portb.1 which is the PowerDown wake-up Loop '############################################################################### End Int0_isr: ' wake_up Return
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