Re: [Amforth-devel] Interrupts handling

[pito <pi...@vo...>]

Erich,
thanks for the answer! My first lessons learned are:

An user interrupt routine word e.g.:

: tick_isr ...

is registered by following procedure:

['] tick_isr TIMER2_OVFAddr int! ( register interupt )

This is probably the same as seen in another example:

940C 0006 i! ' kbd_clk i@ 0007 i!  \ Set INT2 vector

There is a list of interrupt addresses (vectors) in each particular device
file, e.g.for atmega32:
\ Interrupts
002  constant INT0Addr \ External Interrupt Request 0
004  constant INT1Addr \ External Interrupt Request 1
006  constant INT2Addr \ External Interrupt Request 2
008  constant TIMER2_COMPAddr \ Timer/Counter2 Compare Match
00A  constant TIMER2_OVFAddr \ Timer/Counter2 Overflow
00C  constant TIMER1_CAPTAddr \ Timer/Counter1 Capture Event
00E  constant TIMER1_COMPAAddr \ Timer/Counter1 Compare Match A
010  constant TIMER1_COMPBAddr \ Timer/Counter1 Compare Match B
012  constant TIMER1_OVFAddr \ Timer/Counter1 Overflow
014  constant TIMER0_COMPAddr \ Timer/Counter0 Compare Match
016  constant TIMER0_OVFAddr \ Timer/Counter0 Overflow
018  constant SPI_STCAddr \ Serial Transfer Complete
01A  constant USART_RXCAddr \ USART, Rx Complete
01C  constant USART_UDREAddr \ USART Data Register Empty
01E  constant USART_TXCAddr \ USART, Tx Complete
020  constant ADCAddr \ ADC Conversion Complete
022  constant EE_RDYAddr \ EEPROM Ready
024  constant ANA_COMPAddr \ Analog Comparator
026  constant TWIAddr \ 2-wire Serial Interface
28  constant SPM_RDYAddr \ Store Program Memory Ready.

So I may register my ISR word by above procedure to any interrupt addresses
(vectors) above.

After registering the user's word with interrupt handler vector the interrupt
occured will call the defined word.
Q: can I assign my words to any and all above vectors?
Q: shall I somehow clear interrupt flags or it is done automatically?

Pito

----- PŮVODNÍ ZPRÁVA -----
Od: "Erich Waelde" <ew....@na...>
Komu: amf...@li...
Předmět: Re: [Amforth-devel] Interrupts handling
Datum: 5.7.2010 - 21:29:12

> Hello,
> 
> Interrupt Handling in amforth:
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> http://amforth.sourceforge.net/howto.html says: