prog8/examples/cx16/multi-irq-new.p8

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%import palette
%import textio
%import syslib
%zeropage basicsafe
; Example that shows a way to handle multiple IRQ sources on the X16.
; This uses the "NEW" way using the X16 specific interrupt handler routines in cx16.
; Currently only Vera interrupts are supported. VIA irqs are an exercise for the reader.
main {
sub start() {
cx16.enable_irq_handlers(true)
cx16.set_line_irq_handler(150, &irq.line_irq)
cx16.set_vsync_irq_handler(&irq.vsync_irq)
txt.print("\n\n\nx16 irq handlers installed (new style)\n")
txt.print("red = vsync irq\n")
txt.print("green = first line irq\n")
txt.print("blue = second line irq\n")
}
}
irq {
sub vsync_irq() -> bool {
cx16.save_vera_context()
palette.set_color(0, $f00)
repeat 1000 {
cx16.r0++
}
palette.set_color(0, $000)
cx16.restore_vera_context()
return true
}
sub line_irq() -> bool {
cx16.save_vera_context()
if cx16.VERA_SCANLINE_L==150 {
palette.set_color(0, $0f0)
sys.set_rasterline(200) ; prepare next line irq
} else {
palette.set_color(0, $00f)
sys.set_rasterline(150) ; back to first line irq
}
repeat 500 {
cx16.r0++
}
palette.set_color(0, $000)
cx16.restore_vera_context()
return false
}
}