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docs about irq handlers
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Irmen de Jong
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06f0984fa1
@ -544,7 +544,9 @@ will issue a warning then telling you the result values of a subroutine call are
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subroutines are *non-reentrant*. This means you cannot create recursive calls.
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If you do need a recursive algorithm, you'll have to hand code it in embedded assembly for now,
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or rewrite it into an iterative algorithm.
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Also, subroutines used in the main program should not be used from an IRQ handler.
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Also, subroutines used in the main program should not be used from an IRQ handler. This is because
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the subroutine may be interrupted, and will then call itself from the IRQ handler. Results are
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then undefined because the variables will get overwritten.
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.. _builtinfunctions:
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@ -738,3 +740,16 @@ rrestore()
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read_flags()
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Returns the current value of the CPU status register.
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Library routines
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----------------
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There are many routines available in the compiler libraries.
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Some are used internally by the compiler as well.
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There's too many to list here, just have a look through the source code
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of the library modules to see what's there.
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(They can be found in the compiler/res directory)
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The example programs also use a small set of the library routines, you can study
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their source code to see how they might be used.
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@ -145,3 +145,35 @@ Arguments and result values are passed via global variables stored in memory
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*These are not allocated on a stack* so it is not possible to create recursive calls!
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The result value(s) of a subroutine are returned on the evaluation stack,
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to make it possible to use subroutines in expressions.
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IRQ Handling
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============
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Normally, the system's default IRQ handling is not interfered with.
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You can however install your own IRQ handler.
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This is possible ofcourse by doing it all using customized inline assembly,
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but there are a few library routines available to make setting up C-64 IRQs and raster IRQs a lot easier (no assembly code required).
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These routines are::
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c64utils.set_irqvec()
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c64utils.set_irqvec_excl()
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c64utils.set_rasterirq( <raster line> )
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c64utils.set_rasterirq_excl( <raster line> )
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c64utils.restore_irqvec() ; set it back to the systems default irq handler
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If you activate an IRQ handler with one of these, it expects the handler to be defined
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as a subroutine ``irq`` in the module ``irq`` so like this::
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~ irq {
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sub irq() {
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; ... irq handling here ...
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}
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}
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.. todo::
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@todo the irq handler should use its own eval-stack to avoid stack interference issues
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@ -1,3 +1,10 @@
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; TehTriz - a Tetris clone.
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;
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; @todo: hold block.
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; @todo: show next 2 blocks instead of just 1.
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~ main {
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const ubyte boardOffsetX = 14
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@ -52,7 +59,9 @@ waitkey:
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if_z goto waitkey
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if key>='1' and key<='7' {
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; select block type
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; select block type, reset to start pos
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xpos = startXpos
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ypos = startYpos
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drawBlock(xpos, ypos, 32)
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blocklogic.newCurrentBlock(key-'1')
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drawBlock(xpos, ypos, 160)
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@ -202,52 +211,55 @@ waitkey:
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ubyte[16] currentBlock
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ubyte[16] rotated
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; block colors I, J, L, O, S, T, Z: cyan, blue, orange, yellow, green, purple, red
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ubyte[7] blockColors = [3, 6, 8, 7, 5, 4, 2]
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ubyte[4] blockI = [4, 5, 6, 7] ; note: special rotation (only 2 states)
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ubyte[4] blockJ = [0, 4, 5, 6]
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ubyte[4] blockL = [2, 4, 5, 6]
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ubyte[4] blockO = [1, 2, 5, 6] ; note: no rotation (square)
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ubyte[4] blockS = [1, 2, 4, 5]
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ubyte[4] blockT = [1, 4, 5, 6]
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ubyte[4] blockZ = [0, 1, 5, 6]
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; the 7 tetrominos
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ubyte[16] blockI = [0,0,0,0, ; cyan ; note: special rotation (only 2 states)
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3,3,3,3,
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0,0,0,0,
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0,0,0,0]
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ubyte[16] blockJ = [6,0,0,0, ; blue
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6,6,6,0,
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0,0,0,0,
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0,0,0,0]
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ubyte[16] blockL = [0,0,8,0, ; orange
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8,8,8,0,
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0,0,0,0,
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0,0,0,0]
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ubyte[16] blockO = [0,7,7,0, ; yellow ; note: no rotation (square)
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0,7,7,0,
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0,0,0,0,
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0,0,0,0]
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ubyte[16] blockS = [0,5,5,0, ; green
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5,5,0,0,
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0,0,0,0,
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0,0,0,0]
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ubyte[16] blockT = [0,4,0,0, ; purple
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4,4,4,0,
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0,0,0,0,
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0,0,0,0]
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ubyte[16] blockZ = [2,2,0,0, ; red
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0,2,2,0,
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0,0,0,0,
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0,0,0,0]
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; @todo would be nice to have a pointer type, like so:
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; uword[7] blocks = [&blockI, &blockJ, &blockL, &blockO, &blockS, &blockT, &blockZ]
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sub newCurrentBlock(ubyte block) {
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memset(currentBlock, len(currentBlock), 0)
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currentBlockNum = block
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; @todo would be nice to have an explicit pointer type to reference the array, and code the loop only once...
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ubyte blockCol = blockColors[block]
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ubyte i
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if block==0 { ; I
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for i in blockI
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currentBlock[i] = blockCol
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}
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else if block==1 { ; J
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for i in blockJ
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currentBlock[i] = blockCol
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}
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else if block==2 { ; L
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for i in blockL
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currentBlock[i] = blockCol
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}
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else if block==3 { ; O
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for i in blockO
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currentBlock[i] = blockCol
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}
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else if block==4 { ; S
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for i in blockS
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currentBlock[i] = blockCol
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}
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else if block==5 { ; T
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for i in blockT
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currentBlock[i] = blockCol
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}
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else if block==6 { ; Z
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for i in blockZ
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currentBlock[i] = blockCol
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}
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if block==0
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memcopy(blockI, currentBlock, len(currentBlock))
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else if block==1
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memcopy(blockJ, currentBlock, len(currentBlock))
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else if block==2
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memcopy(blockL, currentBlock, len(currentBlock))
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else if block==3
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memcopy(blockO, currentBlock, len(currentBlock))
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else if block==4
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memcopy(blockS, currentBlock, len(currentBlock))
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else if block==5
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memcopy(blockT, currentBlock, len(currentBlock))
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else if block==6
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memcopy(blockZ, currentBlock, len(currentBlock))
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}
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sub rotateCW() {
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@ -5,8 +5,6 @@
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; @todo see problem in looplabelproblem.p8
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; @todo gradle fatJar should include the antlr runtime jar
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sub start() {
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uword w = 12345
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