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git-svn-id: http://svn.code.sf.net/p/netboot65/code@89 93682198-c243-4bdb-bd91-e943c89aac3b

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jonnosan 2009-04-06 11:09:26 +00:00
parent 391abf4f6d
commit 1d4cdace80
1 changed files with 2 additions and 4 deletions
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doc/netboot65_api.txt
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@ -13,11 +13,9 @@ To use the API, an app should do the following:
1) turn on the cartridge ROM (LDA #$01 / STA $de00) - the netboot65 code turns the cartridge ROM just before exiting to BASIC or starting whatever program it has loaded via tftp.
2) make sure that NB65_VBL_VECTOR routine 60 times a second. This is automatically inserted into the IRQ handler chain by the NB65_INIT_IP function, but if
you install your own IRQ handler and don't chain via the previous contents of $314, then you should do a JSR to NB65_VBL_VECTOR every vertical blank.(This routine ends with a RTS not RTI). All this routine does is count clock ticks, so it uses very little raster time. If you miss the occasional VBL, it won't
matter too much.
2) make sure that NB65_VBL_VECTOR routine is called 60 times a second. This is automatically inserted into the IRQ handler chain by the NB65_INIT_IP function, but if you install your own IRQ handler and don't chain (i.e call the previous contents of $314, then you should do a JSR to NB65_VBL_VECTOR every vertical blank. (This routine ends with a RTS not RTI). All this routine does is count clock ticks, so it uses very little raster time. If you miss the occasional VBL, it won't matter too much.
3) use whatever network functions are desired, by setting up an appropriate buffer of parameters, then setting the function number of the desired function into Y, setting AX to point to the buffer of paramaters, and then calling (via JSR) NB65_DISPATCH_VECTOR. Every function uses the carry flag to indicate errors (set on error, clear otherwise). Some functions return values, either in A, AX, or by updating the buffer that was originally passed in.
3) use whatever network functions are desired, by setting up an appropriate buffer of parameters, then setting the function number of the desired function into Y, setting AX to point to the buffer of paramaters, and then calling (via JSR) NB65_DISPATCH_VECTOR. Every function uses the carry flag to indicate errors (set on error, clear otherwise). Some functions return values, either in A, AX, or by updating the buffer that was originally passed in.
4) it is necessary to call the NB65_PERIODIC_PROCESSING_VECTOR several times a second to check for any inbound packets. If a packet has arrived, it will be processed, and potentially a callback handler may create and send an outbound message in response. This means processing time can vary, and ocassionaly be quite long. Therefore this routine should not be called inside time critical code e..g. an interrupt service routine.