IPC@CHIP Documentation - SC12 @CHIP-RTOS V1.10

AH
AL
Must be 0x88.
DRQ channel:
0 = DRQ0
1 = DRQ1
Return Value
Comments
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AX = 0 no error
AX = -1 invalid DRQ channel
AX = -2 DMA channel is used for serial interface
You must disable the serial port DMA mode to use external DMA. This is done with a CHIP.INI entry.
The COM port uses DRQ1 and the EXT port uses DRQ0.
used pins:
DRQ[0..1]
excluded pins:
if DRQ0: PIO1, INT5, default I²C-Bus pins
if DRQ1: PIO0, INT6, default I²C-Bus pins
Interrupt 0xA2 service 0x89: PFE: Enable INT0 / INTA cascade mode
Parameters
AH
Enable INT0 / INTA cascade mode
Must be 0x89.
Return Value
none
Comments
To install a service interrupt routine in cascade mode, the
HAL function 0x84 "Install Interrupt Service Routine" can not be used, because
the cascaded interrupt controller supply the interrupt type over the bus.
Install a normal interrupt service routine (ISR) using the setvect function.
At the end of your ISR, issue an EOI to both the cascaded controller and to
the internal interrupt controller (INT0).
used pins:
INT0, INTA#
excluded pins:
PIO13, TMROUT0, INT0 in normal mode, PIO6, PCS2#, PWD, hw flow control serial port 1
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