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

BX:SI
ES:DI
1 = DRQ1
Output Parameter: Pointer to unsigned long where this function will write the (20-Bit physical) source
address
Output Parameter: Pointer to unsigned long where this function will write the (20-Bit physical)
destination address
Return Value
Comments
AX = 0 DMA channel disabled
AX = 1 DMA channel (user mode) enabled for transfer
AX = -1 Invalid DMA channel
AX = -2 DMA channel used for serial interface
CX = DMA counter (bytes which have yet to be transferred)
DX = Control Register: Bit 0: 1=Priority for the channel / 0=Priority for the other channel
Bit 1: 1=Source synchronized / 0=No source synchronization
Bit 2: 1=Destination synchronized / 0=No destination synchronization
Bit 3: 1=Use interrupt at end of transfer / 0=do not use an interrupt
Bit 4: must be set to '1'
Bit 5: 1=Source address increment / 0=No increment of source address
Bit 6: 1=Source address decrement / 0=No decrement of source Address
Bit 7: 1=Source is in memory space / 0=Source is in IO space
Bit 8: 1=Destination address increment / 0=No increment of destination address
Bit 9: 1=Destination address decrement / 0=No decrement of destination address
Bit 10: 1=Destination is in memory space / 0=Destination is in IO space
Bit 11: 1=Word Transfer / 0=Byte Transfer
[BX:SI] = contains unsigned long (20-Bit physical) DMA source address
[ES:DI] = contains unsigned long (20-Bit physical) DMA destination address
This function returns the status of the DMA channel in AX.
Related Topics
Top of list
Index page
Start DMA Transfer
Interrupt 0xA1 service 0xC0: HAL: Initialize/Restore Non-Volatile Data
Initialize/Restore non-volatile data. Tell the @CHIP-RTOS where your variables are located, which
should be saved and reload their saved values, if available.
The non-volatile (remanent) data is stored in A:\rema.bin file.
Parameters
AH
Must be 0xC0
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