| ; Author: Frederik Noring <noring@nocrew.org> |
| ; |
| ; This file is subject to the terms and conditions of the GNU General Public |
| ; License. See the file COPYING in the main directory of this archive |
| ; for more details. |
| |
| ; DSP56k loader |
| |
| ; Host Interface |
| M_BCR EQU $FFFE ; Port A Bus Control Register |
| M_PBC EQU $FFE0 ; Port B Control Register |
| M_PBDDR EQU $FFE2 ; Port B Data Direction Register |
| M_PBD EQU $FFE4 ; Port B Data Register |
| M_PCC EQU $FFE1 ; Port C Control Register |
| M_PCDDR EQU $FFE3 ; Port C Data Direction Register |
| M_PCD EQU $FFE5 ; Port C Data Register |
| |
| M_HCR EQU $FFE8 ; Host Control Register |
| M_HSR EQU $FFE9 ; Host Status Register |
| M_HRX EQU $FFEB ; Host Receive Data Register |
| M_HTX EQU $FFEB ; Host Transmit Data Register |
| |
| ; SSI, Synchronous Serial Interface |
| M_RX EQU $FFEF ; Serial Receive Data Register |
| M_TX EQU $FFEF ; Serial Transmit Data Register |
| M_CRA EQU $FFEC ; SSI Control Register A |
| M_CRB EQU $FFED ; SSI Control Register B |
| M_SR EQU $FFEE ; SSI Status Register |
| M_TSR EQU $FFEE ; SSI Time Slot Register |
| |
| ; Exception Processing |
| M_IPR EQU $FFFF ; Interrupt Priority Register |
| |
| org P:$0 |
| start jmp <$40 |
| |
| org P:$40 |
| ; ; Zero 16384 DSP X and Y words |
| ; clr A #0,r0 |
| ; clr B #0,r4 |
| ; do #64,<_block1 |
| ; rep #256 |
| ; move A,X:(r0)+ B,Y:(r4)+ |
| ;_block1 ; Zero (32768-512) Program words |
| ; clr A #512,r0 |
| ; do #126,<_block2 |
| ; rep #256 |
| ; move A,P:(r0)+ |
| ;_block2 |
| |
| ; Copy DSP program control |
| move #real,r0 |
| move #upload,r1 |
| do #upload_end-upload,_copy |
| movem P:(r0)+,x0 |
| movem x0,P:(r1)+ |
| _copy movep #4,X:<<M_HCR |
| movep #$c00,X:<<M_IPR |
| and #<$fe,mr |
| jmp upload |
| |
| real |
| org P:$7ea9 |
| upload |
| movep #1,X:<<M_PBC |
| movep #0,X:<<M_BCR |
| |
| next jclr #0,X:<<M_HSR,* |
| movep X:<<M_HRX,A |
| move #>3,x0 |
| cmp x0,A #>1,x0 |
| jeq <$0 |
| _get_address |
| jclr #0,X:<<M_HSR,_get_address |
| movep X:<<M_HRX,r0 |
| _get_length |
| jclr #0,X:<<M_HSR,_get_length |
| movep X:<<M_HRX,y0 |
| cmp x0,A #>2,x0 |
| jeq load_X |
| cmp x0,A |
| jeq load_Y |
| |
| load_P do y0,_load_P |
| jclr #0,X:<<M_HSR,* |
| movep X:<<M_HRX,P:(r0)+ |
| _load_P jmp next |
| load_X do y0,_load_X |
| jclr #0,X:<<M_HSR,* |
| movep X:<<M_HRX,X:(r0)+ |
| _load_X jmp next |
| load_Y do y0,_load_Y |
| jclr #0,X:<<M_HSR,* |
| movep X:<<M_HRX,Y:(r0)+ |
| _load_Y jmp next |
| |
| upload_end |
| end |
