19

LTC1402

RCVbufAddr

.set

0x800

;(address of receive buffer)

RCVbufSize

.set

0x800

;(length of receive buffer)works up to 800

*

*

*

**********************************************************************

.eval ((Loopback >> 1)|((Format & 2)<<1)|(BurstMode <<3)|(IntCLK <<4)|(IntSync <<5)) ,SPCval

.eval ((CLKDIV)|(FS_polarity <<5)|(CLK_polarity<<6)|((Format & 1)<<7)|(Frame_ignore<<8)|(PCM_Mode<<9)), SPCEval

.eval (SPCEval|(XMTautobuf<<10)|(XMThalt<<12)|(RCVautobuf<<13)|(RCVhalt<<15)), SPCEval

sineinit:

bspc = #SPCval

; places buffered serial port in reset

ifr = #10h

; clear interrupt flags

imr = #210h

; Enable HPINT,enable BRINT0

intm = 0

; all unmasked interrupts are enabled.

bspce = #SPCEval

; programs BSPCE and ABU

axr = #XMTbufAddr

; initializes transmit buffer start address

bkx = #XMTbufSize

; initializes transmit buffer size

arr = #RCVbufAddr

; initializes receive buffer start address

bkr = #RCVbufSize

; initializes receive buffer size

bspc = #(SPCval | GO)

; bring buffered serial port out of reset

return

;for transmit and receive because GO=0xC0

.space 16*32

;clear a chunk at the end to mark the end

;======================================================================

;

; VECTORS

;

;======================================================================

.sect “vectors”

;The vectors start here

;get BSP vectors

; ***************************************************************************

;

Vector Table for the ‘C54x DSKplus

;

BSP vectors and Debugger vectors

;

TDM vectors just return

; ***************************************************************************

; The vectors in this table can be configured for processing external and

; internal software interrupts. The DSKplus debugger uses four interrupt

; vectors. These are RESET, TRAP2, INT2, and HPIINT.

; * DO NOT MODIFY THESE FOUR VECTORS IF YOU PLAN TO USE THE DEBUGGER *

;

; All other vector locations are free to use. When programming always be sure

; the HPIINT bit is unmasked (IMR=200h) to allow the communications kernel and

; host PC interact. INT2 should normally be masked (IMR(bit 2) = 0) so that the

; DSP will not interrupt itself during a HINT. HINT is tied to INT2 externally.

;

;

;

.mmregs

reset

goto #80h

;00; RESET * DO NOT MODIFY IF USING DEBUGGER *

nop

nop

nmi

return_enable

;04; non-maskable external interrupt

nop

nop

nop

trap2 goto #88h

;08; trap2 * DO NOT MODIFY IF USING DEBUGGER *

nop

nop

.space 52*16

;0C-3F: vectors for software interrupts 18-30

int0

return_enable

;40; external interrupt int0

nop

nop

nop

int1

return_enable

;44; external interrupt int1

nop

nop

nop

int2

return_enable

;48; external interrupt int2

nop

nop

nop