DSP正弦波發生器源代碼:

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* FileName:??ex11.asm?????????????????????? *
* Description:?正弦波發生器實驗?????????????? *
* Copyright(C) SanZhi Electronic, Author Zpin? *
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??.title "ex11"

BSP???.set??1??;當前使用McBsp1

;McBsp 內存映射寄存器
SPSA0??.set??? 038h
SPSD0??.set??? 039h
DRR10??.set??? 021h
DRR20??.set?020h
DXR10??.set??? 023h
DXR20??.set?022h

SPSA1??.set??? 048h
SPSD1?????? .set??? 049h
DRR11?????? .set?041h
DRR21?????? .set??? 040h
DXR11?????? .set??? 043h
DXR21?????? .set?042h

SPSA2?????? .set??? 034h
SPSD2?????? .set??? 035h
DRR12?????? .set??? 031h
DRR22?????? .set?030h
DXR12?????? .set??? 033h
DXR22?????? .set?032h

;McBsp Subaddressed Registers
SPCR1??.set?00h
SPCR2??.set?01h
RCR1??.set?02h
RCR2??.set?03h
XCR1??.set?04h
XCR2??.set?05h
SRGR1??.set?06h
SRGR2??.set?07h
MCR1??.set?08h
MCR2??.set?09h
RCERA??.set?0ah
RCERB??.set?0bh
XCERA??.set?0ch
XCERB??.set?0dh
PCR???.set?0eh

??.if BSP = 0
SPSA?.set?SPSA0
SPSD?.set?SPSD0
RDRR?.set?DRR10
RDXR?.set?DXR10
IMASK?.set?0010h
??.endif
??
??.if BSP = 1
SPSA?.set?SPSA1
SPSD?.set?SPSD1
RDRR?.set?DRR11
RDXR?.set?DXR11
IMASK?.set?0400h
??.endif
??

WR_SUB_REG?.macro val,addr???;寫McBsp控制寄存器
???stm addr,SPSA
???nop
???stm val,SPSD
???nop
???.endm
???
RD_SUB_REG?.macro addr,acc???;讀McBsp控制寄存器
???stm #:addr:,SPSA
???nop
???ldm SPSD,acc
???nop
???nop
???nop
???.endm

WAITTRX?? .macro?????;等待串口中斷
WAITR?
??????? RD_SUB_REG SPCR1,A
??????? and #1<<1, A
??????? bc?? WAITR?, AEQ
????????? .endm

PROGREG?? .macro progword???;與AD50二次通訊
????
???stm? #01h,RDXR
??????? WAITTRX
??????? stm???? #:progword:,RDXR
??????? WAITTRX
????????? .endm??????????????

wait?? .macro
? ??STM #0008h, AR0
??RPT *AR0
??NOP
??.endm ???

??.mmregs
??.global _c_int00

??.sect ".vectors"
RESET?bd _c_int00
??stm #3000h,SP
??.space 19*4*16
BRINT0?b recv
??nop
??nop
BXINT0?b trans
??nop
??nop
??.space 4*4*16
BRINT1?b recv
??nop
??nop
BXINT1?b trans
??nop
??nop
??.space 4*4*16
??
??.data
??.word 8000h,0db23h,8000h,0e1e7h,8000h,0fb47h,8000h,15e5h,8000h,252fh,

8000h,2879h,8000h,1b1fh,8000h,0155h
??.text
_c_int00
??ld #0h,DP
??stm #37ffh,SP
??ssbx INTM
??ssbx SXM
??????? st #2491h,SWWSR
??????? st #0ffe0h,PMST
??????? st #0f007h,CLKMD
???????
??????? stm #4100h,AR2
??????? stm #4000h,AR1
??stm #10h,BK
???????
mcbsp_init???????;初始化McBsp串口
??????? rsbx CPL
???? nop???????????????? ; cpl latency
??? ?nop???????????????? ; cpl latency
???? ?nop???????????????? ; cpl latency

???? ?ld?? #0, DP?????????????
???? ?ssbx INTM?????
???? ?ssbx SXM?

??WR_SUB_REG #0000H,SPCR1
??WR_SUB_REG #0200H,SPCR2
??WR_SUB_REG #000CH,PCR
??WR_SUB_REG #0000H,SPCR1
??WR_SUB_REG #0000H,SPCR2
??WR_SUB_REG #0040H,RCR1??;16 BITs
??WR_SUB_REG #0004H,RCR2??;Ignore FS after the first
??WR_SUB_REG #0040H,XCR1??;16 BITs
??WR_SUB_REG #0004H,XCR2??;Ignore FS after the first
??
??ld 100,A
??wait
??
??andm #0ff3fh, 54h???;set interrupts to come from serial ports not DMA
?????????;by clearing bits 6 and 7 in DMPREC
??stm #0,RDXR
??
??WR_SUB_REG #0001H,SPCR1??;啟動McBsp串口
??WR_SUB_REG #0201H,SPCR2
??
??ld 100,A
??wait
??
aic_init
??stm #0h,IMR
??orm #IMASK,IMR
??stm #0ffffh,IFR

??;PROGREG 0104H????;二次通訊初始化AD50
??;PROGREG 02C0H
??PROGREG 0301h
??PROGREG 0400h
??;PROGREG 0000001100000001b
???????????? ;???????? 876543210
??????? ;PROGREG 0000010000010000b
???????????? ;???????? 876543210

??ld RDRR,A
??ld RDRR,A
??
??stlm A,RDXR
??stlm A,RDXR
??
??rsbx INTM
??nop
??nop
??nop
??
js??nop
??nop
??nop
??b js

recv?ldm RDRR,A????;讀ADC采樣值以清除中斷標志
??ld *AR1+%,A????;讀正弦波表
??and #0fffeh,A
??stlm A,RDXR????;輸出到DAC通道
??rete

trans?rsbx XF
??rete
??.end

?