开始 接收ADC通道采样数据 把接收到的数据在反馈到DAC通道 结束中断服务程序等待下一次中断
中断服务程序
参考程序： .title \
BSP .set 0 ;当前使用McBsp1
;McBsp 内存映射寄存器 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
;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 .endif .if BSP = 1 SPSA .set SPSA1 SPSD .set SPSD1 RDRR .set DRR11 RDXR .set DXR11 .endif
WR_SUB_REG .macro val,addr stm addr,SPSA nop stm val,SPSD nop .endm
RD_SUB_REG .macro addr,acc stm #:addr:,SPSA nop ldm SPSD,acc nop nop nop .endm
WAITTRX .macro WAITR?
;写McBsp控制寄存器 ;读McBsp控制寄存器;等待串口中断
RD_SUB_REG SPCR1,A and #1<<1, A
bc WAITR?, AEQ .endm
PROGREG .macro progword stm #01h,RDXR WAITTRX
stm #:progword:,RDXR ;与AD50二次通讯
WAITTRX
.endm
wait .macro STM #0008h, AR0 RPT *AR0 NOP .endm .mmregs .global _c_int00 .sect \
RESET bd _c_int00 stm #2000h,SP .space 19*4*16 BRINT0 b recv nop nop
BXINT0 b trans nop nop .space 10*4*16 ;BRINT1 b recv ; nop ; nop
;BXINT1 b trans ; nop ; nop ; .space 4*4*16
.text _c_int00 ld #0h,DP stm #2000h,SP ssbx INTM ssbx SXM
st #2491h,SWWSR st #0ffe0h,PMST st #0f007h,CLKMD
stm #4000h,AR1 stm #4000h,ar2 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 ;启动McBsp串口 WR_SUB_REG #0201H,SPCR2
ld 100,A wait aic_init stm #0h,IMR orm #030h,IMR stm #0ffffh,IFR
PROGREG 0000001100000001b ; 876543210
PROGREG 0000010000010000b ; 876543210 ;PROGREG 0104H ;二次通讯初始化AD50 ;PROGREG 0280H ;PROGREG 0301h ;PROGREG 045Ah ;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 ;ADC采样数据发送到DAC输出 and #0fffeh,a ;and #8000h,a stlm A,RDXR rete
trans rsbx XF rete