mcbspinit.asm

DSP实验程序:数据采集实验,练习使用DSP进行数据采集

***串口0的初始化设置程序
 .include MMRegs.h
 .global _mcbspinit    
 .title "mcbsp.asm"
 .sect  "mcbsp"
 

_mcbspinit:
***************以下是设定mcbsp0的串口工作方式
   stm SPCR1, McBSP0_SPSA		;将mcbsp0的spcr1寄存器的子地址存入mcbsp0的subbank子地址寄存器
   stm #0000h, McBSP0_SPSD		;spcr1寄存器值设定为0000h，reset接收，接收中断由RRDY信号触发，数据右对齐
   stm SPCR2, McBSP0_SPSA		;将mcbsp0的spcr2寄存器的子地址存入mcbsp0的subbank子地址寄存器
   stm #0200h, McBSP0_SPSD		;spcr2寄存器值设定为0200h，reset发送、grst、frst，发送中断由XRDY信号触发
   stm RCR1, McBSP0_SPSA		;将mcbsp0的rcr1寄存器的子地址存入mcbsp0的subbank子地址寄存器
   stm #0040h, McBSP0_SPSD		;rcr1寄存器值设定为0040h，接收数据时每帧1word，每word=16bits
   stm RCR2, McBSP0_SPSA		;将mcbsp0的rcr2寄存器的子地址存入mcbsp0的subbank子地址寄存器
   stm #0044h, McBSP0_SPSD		;rcr2寄存器值设定为0044h，接收数据时signal-phase frame方式，第一帧以后的多余脉冲被忽略，数据不延迟
   stm XCR1, McBSP0_SPSA		;将mcbsp0的xcr1寄存器的子地址存入mcbsp0的subbank子地址寄存器
   stm #0040h, McBSP0_SPSD		;xcr1寄存器值设定为0040h，发送数据时每帧1word，每word=16bits
   stm XCR2, McBSP0_SPSA		;将mcbsp0的xcr2寄存器的子地址存入mcbsp0的subbank子地址寄存器
   stm #0044h, McBSP0_SPSD		;xcr2寄存器值设定为0044h，发送数据时signal frame方式，第一帧以后的脉冲被忽略，数据不延迟
   
   stm PCR, McBSP0_SPSA		;将mcbsp的pcr寄存器的子地址存入mcbsp0的subbank子地址寄存器
   stm #0002h, McBSP0_SPSD		;fsx/fsr、clkx/clkr采用外部时钟，fsx/fsr都是高电平有效，clkx上升沿有效，clkr下降沿有效
   nop
   nop				;等待两个周期
   stm SPCR1, McBSP0_SPSA		;
   stm #0001, McBSP0_SPSD		;设置rrst=1
   stm SPCR2, McBSP0_SPSA		;
   stm #0201, McBSP0_SPSD		;设置xrst=1
   rpt #5
   nop
   
   ret
   .end