ad73311con.asm

DSP实验开发程序:信号发生器.学习使用CCS

***此段程序功能是初始化AD73311的各个寄存器，设定AD73311的工作方式，
***使AD73311进入数据模式，并且打开串口接收中断BRINT0，完成从AD73311得到采样数据
***采样程序在BRINT0的中断服务程序mcbsp0risr.asm
***中完成
****参数设置可设置采样率0x810b，0x811b，0x812b，0x813b，0x814b可设置采样率为
****64K,32K,21K,16K,12.8k
 .include MMRegs.h

 .global _admemory
 .global _adinit
 .title "ad73311con.asm"
 .sect "adinit" 
 
_adinit


 STM #00100111b, GPIOCR
 	nop
	nop
	nop
 STM #00100110b, GPIOSR 
 	nop
	nop
	nop
 stlm  a, McBSP0_DXR1
 ;stm #811bh, McBSP0_DXR1		;设置ad73311控制寄存器B，现在DMCLK=MCLK/4，SCLK=DMCLK/2
 								;设置813b中的后八位中的bit6－4控制DMCLK,设置bit3－2控制SCLK
 								;设置为810b，DMCLK=MCLK;811B，DMCLK=MCLK/2; 812B，DMCLK=MCLK/3;814B，DMCLK=MCLK/5
 	nop
	nop
	nop
 STM #00100111b, GPIOSR
	nop
	nop
	nop
flagc:
 stm SPCR2, McBSP0_SPSA
 ldm  McBSP0_SPSD, a
 and #0002h, a
 bc flagc,aeq			;如果spcr2寄存器中的XRDY位为1（可以写入数据），那么继续执行
 
 stm #8279h, McBSP0_DXR1		;设置ad73311控制寄存器C，5V模式disable，refout enable，所有机器power up
flagd:
 stm SPCR2, McBSP0_SPSA
 ldm  McBSP0_SPSD, a
 and #0002h, a
 bc flagd,aeq
 stm #8320h, McBSP0_DXR1		;设置ad73311控制寄存器D，设置输入PGA为26db,输出PGA为-15db
flage:
 stm SPCR2, 38h
 ldm  McBSP0_SPSD, a
 and #0002h, a
 bc flage,aeq

 stm #8400h, McBSP0_DXR1		;设置ad73311控制寄存器E，无群延时等等
flaga:
 stm SPCR2, McBSP0_SPSA
 ldm  McBSP0_SPSD, a
 and #0002h, a
 bc flaga, aeq
 stm #8001h, McBSP0_DXR1		;设置ad73311控制寄存器A，devices＝0，进入数据模式
flagdata:
 stm SPCR2, McBSP0_SPSA
 ldm  McBSP0_SPSD, a
 and #0002h, a
 bc flagdata, aeq
 
 
 ret
 .end