求助关于2812编程

新手上路

Rank: 1

UID: 114293

1^#

打印

字体大小: tT

reporter发表于 2014-3-14 17:26 | 只看该作者

求助关于2812编程

寄存器, 存储器

刚开始学2812，以前学过点54xx，想动手写2812的汇编。

下面是一段54xx代码：

&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;.mmregs&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; ;54X 存储器影射寄存器定义&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp;.global&nbsp;&nbsp;_main&nbsp; &nbsp;;声明_main为全局符号

_main:
&nbsp; &nbsp; nop
;-----------------------------------------------------&nbsp; &nbsp;
;----------------------初始化 CPU---------------------
;-----------------------------------------------------&nbsp; &nbsp;
&nbsp; &nbsp; ssbx&nbsp;&nbsp;INTM&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;; INTM=1，禁止所有可屏蔽中断
&nbsp; &nbsp; ld&nbsp; &nbsp; #0, DP&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; ; 设置数据页指针DP=0
&nbsp; &nbsp; &nbsp; &nbsp; stm&nbsp; &nbsp;#0, CLKMD&nbsp; &nbsp;&nbsp; &nbsp; ; 切换CPU内部PLL到分频模式
;-------------------------------------------------------------------&nbsp; &nbsp; &nbsp; &nbsp;
;CLKMD DEFINITIONS:&nbsp; &nbsp; &nbsp; &nbsp;
;&nbsp; &nbsp; PLLMUL (bit 15-12) - 0000&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; PLL multiplier = 0 (mult by 1)
;&nbsp; &nbsp; PLLDIV (bit 11)&nbsp; &nbsp; -&nbsp; &nbsp;&nbsp;&nbsp;0&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp

LL divider = 0 (div by 1)
;&nbsp; &nbsp; PLLCOUNT (bit 10-3)-&nbsp; &nbsp;&nbsp; &nbsp;11111111&nbsp; &nbsp; PLL counter set to max
;&nbsp; &nbsp; PLLONOFF (bit 2)&nbsp; &nbsp;-&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;1&nbsp; &nbsp

LL on
;&nbsp; &nbsp; PLLNDIV (bit 1)&nbsp; &nbsp; -&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;1&nbsp;&nbsp;Select PLL mode
;&nbsp; &nbsp; PLLSTATUS (bit 1)&nbsp;&nbsp;-&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; x PLL Status (read only)
;&nbsp; &nbsp; ------------------
;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;0000011111111111 = 0x07ff CLKMD=1 X CLKIN
;--------------------------------------------------------------------&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;
Statu1:
&nbsp; &nbsp; ldm&nbsp; &nbsp;CLKMD, A
&nbsp; &nbsp; and&nbsp; &nbsp;#01b, A&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;
&nbsp; &nbsp; bc&nbsp; &nbsp; Statu1, ANEQ&nbsp; &nbsp; &nbsp; &nbsp;&nbsp; &nbsp;;检查是否已经切换到分频模式？
&nbsp; &nbsp; &nbsp; &nbsp; stm&nbsp; &nbsp;#0x07ff,CLKMD&nbsp; &nbsp;;设置DSP 时钟 10MHZ
;--------------------------------------------------------------------&nbsp; &nbsp; &nbsp; &nbsp;
&nbsp; &nbsp; &nbsp; &nbsp; nop
&nbsp; &nbsp; &nbsp; &nbsp; stm&nbsp; &nbsp;#0x3FF2,PMST&nbsp;&nbsp;
;--------------------------------------------------------------------&nbsp;&nbsp;
MST DEFINITIONS
;&nbsp; &nbsp; IPTR (bit 15-7) -&nbsp;&nbsp;001111111&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; Run-time Interrupt vector location = 0x3f80 (for now)
;&nbsp; &nbsp; MP/~MC (bit 6)&nbsp;&nbsp;-&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;1&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;Turn off internal Instruction ROM (use RAM)
;&nbsp; &nbsp; OVLY&nbsp; &nbsp;(bit 5)&nbsp;&nbsp;-&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;1&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;Turn on internal RAM
;&nbsp; &nbsp; AVIS&nbsp; &nbsp;(bit 4)&nbsp;&nbsp;-&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; 1&nbsp; &nbsp;&nbsp; &nbsp; Address visibility on
;&nbsp; &nbsp; DROM&nbsp; &nbsp;(bit 3)&nbsp;&nbsp;-&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;0&nbsp; &nbsp;&nbsp; &nbsp;Data ROM of FF00~FFFF is external
;&nbsp; &nbsp; CLKOFF (bit 2)&nbsp;&nbsp;-&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;0&nbsp; &nbsp;&nbsp;&nbsp;Clockout&nbsp;&nbsp;enabled,only for use clkout=cpu clock
;&nbsp; &nbsp; SMUL&nbsp; &nbsp;(bit 1)&nbsp;&nbsp;-&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; 1&nbsp; &nbsp; Saturate before multiply on MAC
;&nbsp; &nbsp; SST&nbsp; &nbsp; (bit 0)&nbsp;&nbsp;-&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;0&nbsp; &nbsp;Do not saturate before store
;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; -----------------
;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; 0011 1111 1111 0010 = 0x3ff2
;*---------------------------------------------------------------------*/&nbsp; &nbsp; &nbsp; &nbsp;

想请教下老手，如果用纯汇编在2812上写类似的东西，有几点不明白：
1、 .mmregs是否还要
2、2812里面是不是没有了，对位的操作了。
3、对2812频率的设置是不是，不需要再跳向分频模式，再切换频率，也不要再判断了。
4、另外能不能解答下dsp是怎么跳向_main的，这个问题在学54xx的时候也没完全搞清楚。知道54xx从ff80开始执行，然后中断向量表可以搬移，是不是在编译的时候选的参数就是确定_main是主程序的入口地址。还是CCS自动找.TEXT段的第一句的代码。

收藏分享评分

回复引用

订阅 TOP

返回列表

求助 关于2812编程

求助 关于2812编程

求助关于2812编程

求助关于2812编程