一起来学习：TMS320F2812中FLASH寄存器的配置问题解答

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reporter发表于 2013-10-10 11:25 | 只看该作者

一起来学习：TMS320F2812中FLASH寄存器的配置问题解答

问：我使用的是TI ２０００系列芯片中的２８１２！

　　我使用的是汇编语言对其进行开发，目前主程序已经完成，需要烧写到ＦＬＡＳＨ中运行，但烧写过后发现在ＦＬＡＳＨ中运行的速度和在ＲＡＭ中用仿真器仿真的速度差不多！这样就太慢了，我设置的ＰＬＬ倍频到１５０ＭＨＺ，后来发现是有关ＦＬＡＳＨ的一些配置寄存器没有进行配置，我想在ＦＬＡＳＨ中运行速度过慢的原因可能是这个造成的吧！

　　我查看了ＴＩ的说明文档，其中关于ＦＬＡＳＨ寄存器的介绍中，有如下的一段：

　　Note: Flash configuration registers should not be accessed while an access is in progress in flash or OTPmemory
The flash registers should not beaccessed from code that is running from&nbsp;&nbsp;OTP or flash memory or while an accessmay be in progress. All register accesses to the flash registers should be madefrom code executing outside of flash/OTP memory and an access shouldnot be attempted until all activity on the flash/OTP has completed. Nohardware is included to protect for this.
You can read the flash registers fromcode executing in flash/OTP; however,do not write to the registers.

　　从上面的一段看出，如果需要配置ＦＬＡＳＨ的寄存器，必须执行ＦＬＡＳＨ以外存储空间的程序才可以实现，我又发现这些寄存器是受ＥＡＬＬＯＷ和ＣＳＭ保护的，所以我按照以下步骤试图重新配置寄存器：

　　１，在执行存放于ＦＬＡＳＨ中的主程序段时，将一段存于ＦＬＡＳＨ中的初始化ｆｌａｓｈ配置寄存器的程序完全复制到片内Ｌ０ＳＡＲＡＭ中，该初始化程序如下：MOVW&nbsp;&nbsp;DP,#DP_FLASH&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;;指向FLASH寄存器所在的页面

&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;EALLOW

&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;MOV&nbsp; &nbsp;AL,#01H

&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;MOV&nbsp; &nbsp;@FOPT,AL&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;;使能FLASH流水线模式

&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;MOV&nbsp; &nbsp;AL,#03H

&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;MOV&nbsp; &nbsp;@FPWR,AL

&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;MOV&nbsp; &nbsp;AL,#0FFH

&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;MOV&nbsp; &nbsp;@FSTDBYWAIT,AL

&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;MOV&nbsp; &nbsp;AL,#0FFH

&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;MOV&nbsp; &nbsp;@FACTIVEWAIT,AL

&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;MOV&nbsp; &nbsp;AL,#0203H

&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;MOV&nbsp; &nbsp;@FBANKWAIT,AL

&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;MOV&nbsp; &nbsp;AL,#06H

&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;MOV&nbsp; &nbsp;@FOTPWAIT,AL

&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;EDIS

&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;LB&nbsp; &nbsp;&nbsp;&nbsp;FLASH_RET&nbsp; &nbsp; ；FLASH_RET 是我这段程序需要返回到的地址
复制代码2，我配置了CSM模块的寄存器，使得器件不受CSM的保护

&nbsp; &nbsp;&nbsp;&nbsp;3，用&nbsp; &nbsp;MOVL&nbsp;&nbsp;XAR7，#8300H&nbsp; &nbsp;&nbsp; &nbsp; ；200H是初始化程序复制到RAM中的地址&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;

&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;LB&nbsp; &nbsp; *XAR7

&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;从FLASH跳转到RAM中执行该段初始化FLASH的程序

&nbsp; &nbsp;&nbsp;&nbsp;4，从RAM中返回到FLASH中的主程序继续执行&nbsp;&nbsp;但发现这段程序烧写到片子里面后，不能按照我的意图执行，FLASH寄存器没有得到重新
配置，&nbsp; &nbsp;请问这是什么原因呢？

&nbsp; &nbsp;&nbsp; &nbsp;&nbsp;&nbsp;我上述的几个步骤对不对呢？

&nbsp; &nbsp;&nbsp; &nbsp;请问，如果在程序烧写到片内FLASH中，在执行该程想调到RAM中执行另一段程

&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; 这种情况应该如何实现呢？

&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp;&nbsp; &nbsp; 应该有哪些需要注意的地方呢？

&nbsp; &nbsp;&nbsp;&nbsp;如果那位有配置FLASH寄存器的例子的话，请发给我一份做一下参考吧！

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答：在flash中怎么能运行配置属于flash的寄存器呢？自己改变自己是不行的。
要配置flash的寄存器，需要把对应的代码拷贝到RAM中运行，这样才能起作用。具体参考spra958c&nbsp; &nbsp; Running an Application fromInternal Flash Memory on the TMS320F281x DSP (Rev. C).pdf

其实在flash中也可以运行配置flash的寄存器,只不过中间要加NOP,和循环延迟。

的, 中, 寄存器, FLASH

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