C54X外部中断的问题

我在处理DSP #INT0 #INT1中断时,同样的程序,有时候就没问题,有时候就跑飞,比如从起计算机,是什么状态的不确定导致这种情况发生呢

估计是内存引用的问题，你最好在调试时打开softice

check the following:

-- reset your dsp by debug/reset

-- check your PMST, to make sure that your you have set up your dsp correctly, pay special attention to MC/MP, ovly etc.. Also verify your reset vector, esp. the reset vector. You can set up a gel file to do the init for you

-- how did you set up your isr? The TI interrupt pragma does not work. You might have to write your own code to save the registers. If you use paged external memory, you have to save BK, BRAF/BRC too. I once run into paging problem at block rpt, and it took me half a week to find out what went wrong.


good luck

我用C写的中断程序，在编译后看汇编程序发现已经用压栈的方式保护了一些寄存器，还需要手动保护那些寄存器，为什么访问外部存储空间就要保护BK/BRAF/BRC ？我的中断确实读取了外部的MEM。

已给分~~谢谢lyingying 大大

have you declared the function to be isr by pragma? TI c requires any c-function to save AR0-AR2, AR6 and AR7 (?) and some other registers, check the c-language guide. To save the enviroment, I would have an asm function as isr, save and restore the environment, and calls your c-isr.

The block rpt problems applies only to PAGED external mem. If an function set up a block repeat and is interrupted by isr, and if the isr is on a different page and runs over the end of the block repeat, the BR registers will force it to the begining of the block rpt, if you do not save and clear the block rpt registers. From then on, you loose your head.

Much more need to be done on paged external mem. You have to check the .cinit etc. to make sure that your global and static are on the right page...

Memory corruption can lead things you described too. I always use local or global, try to avoid memalloc.