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hotpower 发表于 2008-6-15 04:44 德州仪器(TI) ←返回版面 ![]() ![]() ![]() |
楼主：?裸奔裸出精彩---菜农成功在DSP5402上将汇编正法,发帖自贺 |
长期以来,不知是何人发明,在许多C/C++环境下启动代码都需要汇编语言编写.
这主要是代码地址定位困难的问题.
而启动代码最关键部分就是中断向量表或中断代码表,前者只有中断服务程序的
入口地址,后者要包含跳转指令后加中断服务程序的入口地址两部分.
后者的代表就是MCS51,它间隔8字节地址,一般有跳转命令和简洁代码组成.
前者的代表如ARM7等.
在DSP54XX中,中断的架构类同MCS51.它间隔4字地址,共32个中断空间.
其中复位(中断)入口地址(假定为0x0080)处一般汇编代码为:
????????.align??0x0080????????????; must be aligned on page boundary
RESET:??????????????????????????; reset vector
????????BD _c_int00?????????????????????????????; branch to C entry point
????????STM #200,SP?????????????????????????????; stack size of 200
nmi:????RETE????????????????????; enable interrupts and return from one
????????????????NOP
????????????????NOP
????????????????NOP?????????????????????????????????????;NMI~
????????????????; software interrupts
sint17 .space 4*16
..................
我们可以设想:
既然很有规律,间隔又相同,我们为何不用数组或结构去代替汇编代码呢???
虽然DSP/BIOS就不需要汇编启动代码,都由系统自动配置,但实际上也是向其地址
空间添入中断入口地址.
所以答案是肯定可以的,那么如何去实现呢???自己想想~~~
菜农已将其嵌入到新版的c5402cfg.h中,操作极为方便.
例如:
const uVectorEntry g_pfnVectors[] = {
????ISR_Reset(),???//reset??????0x0080 #0
????ISR_Default(), //nmi????????0x0084 #1
????ISR_Default(), //sint17?????0x0088 #2????
????ISR_Default(), //sint18?????0x008c #3
????ISR_Default(), //sint19?????0x0090 #4
????ISR_Default(), //sint20?????0x0094 #5
????ISR_Default(), //sint21?????0x0098 #6
????ISR_Default(), //sint22?????0x009c #7
????ISR_Default(), //sint23?????0x00a0 #8
????ISR_Default(), //sint24?????0x00a4 #9
????ISR_Default(), //sint25?????0x00a8 #10
????ISR_Default(), //sint26?????0x00ac #11
????ISR_Default(), //sint27?????0x00b0 #12
????ISR_Default(), //sint28?????0x00b4 #13
????ISR_Default(), //sint29?????0x00b8 #14
????ISR_Default(), //sint30?????0x00bc #15
????ISR(Eint0Isr), //int0???????0x00c0 #16
????ISR(Eint1Isr), //int1???????0x00c4 #17
????ISR(Eint2Isr), //int2???????0x00c8 #18
????ISR(Timer0Isr),//tint???????0x00cc #19
????ISR(McBSPIsr), //rint0??????0x00d0 #20
????ISR_Default(), //xint0??????0x00d4 #21
????ISR_Default(), //rint1??????0x00d8 #22
????ISR_Default(), //xint1??????0x00dc #23
????ISR(Eint3Isr), //int3???????0x00e0 #24
????ISR_Default(), //hpint??????0x00e4 #25
????ISR_Default(), //???????????0x00e8 #26
????ISR_Default(), //???????????0x00ec #27
????ISR_Default(), //???????????0x00f0 #28
????ISR_Default(), //???????????0x00f4 #29
????ISR_Default(), //???????????0x00f8 #30
????ISR_Default(), //???????????0x00fc #31
};
哈哈~~~让intvecs.asm见鬼去吧~~~
6.14确实是个好日子~~~俺分别倒塌了:
1.构造了cstring,使ccs能和其他的C++一样对字符串的操作,而且可以随意增添.
2.实现了外部RAM/ROM真正的数组访问,而且比指针少一条指令.
3.成功正法ASM~~~
4.第6感告诉俺HotOS肯定会实现~~而且在代码空间上估计能打败DSP/BIOS,
??但愿苍天有眼不辜负菜农的"一腔热血"~~~
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FPGA/DSP
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2008-06-15
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