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IO 请教为什么调试中无法向IO寄存器写值

问
我用2812 的片子,编写了下面的一个小程序测试IO口:
void main()
{
volatile unsigned int* GPAMUX = (volatile unsigned int*)0x70C0;
volatile unsigned int* GPADIR = (volatile unsigned int*)0x70C1;
volatile unsigned int* GPAQUAL= (volatile unsigned int*)0x70C3;
volatile unsigned int* GPADAT = (volatile unsigned int*)0x70E0;
volatile unsigned int* GPASET = (volatile unsigned int*)0x70E1;
volatile unsigned int* GPACLEAR= (volatile unsigned int*)0x70E2;
volatile unsigned int* GPATOGGLE= (volatile unsigned int*)0x70E3;
int a;
*GPAMUX =0x0000;
*GPADIR =0xFFFF;
*GPADAT =0x0505;
}
在调试时通过view-〉memory来观察以上几个寄存器的值,很可惜看不到有任何变化,万分不解,请高手指点 答 1: 看看GEL,是不是使能相关地址的读写 答 2: 谢谢问题解决了是ALLOW位的问题,只要对allow位置位 ,我不清楚受allow位影响的寄存器有哪些,我在手册上 没找到 ,能不能告知一二
void main()
{
volatile unsigned int* GPAMUX = (volatile unsigned int*)0x70C0;
volatile unsigned int* GPADIR = (volatile unsigned int*)0x70C1;
volatile unsigned int* GPAQUAL= (volatile unsigned int*)0x70C3;
volatile unsigned int* GPADAT = (volatile unsigned int*)0x70E0;
volatile unsigned int* GPASET = (volatile unsigned int*)0x70E1;
volatile unsigned int* GPACLEAR= (volatile unsigned int*)0x70E2;
volatile unsigned int* GPATOGGLE= (volatile unsigned int*)0x70E3;
int a;
*GPAMUX =0x0000;
*GPADIR =0xFFFF;
*GPADAT =0x0505;
}
在调试时通过view-〉memory来观察以上几个寄存器的值,很可惜看不到有任何变化,万分不解,请高手指点 答 1: 看看GEL,是不是使能相关地址的读写 答 2: 谢谢问题解决了是ALLOW位的问题,只要对allow位置位 ,我不清楚受allow位影响的寄存器有哪些,我在手册上 没找到 ,能不能告知一二
共2条
1/1 1 跳转至页
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