IMX6Q EIM寄存器配置问你

z358915781

LINUX下，eim_reg = (int  *)mmap(NULL, 4*6*4+4*3, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0x021B8000);   ，这个方式居然不能写EIM的配置寄存器【其他外设比如GPIO_BASE=0x0209C000就能正常配置和操作IO】，而且访问EIM 数据地址空间CPU就会死掉，是什么原因？无论怎么配置EIM寄存器的值，回读EIM寄存器值都是如下值

RegInit 2##EIM_CS0GCR1=0x00610089
RegInit 2##EIM_CS0GCR2=0x00001002
RegInit 2##EIM_CS0RCR1=0x1C022000
RegInit 2##EIM_CS0RCR2=0x00000000
RegInit 2##EIM_CS0WCR1=0x1C092480
RegInit 2##EIM_CS0WCR2=0x00000000


代码：
   eim_reg[ZJWEIM_CS0RCR1] = 0x0C000000;
   eim_reg[ZJWEIM_CS0RCR2] = 0x00000000;
   eim_reg[ZJWEIM_CS0WCR1] = 0x0A000000;
   eim_reg[ZJWEIM_CS0GCR1] = 0x0041008F;
   eim_reg[ZJWEIM_CS0GCR2] = 0x00000001;
     usleep(1000000);
     printf("RegInit 2##EIM_CS0GCR1=0x%08X\n",eim_reg[ZJWEIM_CS0GCR1]); //0x1C022000
         printf("RegInit 2##EIM_CS0GCR2=0x%08X\n",eim_reg[ZJWEIM_CS0GCR2]); //0x00000000
         printf("RegInit 2##EIM_CS0RCR1=0x%08X\n",eim_reg[ZJWEIM_CS0RCR1]); //0x1C092480
         printf("RegInit 2##EIM_CS0RCR2=0x%08X\n",eim_reg[ZJWEIM_CS0RCR2]); //0x00000000
         printf("RegInit 2##EIM_CS0WCR1=0x%08X\n",eim_reg[ZJWEIM_CS0WCR1]); //0x1C092480
     printf("RegInit 2##EIM_CS0WCR2=0x%08X\n",eim_reg[ZJWEIM_CS0WCR2]); //0x00000000

最佳答案

关于 EIM configuration你可以查看 linux/Documentation/devicetree/bindings/bus/imx-weim.txt linux-imx.git - i.MX Linux Kernel EIM registers in i.MX6Q RM Chapter 22 External Interface Module (EIM) h ...

• 小智MM
• 发表于2020-02-11
• 详细答案>>

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小智MM

关于 EIM configuration你可以查看

linux/Documentation/devicetree/bindings/bus/imx-weim.txt

linux-imx.git - i.MX Linux Kernel

EIM registers in i.MX6Q RM Chapter 22 External Interface Module (EIM)

http://cache.freescale.com/files ... manual/IMX6DQRM.pdf