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分享一个在linux app层调用/dev/mem来控制WORK_LED的方法
发表于 2015-5-12 21:11:30
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如下代码完全由本人编写，亲自验证通过的，大家欢迎交流~通过这种方法不光可以控制指示灯哦~
APP代码：
- #include<stdio.h>
- #include<string.h>
- #include<unistd.h>
- #include<sys/mman.h>
- #include<sys/types.h>
- #include<sys/stat.h>
- #include<fcntl.h>
- /* 数据类型*/
- #define INVALID_UCHAR 0xff
- #define FALSE 0
- #define TRUE 1
- #define uchar unsigned char
- #define ushort unsigned short
- #define uint unsigned int
- #define ulong unsigned long
- /* 命令行相关宏定义*/
- #define CMD_BUF_LEN 32
- #define CMD_LOGO "<WSF>"
- #define OUTPUT_BUF_LEN 64
- #define CMD_PRIMY_NUM 3
- #define CMD_EXTEND_NUM 2
- #define CMD_WORD_MAX 10
- #define CMD_LEN 20
- char g_acCMD_PrimyWord[CMD_PRIMY_NUM][CMD_LEN] = {"test", "wr", "rd"};
- char g_acCMD_ExtendWord[CMD_EXTEND_NUM][CMD_LEN] = {"openmem", "closemem"};
- char g_acCMD_Word[CMD_WORD_MAX][CMD_LEN];
- /* 内存设备相关*/
- typedef struct MEM_DeviceInfo
- {
- int fd;
- int *map_VirAddr;
- int *map_PhyAddr;
- int memlen;
- int flag;
- }MEM_INFO_S;
- MEM_INFO_S g_stMemInfo = {0};
- uchar MEM_InitDevice(int phyaddr, int len)
- {
- int fd;//文件句柄
- uchar *map_base = NULL;
- /* 未打开MEM设备则打开*/
- if (0 == g_stMemInfo.fd)
- {
- /* 打开mem设备*/
- fd = open("/dev/mem", O_RDWR|O_SYNC);
- if (fd == -1)
- {
- printf("ERROR: Open mem device failed!\r\n");
- return FALSE;
- }
- g_stMemInfo.fd = fd;
- }
- /* 映射虚拟地址*/
- map_base = mmap(NULL, len, PROT_READ|PROT_WRITE, MAP_SHARED, g_stMemInfo.fd, phyaddr);
- if (MAP_FAILED == map_base)
- {
- perror("mmap");
- printf("ERROR: mmap mem device failed!\r\n");
- return FALSE;
- }
- // printf("mmap virtual address 0x%x\r\n", map_base);
- g_stMemInfo.map_VirAddr = (int *)map_base;
- // g_stMemInfo.map_PhyAddr = (int *)phyaddr;
- g_stMemInfo.memlen = len;
- g_stMemInfo.flag = TRUE;
- return TRUE;
- }
- void MEM_ReleaseDevice(void)
- {
- if (TRUE == g_stMemInfo.flag)
- {
- /* 释放虚拟地址*/
- munmap( g_stMemInfo.map_VirAddr, g_stMemInfo.memlen);
- g_stMemInfo.flag = FALSE;
- }
- /* 关闭文件*/
- close(g_stMemInfo.fd);
- memset(&g_stMemInfo, 0, sizeof(g_stMemInfo));
- }
- uchar CMD_GetWord(char *cCmd)
- {
- char *cString, *cTmp;
- char cDelims[] = " ";
- uchar ucWordCnt = 0;
- int mapAddr = 0;
- // cString = ltrim(cCmd);
- cString = cCmd;
- // printf("\r\nget:");
- // printf(cString);
- memset(g_acCMD_Word, 0, sizeof(g_acCMD_Word)) ;
- while (ucWordCnt < CMD_WORD_MAX)
- {
- if (0 == ucWordCnt)
- {
- cTmp = strtok(cString, cDelims);
- }
- else
- {
- cTmp = strtok(NULL, cDelims);
- }
- if (NULL == cTmp)
- {
- break;
- }
- strcpy(g_acCMD_Word[ucWordCnt], cTmp);
- // printf("\r\naa:");
- // printf(g_acCMD_Word[ucWordCnt]);
- ucWordCnt++;
- }
- return ucWordCnt;
- }
- uchar CMD_MatchWord(char *cCmdSrc, char cCmdDes[][CMD_LEN])
- {
- char *cString;
- uchar ucIndex = INVALID_UCHAR;
- // cString = ltrim(cCmdSrc);
- // cString = rtrim(cCmdSrc);
- cString = cCmdSrc;
- for (ucIndex = 0; ucIndex < CMD_PRIMY_NUM; ucIndex++)
- {
- if (0 == strcmp (cString, cCmdDes[ucIndex]))
- {
- break;
- }
- // printf("\r\nbb:");
- // printf(cCmdDes[ucIndex]);
- }
- if (CMD_PRIMY_NUM == ucIndex)
- {
- ucIndex = INVALID_UCHAR;
- }
- return ucIndex;
- }
- int main (void)
- {
- int i;
- char cCmd[CMD_BUF_LEN] = {0};
- char cOutBuf[OUTPUT_BUF_LEN] = {0};
- uchar ucCmdWordCnt = 0;
- uchar ucCmdPrimyIndex = 0, ucCmdExtendIndex = 0;
- uint uiAddr, uiData, uiLen;
- uint *pTmp = NULL;
- printf ("hello my test\r\n");
- printf(CMD_LOGO);//打印命令logo
- while(1)
- {
- gets (cCmd);//获取输入命令
- ucCmdWordCnt = CMD_GetWord(cCmd);
- if (ucCmdWordCnt > 0)
- {
- ucCmdPrimyIndex = CMD_MatchWord (g_acCMD_Word[0], g_acCMD_PrimyWord) ;
- switch(ucCmdPrimyIndex)
- {
- case 0:
- {
- if (ucCmdWordCnt == 4)
- {
- ucCmdExtendIndex = CMD_MatchWord (g_acCMD_Word[1], g_acCMD_ExtendWord) ;
- if (0 == ucCmdExtendIndex)
- {
- sscanf(g_acCMD_Word[2], "%x", &uiAddr);
- sscanf(g_acCMD_Word[3], "%x", &uiLen);
- if (FALSE == MEM_InitDevice (uiAddr, uiLen))
- {
- break;
- }
- printf("Command : test initmem addr:0x%x,len:0x%x\r\n", uiAddr, uiLen);
- }
- }
- else if (ucCmdWordCnt == 2)
- {
- ucCmdExtendIndex = CMD_MatchWord (g_acCMD_Word[1], g_acCMD_ExtendWord) ;
- if (1 == ucCmdExtendIndex)
- {
- MEM_ReleaseDevice ();
- printf("Command : test close mem\r\n");
- }
- }
- else
- {
- printf("ERROR: Cmd invaild!\r\n");
- }
- break;
- }
- case 1:
- {
- if (ucCmdWordCnt == 3)
- {
- sscanf(g_acCMD_Word[1], "%x", &uiAddr);
- sscanf(g_acCMD_Word[2], "%x", &uiData);
- if (TRUE == g_stMemInfo.flag)
- {
- if (uiAddr <= g_stMemInfo.memlen)
- {
- uiAddr = (long)g_stMemInfo.map_VirAddr + uiAddr;
- pTmp = (uint *)uiAddr;
- *pTmp = uiData;
- }
- printf("Command : write addr:0x%x,data:0x%x\r\n", uiAddr, *pTmp);
- break;
- }
- printf("ERROR: Device not be opened!\r\n");
- }
- else
- {
- printf("ERROR: Cmd invaild!\r\n");
- }
- break;
- }
- case 2:
- {
- if (ucCmdWordCnt == 2)
- {
- sscanf(g_acCMD_Word[1], "%x", &uiAddr);
- if (TRUE == g_stMemInfo.flag)
- {
- if (uiAddr <= g_stMemInfo.memlen)
- {
- uiAddr = (long)g_stMemInfo.map_VirAddr + uiAddr;
- printf("read address 0x%x\r\n", uiAddr);
- pTmp = (uint *)uiAddr;
- uiData = *pTmp;
- }
- printf("Command : read addr:0x%x,data:0x%x\r\n", uiAddr, uiData);
- break;
- }
- printf("ERROR: Device not be opened!\r\n");
- }
- else
- {
- printf("ERROR: Cmd invaild!\r\n");
- }
- break;
- }
- default:
- {
- printf("ERROR: Cmd invaild!\r\n");
- break;
- }
- }
- }
- printf(CMD_LOGO);//打印命令logo
- // sprintf(cOutBuf, "%s\r\n", cCmd);//打印输入字符串
- // printf(cCmd);
- /* 清缓存*/
- memset (cCmd, 0, CMD_BUF_LEN);
- // memset (cOutBuf, 0, OUTPUT_BUF_LEN);
- }
- return 0;
- }
- all = test
- objects = testmem.o
- CC = arm-linux-gnueabihf-gcc
- $(all):$(objects)
- $(CC) -static -o $(all) $(objects)
- $(objects):%.o:%.c
- $(CC) -c [ DISCUZ_CODE_13 ]lt; -o $@
- clean:
- rm -f *.o $(all) *~
实际界面操作：
- <blockquote>shell@rk3288:/data/local/test #
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