mmm ./
myandroid_google_20131220\development\ndk\\serial\andrloid.mk:
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := serialtest
LOCAL_SRC_FILES := serial.c
include $(BUILD_EXECUTABLE)
#include $(BUILD_SHARED_LIBRARY)
#LOCAL_PATH := $(call my-dir)
#include $(CLEAR_VARS)
#LOCAL_MODULE := serial
#LOCAL_SRC_FILES := serial.c
#ifeq ($(TARGET_ARCH_ABI),armeabi-v7a)
# LOCAL_CFLAGS := -DHAVE_NEON=1
# LOCAL_SRC_FILES += helloneon-intrinsics.c.neon
#endif
#LOCAL_STATIC_LIBRARIES := cpufeatures
#BUILD_EXECUTABLE := serial
#LOCAL_LDLIBS := -llog
#include $(BUILD_SHARED_LIBRARY)
#$(call import-module,cpufeatures)
myandroid_google_20131220\development\ndk\\serial\serial.c
/* 串口操作需要的头文件 */
#include <stdio.h> /*标准输入输出定义*/
#include <stdlib.h> /*标准函数库定义*/
#include <unistd.h> /*Unix标准函数库定义*/
#include <sys/types.h> /**/
#include <sys/stat.h> /**/
#include <fcntl.h> /*文件控制定义*/
#include <termios.h> /*PPSIX终端控制定义*/
#include <errno.h> /*错误号定义*/
#define FALSE -1
#define TRUE 0
/**
*@brief 设置串口通信速率
*@param fd 类型 int 打开串口的文件句柄
*@param speed 类型 int 串口速度
*@return void
*/
int speed_arr[] = { B115200,B38400, B19200, B9600, B4800, B2400, B1200, B300,
B38400, B19200, B9600, B4800, B2400, B1200, B300, };
int name_arr[] = {115200,38400, 19200, 9600, 4800, 2400, 1200, 300,
38400, 19200, 9600, 4800, 2400, 1200, 300, };
void set_speed(int fd, int speed)
{
int i;
int status;
struct termios Opt;
tcgetattr(fd, &Opt);
Opt.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
for ( i= 0; i < sizeof(speed_arr) / sizeof(int); i++)
{
if (speed == name_arr[i])
{
tcflush(fd, TCIOFLUSH);
cfsetispeed(&Opt, speed_arr[i]);
cfsetospeed(&Opt, speed_arr[i]);
status = tcsetattr(fd, TCSANOW, &Opt);
if (status != 0)
perror("tcsetattr fd1");
return;
}
tcflush(fd,TCIOFLUSH);
}
}
/**
*@brief 设置串口数据位,停止位和效验位
*@param fd 类型 int 打开的串口文件句柄*
*@param databits 类型 int 数据位 数据位为 7 或者8*
*@param stopbits 类型 int 停止位 取值为 1 或者2*
*@param parity 类型 int 效验类型 取值为 N,E,O,,S
*/
int set_Parity(int fd,int databits,int stopbits,int parity)
{
struct termios options;
if ( tcgetattr( fd,&options) != 0)
{
perror("SetupSerial 1");
return(FALSE);
}
options.c_cflag &= ~CSIZE;
options.c_cflag |= CRTSCTS; //CNEW_RTSCTS; //设置cts rts 流控
switch (databits) /*设置数据位数*/
{
case 7:
options.c_cflag |= CS7;
break;
case 8:
options.c_cflag |= CS8;
break;
default:
fprintf(stderr,"Unsupported data size\n");
return (FALSE);
}
switch (parity)
{
case 'n':
case 'N':
options.c_cflag &= ~PARENB; /* Clear parity enable */
options.c_iflag &= ~INPCK; /* Enable parity checking */
break;
case 'o':
case 'O':
options.c_cflag |= (PARODD | PARENB); /* 设置为奇效验*/
options.c_iflag |= INPCK; /* Disnable parity checking */
break;
case 'e':
case 'E':
options.c_cflag |= PARENB; /* Enable parity */
options.c_cflag &= ~PARODD; /* 转换为偶效验*/
options.c_iflag |= INPCK; /* Disnable parity checking */
break;
case 'S':
case 's': /*as no parity*/
options.c_cflag &= ~PARENB;
options.c_cflag &= ~CSTOPB;
break;
default:
fprintf(stderr,"Unsupported parity\n");
return (FALSE);
}
/* 设置停止位 */
switch (stopbits)
{
case 1:
options.c_cflag &= ~CSTOPB;
break;
case 2:
options.c_cflag |= CSTOPB;
break;
default:
fprintf(stderr,"Unsupported stop bits\n");
return (FALSE);
}
/* Set input parity option */
if (parity != 'n')
options.c_iflag |= INPCK;
//options.c_cc[VTIME] = 150; // 15 seconds
//options.c_cc[VMIN] = 0;
tcflush(fd,TCIFLUSH); /* Update the options and do it NOW */
if (tcsetattr(fd,TCSANOW,&options) != 0)
{
perror("SetupSerial 3");
return (FALSE);
}
return (TRUE);
}
/**
*@breif \u6253\u5f00\u4e32\u53e3
*/
int OpenDev(char *Dev)
{
int fd = open( Dev, O_RDWR|O_NONBLOCK); //以读写方式打开串口(或O_NOCTTY、 O_NDELAY //O_NONBLOCK
if (-1 == fd)
{
perror("Can't Open Serial Port");/*等于-1则表示不能打开串口一,报错信息*/
return -1;
}
else
return fd;/*能打开则返回句柄值*/
}
/**
*@breif main()
*/
int main(int argc, char **argv) //
{
int fd; //定义返回句柄变量
int nread; //定义读字节个数
int nwrite; //定义写字节个数
char buff_r[512]; //读到的字节储存数组
char buff_w[512]; //写字节的存储数组
int i = 0;
int w=0;
char *dev;
if(argc ==2)
{
dev = argv[1];
}
else
{
dev ="/dev/ttyUSB1"; //设备路径指针变量,指向设备文件
}
printf("1\n");
fd = OpenDev(dev); //打开此指针变量所指向的设备,并返回句柄值
if (fd>0) //如果句柄为正,表示正确打开
set_speed(fd,9600); //设置波特率
else
{
printf("Can't Open Serial Port!\n"); //句柄为负表示打开串口失败,打印错误信息
exit(0); //
}
printf("2\n");
if (set_Parity(fd,8,1,'E')== FALSE) //设置效验函数,并判断返回值的布尔类型 注意这里有校验
{
printf("Set Parity Error\n"); //为FALSE则表示设置错误
exit(1); //
}
printf("3\n");
int n=2;
while(1) //主函数大循环
{
// printf("write abcdefg\n");
if(n>=0)
{
w=write(fd,"start",5);
printf("w=%d\n",w);
n--;
}
sleep(1);
if((nread = read(fd,buff_r,512))>0) //读字节的个数为正
{
buff_r[nread]='\0'; //将读到的字节下一个单元写入空字符NULL
printf("read:%d\n",nread);
sleep(1);
//打印读到的字符数组元素
for(i=0;i<nread;i++)
{
printf("%02x \n",buff_r[i]);
}
printf("\n");
// printf("\nLen %d\n",nread); //
sleep(1);
w=write(fd,buff_r,(nread)); //将读到的字符原样输出
printf("w1=%d\n",w);
}
printf("recieved...len=%d\n",nread);
if(1)
{
// usleep(10);
}
}
close(fd); //
exit(0); //
return 0; //
}
先source build/envsetup.sh
lunch sabresd_6dq-user
./mmm serial
[2014/9/2 14:22:58] shilin wang: LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := serialtest
LOCAL_SRC_FILES := serial.c
include $(BUILD_EXECUTABLE)
#include $(BUILD_SHARED_LIBRARY)
[2014/9/2 14:23:13] shilin wang: 就这几句就行了