首先编译并安装驱动文件
drivers/usb/class/cdc-acm.ko
drivers/net/usb/usbnet.ko
drivers/net/usb/cdc_ether.ko
drivers/net/usb/rndis_host.ko
安装顺序如下：
insmod cdc-acm.ko
insmod usbnet.ko
insmod cdc_ether.ko
insmod rndis_host.ko
然后调用sample_serial串口读写程序发送AT指令
初始直接使用echo cat 来读写AT指令，发现不太正常，写个简单的读写AT指令的串口程序(sample_serial)来辅助联网。
sample_serial /dev/ttyACM1 query
sample_serial /dev/ttyACM1 auto4g
如果读取到NETOPEN SUCCESS，表明模块联网成功。
ifconfig eth1 up
udhcpc -i eth1
ping www.baidu.com
file sample_serial.c
#include
#include
#include
#include
#ifndef FALSE
#define FALSE (0)
#endif
#ifndef TRUE
#define TRUE (!FALSE)
#endif
int speed_arr[] = {B115200, B38400, B19200, B9600, B4800, B2400, B1200, B300,
B115200, B38400, B19200, B9600, B4800, B2400, B1200, B300, };
int name_arr[] = {115200, 38400, 19200, 9600, 4800, 2400, 1200, 300,
115200, 38400, 19200, 9600, 4800, 2400, 1200, 300, };
void set_speed(int fd, int speed) {
int i;
int status;
struct termios Opt;
tcgetattr(fd, &Opt);
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);
}
}
}
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;
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;
tcflush(fd, TCIFLUSH);
options.c_cc[VTIME] = 150; /* 设置超时15 seconds*/
options.c_cc[VMIN] = 0; /* Update the options and do it NOW */
if (tcsetattr(fd, TCSANOW, &options) != 0)
{
perror("SetupSerial 3");
return (FALSE);
}
options.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG); /*Input*/
options.c_oflag &= ~OPOST; /*Output*/
return (TRUE);
}
int write_atcmd(int fd, char *cmd) {
char *wbuf = malloc(strlen(cmd) + 3);
int ret = 0;
if (wbuf == NULL){
perror("malloc");
return -1;
}
memset(wbuf, 0, strlen(cmd) + 3);
sprintf(wbuf, "%s\r\n", cmd);
printf("===>[%d][%s]\r\n", strlen(wbuf), wbuf);
ret = write(fd, wbuf, strlen(wbuf));
if (ret != strlen(wbuf))
printf("write return %d !!!\r\n", ret);
free(wbuf);
return ret;
}
int read_atcmd(int fd, char *match_header, char *data_buf) {
int ret = 0;
data_buf[0] = 0;
printf("match_header:[%s]\r\n", match_header);
char *p_match = NULL;
char *rbuf[1024];
memset(rbuf, 0, sizeof(rbuf));
while(1) {
memset(rbuf, 0, sizeof(rbuf));
int r_ret = read(fd, rbuf, 1024);
if(r_ret == 0)
continue;
if(r_ret == -1) {
ret = -1;
break;
}
rbuf[r_ret] = 0;
if((strlen(rbuf) == 1) && (rbuf[0]==0x0d || rbuf[0]==0x0a)) {
continue;
}
//printf("<===[%d][%s]\r\n", r_ret, rbuf);
p_match = strstr(rbuf, match_header);
if (p_match != NULL){
memcpy(data_buf, p_match, strlen(p_match));
data_buf[strlen(p_match)] = 0;
printf("<===[%d][%s]\r\n", strlen(data_buf), data_buf);
break;
}
}
return ret;
}
int main(int argc, char *argv[]){
int i = 0;
int fd = NULL;
char buffer[1024] = {0};
int w_ret, r_ret;
if (argc < 2) {
printf("Usage: %s dev_path [write_cmd]\r\n", argv[0]);
exit(1);
}
for (i = 0; i < argc; i++) {
printf("[%d/%d] %s\r\n", i, argc, argv[i]);
}
fd = open(argv[1], O_RDWR);
if (fd < 0) {
perror(argv[1]);
exit(1);
}
set_speed(fd, 115200);
if (set_parity(fd, 8, 1, 'N') == FALSE) {
printf("Set Parity Error\n");
exit(0);
}
if (argc >= 3) {
memset(buffer, 0, sizeof(buffer));
if (memcmp("query", argv[2], strlen(argv[2])) == 0) {
write_atcmd(fd, "AT+CEREG?");
read_atcmd(fd, "+CEREG:", buffer);
write_atcmd(fd, "AT+CSQ");
read_atcmd(fd, "+CSQ:", buffer);
write_atcmd(fd, "AT+COPS?");
read_atcmd(fd, "+COPS:", buffer);
write_atcmd(fd, "AT+NETOPEN?");
read_atcmd(fd, "+NETOPEN:", buffer);
} else if (memcmp("auto4g", argv[2], strlen(argv[2])) == 0) {
write_atcmd(fd, "AT+QICSGP=1,1,\"ctnet\",\"\",\"\"");
write_atcmd(fd, "AT+QICSGP?");
read_atcmd(fd, "+QICSGP:", buffer);
read_atcmd(fd, "+QICSGP:", buffer);
read_atcmd(fd, "+QICSGP:", buffer);
write_atcmd(fd, "AT+NETOPEN");
read_atcmd(fd, "+NETOPEN:", buffer);
read_atcmd(fd, "+NETOPEN:", buffer);
read_atcmd(fd, "+NETOPEN:", buffer);
} else {
if(memcmp("AT", argv[2], 2) != 0){
printf("%s not AT command\r\n", argv[2]);
exit(1);
}
write_atcmd(fd, argv[2]);
read_atcmd(fd, argv[2], buffer);
}
} else {
while(1) {
memset(buffer, 0, sizeof(buffer));
r_ret = read(fd, buffer, 1024);
if(r_ret == 0)
continue;
if(r_ret == -1)
break;
buffer[r_ret] = 0;
if((strlen(buffer) == 1) && (buffer[0]==0x0d || buffer[0]==0x0a)) {
continue;
}
printf("<===[%d][%s]\r\n", r_ret, buffer);
}
}
close(fd);
printf("-------------the end-------------\r\n");
}