Android2.1下调试3G模块

曾几何时在Android2.1下调试3G模块，曾几何时模块厂商提供的库不能用，曾几何时只能用自己的库痛苦地调试...这一切的一切都已成往事，昔日的成功在毫无保留下成为浮云，该忘了忘记了，该记得也跟着忘记了。现如今再次调3G模块，却不知道以前如何调试，看来还是要记下来。

我采用的是华为EM770W模块，支持WCDMA网络，由于华为提供的库只支持Android2.2，所以用Android2.1就需要自己修改库源码。

 

1.修改linux内核

（1）make menuconfig：

Device Drivers  --->

    <*> OHCI HCD support 

    [*] Network device support  --->

         <*>   PPP (point-to-point protocol) support

         [*]     PPP multilink support (EXPERIMENTAL)

         [*]     PPP filtering

         <*>     PPP support for async serial ports

         <*>     PPP support for sync tty ports

         <*>     PPP Deflate compression

         <*>     PPP BSD-Compress compression

         <*>     PPP MPPE compression (encryption) (EXPERIMENTAL)

         <*>     PPP over Ethernet (EXPERIMENTAL)

         <*>     PPP over L2TP (EXPERIMENTAL)

    [*] USB support  --->

         <*>   USB Serial Converter support  --->

               <*>   USB driver for GSM and CDMA modems

（2）增加EM770W的VID和PID

修改驱动文件drivers/usb/serial/option.c，增加以下代码

#define EM770W_OPTION_VENDOR_ID 0x12d1
#define EM770W_OPTION_PRODUCT_COLT 0x1001

 

static struct usb_device_id option_ids[] = {
{ USB_DEVICE(OPTION_VENDOR_ID, OPTION_PRODUCT_COLT) },
…
{ USB_DEVICE(EM770W_OPTION_VENDOR_ID , EM770W_ OPTION_PRODUCT_COLT) },
}

驱动修改后插上3G模块，kernel运行后可在/dev下出现ttyUSB0、ttyUSB1  、ttyUSB2、ttyUSB3、ttyUSB4、ttyUSB5和ppp设备文件 

 

2.修改RIL代码

（1）在ril/reference-ril/Android.mk添加一行：

LOCAL_CFLAGS += -DHUAWEI_EM770W

（2）在ril/reference-ril/atchannel.c中增加的代码

#include <termios.h>

static int urc_fd = -1; /* fd of the URC channel */
static char s_URCBuffer[MAX_AT_RESPONSE+1];
static char *s_URCBufferCur = s_URCBuffer;
static pthread_t s_tid_reader_urc;

static const char *urc_readline()
{
    ssize_t count;
    char *p_read = NULL;
    char *p_eol = NULL;
    char *ret;

    if (*s_URCBufferCur == '\0') {
        s_URCBufferCur = s_URCBuffer;
        *s_URCBufferCur = '\0';
        p_read = s_URCBuffer;
    } else {
        while (*s_URCBufferCur == '\r' || *s_URCBufferCur == '\n')
            s_URCBufferCur++;
        p_eol = findNextEOL(s_URCBufferCur);
        if (p_eol == NULL) {
            size_t len;
            len = strlen(s_URCBufferCur);
            memmove(s_URCBuffer, s_URCBufferCur, len + 1);
            p_read = s_URCBuffer + len;
            s_URCBufferCur = s_URCBuffer;
        }
    }
    while (p_eol == NULL) {
        if (0 == MAX_AT_RESPONSE - (p_read - s_URCBuffer)) {
            LOGE("ERROR: Input line exceeded buffer\n");
            s_URCBufferCur = s_URCBuffer;
            *s_URCBufferCur = '\0';
            p_read = s_URCBuffer;
        }
        do {
            count = read(urc_fd, p_read, MAX_AT_RESPONSE - (p_read - s_URCBuffer));
        } while (count < 0 && errno == EINTR);
        if (count > 0) {
            AT_DUMP( "<< ", p_read, count );
            s_readCount += count;
            p_read[count] = '\0';
            while (*s_URCBufferCur == '\r' || *s_URCBufferCur == '\n')
                s_URCBufferCur++;
            p_eol = findNextEOL(s_URCBufferCur);
            p_read += count;
        } else if (count <= 0) {
            if(count == 0) {
                LOGD("atchannel: EOF reached");
            } else {
                LOGD("atchannel: read error %s", strerror(errno));
            }
            return NULL;
        }
    }
    ret = s_URCBufferCur;
    *p_eol = '\0';
    s_URCBufferCur = p_eol + 1;
    LOGD("AT< %s\n", ret);
    return ret;
}

static void *urc_readerLoop(void *arg)
{
    for (;;) {
        const char * line;
        line = urc_readline();
        if (line == NULL) {
            break;
        }
        if(isSMSUnsolicited(line)) {
            char *line1;
            const char *line2;
            line1 = strdup(line);
            line2 = readline();
            if (line2 == NULL) {
                break;
            }
            if (s_unsolHandler != NULL) {
                s_unsolHandler (line1, line2);
            }
            free(line1);
        } else {
            processLine(line);
        }
    }
    onReaderClosed();
    return NULL;
}

（3）修改ril/reference-ril/atchannel.c中的at_open函数，增加HUAWEI_EM770W宏控制的代码

    pthread_attr_init (&attr);
    pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);

#ifdef HUAWEI_EM770W
    int fd2 = -1;
    while(fd2 < 0) {
        fd2 = open ("/dev/ttyUSB2", O_RDWR);
        if (fd2 < 0) {
            perror ("opening URC interface. retrying...");
            sleep(10);
        }
    }
    if(fd2 > 0) {
        urc_fd = fd2;
        struct termios ios;
        tcgetattr( fd2, &ios );
        ios.c_lflag = 0;
        tcsetattr( fd2, TCSANOW, &ios );
    }
    ret = pthread_create(&s_tid_reader_urc, &attr, urc_readerLoop, &attr);
    if (ret < 0) {
        perror ("pthread_create");
        return -1;
    }
#endif

    ret = pthread_create(&s_tid_reader, &attr, readerLoop, &attr);

（4）在ril/reference-ril/reference-ril.c中修改的代码

+#include <cutils/properties.h>

-#define PPP_TTY_PATH "/dev/omap_csmi_tty1"
+#define PPP_TTY_PATH "/dev/ppp0"

- /* Not muted */
- at_send_command("AT+CMUT=0", NULL);
+ /* Set muted */
+ at_send_command("AT+CMUT=1", NULL);

- if ( fd >= 0 && !memcmp( s_device_path, "/dev/ttyS", 9 ) ) {
+ if ( fd >= 0) {

     /*
     asprintf(&cmd, "AT+CGDCONT=1,\"IP\",\"%s\",,0,0", apn);
     //FIXME check for error here
     err = at_send_command(cmd, NULL);
     free(cmd);
     // Set required QoS params to default
     err = at_send_command("AT+CGQREQ=1", NULL);
     // Set minimum QoS params to default
     err = at_send_command("AT+CGQMIN=1", NULL);
     // packet-domain event reporting
     err = at_send_command("AT+CGEREP=1,0", NULL);
     // Hangup anything that's happening there now
     err = at_send_command("AT+CGACT=1,0", NULL);
     // Start data on PDP context 1
     err = at_send_command("ATD*99***1#", &p_response);
     if (err < 0 || p_response->success == 0) {
         goto error;
     }
     */

   + property_set("ctl.start","pppd_gprs");
   RIL_onRequestComplete(t, RIL_E_SUCCESS, response, sizeof(response));
   at_response_free(p_response);

（5）在ril/rild/rild.c中修改的代码

+#if 0
     /* special override when in the emulator */
-#if 1
     {
         static char* arg_overrides[3];
         static char arg_device[32];

 //switchUser();

前面讲到了如何让修改kernel驱动和ril层代码，接下来还需要增加ppp拨号以及设备文件和服务属性。

1.修改init.gprs-pppd属性

对应文件：system/core/include/private/android_filesystem_config.h

在static struct fs_path_config android_files[]中增加：

+   { 00777, AID_ROOT,      AID_SHELL,     "system/etc/init.gprs-pppd" },

 

2.修改ttyUSB设备属性

对应文件：system/core/init/devices.c

在static struct perms_ devperms[]中增加：

+   { "/dev/ttyUSB0",       0777,   AID_RADIO,      AID_RADIO,      0 }, 
+   { "/dev/ttyUSB1",       0777,   AID_RADIO,      AID_RADIO,      0 },
+   { "/dev/ttyUSB2",       0777,   AID_RADIO,      AID_RADIO,      0 },
+   { "/dev/ttyUSB3",       0777,   AID_RADIO,      AID_RADIO,      0 },
+   { "/dev/ttyUSB4",       0777,   AID_RADIO,      AID_RADIO,      0 },
+   { "/dev/ttyUSB5",       0777,   AID_RADIO,      AID_RADIO,      0 },

 

3.修改pppd_gprs服务属性

对应文件：system/core/init/property_service.c

在property_perms[]中增加：

+   { "net.ppp0.",        AID_RADIO,    0 },

在control_perms[]中增加：

+   { "pppd_gprs",AID_RADIO, AID_LOG },

 

4.修改init.rc文件

service ril-daemon /system/bin/rild -l libreference-ril.so -- -d /dev/ttyUSB2
    socket rild stream 660 root radio
    socket rild-debug stream 660 radio system
    user root
    group radio cache inet misc

 

service pppd_gprs /etc/ppp/init.gprs-pppd /dev/ttyUSB0
    user root
    group radio cache inet misc
    disabled

 

现在3G模块上电后就可以注册上网络，并能实现电话功能，接下来还要实现gprs拨号上网功能。

 

现在开始介绍如何实现ppp拨号上网。在/system/etc下创建ppp目录，并在ppp目录下创建以下文件：

 

1.init.gprs-pppd

#!/system/bin/sh
# An unforunate wrapper script
PPPD_PID=
/system/bin/setprop "net.gprs.ppp-exit" ""
/system/bin/log -t pppd "Starting pppd"
/system/bin/pppd call gprs $*
PPPD_EXIT=$?
PPPD_PID=$!
/system/bin/log -t pppd "pppd exited with $PPPD_EXIT"
/system/bin/setprop "net.gprs.ppp-exit" "$PPPD_EXIT"
exit $PPPD_EXIT

2.gprs-connect-chat

ABORT 'BUSY'
ABORT 'NO CARRIER'
ABORT 'ERROR'
ABORT '+CME ERROR: 100'
"" AT
OK AT+CGDCONT=1,"IP","CMNET"
OK AT+CGEQREQ=1,2,128,384,0,0,0,0,"0E0","0E0",,0,0
OK AT
OK AT
OK ATS0=0
OK AT
OK AT
OK ATDT*98*1#
CONNECT

3.gprs-disconnect-chat

ABORT OK
ABORT BUSY
ABORT DELAYED
ABORT "NO ANSWER"
ABORT "NO CARRIER"
ABORT "NO DIALTONE"
ABORT VOICE
ABORT ERROR
ABORT RINGING
TIMEOUT 12
"" \\k\\k\\k\\d+++ATH
"NO CARRIER-AT-OK" ""

4.ip-up

#!/system/bin/sh
/system/bin/setprop "net.interfaces.defaultroute" "gprs"
/system/bin/setprop "net.gprs.dns1" "$DNS1"
/system/bin/setprop "net.gprs.dns2" "$DNS2"
/system/bin/setprop "net.gprs.local-ip" "$IPLOCAL"
/system/bin/setprop "net.gprs.remote-ip" "$IPREMOTE"
exit 0

5.ip-down

#!/system/bin/sh
case $1 in
    ppp1)
  echo 0 > /proc/sys/net/ipv4/ip_forward;
  ;;
esac
rm /etc/ppp/ppp*.pid
# Use interface name if linkname is not available
NAME=${LINKNAME:-"$1"}
#/system/bin/setprop "net.dns1" ""
#/system/bin/setprop "net.dns2" ""
/system/bin/setprop "net.$NAME.local-ip" ""
/system/bin/setprop "net.$NAME.remote-ip" ""

6.peers/gprs

# This is pppd script, used Huawei EM770W3G Module
# Usage: root>pppd call gprs
/dev/ttyUSB0
115200
crtscts
modem
debug
nodetach
usepeerdns
noipdefault
defaultroute
user "cmnet"
0.0.0.0:0.0.0.0
connect '/system/bin/chat -s -v -f /etc/ppp/gprs-connect-chat'
#disconnect '/bin/chat -v -f /etc/ppp/gprs-disconnect-chat'

 

文件创建好后只要在Android启动后进入"Settings(设置)"->"Wireless controls(无线网络)"->"Mobile networks(移动网络)"->"Access Points Name(接入点)",按Menu键弹出界面选择"New APN(新接入点)"，一般情况下只要填写"Name(名称)"和"APN"两项即可，"MCC"和"MNC"会随着运行商网络注册成功后自动生成，最后保存。现在就可以通过gprs上网了。

http://blog.chinaunix.net/uid-25369701-id-203378.html