Android 2.1下调试3G模块
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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。
本篇文章来源于 Linux公社网站(www.linuxidc.com) 原文链接：http://www.linuxidc.com/Linux/2011-08/40117p2.htm
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。
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