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Android2.1下调试3G模块（一）

分类： LINUX

2011-03-30 15:57:54

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
  1. #include <termios.h>

  3. static int urc_fd = -1; /* fd of the URC channel */
  4. static char s_URCBuffer[MAX_AT_RESPONSE+1];
  5. static char *s_URCBufferCur = s_URCBuffer;
  6. static pthread_t s_tid_reader_urc;
  1. static const char *urc_readline()
  2. {
  3.     ssize_t count;
  4.     char *p_read = NULL;
  5.     char *p_eol = NULL;
  6.     char *ret;
  8.     if (*s_URCBufferCur == '\0') {
  9.         s_URCBufferCur = s_URCBuffer;
  10.         *s_URCBufferCur = '\0';
  11.         p_read = s_URCBuffer;
  12.     } else {
  13.         while (*s_URCBufferCur == '\r' || *s_URCBufferCur == '\n')
  14.             s_URCBufferCur++;
  15.         p_eol = findNextEOL(s_URCBufferCur);
  16.         if (p_eol == NULL) {
  17.             size_t len;
  18.             len = strlen(s_URCBufferCur);
  19.             memmove(s_URCBuffer, s_URCBufferCur, len + 1);
  20.             p_read = s_URCBuffer + len;
  21.             s_URCBufferCur = s_URCBuffer;
  22.         }
  23.     }
  24.     while (p_eol == NULL) {
  25.         if (0 == MAX_AT_RESPONSE - (p_read - s_URCBuffer)) {
  26.             LOGE("ERROR: Input line exceeded buffer\n");
  27.             s_URCBufferCur = s_URCBuffer;
  28.             *s_URCBufferCur = '\0';
  29.             p_read = s_URCBuffer;
  30.         }
  31.         do {
  32.             count = read(urc_fd, p_read, MAX_AT_RESPONSE - (p_read - s_URCBuffer));
  33.         } while (count < 0 && errno == EINTR);
  34.         if (count > 0) {
  35.             AT_DUMP( "<< ", p_read, count );
  36.             s_readCount += count;
  37.             p_read[count] = '\0';
  38.             while (*s_URCBufferCur == '\r' || *s_URCBufferCur == '\n')
  39.                 s_URCBufferCur++;
  40.             p_eol = findNextEOL(s_URCBufferCur);
  41.             p_read += count;
  42.         } else if (count <= 0) {
  43.             if(count == 0) {
  44.                 LOGD("atchannel: EOF reached");
  45.             } else {
  46.                 LOGD("atchannel: read error %s", strerror(errno));
  47.             }
  48.             return NULL;
  49.         }
  50.     }
  51.     ret = s_URCBufferCur;
  52.     *p_eol = '\0';
  53.     s_URCBufferCur = p_eol + 1; 
  54.     LOGD("AT< %s\n", ret);
  55.     return ret;
  56. }

  58. static void *urc_readerLoop(void *arg)
  59. {
  60.     for (;;) {
  61.         const char * line;
  62.         line = urc_readline();
  63.         if (line == NULL) {
  64.             break;
  65.         }
  66.         if(isSMSUnsolicited(line)) {
  67.             char *line1;
  68.             const char *line2;
  69.             line1 = strdup(line);
  70.             line2 = readline();
  71.             if (line2 == NULL) {
  72.                 break;
  73.             }
  74.             if (s_unsolHandler != NULL) {
  75.                 s_unsolHandler (line1, line2);
  76.             }
  77.             free(line1);
  78.         } else {
  79.             processLine(line);
  80.         }
  81.     }
  82.     onReaderClosed();
  83.     return NULL;
  84. }
（3）修改ril/reference-ril/atchannel.c中的at_open函数，增加HUAWEI_EM770W宏控制的代码
  1.     pthread_attr_init (&attr);
  2.     pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);

  4. #ifdef HUAWEI_EM770W
  5.     int fd2 = -1;
  6.     while(fd2 < 0) {
  7.         fd2 = open ("/dev/ttyUSB2", O_RDWR);
  8.         if (fd2 < 0) {
  9.             perror ("opening URC interface. retrying...");
  10.             sleep(10);
  11.         }
  12.     }
  13.     if(fd2 > 0) {
  14.         urc_fd = fd2;
  15.         struct termios ios;
  16.         tcgetattr( fd2, &ios );
  17.         ios.c_lflag = 0;
  18.         tcsetattr( fd2, TCSANOW, &ios );
  19.     }
  20.     ret = pthread_create(&s_tid_reader_urc, &attr, urc_readerLoop, &attr);
  21.     if (ret < 0) {
  22.         perror ("pthread_create");
  23.         return -1;
  24.     }
  25. #endif

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

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

  1. +#include <cutils/properties.h>

  3. -#define PPP_TTY_PATH "/dev/omap_csmi_tty1"
  4. +#define PPP_TTY_PATH "/dev/ppp0"

  6. - /* Not muted */
  7. - at_send_command("AT+CMUT=0", NULL);
  8. + /* Set muted */
  9. + at_send_command("AT+CMUT=1", NULL);

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

  14.      /*    
  15.      asprintf(&cmd, "AT+CGDCONT=1,\"IP\",\"%s\",,0,0", apn);
  16.      //FIXME check for error here
  17.      err = at_send_command(cmd, NULL);
  18.      free(cmd);
  19.      // Set required QoS params to default
  20.      err = at_send_command("AT+CGQREQ=1", NULL);
  21.      // Set minimum QoS params to default
  22.      err = at_send_command("AT+CGQMIN=1", NULL);
  23.      // packet-domain event reporting
  24.      err = at_send_command("AT+CGEREP=1,0", NULL);
  25.      // Hangup anything that's happening there now
  26.      err = at_send_command("AT+CGACT=1,0", NULL);
  27.      // Start data on PDP context 1
  28.      err = at_send_command("ATD*99***1#", &p_response);
  29.      if (err < 0 || p_response->success == 0) {
  30.          goto error;
  31.      }
  32.      */
  34.    + property_set("ctl.start","pppd_gprs");
  35.    RIL_onRequestComplete(t, RIL_E_SUCCESS, response, sizeof(response));
  36.    at_response_free(p_response);
（5）在ril/rild/rild.c中修改的代码
  1. +#if 0
  2.      /* special override when in the emulator */
  3. -#if 1
  4.      {
  5.          static char* arg_overrides[3];
  6.          static char arg_device[32];

  8.  //switchUser();
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