作者：勇_俊 | 来源：互联网 | 2023-05-17 03:55
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
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();
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