mbtk/libgsw_lib/gsw_gnss_interface.c

#include <stdio.h>
#include <string.h>
#include <strings.h>
#include <stdlib.h>
#include <errno.h>
#include <fcntl.h>
#include <signal.h>
#include <sys/types.h>
#include <unistd.h>
#include <pthread.h>
#include <termios.h>
#include <time.h>
#include <sys/ioctl.h>
#include <dlfcn.h>
#include <stdint.h>
#include <stdbool.h>

#include "gsw_gnss_interface.h"

#define MBTK_GNSS_IND_LOCATION (1)      // 1
#define MBTK_GNSS_IND_NMEA (1 << 1)     // 2
#define QSER_GNSS_TIMEOUT 5

#ifndef LOG_ERR_LEVEL
#define LOG_ERR_LEVEL  3      /* error conditions */
#endif
#ifndef LOG_WARN_LEVEL
#define LOG_WARN_LEVEL 4   /* warning conditions */
#endif
#ifndef LOG_INFO_LEVEL
#define LOG_INFO_LEVEL 6      /* informational */
#endif
#ifndef LOG_DEBUG_LEVEL
#define LOG_DEBUG_LEVEL 7     /* debug-level messages */
#endif
#ifndef LOG_VERBOSE_LEVEL
#define LOG_VERBOSE_LEVEL 8
#endif

#define GSW_GNSS "[HAL][GSW_GNSS]"


#define LOGV(fmt, args ...) \
    do{ \
        char *file_ptr_1001 = __FILE__; \
        char *ptr_1001 = file_ptr_1001 + strlen(file_ptr_1001) - 1;   \
        char line_1001[10] = {0}; \
        sprintf(line_1001, "%d", __LINE__); \
        while(ptr_1001 >= file_ptr_1001 && *ptr_1001){ \
            if(*ptr_1001 == '/') \
                 break; \
            ptr_1001--; \
        } \
        fun_ptr_log(LOG_VERBOSE_LEVEL, "%s#%s: "GSW_GNSS"" fmt, ptr_1001 + 1, line_1001, ##args); \
    } while(0)

#define LOGI(fmt, args...) \
    do{ \
        char *file_ptr_1001 = __FILE__; \
        char *ptr_1001 = file_ptr_1001 + strlen(file_ptr_1001) - 1;   \
        char line_1001[10] = {0}; \
        sprintf(line_1001, "%d", __LINE__); \
        while(ptr_1001 >= file_ptr_1001 && *ptr_1001){ \
            if(*ptr_1001 == '/') \
                 break; \
            ptr_1001--; \
        } \
        fun_ptr_log(LOG_INFO_LEVEL, "%s#%s: "GSW_GNSS"" fmt, ptr_1001 + 1, line_1001, ##args); \
    } while(0)

#define LOGD(fmt, args...) \
    do{ \
        char *file_ptr_1001 = __FILE__; \
        char *ptr_1001 = file_ptr_1001 + strlen(file_ptr_1001) - 1;   \
        char line_1001[10] = {0}; \
        sprintf(line_1001, "%d", __LINE__); \
        while(ptr_1001 >= file_ptr_1001 && *ptr_1001){ \
            if(*ptr_1001 == '/') \
                 break; \
            ptr_1001--; \
        } \
        fun_ptr_log(LOG_DEBUG_LEVEL, "%s#%s: "GSW_GNSS"" fmt, ptr_1001 + 1, line_1001, ##args); \
    } while(0)

#define LOGW(fmt, args...) \
    do{ \
        char *file_ptr_1001 = __FILE__; \
        char *ptr_1001 = file_ptr_1001 + strlen(file_ptr_1001) - 1;   \
        char line_1001[10] = {0}; \
        sprintf(line_1001, "%d", __LINE__); \
        while(ptr_1001 >= file_ptr_1001 && *ptr_1001){ \
            if(*ptr_1001 == '/') \
                 break; \
            ptr_1001--; \
        } \
        fun_ptr_log(LOG_WARN_LEVEL, "%s#%s: "GSW_GNSS"" fmt, ptr_1001 + 1, line_1001, ##args); \
    } while(0)

#define LOGE(fmt, args...) \
    do{ \
        char *file_ptr_1001 = __FILE__; \
        char *ptr_1001 = file_ptr_1001 + strlen(file_ptr_1001) - 1;   \
        char line_1001[10] = {0}; \
        sprintf(line_1001, "%d", __LINE__); \
        while(ptr_1001 >= file_ptr_1001 && *ptr_1001){ \
            if(*ptr_1001 == '/') \
                 break; \
            ptr_1001--; \
        } \
        fun_ptr_log(LOG_ERR_LEVEL, "%s#%s: "GSW_GNSS"" fmt, ptr_1001 + 1, line_1001, ##args); \
    } while(0)

#define MOPEN_GNSS_NMEA_MAX_LENGTH  255                 /**  NMEA string maximum length. */
static gsw_gnss_cb *gsw_cb = NULL;
static bool inited = false;
static bool strated = false;

typedef void (*mbtk_gnss_callback_func)(uint32_t ind_type, const void* data, uint32_t data_len);
typedef void (*mbtk_log)(int level, const char *format,...);
static mbtk_log fun_ptr_log = NULL;

int (*mbtk_gnss_init)(mbtk_gnss_callback_func cb);
int (*mbtk_gnss_deinit)();

int (*mbtk_gnss_ind_set)(uint32_t ,int);
int (*mbtk_gnss_open)(int, int);
int (*mbtk_gnss_close)(int);
int (*mbtk_gnss_setting)(const char *setting_cmd, int);

int (*mbtk_gnss_eph_download)(int);
int (*mbtk_gnss_eph_inject)(int);

int gnss_freq = -1;
GSW_GNSS_MODE_CONFIGURATION gnss_startmode = -1;
GSW_CONF_SWITCH gnss_switch_op = -1;
void *dlHandle_gnss;
char *lynqLib_gnss = "/lib/libmbtk_lib.so";

typedef enum
{
    E_MT_LOC_MSG_ID_LOCATION_INFO = 1, /**< pv_data = & mopen_location_info_t */
    E_MT_LOC_MSG_ID_NMEA_INFO = 3, /**< pv_data = & mopen_gnss_nmea_info_t */
} e_msg_id_t;

typedef struct
{
    int64_t     timestamp;                              /**<   System Timestamp, marked for when got the nmea data */
    int         length;                                 /**<   NMEA string length. */
    char        nmea[MOPEN_GNSS_NMEA_MAX_LENGTH + 1];   /**<   NMEA string.*/
}mopen_gnss_nmea_info_t;  /* Message */

typedef struct
{
    uint32_t    size;                   /**<   Set to the size of mcm_gps_location_t. */
    int flags;                          /**<   Contains GPS location flags bits. */
    int position_source;                /**<   Provider indicator for HYBRID or GPS. */ //功能暂未实现，可不用添加进结构体
    double      latitude;               /**<   Latitude in degrees. */
    double      longitude;              /**<   Longitude in degrees. */
    double      altitude;               /**<   Altitude in meters above the WGS 84 reference ellipsoid. */
    float       speed;                  /**<   Speed in meters per second. */
    float       bearing;                /**<   Heading in degrees. */ //功能暂未实现，可不用添加进结构体
    float       accuracy;               /**<   Expected accuracy in meters. */ //功能暂未实现，可不用添加进结构体
    int64_t     timestamp;              /**<   Timestamp for the location fix in UTC million-second base.  */
    int32_t     is_indoor;              /**<   Location is indoors. */ //功能暂未实现，可不用添加进结构体
    float       floor_number;           /**<   Indicates the floor number. */
}mopen_location_info_t;//功能暂未实现，可不用添加进结构体


typedef struct {
    uint32_t      flags;
    double      latitude;               /**<   Latitude in degrees. */
    double      longitude;              /**<   Longitude in degrees. */
    double      altitude;               /**<   Altitude in meters above the WGS 84 reference ellipsoid. */
    float       speed;                  /**<   Speed in meters per second. */
    float       bearing;                /**<   Heading in degrees. */
    int64_t     timestamp;              /**<   Timestamp for the location fix in UTC million-second base.  */
} mbtk_gnss_location_info_t;

typedef struct{
    GSW_GNSS_MODE_CONFIGURATION start_mode;
    gnss_freq_type freq;
    gsw_gnss_cb callback;
}gsw_gnss_init_configure_t;

typedef enum{
    MODE_GPS = 1,                               /**< GPS only */
    MODE_BEIDOU,                                /**< BEIDOU only*/
    MODE_GPS_BEIDOU,                            /**< GPS+BEIDOU */
    MODE_GLONASS,                               /**< GLONASS only */
    MODE_GPS_GLONASS,                           /**< GPS+GLONASS */
    MODE_GLONASS_BEIDOU,                        /**< GLONASS+BEIDOU */ /* The type does not support this type */
    MODE_GPS_GLONASS_BEIDOU,                    /**< GPS+GLONASS+BEIDOU */ /* The type does not support this type */          
    MODE_GALILEO,                               /**< GALILEO only */ 
    MODE_GPS_GALILEO,                           /**< GPS+GALILEO */ 
    MODE_BEIDOU_GALILEO,                        /**< BEIDOU+GALILEO */ 
    MODE_GPS_BEIDOU_GALILEO,                    /**< GPS+BEIDOU+GALILEO */ 
    MODE_GLONASS_GALILEO,                       /**< GLONASS+GALILEO */ 
    MODE_GPS_GLONASS_GALILEO,                   /**< GPS+GLONASS+GALILEO */ 
    MODE_BEIDOU_GLONASS_GALILEO,                /**< BEIDOU+GLONASS+GALILEO */ /* The type does not support this type */
    MODE_END = -1,                              /**< init value */
}GSW_GNSS_MODE_CONFIGURATION_HD;


GSW_GNSS_MODE_CONFIGURATION_HD map_gnss_mode(GSW_GNSS_MODE_CONFIGURATION mode)
{
    switch (mode)
    {
        case GSW_MODE_GPS_GLONASS:
            return MODE_GPS_GLONASS;
        case GSW_MODE_GPS_BEIDOU:
            return MODE_GPS_BEIDOU;
        case GSW_MODE_GPS_GLONASS_BEIDOU:
            return MODE_END;
        case GSW_MODE_GPS:
            return MODE_GPS;
        case GSW_MODE_BEIDOU:
            return MODE_BEIDOU;
        case GSW_MODE_GLONASS:
            return MODE_GLONASS;
        case GSW_MODE_GPS_GLONASS_BEIDOU_GALILEO:
            return MODE_END;
        case GSW_MODE_GPS_GALILEO:
            return MODE_GPS_GALILEO;
        case GSW_MODE_GPS_GLONASS_GALILEO:
            return MODE_GPS_GLONASS_GALILEO;
        case GSW_MODE_GPS_GALILEO_ONLY:
            return MODE_GALILEO;
        case GSW_MODE_GPS_GLONASS_BEIDOU_GALILEO_NAVIC:
            return MODE_END;
        case GSW_MODE_GNSS_END:
            return MODE_END;
        default:
            return MODE_END;
    }
}  

int mbtk_gnss_set_VTG()
{
    int ret;
    char param_buf[32] = {0};
    snprintf(param_buf, 32, "$MSGCFG,2,1000");
    mbtk_gnss_setting=(int(*)(const char *setting_cmd, int))dlsym(dlHandle_gnss, "mbtk_gnss_setting");
    ret = mbtk_gnss_setting(param_buf, QSER_GNSS_TIMEOUT);
    if(ret != 0)
    {
        LOGE("[qser_gnss] mbtk_gnss_setting fail.ret = [%d]", ret);
        return GSW_HAL_NORMAL_FAIL;
    }
    return GSW_HAL_SUCCESS;
}

/**
 * @brief SDK interface to set gnss sampling frequency, support 1Hz、2Hz、5Hz
 * @param  [in] freq
 * @retval 0: success
 * @retval other: fail
 */
int gsw_gnss_set_freq(int freq)
{
    if(!inited)
        return GSW_HAL_NORMAL_FAIL;

    int ret;
    if (!strated)
    {
        gnss_freq = freq;
        return GSW_HAL_SUCCESS;
    }
    char param_buf[32] = {0};
    snprintf(param_buf, 32, "$FREQCFG,%d", freq);
    mbtk_gnss_setting=(int(*)(const char *setting_cmd, int))dlsym(dlHandle_gnss, "mbtk_gnss_setting");
    ret = mbtk_gnss_setting(param_buf, QSER_GNSS_TIMEOUT);
    if(ret != 0)
    {
        LOGE("[qser_gnss] mbtk_gnss_setting fail.ret = [%d]", ret);
        return GSW_HAL_NORMAL_FAIL;
    }
    return GSW_HAL_SUCCESS;
}

/**
 * @brief SDK interface to set gnss start mode,specific mode refreence GSW_HAL_GNSS_MODE_CONFIGURATION
 * @param  [in] start_mode 
 * @retval 0: success
 * @retval other: fail
 */
int32_t gsw_gnss_set_start_mode(GSW_GNSS_MODE_CONFIGURATION start_mode)
{
    if(!inited)
        return GSW_HAL_NORMAL_FAIL;
    int ret;
    if (!strated)
    {
        gnss_startmode = start_mode;
        return GSW_HAL_SUCCESS;
    }
    char param_buf[32] = {0};
    snprintf(param_buf, 32, "$SYSCFG,%d", map_gnss_mode(start_mode));
    if(map_gnss_mode(start_mode) == -1)
    {
        LOGE("[qser_gnss] mbtk_gnss_start_mode con't support");
        return GSW_HAL_NORMAL_FAIL;
    }
    mbtk_gnss_setting=(int(*)(const char *setting_cmd, int))dlsym(dlHandle_gnss, "mbtk_gnss_setting");
    ret = mbtk_gnss_setting(param_buf, QSER_GNSS_TIMEOUT);
    if(ret != 0)
    {
        LOGE("[qser_gnss] mbtk_gnss_setting fail.ret = [%d]", ret);
        return GSW_HAL_NORMAL_FAIL;
    }
    return GSW_HAL_SUCCESS;
}

/**
 * @brief SDK interface to set EPO switch if open or close
 * @param  [in] switch_op
 * @retval 0: success
 * @retval other: fail
 */
int32_t gsw_gnss_epo_switch(GSW_CONF_SWITCH switch_op)
{
    if(!inited)
        return GSW_HAL_NORMAL_FAIL;
    int ret;
    if (!strated)
    {
        gnss_switch_op = switch_op;
        return GSW_HAL_SUCCESS;
    }
    
    if(switch_op)
    {
        mbtk_gnss_eph_download=(int(*)(int))dlsym(dlHandle_gnss, "mbtk_gnss_eph_download");
        ret = mbtk_gnss_eph_download(QSER_GNSS_TIMEOUT);
        if(ret != 0)
        {
            LOGE("[qser_gnss] mbtk_gnss_eph_download fail.ret = [%d]", ret);
            return GSW_HAL_NORMAL_FAIL;
        }
        mbtk_gnss_eph_inject=(int(*)(int))dlsym(dlHandle_gnss, "mbtk_gnss_eph_inject");
        ret = mbtk_gnss_eph_inject(QSER_GNSS_TIMEOUT);
        if(ret != 0)
        {
            LOGE("[qser_gnss] mbtk_gnss_eph_inject fail.ret = [%d]", ret);
            return GSW_HAL_NORMAL_FAIL;
        }
    }
    return GSW_HAL_SUCCESS;
}

static void gnss_callback(uint32_t ind_type, const void* data, uint32_t data_len)
{
    if(data == NULL || data_len <= 0)
    {
        LOGE("[GSW_gnss] data is NULL.");
        return;
    }

    if(gsw_cb == NULL)
    {
        //LOGE("[qser_gnss] qser_gnss_callback is NULL.");
        return;
    }
    
    if(ind_type == MBTK_GNSS_IND_LOCATION && gsw_cb->gsw_location_cb != NULL) {
        if(data_len != sizeof(mbtk_gnss_location_info_t))
		{
			LOGE("[GSW_gnss] data size error");
			return;
		}
		GSW_GNSS_LOCATION_EXT_T gsw_location;
        GSW_GNSS_LOCATION_T gsw_location_t = {0};
        mbtk_gnss_location_info_t *locl_info = (mbtk_gnss_location_info_t *)data;
        gsw_location_t.altitude = locl_info->altitude;
        gsw_location_t.latitude = locl_info->latitude;
        gsw_location_t.longitude = locl_info->longitude;
        gsw_location_t.speed = locl_info->speed;
        gsw_location_t.bearing = locl_info->bearing;
        gsw_location_t.timestamp = locl_info->timestamp;
        gsw_location_t.flags = locl_info->flags;
        gsw_location.legacyLocation = gsw_location_t;
        gsw_cb->gsw_location_cb(&gsw_location);  
    } else if(ind_type == MBTK_GNSS_IND_NMEA && gsw_cb->gsw_nmea_cb != NULL) {
        mopen_gnss_nmea_info_t qser_nmea = {0};
        memset(&qser_nmea, 0x0, sizeof(mopen_gnss_nmea_info_t));
        qser_nmea.length = data_len;
        memcpy(qser_nmea.nmea, (char *)data, data_len);
        //qser_nmea.timestamp = qser_get_gnss_time_sec(data, data_len);
        gsw_cb->gsw_nmea_cb(data,data_len);
    } else {
        LOGD("Unknown IND : %d\n", ind_type);
    }
}

int32_t gsw_gnss_init(void)
{
    int ret;
    if(!inited)
    {
        dlHandle_gnss = dlopen(lynqLib_gnss, RTLD_NOW);
        fun_ptr_log = (mbtk_log)dlsym(dlHandle_gnss, "mbtk_log");
        if(fun_ptr_log == NULL || dlHandle_gnss == NULL)
        {
            return GSW_HAL_NORMAL_FAIL;
        }
        mbtk_gnss_init=(int(*)(mbtk_gnss_callback_func))dlsym(dlHandle_gnss, "mbtk_gnss_init");
        ret = mbtk_gnss_init(gnss_callback);
        if(ret == 0)
        {
            mbtk_gnss_ind_set=(int(*)(uint32_t ,int))dlsym(dlHandle_gnss, "mbtk_gnss_ind_set");
            ret = mbtk_gnss_ind_set(MBTK_GNSS_IND_NMEA |MBTK_GNSS_IND_LOCATION, QSER_GNSS_TIMEOUT);
            if(ret == 0)
            {
                inited = true;
            }
            else
            {
                LOGE("[GSW_gnss] init mbtk_gnss_ind_set() fail.ret = [%d]", ret);
                return GSW_HAL_NORMAL_FAIL;
            }
        }
        else
        {
            LOGE("[GSW_gnss] mbtk_gnss_init() fail.ret = [%d]", ret);
            return GSW_HAL_NORMAL_FAIL;
        }
    }

    return GSW_HAL_SUCCESS;
}

/**
 * @brief SDK interface to registered callback function
 * @param [in] callback
 * @retval 0: success
 * @retval other: fail
 */
int32_t gsw_gnss_reg_cb_group(gsw_gnss_cb callback)
{
    if(!inited)
        return GSW_HAL_NORMAL_FAIL;
    if(callback.gsw_location_cb == NULL && callback.gsw_nmea_cb == NULL)
    {
        LOGE("[GSW_gnss] handler_ptr is NULL.");
        return GSW_HAL_NORMAL_FAIL;
    }
    if (gsw_cb == NULL)
    {
        gsw_cb = (gsw_gnss_cb *)malloc(sizeof(gsw_gnss_cb));
        if (gsw_cb == NULL)
        {
            LOGE("[GSW_gnss] Memory allocation failed.");
            return GSW_HAL_NORMAL_FAIL;
        }
    }
    gsw_cb->gsw_location_cb = callback.gsw_location_cb;
    gsw_cb->gsw_nmea_cb = callback.gsw_nmea_cb;
    return GSW_HAL_SUCCESS;
}
/**
 * @brief SDK interface to start gnss
 * @param 
 * @retval 0: success
 * @retval other: fail
 */
int32_t gsw_gnss_start(void)
{
    int ret;
    if(!inited)
        return GSW_HAL_NORMAL_FAIL;
    ret = system("/usr/sbin/gnss_gpio.sh on > /dev/null 2>&1");
    if(ret != 0)
    {
        LOGE("[GSW_gnss] gnss_gpio.sh on fail.ret = [%d]", ret);
        return GSW_HAL_NORMAL_FAIL;
    }
    mbtk_gnss_open=(int(*)(int,int))dlsym(dlHandle_gnss, "mbtk_gnss_open");
    ret = mbtk_gnss_open(255, QSER_GNSS_TIMEOUT);
    if(ret != 0)
    {
        LOGE("[GSW_gnss] mbtk_gnss_open is error.ret = [%d]", ret);
        return GSW_HAL_NORMAL_FAIL;
    }

    strated = true;
    /*
    if (gnss_freq > 0)
        gsw_gnss_set_freq(gnss_freq);
    if (gnss_startmode >= 0)
        gsw_gnss_set_start_mode(gnss_startmode);
    if (gnss_switch_op > 0)
        gsw_gnss_epo_switch(gnss_switch_op);
    */
    mbtk_gnss_set_VTG();

    return GSW_HAL_SUCCESS;
}

/**
 * @brief SDK interface to stop gnss
 * @param 
 * @retval 0: success
 * @retval other: fail
 */
int32_t gsw_gnss_stop(void)
{
    int ret;
    if(!inited)
        return GSW_HAL_NORMAL_FAIL;
    mbtk_gnss_close=(int(*)(int))dlsym(dlHandle_gnss, "mbtk_gnss_close");
    ret = mbtk_gnss_close(QSER_GNSS_TIMEOUT);
    if(ret != 0)
    {
        LOGE("[GSW_gnss] mbtk_gnss_close is error.ret = [%d]", ret);
        return GSW_HAL_NORMAL_FAIL;
    }
    ret = system("/usr/sbin/gnss_gpio.sh off > /dev/null 2>&1");
    if(ret != 0)
    {
        LOGE("[GSW_gnss] gnss_gpio.sh off fail.ret = [%d]", ret);
        return GSW_HAL_NORMAL_FAIL;
    }
    strated = false;
    return GSW_HAL_SUCCESS;
}

/**
 * @brief SDK interface to de initialization gnss
 * @param 
 * @retval 0: success
 * @retval other: fail
 */
int32_t gsw_gnss_deinit(void)
{
    int ret;
    if(!inited)
        return GSW_HAL_NORMAL_FAIL;
    if(inited)
    {
        mbtk_gnss_deinit=(int(*)())dlsym(dlHandle_gnss, "mbtk_gnss_deinit");
        ret = mbtk_gnss_deinit();
        if(ret == 0)
        {
            inited = false;
        }
        else
        {
            LOGE("[GSW_gnss] mbtk_gnss_init() fail.ret = [%d]", ret);
            dlclose(dlHandle_gnss);
            dlHandle_gnss = NULL;
            return GSW_HAL_NORMAL_FAIL;
        }
    }

    dlclose(dlHandle_gnss);
    dlHandle_gnss = NULL;
    gnss_freq = -1;
    gnss_startmode = -1;
    gnss_switch_op = -1;
    return GSW_HAL_SUCCESS;
}

int gsw_gnss_add_lib(void)
{
    return GSW_HAL_SUCCESS;
}

/**
 * @brief SDK interface to enable XTRA switch
 * @param [in] state
 * @retval 0: success
 * @retval other: fail
 */
int32_t gsw_gnss_xtra_is_enable(gsw_xtra_state_e state)
{
    return GSW_HAL_SUCCESS;
}

/**
 * @brief SDK interface to delete aiding data,delete aiding data for cold start(1-H,2-W,3-C)
 * @param [in] switch_op
 * @retval 0: success
 * @retval other: fail
 */
int32_t gsw_gnss_delete_aiding_data(unsigned int flags) /*1-don`t delete == hot_start ; 2-delete EPH == warm start ; 3-delete all == cold start*/
{
    if(!inited)
        return GSW_HAL_NORMAL_FAIL;
    int ret;
    char param_buf[32] = {0};
    snprintf(param_buf, 32, "$RESET,%u", flags);
    mbtk_gnss_setting=(int(*)(const char *setting_cmd, int))dlsym(dlHandle_gnss, "mbtk_gnss_setting");
    ret = mbtk_gnss_setting(param_buf, QSER_GNSS_TIMEOUT);
    if(ret != 0)
    {
        LOGE("[qser_gnss] mbtk_gnss_setting fail.ret = [%d]", ret);
        return GSW_HAL_NORMAL_FAIL;
    }
    return GSW_HAL_SUCCESS;
}

/**
 * @brief init and configure gps
 * @param [in] init_configure
 * @retval 0: success
 * @retval other: fail
 */
int32_t gsw_gnss_init_configure_gps(gsw_gnss_init_configure_t init_configure)
{
    return GSW_HAL_SUCCESS;
}

int gsw_gnss_get_tail_nmea_type(char *tail_type, int len)
{
    if(NULL == tail_type){
        LOGE("get_tail_nmea_type fail, tail_type is NULL");
        return GSW_HAL_ERROR_GNSS_FAIL;
    }

    if(len >= 3){
        strcpy(tail_type, "RMC");
        return GSW_HAL_GNSS_SUCCESS;
    }else{
        LOGE("get_tail_nmea_type fail, len[%d] is too short", len);
        return GSW_HAL_ERROR_GNSS_FAIL;
    }
}