+ time_t mtime;
+ struct tm mtm;
+ unsigned short year;
+ unsigned char data[32];
+
+ mtime = time(NULL);
+ localtime_r(&mtime, &mtm);
+
+ year = mtm.tm_year + 1900;
+ data[0] = (year & 0x0f00) >> 8;
+ data[1] = (year & 0x00ff);
+ data[2] = mtm.tm_mon + 1;
+ data[3] = mtm.tm_mday;
+ data[4] = mtm.tm_wday;
+ data[5] = mtm.tm_hour;
+ data[6] = mtm.tm_min;
+ data[7] = mtm.tm_sec;
+ data[8] = clk1224;
+ data[9] = date_fmt;
+
+ mw_send_packet(mw_fd, MW_SET_REAL_TIME_CLOCK, 0, data, 10);
+}
+
+/*
+ * watch responses, events or notifications
+ */
+void mw_get_real_time_clock_response(int mw_fd, unsigned char *rtcrsp, int len)
+{
+ struct tm mtm;
+ unsigned short year;
+ unsigned char clk1224, date_fmt;
+
+ if (len != 10) {
+ fprintf(stderr, "get real time clock response too short %d != 10\n", len);
+ return;
+ }
+
+ year = *(unsigned short *)rtcrsp;
+ mtm.tm_year = year - 1900;
+ mtm.tm_mon = rtcrsp[2] - 1;
+ mtm.tm_mday = rtcrsp[3];
+ mtm.tm_wday = rtcrsp[4];
+ mtm.tm_hour = rtcrsp[5];
+ mtm.tm_min = rtcrsp[6];
+ mtm.tm_sec = rtcrsp[7];
+ clk1224 = rtcrsp[8];
+ date_fmt = rtcrsp[9];
+
+ fprintf(stderr, "watch RTC is %s, clock format is %s, date format is %s\n", asctime(&mtm), clk1224 ? "24h" : "AM/PM", date_fmt ? "DD/MM" : "MM/DD");
+}
+
+void mw_get_battery_voltage_response(int mw_fd, unsigned char *batrsp, int len)
+{
+ unsigned short voltage = *(unsigned short *)batrsp;
+ unsigned char power_good = batrsp[2];
+ unsigned char bat_charging = batrsp[3];
+
+ fprintf(stderr, "battery is at %dV, %s and %s\n", voltage, power_good ? "power is good" : "power fault", bat_charging ? "charging" : "not charging");
+}
+
+int decode_frame(int mw_fd, unsigned char *buf, int len)
+{
+ unsigned short crc;
+ unsigned char msglen;
+ unsigned char msgtype;
+ unsigned char msgopt;
+ unsigned char *msgdata;
+
+ /* check frame */
+ crc = *(unsigned short *)(buf+len-2);
+ if (crc != crc16ccitt(buf, len-2)) {
+ fprintf(stderr, "decode frame CRC error\n");
+ return 1;
+ } else
+ fprintf(stderr, "decode frame CRC OK\n");
+ if (buf[0] != MW_SOF) {
+ fprintf(stderr, "decode frame SOF not found\n");
+ return 1;
+ } else
+ fprintf(stderr, "decode frame found SOF\n");
+
+ msglen = buf[1];
+ msgtype = buf[2];
+ msgopt = buf[3];
+ msgdata = (buf+4);
+
+ switch (msgtype) {
+ case MW_GET_REAL_TIME_CLOCK_RSP:
+ mw_get_real_time_clock_response(mw_fd, msgdata, len-4-2);
+ break;
+ case MW_GET_INFORMATION_STRING_RSP:
+ msgdata[len-4-2] = 0;
+ fprintf(stderr, "Got info string '%s'\n", (msgdata+4));
+ break;
+ case MW_READ_BATTERY_VOLTAGE_RSP:
+ mw_get_battery_voltage_response(mw_fd, msgdata, len-4-2);
+ break;
+ case MW_LOW_BATTERY_WARNING_MSG:
+ fprintf(stderr, "Watch battery low, please connect charger\n");
+ break;
+ case MW_LOW_BATTERY_BT_OFF_MSG:
+ fprintf(stderr, "Watch battery extremely low - radio will turn off\n");
+ break;
+ default:
+ fprintf(stderr, "Unkown msgtype 0x%02x\n", msgtype);
+ break;
+ };
+
+ return 0;