VF50 external RTC not working

Technical Support
, , , ,
1

I am testing the RTC with a VF50 and eval board and the time is not kept after a reboot.

Here are the things I have checked:

checked the battery: 3.2V

Checked jumpers: JP23 = EXT_RTC and all X8 and X11 jumpers are installed

checked the registry entries:

HKLM\Software\Toradex\RtcSync\Protocol = 1
HKLM\Software\Toradex\RtcSync\SlaveAddr = 0x68
HKLM\Init\Launch48 = rtcsync.exe

Enabled dbg.serial output when rebooting:

Loading Touch...
I2C Warning: .\src\i2c_vyb.c, 148: Start failed
+OEMSetRealTime(2006/1/1 12:0:8.146)
+OEMSetRealTime(2001/6/19 18:10:38.000)
RTC Time restored (20.06.2001 01:10:38)
Done Touch
+OEMSetAlarmTime(2001/10/28 2:0:0.000)
-OEMSetAlarmTime(rc = 1)

Output when setting the clock in WCE:

+OEMSetRealTime(2001/6/19 18:12:9.349)
+OEMSetAlarmTime(2001/10/28 2:0:0.000)
-OEMSetAlarmTime(rc = 1)
+OEMSetRealTime(2001/6/19 18:12:9.622)
+OEMSetRealTime(2019/4/2 11:31:3.000)
+OEMSetAlarmTime(2019/11/3 2:0:0.000)
-OEMSetAlarmTime(rc = 1)
+OEMSetAlarmTime(2019/11/3 2:0:0.000)
-OEMSetAlarmTime(rc = 1)
+OEMSetAlarmTime(2019/11/3 2:0:0.000)
-OEMSetAlarmTime(rc = 1)
I2C Warning: .\src\i2c_vyb.c, 148: Start failed
I2C Warning: .\src\i2c_vyb.c, 148: Start failed
RTC Time set (02.04.2019 18:31:04)
+OEMSetRealTime(2019/4/2 11:31:8.719)
+OEMSetAlarmTime(2019/11/3 2:0:0.000)
-OEMSetAlarmTime(rc = 1)

I tested a VF61 in the same eval board and the external RTC works properly.

Any suggestions?

2

I found this I2C -start failed message and clearing the registry seems to have solved the problem. I did have apps on this module that were build with older versions of the sdk. So I guess the real solution is to rebuild all my apps with the latest version of the sdk.