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<section begin="History" />
{| style="border-collapse:collapse; "
!colspan="4" style="width:100%; text-align:left"; border-bottom:solid 2px #ededed"|History
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!style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white"|Version!style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white"|Issue Date!style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#73B2C7; padding:5px; color:white"|Notes
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|style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000"|X1.Y0.Z0|style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000"|Month YearMar 2021|style="border-left:solid 2px #73B2C7; border-right:solid 2px #73B2C7;border-top:solid 2px #73B2C7; border-bottom:solid 2px #73B2C7; background-color:#edf8fb; padding:5px; color:#000000"|TBDFirst release
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<section end="History" /><section begin="Body" /> ==Watchdog interface ==
=== Description ===
The Watchdog interface device available on the Evaluation Kit at the connector ''TBD:Jxxx''. ''Jxx'' is a ''TBD:connector-type'' header connector for provided by the RS232 two-wires UART3 port, used for debug purposes (bootloader and operating system serial console)Maxim MAX6373.
The Watchdog is a device that has to be constantly polled via GPIO to continue the normal operations, otherwise (in case of system freeze) it will reset the system.
The MAX6373 device has 3 configuration pins that allow to select the following:* the startup delay from 3ms to 60s or first edge of the WDI signal* the watchdog time (maximum time between WDI toggles) from 3ms to 10s or disable.As default the device is configured for start the operations on first edge of the WDI signal with a timeout of 10s. For custom configurations please send an e-mail to [[Filemailto:{{{nome-som}}-EVB-Watchdog-connectorhelpdesk@dave.eu helpdesk@dave.png|thumb|center|500px|Watchdog connector]eu]
===Signals ===
{| class="wikitable"
! latexfontsize="scriptsize"| Pin#! latexfontsize="scriptsize"| SOM Pin#! latexfontsize="scriptsize"| Pin name! latexfontsize="scriptsize"| Pin function! latexfontsize="scriptsize"| Pin Notes|-|1,2,4,6,,7,8,10| -| N.A.| N.C.| Not connected|-| 3| J1.189| RS232_RX| Receive line|
|-
| 3U6.1| J1J18.18728| RS232_TXWDI| Transmit lineWatchdog input
|
|-
| 9U6.7| -J18.24| DGNDWDO| GroundWatchdog output| system reset pin
|}
=== Device usage ===
To connect to use the debug serial port: # connect watchdog device toggle the DB9 adapter bracket to the J22 connector on the SBCX board# connect a serial cable between DB9 connector and PC COM port through a NULL-modem cable (not provided)# start your favorite terminal emulator software on PC (eg: PuTTY); communication parameters are: 115200,N,8,1<code>PA9</code> GPIO at least once every 5 seconds.
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[[Category:ETRA]]