Overview
The Watchdog system can perform various actions if the T-Series device does not receive any communication within a specified timeout period. Actions include:
- Reset/restart the device
- Set DIO
- Set DAC0/DAC1
- Reset IO configs
Example: Reset after no communication for 60 seconds
The most common way to use Watchdog is to write:
WATCHDOG_ENABLE_DEFAULT=0 // Disable the Watchdog
WATCHDOG_TIMEOUT_S_DEFAULT=60 // Set the timeout in seconds
WATCHDOG_RESET_ENABLE_DEFAULT=1 // Enable reset upon timeout
WATCHDOG_ENABLE_DEFAULT=1 // Enable the Watchdog
With this configuration, the Watchdog will cause the device to reset if it does not receive any communication for 60 seconds. In other words, if nothing is talking to the device, it will reset every 60 seconds.
Use the IO Config system to configure the power-up defaults as desired.
Basic Usage
A typical usage is to use the IO Config system to set the power-up defaults as desired, then configure the Watchdog to reset the device on timeout.
Write 0 to WATCHDOG_ENABLE_DEFAULT to disable the Watchdog while setting Watchdog configurations. Write 1 to it to enable the Watchdog:
| Name |
Start Address |
Type |
Access |
|
WATCHDOG_ENABLE_DEFAULT
Write a 1 to enable the watchdog or a 0 to disable. The watchdog must be disabled before writing any of the other watchdog registers (except for WATCHDOG_STRICT_CLEAR).
|
61600 |
UINT32 |
R/W
|
WATCHDOG_ENABLE_DEFAULT
- Address: 61600
Write a 1 to enable the watchdog or a 0 to disable. The watchdog must be disabled before writing any of the other watchdog registers (except for WATCHDOG_STRICT_CLEAR).
- Data type: UINT32 (type index = 1)
-
Readable and writable
- Default value: 0
-
T7:
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Use WATCHDOG_TIMEOUT_S_DEFAULT to set the timeout in seconds:
| Name |
Start Address |
Type |
Access |
|
WATCHDOG_TIMEOUT_S_DEFAULT
When the device receives any communication over USB/Ethernet/WiFi, the watchdog timer is cleared. If the watchdog timer is not cleared within the timeout period, the enabled actions will be done.
|
61604 |
UINT32 |
R/W
|
WATCHDOG_TIMEOUT_S_DEFAULT
- Address: 61604
When the device receives any communication over USB/Ethernet/WiFi, the watchdog timer is cleared. If the watchdog timer is not cleared within the timeout period, the enabled actions will be done.
- Data type: UINT32 (type index = 1)
-
Readable and writable
- Default value: 0
-
T7:
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The timeout period is reset when a response to a command-response packet is sent to the host, except when strict mode is enabled (see below).
In addition to enabling the Watchdog and setting a timeout, the Watchdog needs to be configured to take an action when the timeout is complete.
Actions
Most applications will simply need the Watchdog to reset the device. Use WATCHDOG_RESET_ENABLE_DEFAULT to enable device reset:
| Name |
Start Address |
Type |
Access |
|
WATCHDOG_RESET_ENABLE_DEFAULT
Timeout action: Set to 1 to enable device-reset on watchdog timeout.
|
61620 |
UINT32 |
R/W
|
WATCHDOG_RESET_ENABLE_DEFAULT
- Address: 61620
Timeout action: Set to 1 to enable device-reset on watchdog timeout.
- Data type: UINT32 (type index = 1)
-
Readable and writable
- Default value: 0
-
T7:
|
To set DIO upon timeout, set the following configurations:
| Name |
Start Address |
Type |
Access |
|
WATCHDOG_DIO_ENABLE_DEFAULT
Timeout action: Set to 1 to enable DIO update on watchdog timeout.
|
61630 |
UINT32 |
R/W
|
WATCHDOG_DIO_ENABLE_DEFAULT
- Address: 61630
Timeout action: Set to 1 to enable DIO update on watchdog timeout.
- Data type: UINT32 (type index = 1)
-
Readable and writable
- Default value: 0
-
T7:
|
|
WATCHDOG_DIO_STATE_DEFAULT
The state high/low of the digital I/O after a Watchdog timeout. See DIO_STATE
|
61632 |
UINT32 |
R/W
|
WATCHDOG_DIO_STATE_DEFAULT
- Address: 61632
The state high/low of the digital I/O after a Watchdog timeout. See DIO_STATE
- Data type: UINT32 (type index = 1)
-
Readable and writable
- Default value: 0
-
T7:
|
|
WATCHDOG_DIO_DIRECTION_DEFAULT
The direction input/output of the digital I/O after a Watchdog timeout. See DIO_DIRECTION
|
61634 |
UINT32 |
R/W
|
WATCHDOG_DIO_DIRECTION_DEFAULT
- Address: 61634
The direction input/output of the digital I/O after a Watchdog timeout. See DIO_DIRECTION
- Data type: UINT32 (type index = 1)
-
Readable and writable
-
T7:
|
|
WATCHDOG_DIO_INHIBIT_DEFAULT
This register can be used to prevent the watchdog from changing specific IO. See DIO_INHIBIT for more information.
|
61636 |
UINT32 |
R/W
|
WATCHDOG_DIO_INHIBIT_DEFAULT
- Address: 61636
This register can be used to prevent the watchdog from changing specific IO. See DIO_INHIBIT for more information.
- Data type: UINT32 (type index = 1)
-
Readable and writable
- Default value: 0
-
T7:
|
To set DAC0 or DAC1 upon timeout, set the following configurations:
| Name |
Start Address |
Type |
Access |
|
WATCHDOG_DAC0_ENABLE_DEFAULT
Timeout action: Set to 1 to enable DAC0 update on watchdog timeout.
|
61640 |
UINT32 |
R/W
|
WATCHDOG_DAC0_ENABLE_DEFAULT
- Address: 61640
Timeout action: Set to 1 to enable DAC0 update on watchdog timeout.
- Data type: UINT32 (type index = 1)
-
Readable and writable
- Default value: 0
-
T7:
|
|
WATCHDOG_DAC0_DEFAULT
The voltage of DAC0 after a Watchdog timeout.
|
61642 |
FLOAT32 |
R/W
|
WATCHDOG_DAC0_DEFAULT
- Address: 61642
The voltage of DAC0 after a Watchdog timeout.
- Data type: FLOAT32 (type index = 3)
-
Readable and writable
- Default value: 0
-
T7:
|
|
WATCHDOG_DAC1_ENABLE_DEFAULT
Timeout action: Set to 1 to enable DAC1 update on watchdog timeout.
|
61650 |
UINT32 |
R/W
|
WATCHDOG_DAC1_ENABLE_DEFAULT
- Address: 61650
Timeout action: Set to 1 to enable DAC1 update on watchdog timeout.
- Data type: UINT32 (type index = 1)
-
Readable and writable
- Default value: 0
-
T7:
|
|
WATCHDOG_DAC1_DEFAULT
The voltage of DAC1 after a Watchdog timeout.
|
61652 |
FLOAT32 |
R/W
|
WATCHDOG_DAC1_DEFAULT
- Address: 61652
The voltage of DAC1 after a Watchdog timeout.
- Data type: FLOAT32 (type index = 3)
-
Readable and writable
- Default value: 0
-
T7:
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To reset IO configs, set the following advanced configuration:
| Name |
Start Address |
Type |
Access |
|
WATCHDOG_ADVANCED_DEFAULT
A single binary-encoded value where each bit is an advanced option. If bit 0 is set, IO_CONFIG_SET_CURRENT_TO_FACTORY will be done on timeout. If bit 1 is set, IO_CONFIG_SET_CURRENT_TO_DEFAULT will be done on timeout.
|
61602 |
UINT32 |
R/W
|
WATCHDOG_ADVANCED_DEFAULT
- Address: 61602
A single binary-encoded value where each bit is an advanced option. If bit 0 is set, IO_CONFIG_SET_CURRENT_TO_FACTORY will be done on timeout. If bit 1 is set, IO_CONFIG_SET_CURRENT_TO_DEFAULT will be done on timeout.
- Data type: UINT32 (type index = 1)
-
Readable and writable
- Default value: 0
-
T7:
|
Short Timeouts
The Watchdog timeout can be set as low as 1 second—but such a low value can prevent the device from communicating if reset is enabled. For example, when a USB device resets it takes a little time for USB to re-enumerate and software to be able to talk to the device again, so you could get in a situation where the device keeps resetting so often that you can't start talking to it again. This might require using the reset-to-factory jumper—see 11.0 SPC for details.
Strict Mode
The default timeout period is reset when a response to a command-response packet is sent to the host. Alternatively, "strict" mode can be enabled using WATCHDOG_STRICT_ENABLE_DEFAULT:
| Name |
Start Address |
Type |
Access |
|
WATCHDOG_STRICT_ENABLE_DEFAULT
Set to 1 to enable strict mode.
|
61610 |
UINT32 |
R/W
|
WATCHDOG_STRICT_ENABLE_DEFAULT
- Address: 61610
Set to 1 to enable strict mode.
- Data type: UINT32 (type index = 1)
-
Readable and writable
- Default value: 0
-
T7:
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When strict mode is enabled, the timeout period is reset by writing the key value to WATCHDOG_STRICT_CLEAR:
| Name |
Start Address |
Type |
Access |
|
WATCHDOG_STRICT_CLEAR
When running in strict mode, writing the key to this register is the only way to clear the watchdog. Writing to this register while not using strict mode will clear the watchdog.
|
61614 |
UINT32 |
W
|
WATCHDOG_STRICT_CLEAR
- Address: 61614
When running in strict mode, writing the key to this register is the only way to clear the watchdog. Writing to this register while not using strict mode will clear the watchdog.
- Data type: UINT32 (type index = 1)
-
Write-only
- Default value: 0
-
T7:
|
To set the key, write to WATCHDOG_STRICT_KEY_DEFAULT:
| Name |
Start Address |
Type |
Access |
|
WATCHDOG_STRICT_KEY_DEFAULT
When set to strict mode, this is the value that must be written to the clear register.
|
61612 |
UINT32 |
R/W
|
WATCHDOG_STRICT_KEY_DEFAULT
- Address: 61612
When set to strict mode, this is the value that must be written to the clear register.
- Data type: UINT32 (type index = 1)
-
Readable and writable
- Default value: 0
-
T7:
|
When strict mode is disabled, writing any value to WATCHDOG_STRICT_CLEAR will clear the Watchdog.
Writing to WATCHDOG_STRICT_CLEAR will clear the Watchdog when the write is processed, not when a response packet is sent.
When Using Stream
Normal spontaneous stream data does not reset the Watchdog timeout. Write periodic command-response communication to reset the Watchdog timeout. For the difference between command-response and stream, see the Communication section.
Startup Delay
To set an initial delay, use WATCHDOG_STARTUP_DELAY_S_DEFAULT:
| Name |
Start Address |
Type |
Access |
|
WATCHDOG_STARTUP_DELAY_S_DEFAULT
This specifies the initial timeout period at device bootup. This is used until the first time the watchdog is cleared or timeout ... after that the normal timeout is used.
|
61606 |
UINT32 |
R/W
|
WATCHDOG_STARTUP_DELAY_S_DEFAULT
- Address: 61606
This specifies the initial timeout period at device bootup. This is used until the first time the watchdog is cleared or timeout ... after that the normal timeout is used.
- Data type: UINT32 (type index = 1)
-
Readable and writable
- Default value: 0
-
T7:
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