SPRUJ53B April 2024 – September 2024 TMS320F28P550SJ , TMS320F28P559SJ-Q1
The ping frame watchdog is a hardware-enabled automatic error detection of the connection status to the transmitter. This watchdog monitors the time elapsed between ping frames. If the transmitter has been set up to periodically send out a ping frame, the receiver can be set up to monitor whether this frame has been received within a specified amount of time. If the time between ping frames has exceeded the programmed number of clock cycles, an event is triggered that can generate an interrupt or be monitored by software.
This watchdog has a dedicated counter that is reset and restarted upon the successful reception of a ping frame. The watchdog counter is incremented at the rate of SYSCLK. Optionally, the watchdog can be configured to be reset upon the successful reception of any frame. This option allows the receiver to monitor for any successful frame to indicate that the connection is still alive and the transmitter is still functioning as expected.
To configure the ping frame watchdog for operation:
The ping watchdog is now enabled and can now monitor for ping frames.
If the RX_PING_WD_CNT value reaches the value programmed in RX_PING_WD_REF, the RX_EVT_STS.PING_WD_TO flag is set. If configured, an interrupt can be generated on this event.