UM0239 datasheet(30/44 Pages) STMICROELECTRONICS

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Ping sessions

UM0239

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7.1.2

Starting a Master Ping session

Click Ping Start to start the ping session. The MCU on

EVALCOMMBOARD continuously

transmits the current status of every message transmitted to the PC.

Click Ping Stop to end the ping session.

Click Close to close the Ping Master dialog box.

Medium access control settings

Medium access

control

Defines which type of medium access is used. Choices are “none”, “BU” or

“PD”. In the two last settings, packets are sent only if respectively BU or CD/PD

lines are not active. If “PD” is selected while “Carrier Detection” CR control is

used, content of Control Register is changed in order to select the detection

method to “Preamble detection”.

Max wait slot nr.

If BU or CD/PD lines are actives (depending on Medium Access Control

selected), the Master waits for a time selected randomly between 4ms and

4*Max Wait Slot Nr. ms before to analyze if it is possible to transmit a packet.

Max wait time

Defines the maximum time to wait when “BU” or “PD” Medium Access control

are selected before to transmit the packet. When the Max Wait Time is

elapsed, the packet is transmitted even if BU or CD/PD lines are actives.

Current message settings

Current message

status

Shows information about the acknowledgement of the current message sent.

Last Addressed Slave represents which Slave is the recipient of message.

LEDs show if a message is acknowledged properly (OK), not correctly

acknowledged (No Ack.), if the acknowledged message has errors corrected

by FEC (Master used FEC) or if the acknowledged message has errors not

corrected by FEC (Wrong FCS).

Statistical data display

Statistical data for

Slave

These data are available for each Slave. Enter the name of the Slave device in

Slave Description textbox.

– % OK messages: the total number of messages properly received plus those

corrected through FEC

– Corrected messages: the number of messages corrected through FEC

– KO messages: the total number of messages with wrong FCS plus the

number of message not acknowledged

– Wrong FCS messages: the number of messages with wrong FCS even after

correction

– Not ACK messages: the number of messages not acknowledged

Click Save Statistics to store collected data in a text file.

Minimum Wait time values are: @600 bps

→300 ms, @1200 bps→150 ms, @2400 bps→75 ms, @4800

bps

→40 ms.

Table 24.

Ping master parameters (continued)

Parameter

Description

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