2 Frame Generation – GPIO/CCS Method

This section explains how to configure error generation using the GPIO/CCS method. This should be used in conjunction with Figure 2-1.

• Configure message length and bit-rate
  • Configure message length in bytes (DLC)
  • Configure bit-rate (in bps)

Hardware set up procedure:

CAN_GPIO_MODE

1. Select the GPIO that would generate the CAN bit stream.
2. Connect a jumper wire from the chosen GPIO to the selected CANRX pin.
3. Connection is direct between GPIO and CANRX pins. No transceiver involved.

CAN_DATALBCK_MODE

1. No external connections are needed.
2. CANTX data directly goes to the CANRX buffer using internal connection.

• Configure CAN Data Frame
  • Enter desired Arbitration ID (Message ID)
  • Enter desired data to be transmitted
  • Choose data frame or remote request

CCS-Use Watch Expression to monitor CAN-frame related variables

• Generated 15-bit CAN CRC using polynomial 0xC599 can be monitored through the Expressions window in CCS.
• The number of occurrences for stuffed bits can also be monitored in the Expressions window of CCS.