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  1.   Abstract
  2.   Trademarks
  3. 1Introduction
  4. 2Installation of Edde Flex CAN Booster Pack for TI TIVA C
  5. 3Download and Import the CAN Host Examples
  6. 4Modified CAN.C for Interrupts
  7. 5Example Projects
    1. 5.1 Internal Loopback With Interrupts (simple_can_loopback)
    2. 5.2 Simple CAN Transmit (simple_can_tx)
    3. 5.3 Simple CAN Receive (simple_can_rx)
    4. 5.4 CAN UART Bridge (can_uart_bridge)
  8. 6CAN Bootloader
    1. 6.1 Bootloader Configuration
    2. 6.2 Boot Demo Program (boot_demo_can)
    3. 6.3 UART-to-CAN Bridge for LM Flash Programmer Support
      1. 6.3.1 CCS Demo Program (uart_to_can)
      2. 6.3.2 SendCANID PC Program
    4. 6.4 Using the CAN Bootloader

5.1 Internal Loopback With Interrupts (simple_can_loopback)

This example is the only one of these examples that can be run on the Launchpad without a CAN transceiver or a CAN network. When in loopback mode, the CAN module is allowed to receive the message it transmits if an additional mailbox is configured to receive that message. Also in loopback mode the module ignores the absence of an acknowledge bit. The CAN TX pin is active and can be viewed on an oscilloscope or logic analyzer. A CAN frame from this example is shown below with the missing acknowledge bit circled in red.

GUID-20200902-CA0I-TGWN-ZQT6-GSTGKC9QHGZC-low.pngFigure 5-1 Logic Analyzer Waveform

The message that is sent is a 4 byte message that contains an incrementing pattern. The value sent and the message received are echoed out the UART. In this example the CAN0 baud rate is 125000 and the UART0 baud rate is 115200.

This example uses the following interrupt handlers. To use this example in your own application you must add this interrupt handler to your vector table.

  • CANIntHandler - CAN 0 interrupt handler