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  1.   Abstract
  2.   Trademarks
  3. 1Introduction
  4. 2How to Install
    1. 2.1 Update the FreeRTOS Version in the TivaWare Directory
    2. 2.2 Adding FreeRTOS Hardware Driver Files for TM4C LaunchPads
  5. 3Architecture for TM4C FreeRTOS Examples
    1. 3.1 Proper Clock Configuration
    2. 3.2 How to use Hardware Interrupts Alongside the FreeRTOS Kernel
  6. 4Example Project Walkthroughs
    1. 4.1 Download and Import the Examples
    2. 4.2 CAN Examples
      1. 4.2.1 multi_can_rx
      2. 4.2.2 multi_can_tx
    3. 4.3 Hardware Timer Examples
      1. 4.3.1 timer_edge_capture
      2. 4.3.2 timer_edge_count
    4. 4.4 I2C Examples
      1. 4.4.1 i2c_simple_loopback
      2. 4.4.2 i2c_tmp117_demo
    5. 4.5 PWM Examples
      1. 4.5.1 pwm_interrupt
      2. 4.5.2 pwm_invert
    6. 4.6 SSI Examples
      1. 4.6.1 ssi_simple_xfer
      2. 4.6.2 ssi_quad_mode
    7. 4.7 μDMA Examples
      1. 4.7.1 adc_udma_pingpong
      2. 4.7.2 udma_mem_transfer

4.4.1 i2c_simple_loopback

This example shows how to configure the I2C 0 module to send and receive data on the I2C bus. It uses loopback mode, which allows for the omission of any pull-up resistors on the I2C lines by instead using the internal bus to transfer the data.

In this example, two tasks are created. The transmit task sends data to the I2C shift register every 10 milliseconds. After the data is written, the transmit task sends a notification to the receive task. When the data is sent, a notification is asserted to the receiver task which reads the data on the I2C receiver and display it on the terminal window.