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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

4.4.2 i2c_tmp117_demo

This example shows how to configure the I2C module to read a TMP117 High Accuracy Temperature Sensor. The I2C 2 module is configured to run at 100 kHz and read data from the TMP117 every second before calculating the temperature and displaying it over UART.

To read and convert the data from the TMP117 sensor, ASC-STUDIO was used to generate the source code which handles all register reads, writes, and delays. TivaWare I2C APIs were inserted into the mcu_i2cTransfer function to handle all communications with the sensor. From there simple read and data conversion APIs can be used to read / display the temperature.

In this example, only one task is created which takes a temperature reading every millisecond. The sensor data is received as a raw value that needs to be converted, so three different conversion functions are demonstrated to translate and output the result over UART as both an integer and a decimal down to a millidegree Celsius.