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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 Kernel Examples
      1. 4.2.1 Example: hello
      2. 4.2.2 Example: notify_example
      3. 4.2.3 Example: queue_example
      4. 4.2.4 Example: semaphore_example
      5. 4.2.5 Example: blinky_queue
      6. 4.2.6 Software Timer Examples
        1. 4.2.6.1 Example: timer_sw_oneshot
        2. 4.2.6.2 Example: timer_sw_periodic
        3. 4.2.6.3 Example: timer_sw_led_counter/timer_sw_rgb
    3. 4.3 ADC Examples
      1. 4.3.1 Example: adc_multi_channel
      2. 4.3.2 Example: adc_timer_trigger
    4. 4.4 Hardware Timer Examples
      1. 4.4.1 Example: timer_hw_oneshot
      2. 4.4.2 Example: timer_hw_periodic
      3. 4.4.3 Example: timer_hw_pwm
    5. 4.5 UART Example
      1. 4.5.1 Example: uart_thread_safe
    6. 4.6 Watchdog Example
      1. 4.6.1 Example: watchdog

3 Architecture for TM4C FreeRTOS Examples

The provided example projects are designed with the purpose of offering a compact and streamlined foundation that can be used to begin application development. In order to achieve this, the FreeRTOS kernel is used in conjunction with the TivaWare Driver Library (DriverLib) without any additional abstraction layers added. The configuration and handling of specific peripherals are contained within dedicated task files, which allow for easy re-use across multiple projects.

At this time, POSIX is not included as part of the architecture. The FreeRTOS + POSIX solution currently is a partial implementation that is only offered via GitHub. Details about that offering can be read about at this link.

In addition to DriverLib, TivaWare also includes some utilities to complement specific applications such as outputting UART messages over a terminal or using external memory sources. Be aware that these utilities were created for bare metal applications and may include APIs that were not designed to be thread safe. For the simplicity of demonstrations, there are times certain non-thread safe APIs are used in example projects. These are clearly highlighted as non-thread safe, and they are only used to demonstrate what is being executed as part of the example project. For UART communication, a thread safe UART example is provided which can be used for any application that requires utilizing UART console messaging for either debug purposes or the final product.