Things to prepare

• Indispensable
  • RX72N Envision Kit × 1 unit
  • USB cable (USB Micro-B --- USB Type A) × 1
  • Windows PC × 1 unit
    • Tools to be installed in Windows PC
      • e2 studio 2020-10
      • CC-RX V3.02以降

Boot e2 studio to generate new project

• File -> New -> Project
  • Wizard -> C/C++ -> C/C++ Project -> Next
    • All -> Renesas CC-RX C/C++ Executable Projecta
      • Project name = Input rx72n_envision_kit -> Next
        • Toolchain Settings
          • RTOS -> FreeRTOS(Kernel Only)
          • If nothing is displayed in RTOS Version, obtain RTOS package form "Manage RTOS Versions..." link
        • Device Settings
          • Target Board -> EnvisionRX72N
            • When EnvisionRX72N can be selected：Target device is automatically selected.
            • When EnvisionRX72N can not be selected：Target device is not automatically selected
              • In this case, select Download Additional Boards to download EnvisionRX72N
              • Enable to install BDF during new project generation, too.
        • Configuration -> Generate Hardware Debug configuration -> E2 Lite (RX) -> Next
          • Check "use Smart Configurator" -> Exit

Perform setting with Smart Configurator

• Set clock

By using FreeRTOS task and generating 0.1 second cycle interrupt, turn on and off the LED in 0.1 second cycle.

Register task with Smart Configurator to generate code.

• • Press "component" tab on the lower part of Smart Configurator screen
  • Select FreeRTOS_Object -> Task
  • Enter led_task on Task Code and Task Name
  • Generate code

After 0.1 second waiting state, add code to turn on and off LED in LED task (led_task.c)

• Use a function called vTaskDelay() which creates waiting state.
  • An argument is waiting time of which resolution is TimeTick=1ms of FreeRTOS
  • By specifying 100, you can create 100ms or 0.1 second waiting state.

#include "task_function.h"
/* Start user code for import. Do not edit comment generated here */
#include "platform.h"
/* End user code. Do not edit comment generated here */

void led_task(void * pvParameters)
{
/* Start user code for function. Do not edit comment generated here */
	PORT4.PDR.BYTE = 1;	/* Originally should be set with Smart Configurator (★Require improvement) */
	while(1)
	{
		vTaskDelay(100);
		if(PORT4.PIDR.BIT.B0 == 1)
		{
			PORT4.PODR.BIT.B0 = 0;
		}
		else
		{
			PORT4.PODR.BIT.B0 = 1;
		}
	}
/* End user code. Do not edit comment generated here */
}
/* Start user code for other. Do not edit comment generated here */
/* End user code. Do not edit comment generated here */

Create waiting state to pass control to OS during infinite loop in main task (rx72n_envision_kit.c)

• Main task is registered with priority "3"
• LED task is registered with priority"1"
• The larger number has higher priority
• Since program counter is not passed to LED task in this state, LED control does not operate.
• Accordingly, creates waiting state to pass control to OS during infinite loop as shown below.

#include "FreeRTOS.h"
#include "task.h"

void main_task(void *pvParameters)
{

	/* Create all other application tasks here */

	while(1)
	{
		vTaskDelay(10);
	}

	vTaskDelete(NULL);

}

Reference

• What would happen when the priority is the same among multiple tasks?
  • FreeRTOS has a configuration to select the mechanism of scheduler.
  • Dfault is "Preemptive" valid.
  • In this case, in the case where a task with the same priority exists, when TimeTick=1ms of FreeRTOS passes or a task under execution ends, shifts to another task with the same priority.

Adjust heap capacity

• If increases resources such as task, necessary heap memory also increases.
• FreeRTOS can set heap memory
  • Firstly, check an estimated value of heap calculated by Smart Configurator.
    • Estimated at 5856byte(s) for Total For Heap Usage
  • Next, set the heap value of FreeRTOS with Smart Configurator
    • Enter a value with some room for an estimated value. In this example enter 8 (8KB setting value)
    • If executes with insufficient heap, infinite loop occurs with vApplicationMallocFailedHook()

Debugger setting

• Reference

Check operation

• Reference