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FIRST_sample

README.md

Renesas RX microcontroller LED flashing sample

Japanese

Overview

Sample program of LED blinking using RX microcontroller

  • Master clock boost
  • Blinking LED
  • Delay due to software delay

Description

  • main.cpp
  • RX140/Makefile
  • RX220/Makefile
  • RX231/Makefile
  • RX62N/Makefile (BlueBoard-RX62N_100pin / FRK-RX62N)
  • RX631/Makefile (GR-CITRUS)
  • RX63T/Makefile
  • RX24T/Makefile
  • RX26T/Makefile
  • RX66T/Makefile
  • RX72T/Makefile
  • RX64M/Makefile
  • RX71M/Makefile
  • RX65N/Makefile (RX65N Envision Kit)
  • RX72N/Makefile (RX72N Envision Kit)

Hardware Preparation (General)

  • Refer to RXxxx/clock_profile.hpp for the crystal frequency of each microcontroller and each module.
  • Refer to RXxxx/board_profile.hpp for the LED connection port of each microcontroller.
  • Connect the indicator LEDs to the specified ports.
  • The LEDs are connected so that they light up at the LOW level output by default.
  • By changing the typedef of the LED, it can be made to turn on at the HIGH level.
  • For BlueBoard-RX62N_100pin, use the red LED (D2) on the board.
  • For FRK-RX62N, use LED1 on the board. (yellow)
  • For GR-CITRUS, use the red LED1 on the board. (red)
  • For RX65N Envision kit, use the blue LED on the board.
  • For RX72N Envision kit, use the blue LED on the board.

Boost the master clock

  • Boost the internal instruction clock (ICLK) to maximum speed once the operation is transferred to the main function.
  • Also set the clock for the internal device. (The setting is in RXxxx/clock_profile.hpp)
    SYSTEM_IO::boost_master_clock();

Set LED connection port to "output".

	using namespace board_profile;

	LED::OUTPUT(); // set LED port to output

Blink.

	while(1) {
		utils::delay::milli_second(250);
		LED::P = 1; // lights on
		utils::delay::milli_second(250);
		LED::P = 0; // lights off
	}

Limiting resistors for LEDs

  • Refer to the table below for the value of the limiting resistor to be placed in series with the LEDs.
  • The limiting resistor can be either on the Vcc side or on the Vss (GND) side.

When a current of about 1mA is applied:

Supply voltage Red(Vf) Yellow(Vf) Blue(Vf)
3.3V 2K (1.4V) 1.2K (2.1V) 300 (3.0V)
5V 3.6K (1.4V) 3K (2.1V) 2K (3.0V)

Calculation Formula: ("Supply voltage" - "Vf of LED") / "Current to LED"

  • The Vf of the LEDs in the table is only a guide and varies depending on the current flowing to the LEDs and the LEDs.
  • When Vf is large, the limiting resistor becomes smaller, so be sure that the current flowing through the port does not exceed the limit.
  • For the maximum current that can flow through the port, refer to "Electrical Characteristics" and "Allowable Output Current" in the hardware manual.

How to build

  • Move to each platform directory and make.
  • Write led_sample.mot file to the microcontroller.
  • FRK-RX62N is R5F562N7 (FlashRom: 374KB), so change the device in Makefile.
  • Enable the CQ_FRK variable (compile-time constant) to switch the board dependence.

Operation

  • The LED flashes every 0.25 seconds.

Remarks

  • This project is basic and includes minimum settings etc. Please refer to it when starting a new project.

Translated with www.DeepL.com/Translator (free version)

License

MIT