Beetle RP2350 Example Code for Arduino-SPI Communication

This article explores Arduino-SPI communication, detailing hardware and software setups with DFRobot components. It includes a sample code that demonstrates the integration of a TFT display, providing a practical guide for enthusiasts to effectively utilize SPI interfaces in their projects.

Hardware Preparation

Software Preparation

Click to download DFRobot_GDL library file

Wiring Diagram

Mainboard	Pin name	screen	Pin name
Beetle RP2350	GND	TFT display	GND
Beetle RP2350	3V3	TFT display	VCC
Beetle RP2350	4	TFT display	DC
Beetle RP2350	5	TFT display	CS
Beetle RP2350	8	TFT display	RST
Beetle RP2350	16	TFT display	MISO
Beetle RP2350	18	TFT display	SCK
Beetle RP2350	19	TFT display	MOSI

Sample Code

#define PIN_SPI0_MISO  (16u)
#define PIN_SPI0_MOSI  (19u)
#define PIN_SPI0_SCK   (18u)
Code:
#include "DFRobot_GDL.h"

#define TFT_DC  4
#define TFT_CS  5
#define TFT_RST 8

DFRobot_ST7789_240x320_HW_SPI screen(/*dc=*/TFT_DC,/*cs=*/TFT_CS,/*rst=*/TFT_RST);

void setup() {
  screen.begin();
  screen.setTextSize(1);
  screen.fillScreen(COLOR_RGB565_BLACK);
  screen.setFont(&FreeMono12pt7b);
  screen.setCursor(/*x=*/32,/*y=*/64);
  screen.setTextColor(COLOR_RGB565_LGRAY);
     screen.setTextWrap(true);
  screen.print("DFRobot");
}

void loop() {

}

Result

The screen displays the character "DFRobot".

Additional Information

The SPI interface, full name Serial Peripheral Interface, is a simple, two-way serial interface developed by Motorola. It can enable the microcontroller to communicate with various peripheral devices in a serial manner to exchange information. Peripheral devices include Flash, RAM, LCD displays, A/D converters, and MCUs, etc.

The SPI communication interface pin distribution of Beetle RP2350 is as follows:

Pin Number	SPI Function
16	SPI0/MISO
18	SPI0/SCK
19	SPI0/MOSI