Hello Raspberry Pi

This video show how to watch CPU frequency of Raspberry Pi running Rspberry Pi OS (tested on Raspberry Pi 4):
- adding menu item of CPUFreq frontend
- or using vcgencmd.

vcgencmd is a command line utility that can get various pieces of information from the VideoCore GPU on the Raspberry Pi, details refer to Raspberry Pi Document of vcgencmd.

To get the actual speed of ARM cores, enter the command in Terminal:

$ vcgencmd measure_clock arm

You can also keep watching vcgencmd result in Terminal using the watch command.

$ watch -n 1 vcgencmd measure_clock arm

Alternatively, you can also check it in the file /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq, where cpu0 can be cpu0~4 for Raspberry Pi 4 with 4 core. Read HERE.

Steps to install Arduino IDE on Raspberry Pi 4/Raspberry Pi OS (32-bit), then add Seeed SAMD Boards; to program Seeed Wio Terminal on Raspberry Pi.

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Install Arduino IDE (Linux ARM 32 bits) on Raspberry Pi/Raspberry Pi OS


Download Arduino IDE for Linux ARM 32 bits
https://www.arduino.cc/en/Main/Software

Basically follow the official guide to Install the Arduino Software (IDE) on Linux, but install by running ./install.sh with sudo.

$ sudo ./install.sh

After installed, I tested to program Wio Terminal without problem. No extra steps is needed to set serial port permission.

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Install Seeed SAMD Boards to Arduino IDE, for Wio Terminal development


Open your Arduino IDE, click on File > Preferences,
and copy below url to Additional Boards Manager URLs:
https://files.seeedstudio.com/arduino/package_seeeduino_boards_index.json

Tools > Board > Board Manager,
Search Wio Terminal, install Seeed SAMD Boards.

reference: Get Started with Wio Terminal, more informative details and examples.

My first exercise for Wio terminal, simple detect button press and draw something on display:

#include <SPI.h>
#include <TFT_eSPI.h>
TFT_eSPI tft = TFT_eSPI();
int ptX = 50;
int ptY = 50;
/* Some basic pre-defined example colours(16-bit) including in the LCD library:
#define TFT_BLACK 0x0000 // 0, 0, 0
#define TFT_NAVY 0x000F // 0, 0, 128
#define TFT_DARKGREEN 0x03E0 // 0, 128, 0
#define TFT_DARKCYAN 0x03EF // 0, 128, 128
#define TFT_MAROON 0x7800 // 128, 0, 0
#define TFT_PURPLE 0x780F // 128, 0, 128
#define TFT_OLIVE 0x7BE0 // 128, 128, 0
#define TFT_LIGHTGREY 0xC618 // 192, 192, 192
#define TFT_DARKGREY 0x7BEF // 128, 128, 128
#define TFT_BLUE 0x001F // 0, 0, 255
#define TFT_GREEN 0x07E0 // 0, 255, 0
#define TFT_CYAN 0x07FF // 0, 255, 255
#define TFT_RED 0xF800 // 255, 0, 0
#define TFT_MAGENTA 0xF81F /* 255, 0, 255
#define TFT_YELLOW 0xFFE0 /* 255, 255, 0
#define TFT_WHITE 0xFFFF /* 255, 255, 255
#define TFT_ORANGE 0xFDA0 /* 255, 180, 0
#define TFT_GREENYELLOW 0xB7E0 /* 180, 255, 0
ref: https://wiki.seeedstudio.com/Wio-Terminal-LCD-Basic/
*/
/* basic graphical functions of the TFT LCD library on Wio Terminal.
 ref: https://wiki.seeedstudio.com/Wio-Terminal-LCD-Graphics/
drawPixel(int32_t x, int32_t y, uint32_t color);
drawLine(int32_t x0, int32_t y0, int32_t x1, int32_t y1, uint32_t color);
drawFastHLine(int32_t x, int32_t y, int32_t w, uint32_t color); //Horizontal line
drawFastVLine(int32_t x, int32_t y, int32_t h, uint32_t color); //Verical line
drawRect(int32_t x, int32_t y, int32_t w, int32_t h, uint32_t color);
fillRect(int32_t x, int32_t y, int32_t w, int32_t h, uint32_t color);
drawCircle(int32_t x0, int32_t y0, int32_t r, uint32_t color);
fillCircle(int32_t x0, int32_t y0, int32_t r, uint32_t color);
drawEllipse(int16_t x0, int16_t y0, int32_t rx, int32_t ry, uint16_t color);
fillEllipse(int16_t x0, int16_t y0, int32_t rx, int32_t ry, uint16_t color);
drawTriangle(int32_t x0, int32_t y0, int32_t x1, int32_t y1, int32_t x2, int32_t y2, uint32_t color);
fillTriangle(int32_t x0, int32_t y0, int32_t x1, int32_t y1, int32_t x2, int32_t y2, uint32_t color);
drawRoundRect(int32_t x, int32_t y, int32_t w, int32_t h, int32_t r, uint32_t color);
fillRoundRect(int32_t x, int32_t y, int32_t w, int32_t h, int32_t r, uint32_t color);
drawChar(int32_t x, int32_t y, uint16_t c, uint32_t color, uint32_t bg, uint8_t size)
drawString(const String& string, int32_t pptX, int32_t pptY);
fillScreen(uint32_t color);
*/
void updateLoc(String s){
 tft.drawPixel(ptX, ptY, TFT_WHITE);
 const String strLoc = s + " "+ (String)ptX + ":" + (String)ptY + " ";
 Serial.println(strLoc);
 tft.drawString(strLoc, 100, 100);
}
void setup() {
 Serial.begin(115200);
 pinMode(WIO_KEY_A, INPUT_PULLUP);
 pinMode(WIO_KEY_B, INPUT_PULLUP);
 pinMode(WIO_KEY_C, INPUT_PULLUP);
 pinMode(WIO_5S_UP, INPUT_PULLUP);
 pinMode(WIO_5S_DOWN, INPUT_PULLUP);
 pinMode(WIO_5S_LEFT, INPUT_PULLUP);
 pinMode(WIO_5S_RIGHT, INPUT_PULLUP);
 pinMode(WIO_5S_PRESS, INPUT_PULLUP);
 tft.init();
 tft.setRotation(2);
 tft.fillScreen(TFT_LIGHTGREY);
 tft.fillRect(1, 1, 238, 318, TFT_BLACK);
 tft.fillTriangle(1, 1, 1, 11, 11, 1, TFT_BLUE);
 tft.fillTriangle(238, 318, 238, 308, 228, 318, TFT_RED);
 updateLoc("x");
}
 
void loop() {
 // put your main code here, to run repeatedly:
 if (digitalRead(WIO_5S_UP) == LOW) {
 Serial.println("5 Way Up");
 ptX++;
 updateLoc("^");
 }
 else if (digitalRead(WIO_5S_DOWN) == LOW) {
 Serial.println("5 Way Down");
 ptX--;
 updateLoc("v");
 }
 else if (digitalRead(WIO_5S_LEFT) == LOW) {
 Serial.println("5 Way Left");
 ptY--;
 updateLoc("<");
 }
 else if (digitalRead(WIO_5S_RIGHT) == LOW) {
 Serial.println("5 Way Right");
 ptY++;
 updateLoc(">");
 }
 else if (digitalRead(WIO_5S_PRESS) == LOW) {
 Serial.println("5 Way Press");
 updateLoc("@");
 tft.fillCircle(ptX, ptY, 5, TFT_ORANGE);
 }
 if (digitalRead(WIO_KEY_A) == LOW) {
 Serial.println("A Key pressed");
 ptX+=10;
 updateLoc("A");
 tft.fillCircle(ptX, ptY, 10, TFT_RED);
 }
 else if (digitalRead(WIO_KEY_B) == LOW) {
 Serial.println("B Key pressed");
 updateLoc("B");
 tft.fillCircle(ptX, ptY, 10, TFT_GREEN);
 }
 else if (digitalRead(WIO_KEY_C) == LOW) {
 Serial.println("C Key pressed");
 ptX-=10;
 updateLoc("C");
 tft.fillCircle(ptX, ptY, 10, TFT_BLUE);
 }
 delay(200);
}

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to do...

~ This wiki introduce how to update the latest firmware for the Wireless Core Realtek RTL8720 on Wio Terminal, as well as installing all the dependent libraries for Wio Terminal to enable wireless connectivity.

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Related:

NEW Raspberry Pi OS update (May 2020)



visit: http://rpf.io/raspberrypios

Raspberry Pi Blog announced 8GB Raspberry Pi 4 on sale now at 75,ドル and also introduced the early beta 64-bit Raspberry Pi OS.

source:
~ Raspberry Pi Blog - 8GB Raspberry Pi 4 on sale now at 75ドル
~ You can find a link to the new 64-bit image, and some important caveats, in this forum post.

You can also read all about it in The MagPi magazine issue 94. Include download link for free PDF version.
~ https://magpi.raspberrypi.org/issues/94