WEEK6 Embedded programming

WEEK6 Embedded programming

Group Assignment

compare the performance and development workflows for other architectures
Group assignment Page

Individual Assignment

write a program for a microcontroller development board to interact (with local input &/or output devices) and communicate (with remote wired or wireless devices)

About Seeed Studio XIAO RP2040

The Seeed Studio XIAO RP2040 offers a powerful performance and a variety of functions despite its compact size. It's ideal for wearable devices, prototyping, and small projects, featuring a USB Type-C connection, multiple communication interfaces, and programmable GPIO pins, catering to a wide range of development needs.

Setup

For this assignment, we will be using the Quentorres board that was made in Week 4.

The setup for programming the XR2040 board with the Arduino IDE was completed in Week 4.
The simple setup steps are as follows.

1. Download and install the Arduino IDE from the official Arduino website.
2. Open the Arduino IDE and go to File > Preferences.
3. Enter the URL for the XR2040 board's package in the "Additional Board Manager URLs" field.
4. Open Tools > Board > Boards Manager, search for the XR2040 board package, and install it.
5. Select the XR2040 board from Tools > Board.
6. Choose the correct port under Tools > Port.

Assignment 1

Turns an LED on by pressing the button.

I downloaded the code from here and changed the buttonPin and ledPin numbers.

const int buttonPin = 27;  //Originally D0
const int ledPin = 26;     //Originally 25

int buttonState = 0;

// the setup function runs once when you press reset or power the board
void setup() {
  // initialize digital pin LED_BUILTIN as an output.
  pinMode(ledPin, OUTPUT);
  pinMode(buttonPin, INPUT);
}

// the loop function runs over and over again forever
void loop() {

  buttonState = digitalRead(buttonPin);

  if (buttonState == HIGH) {
    digitalWrite(ledPin, HIGH);  // turn the LED on (HIGH is the voltage level)
  } else {
    digitalWrite(ledPin, LOW);
  }
}

Assignment 2-1

Using an internal temperature sensor

The Arduino IDE contains many example codes. You can find the code under 'File > Examples > rp2040 > Temperature.ino'.I added code to display the elapsed time.

unsigned long startTime;

void setup() {
  Serial.begin(115200);
  startTime = millis();
  delay(5000);
}

void loop() {
  unsigned long currentTime = millis();
  unsigned long elapsedTime = currentTime - startTime; 
  Serial.printf("Elapsed time: %lu ms  ", elapsedTime);
  Serial.printf("Core temperature: %2.1fC\n", analogReadTemp());
  delay(1000);
}

Assignment 2-2

Setting and printing the current time

You can find the code under 'File > Examples > rp2040 > Time.ino'. I have added code to adjust to EST.

#include <time.h>
#include <sys/time.h>

void setup() {
  Serial.begin(115200);
  delay(5000);
  struct timeval tv;

  tv.tv_sec = 1709524870 + (9 * 3600);  // Adjusting for a 9-hour time difference
  tv.tv_usec = 0;
  settimeofday(&tv, nullptr);
}

void loop() {
  time_t now;
  char buff[80];

  time(&now);
  strftime(buff, sizeof(buff), "%c", localtime(&now));
  Serial.println(buff);
  delay(1000);
}