Digispark Attiny85 example sketches

echo.ino

#include <DigiCDC.h>

void setup() {
	SerialUSB.begin();
}

void loop() {
	if (SerialUSB.available()) {
		SerialUSB.write(SerialUSB.read());
	}
	SerialUSB.refresh();
}

echo_broken.ino

#include <DigiCDC.h>

// #define BRICK
#define LED_PIN 1 // 0: Model B, 1: Model A
#define BRICK_AT 4
#define BUFFER_SIZE 512 // 128 works global, 8192 works local
size_t CHAR_COUNT = 0;
#ifdef BRICK
char BUFFER[BUFFER_SIZE];
#endif

void setup() {
	SerialUSB.begin();
	pinMode(LED_PIN, OUTPUT);
	digitalWrite(LED_PIN, LOW);
}

void loop() {
#ifndef BRICK
	char BUFFER[BUFFER_SIZE];
#endif
	if (SerialUSB.available()) {
		int c = SerialUSB.read();
		SerialUSB.write(c);
		CHAR_COUNT += 1;
		if (CHAR_COUNT > BRICK_AT) {
			digitalWrite(LED_PIN, HIGH);
			SerialUSB.println("Brick");
			SerialUSB.delay(2000);
			SerialUSB.println("Wait done");
			for (size_t t = 0; t < BUFFER_SIZE; t++) {
				BUFFER[t] = c;
			}
			digitalWrite(LED_PIN, LOW);
		}
	}
	SerialUSB.refresh();
}

osccal.ino

#include <DigiCDC.h>

void setup() {
	OSCCAL = 154;
	SerialUSB.begin();
}

void loop() {
	if (SerialUSB.available()) {
		int x = SerialUSB.read();
		if (x == '0') {
			SerialUSB.println("OSCCAL: ");
			SerialUSB.println(OSCCAL + 0);
		} else if (x == '+') {
			OSCCAL += 1;
		} else if (x == '-') {
			OSCCAL -= 1;
		} else {
			SerialUSB.write(x);
		}
	}
}

osccal_output.txt

$ arduino-cli monitor -p /dev/ttyACM0
Connected to /dev/ttyACM0! Press CTRL-C to exit.
0
OSCCAL:
157

123456789abcdefghijklmnopqrstuvwxyz987654321g
123456789abcdefghijklmnopqrstuvwxyz94

123456789abcdefghijklmnopqrstuvwxyz987654321
123456789abcdefghijklmnopqrstuvwxyz94

++

0
OSCCAL:
159

123456789abcdefghijklmnopqrstuvwxyz987654321
123456789abcdefghijklmnopqrstuvwxyz94

123456789abcdefghijklmnopqrstuvwxyz987654321
123456789abcdefghijklmnopqrstuvwxyz94

++

123456789abcdefghijklmnopqrstuvwxyz987654321
12345q9abcdgghihijklopqrstuvoxyz191919

123456789abcdefghijklmnopqrstuvwxyz987654321
1234512345.q9abcdgghijklmhijklmhijh111911

--

--

--

0
OSCCAL:
155

123456789abcdefghijklmnopqrstuvwxyz987654321
123456789abcdefghijklmnopqrstuvwxyz94

123456789abcdefghijklmnopqrstuvwxyz987654321
123456789abcdefghijklmnopqrstuvwxyz94

-

0
OSCCAL:
154

123456789abcdefghijklmnopqrstuvwxyz987654321
12345123456789abcdefghijklmnopqrstuvpx4

123456789abcdefghijklmnopqrstuvwxyz987654321
123456789abcdefghijklmnopqrstuvwxyz94

123456789abcdefghijklmnopqrstuvwxyz987654321
123456789abcdefghijklmnopqrstuvwxyz94

0
OSCCAL:
154

-

123456789abcdefghijklmnopqrstuvwxyz987654321
12345

123456789abcdefghijklmnopqrstuvwxyz987654321


0
OSCCAL:
153

123456789abcdefghijklmnopqrstuvwxyz987654321

serial.ino

#include <DigiCDC.h>

#define LED_PIN 1 // 0: Model B, 1: Model A
#define BUFFER_SIZE 128

struct readline_buffer {
	char str[BUFFER_SIZE];
	size_t _position;
};
struct readline_buffer buffer;

void readline_buffer_init(struct readline_buffer *buf) {
	buf->str[0] = '\0';
	buf->_position = 0;
}

size_t serial_readline(struct readline_buffer *buf) {
	while (true) {
		if (!SerialUSB.available()) {
			SerialUSB.println("");
			return 0;
		}
		bool full = (buf->_position == BUFFER_SIZE - 2);
		if (full) {
			break;
		}
		int recv = SerialUSB.read();
		if (recv < 0 || recv >= 127) {
			continue;
		}
		if (recv == '\n' || recv == '\0') {
			break;
		} else {
			buf->str[buf->_position] = (char)recv;
			buf->_position += 1;
			continue;
		}
	}
	buf->str[buf->_position] = '\0';
	return buf->_position;
}

void setup() {
	readline_buffer_init(&buffer);
	pinMode(LED_PIN, OUTPUT);
	digitalWrite(LED_PIN, LOW);
	SerialUSB.begin();
}

void loop() {
	if (!SerialUSB.available()) {
		return;
	}
	size_t result = serial_readline(&buffer);
	if (result != 0) {
		SerialUSB.print("Recv: ");
		SerialUSB.println(buffer.str);
		if (0 == strcmp(buffer.str, "activate orange led")) {
			digitalWrite(LED_PIN, HIGH);
		}
		if (0 == strcmp(buffer.str, "deactivate orange led")) {
			digitalWrite(LED_PIN, LOW);
		}
		readline_buffer_init(&buffer);
	}
}