ESTE: UART - Interrupts and Circular Buffer

This experiment is part of this project.

To complete this experiment it is recommended to see at first the UART - Basic Interrupts script.

Pseudo code

Let's begin with a solution. The pseudo code (actual coding is up to you) is below:

int main(void) {
    byte incomingByte;
    baud_rate = 9600;
    while(1) {
        led_off();
    }
    return 0;    
}
void serial_interrupt_event() {
    if (data_available_on_input_field()) {
        incomingByte = read_data_on_input_field();
        println(incomingByte);
        led_on();
    }
}

This pseudo-code has a comparison statement to check if there are data available on the input field of the serial monitor, i.e serial port. If so, the data available will be stored on the memory, printed - only for debuging- and the led will be lighted on.

Schematic

Fig. 1 Schematic of the circuit

Part List

• 1 LED
• 1 220 ohm resistor for the led
• 1 Protoboard
• 2 copper wires (tinned) or jumpers

Assembly

Fig. 2 Assembly of the circuit

Solutions

• C - AVR
• Arduino UNO

Tools

• Cutecom
• Arduino IDE

References

• Atmel: Using the AVR UART in C
• [1]
• LEAP: An Interrupt Driven Circular Buffer for Serial Communication
• Simply Embedded: UART Receive Buffering
• Downtown Doug Brown: Microcontrollers: Interrupt-safe ring buffers
• AVR Freaks: Interrupt Driven UART Receive Ring (FIFO) Buffer
• Google Code: Arduino buffered serial