My program objective is to count the number of "1", if total is even, the LED will turn on and vice versa. I will send a txt file, containing these bits, each line has 8 bits of "0" and "1" to the Arduino board using a software call Terminal.exe:
This is my code so far (not complete):
#ifndef F_CPU
#define F_CPU 16000000UL // Set 16 MHz clock speed
#endif
#include <avr/io.h>
#define USART_BAUDRATE 9600
#define BAUD_PRESCALE (((( F_CPU / 16) + ( USART_BAUDRATE / 2)) / ( USART_BAUDRATE )) - 1)
#include <avr/interrupt.h>
int main ( void )
{
//Setup the Baud Rate
UBRR0H = ( BAUD_PRESCALE >> 8); // Load upper 8- bits of the baud rate value into the high byte of the UBRR0H register
UBRR0L = BAUD_PRESCALE ; // Load lower 8- bits of the baud rate value into the low byte of the UBRR0L register
//Configure data format for transimission
UCSR0C = (1 << UCSZ00 ) | (1 << UCSZ01 ); // Use 8- bit character sizes
UCSR0B = (1 << RXEN0 ) | (1 << TXEN0 ); // Turn on the transmission and recep-tion circuitry
UCSR0B |= (1 << RXCIE0);
DDRB = 0xFF;
sei();
char ReceivedByte ; //Variable to store the data (1 byte) read from the register
while(1)
{
while (( UCSR0A & (1 << RXC0 )) == 0) {}; // Wait till data received and ready to be read from UDR0
ReceivedByte = UDR0 ; // Read the received byte value
if ((UDR0 %2) == 0){
PORTB |= (1 << PORTB5); // Turn on LED
sei();
}
else if ((UDR0 %2) == 1) {
PORTB &= ~ (1 << PORTB5); // Turn off LED
}
}
}
ISR (USART_RX_vect)
{
char ReceivedByte;
ReceivedByte = UDR0;
UDR0 = ReceivedByte;
}
With this code, it simply just recognizes the input number in decimal, not binary, so I don't know what I really need to do now. I see the task might need to use Parity bit, is that correct? Or do I need to use something else?
Do yourself a favour and please read How to get the best out of this forum and modify your post accordingly (including code tags and necessary documentation for your ask).
Sorry, the code is incomplete and I'm still working on it.
What I mean is, for example, the txt file has 8 lines, each line has 8 bits that includes "0" and "1", and the total of bit "1" in that file is 10, so that's even numbers of "1". If that file contains 9 bit "1" then it's odd.
1. Does that mean that you are required to write only register level codes? 2. Are you allowed to use the setup() and loop() functions of the IDE?
Just send this bit pattern: 10101010101 from the InputBox of the Serial Monitor (with Line ending option at Newline) to the sketch of your post #1, count for the even number of 1s and then ignite LED connected at PORTB5-pin (the built-in LED of UNO).
Check if the following sketch is useful for you (tested on UNO). Select Newline option of the Line end tab of the Serial Monitor (Fig-1). This sketch counts for even number of 1s from Newline-terminated 1010... -type string coming from the Serial Monitor.
#ifndef F_CPU
#define F_CPU 16000000UL // Set 16 MHz clock speed
#endif
#include <avr/io.h>
#define USART_BAUDRATE 9600
#define BAUD_PRESCALE (((( F_CPU / 16) + ( USART_BAUDRATE / 2)) / ( USART_BAUDRATE )) - 1)
#include <avr/interrupt.h>
char ReceivedByte ; //Variable to store the data (1 byte) read from the register
volatile byte counter;
void setup()//int main ( void )
{
//Setup the Baud Rate
UBRR0H = ( BAUD_PRESCALE >> 8); // Load upper 8- bits of the baud rate value into the high byte of the UBRR0H register
UBRR0L = BAUD_PRESCALE ; // Load lower 8- bits of the baud rate value into the low byte of the UBRR0L register
//Configure data format for transmission
UCSR0C = (1 << UCSZ00 ) | (1 << UCSZ01 ); // Use 8- bit character sizes
UCSR0B = (1 << RXEN0 ) | (1 << TXEN0 ); // Turn on the transmission and reception circuitry
UCSR0B |= (1 << RXCIE0);
DDRB = 0xFF;
PORTB &= ~ (1 << PORTB5); // Turn off LED
sei();
}
void loop(){}
ISR (USART_RX_vect)
{
ReceivedByte = UDR0;
UDR0 = ReceivedByte; //00110011
if (ReceivedByte != 0x0A) //More bits are yet to arrive from Serial Monitor
{
if (ReceivedByte == 0x31) //1 has arrived from Serial Monitor
{
counter++;
}
}
else
{
if (counter % 2 == 0) //counter contains even number of 1s
{
PORTB |= (1 << PORTB5); // Turn on LED
counter = 0;
}
else
{
PORTB &= ~ (1 << PORTB5); // Turn off LED
counter = 0;
}
}
}
It seems to run fine and count exact number of 1s, however, it can only count each line at a time, if I send in a file containing multiple lines, it doesn't work. But thank you for your help!
