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| 1 | #include <stdio.h> | |
| 2 | #include <stdint.h> | |
| 3 | #include <ctype.h> | |
| 4 | #include <avr/io.h> // include I/O definitions (port names, pin names, etc) | |
| 5 | #include <avr/interrupt.h> // include interrupt support | |
| 6 | #define USART_BAUDRATE 9600 | |
| 7 | #define F_CPU 8000000 | |
| 8 | #define MYUBRR F_CPU/16/USART_BAUDRATE-1 | |
| 9 | static volatile unsigned char temp; //so it is global, because we can not return from interrupt | |
| 10 | ||
| 11 | int printCHAR(char character, FILE *stream) | |
| 12 | {
| |
| 13 | while ((UCSR0A & (1 << UDRE)) == 0) {};
| |
| 14 | ||
| 15 | UDR0 = character; | |
| 16 | ||
| 17 | return 0; | |
| 18 | } | |
| 19 | ||
| 20 | FILE uart_str = FDEV_SETUP_STREAM(printCHAR, NULL, _FDEV_SETUP_RW); | |
| 21 | ||
| 22 | ||
| 23 | void adc_init(void) // Function to initialise the ADC feature | |
| 24 | {
| |
| 25 | ADCSRA=0X00; // Clear previous ADC results and status flags | |
| 26 | ADMUX |= (1 << ADLAR) | (1 << REFS0); | |
| 27 | ADCSRA |= (1 << ADSC) | (1 << ADEN) | (1 << ADPS1) | (1 << ADPS2)|(1<<ADIE); //interrpts now enabled | |
| 28 | } | |
| 29 | ||
| 30 | ||
| 31 | ||
| 32 | ||
| 33 | /*unsigned char adc_start(unsigned char channel) // Function to perform an ADC conversion, Takes 0-8 as input | |
| 34 | // to select which input to convert | |
| 35 | {
| |
| 36 | unsigned char i; | |
| 37 | ADCH=0x00; // Clear the previous result | |
| 38 | ||
| 39 | i=channel&0x07; // Decide which line to perform ADC conversion on | |
| 40 | ADMUX=i|0x60; // Enter which line to perform in the ADC control register | |
| 41 | ADCSRA|=1<<ADSC; | |
| 42 | ||
| 43 | while(ADCSRA & (1<<ADSC)); // wait for conv. to complete | |
| 44 | unsigned char temp=ADCH; //unsigned int temp=ADC; for 10 bits | |
| 45 | return temp; | |
| 46 | } | |
| 47 | */ | |
| 48 | ISR(ADC_vect){
| |
| 49 | // NOT USING ADC CHANNEL SELECTOR FOR NOW | |
| 50 | // | |
| 51 | // | |
| 52 | // unsigned char i; | |
| 53 | // ADCH=0x00; // Clear the previous result | |
| 54 | // i=channel&0x07; // Decide which line to perform ADC conversion on | |
| 55 | // ADMUX=i|0x60; // Enter which line to perform in the ADC control register | |
| 56 | // wait for conv. to complete | |
| 57 | temp = ADCH; //unsigned int temp=ADC; for 10 bits | |
| 58 | printf("read: %d \n\r", temp);
| |
| 59 | ADCSRA|=1<<ADSC; | |
| 60 | } | |
| 61 | ||
| 62 | int main (void) | |
| 63 | {
| |
| 64 | ||
| 65 | UCSR0B |= (1 << RXEN) | (1 << TXEN); // Turn on the transmission and reception circuitry | |
| 66 | UCSR0C |= (1 << UCSZ0) | (1 << UCSZ1); // Use 8-bit character sizes | |
| 67 | UBRR0H = (MYUBRR >> 8); // Load upper 8-bits of the baud rate value into the high byte of the UBRR register | |
| 68 | UBRR0L = MYUBRR; // Load lower 8-bits of the baud rate value into the low byte of the UBRR register | |
| 69 | stdout = &uart_str; | |
| 70 | printf("Hello World\n\r");
| |
| 71 | uint8_t result=0; | |
| 72 | adc_init(); | |
| 73 | sei();//global interrupts enable | |
| 74 | ||
| 75 | while(1){
| |
| 76 | } | |
| 77 | ||
| 78 | ||
| 79 | } |
