audio sensor MCU code

audio sensor MCU code

#include <avr/io.h> #include <util/delay.h> #define FOSC 16000000 #define BAUD 9600 #define UBRR FOSC/16/BAUD-1 // Initialize USART0 void init_USART0(unsigned int baud) { UBRR0 = baud; // Set Baudrate UCSR0C = (3<<UCSZ00); // Character Size 8 bit UCSR0B |= _BV(RXEN0) | _BV(TXEN0); // Receiver and Transmitter Enable } // Set Receive Interrupt Enable void setRXCIE_USART0() { UCSR0B |= _BV(RXCIE0); } // Receive 1 byte Data unsigned char receive_1byte_USART0(void) { loop_until_bit_is_set(UCSR0A, RXC0); return UDR0; } // Transmit 1 byte Data void transmit_1byte_USART0(unsigned char data) { loop_until_bit_is_set(UCSR0A, UDRE0); UDR0 = data; } // Transmit String Data void transmit_str_USART0(char *str) { while (*str != 0) { transmit_1byte_USART0(*str); *str++; } } // Transmit Four-Digit Integer void transmit_4digit_USART0(int num) { unsigned char temp; int digit = 1000; while (digit != 0) { temp = num / digit; transmit_1byte_USART0('0'+temp); num -= (digit*temp); digit /= 10; } } int main() { ADCSRA |= (1 << ADPS2) | (1 << ADPS1) | (1 << ADPS0); // Set ADC prescalar to 128 - 125KHz sample rate @ 16MHz ADMUX |= (1 << REFS0); // Set ADC reference to AVCC ADMUX |= (1 << ADLAR); // Left adjust ADC result to allow easy 8 bit reading // No MUX values needed to be changed to use ADC0 ADCSRA |= (1 << ADATE); // Set ADC to Free-Running Mode ADCSRA |= (1 << ADEN); // Enable ADC ADCSRA |= (1 << ADSC); // Start A2D Conversions init_USART0(UBRR); // initialize USART0 int adcvalue; while (1) { if ('a' == receive_1byte_USART0()) { adcvalue = (unsigned int)ADCH; transmit_1byte_USART0((char)adcvalue); } } return 0; }