DFPplay 모듈을 사서 하고 있는데 얘가 작동을 안하네요,,
코드상 문제만 있는지 봐주실수 있으신가요?
#include <mega128a.h>
#include <delay.h>
char default_buffer[10] = {0x7E, 0xFF, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xEF}; // Default Buffer
volatile char mp3_cmd_buf[10] = {0x7E, 0xFF, 0x06, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xEF};
void display_OP();
void mp3_send_cmd(char cmd, char MSB, char LSB);
void USART0_Transmit( char data );
int MP3_checksum (void);
void main(void)
{
UCSR0A = 0x0;
UCSR0B = 0x18;
UCSR0C = 0x06;
UBRR0H = 0;
UBRR0L = 103;
display_OP();
while (1)
    {
    // Please write your application code here
       mp3_send_cmd(0x12,0,1); delay_ms(5000); // 0001.mp3 Play
    }
}
void display_OP(){
     mp3_send_cmd(9,0,2);delay_ms(10); 
    mp3_send_cmd(6, 0, 0x1E); delay_ms(10);
}
void mp3_send_cmd(char cmd, char MSB, char LSB){
    int i;
    int checksum;
    mp3_cmd_buf[3] = cmd;
    mp3_cmd_buf[5] = MSB;
    mp3_cmd_buf[6] = LSB;  
    //volatile INT8 mp3_cmd_buf[10] = {0x7E, 0xFF, 0x06, 0x09, 0x00, 0x00, 0x01, 0x00, 0x00, 0xEF};
    checksum = MP3_checksum();
    mp3_cmd_buf[7] = ((checksum >> 8) & 0x00FF);
    mp3_cmd_buf[8] = (checksum & 0x00FF);
    for( i=0; i< 10; i++){
        USART0_Transmit(mp3_cmd_buf[i]);
        mp3_cmd_buf[i] = default_buffer[i];
    }
}
int MP3_checksum (void)
{
    int sum = 0;
    int i;
    for (i=1; i<7; i++) {
        sum += mp3_cmd_buf[i];
    }
    return -sum;
}
void USART0_Transmit( char data )
{
    // Wait for empty transmit buffer
    while (!( UCSR0A & 0x20 ) )   // (1<<UDRE) 
    UDR0 = data;
}