我想通过串行总线向 PC 发送一些字符串。在可爱的 com 中，它显示的字符串和一些字符丢失了，并且在字符串的开头和结尾附加了一些十六进制数字。为什么会出现这个问题我不知道请帮助解决这个问题。我的代码在这里。
#include <avr/io.h>
#include <string.h>
#include <avr/interrupt.h>
#define F_CPU 16000000UL
#include <util/delay.h>
#define USART_BAUDRATE 9600 // Baud Rate value
#define BAUD_PRESCALE (((F_CPU / (USART_BAUDRATE * 16UL))) - 1)
void usart_init() {
//Enable communication in duplex mode
UCSR1A = (1 << U2X1);
UCSR1B |= (1 << RXEN1) | (1 << TXEN1); // Turn on the transmission and reception circuitry
UCSR1C &= ~(1 << UMSEL1);
UCSR1C |= (1<<USBS1) | (1 << UCSZ10) | (1 << UCSZ11);
UBRR1L = BAUD_PRESCALE; // Load lower 8-bits of the baud rate value into the low byte of the UBRR register
UBRR1H = (BAUD_PRESCALE >> 8); // Load upper 8-bits of the baud rate value..
}
void serial_write(unsigned char data) {
while(!(UCSR1A & (1<<UDRE1)))
;
UDR1 = data;
_delay_ms(10);
}
void transmitString(unsigned char *str) {
int i;
for(i=0;i<strlen(str);i++) {
serial_write(str[i]);
_delay_ms(1);
}
}
int main() {
cli();
usart_init();
unsigned char buffer[20];
strcpy(buffer, "Walk Alone");
while(1) {
transmitString(buffer);
//_delay_ms(250);
}
return 0;
}