50 lines
1.0 KiB
C
50 lines
1.0 KiB
C
//#define F_CPU 16000000
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#include <avr/io.h>
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#include <util/delay.h>
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#include <stdio.h>
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#define BAUDRATE 115200L
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#define SERIAL_FORMAT_8N1 0x06
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FILE* uart_init(void);
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static int uart_putc(char c, FILE *stream);
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static FILE outfile = FDEV_SETUP_STREAM(uart_putc, NULL, _FDEV_SETUP_WRITE);
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int main(void)
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{
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stdout = uart_init();
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DDRC |= (1<<DDC0);
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//pin C0 is pin37 on board
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while(1)
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{
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PORTC |= (1<<PORTC0);
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_delay_ms(1000);
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printf("hello\n");
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PORTC &= ~ (1<<PORTC0);
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_delay_ms(1000);
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printf("world\n");
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}
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}
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FILE* uart_init(void)
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{
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/* configure UART0 baudrate */
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UBRR0H = 0;
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UBRR0L = (uint8_t) (F_CPU / 4 / BAUDRATE - 1) / 2;
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/* set UART0 control and status registers (UCSR0x) */
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UCSR0A |= (1 << U2X0); /* double the transmission speed */
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UCSR0B |= (1 << TXEN0);
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UCSR0C = SERIAL_FORMAT_8N1;
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return &outfile;
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}
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static int uart_putc(char c, FILE *stream)
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{
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loop_until_bit_is_set(UCSR0A, UDRE0);
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UDR0 = (uint8_t)c;
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return c;
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} |