Created
July 20, 2016 02:58
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#include <avr/io.h> | |
#include <stdio.h> | |
void usart_putchar(char data); | |
int usart_putchar_printf(char var, FILE *stream); | |
static FILE mystdout; /* FDEV_SETUP_STREAM(usart_putchar_printf, NULL, _FDEV_SETUP_WRITE); */ | |
void usart_putchar(char data) | |
{ | |
// Wait for empty transmit buffer | |
while ( !( UCSR0A & (1 << UDRE0)) ) ; | |
// Put data into buffer, sends the data | |
UDR0 = (unsigned char)data; | |
} | |
// this function is called by printf as a stream handler | |
int usart_putchar_printf(char var, FILE *stream) | |
{ | |
// translate \n to \r for br@y++ terminal | |
if (var == '\n') usart_putchar('\r'); | |
usart_putchar(var); | |
return 0; | |
} | |
void retarget_stdio(void) | |
{ | |
// setup our stdio stream | |
mystdout.put = usart_putchar_printf; | |
mystdout.get = NULL; | |
mystdout.flags = _FDEV_SETUP_WRITE; | |
mystdout.udata = 0; | |
stdout = &mystdout; | |
} | |
void setup(void) | |
{ | |
Serial.begin(19200); | |
retarget_stdio(); | |
puts("*** START ***"); | |
} | |
void loop(void) | |
{ | |
static uint32_t count = 0; | |
static float realnum = 0.23; | |
printf("count = %04u\r\n", count++); | |
printf("real number = %7.2f\r\n\r\n", realnum); | |
realnum += 1.47; | |
delay(1000); | |
} |
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