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#define TXBSIZE 128
static char txbuf[TXBSIZE];
static uint8_t txput = 0, txsend = 0;
ISR(USART_RX_vect)
{
uint8_t data = UDR0;
}
ISR(USART_UDRE_vect)
{
if (txsend != txput) {
UDR0 = txbuf[txsend];
txsend++;
txsend &= TXBSIZE - 1;
UCSR0B = (1 << RXCIE0) | (1 << UDRIE0) | (1 << RXEN0) | (1 << TXEN0);
} else {
UCSR0B = (1 << RXCIE0) | (1 << RXEN0) | (1 << TXEN0);
}
}
static void _uart_putch(const char ch)
{
txbuf[txput] = ch;
txput++;
txput &= TXBSIZE - 1;
}
static void uart_putpgm(PGM_P str)
{
char c;
uint8_t sreg = SREG;
cli();
do {
c = pgm_read_byte(str);
if (!c)
break;
_uart_putch(c);
str++;
} while (1);
if (UCSR0A & (1 << UDRE0))
__vector_19();
SREG = sreg;
}
#define uart_puts(str) do { \
static const char _mystr[] PROGMEM = str; \
uart_putpgm(_mystr); } while (0)
#define hexdigit(x) ((x) + '0' + ((x) > 9 ? ('a' - '0' - 10) : 0))
static void uart_puthex(uint8_t val)
{
uint8_t tmp, sreg = SREG;
cli();
tmp = val >> 4;
tmp += '0';
if (tmp > '9')
tmp += 'a' - '0' - 10;
_uart_putch(tmp);
tmp = val & 0xf;
tmp += '0';
if (tmp > '9')
tmp += 'a' - '0' - 10;
_uart_putch(tmp);
if (UCSR0A & (1 << UDRE0))
__vector_19();
SREG = sreg;
}
static void uart_init(void)
{
UBRR0 = 12; /* 38461 ~ 38400 */
UCSR0C = (1 << UCSZ01) | (1 << UCSZ00);
UCSR0B = (1 << RXCIE0) | (1 << RXEN0) | (1 << TXEN0);
}
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