/* Write character to USART0. This blocks. */
int
usart0_putc (char ch)
{
if (ch == '\n')
usart0_putc ('\r');
USART0_PUTC (ch);
return ch;
}
/* Write string to USART0. This blocks until the string is written. */
int
usart0_puts (const char *str)
{
while (*str)
{
if (usart0_putc (*str++) < 0)
return -1;
}
return 1;
}
/**
* Writes an array of bytes with
* the length n
* @param n Number of bytes to write
* @param array Array of bytes to be written
* @return Number of bytes written
*/
int usart0_putn(size_t n, const uint8_t *array) {
if (array == NULL) return -1;
int i;
for (i = 0; i < n; ++i){
usart0_putc(array[i]);
}
return i;
}
/**
* Writes a null terminated c-string
* to the USART
*
* @param str String that is written
* @return Number of bytes written
*/
int usart0_puts(const char *str) {
if (str == NULL) return -1;
int i = 0;
while(str[i] != '\0'){
usart0_putc(str[i++]);
}
return i;
}
void main(void)
{
clock_init();
usart0_init();
/* Give PIO control over the RGB pins */
SAM3_PIOA.enable = (1 << 20) | (1 << 16) | (1 << 0);
SAM3_PIOA.output_enable = (1 << 20) | (1 << 16) | (1 << 0);
/* Drive them */
for (;;) {
SAM3_PIOA.set_output_data = (1 << 20) | (1 << 16) | (1 << 0);
delay_ms(100);
SAM3_PIOA.clear_output_data = (1 << 20) | (1 << 16) | (1 << 0);
delay_ms(100);
usart0_putc('X');
}
}
/**
* Put a byte on USART. unless
* USART0_NON_UNIX_LIKE_LINE_ENDINGS is
* defined this will put a '\r' before every '\n'
* to mimic unix like line endings
*
* @param c Byte to transmit
* @return positive if success
*/
int usart0_putc(const uint8_t c) {
#ifndef USART0_NON_UNIX_LIKE_LINE_ENDINGS
if(c == '\n'){
usart0_putc('\r');
}
#endif
#ifdef NO_USART0_BUFFERED_OUTPUT
while (USART0_TX_IS_BUSY());
UDR0 = c;
#else
// Wait for free space in buffer
while (rb_push(&usart0_outBuff, c) != 0);
USART0_ENABLE_DATA_REG_EMPTY_INTERRUPT();
#endif
return c;
}
