/* -------------------------------------------------------------------------- */
ssize_t
_read_r (struct _reent *reent,
int file,
void *b,
size_t len)
{
char *buf = (char*) b;
if (STDIN_FILENO == file)
{
if (BOARD_HAS_UART)
{
/* UART supported. Read from it */
int i;
for (i = 0; i < len; i++)
{
buf[i] = __uart_getc ();
#ifdef UART_AUTO_ECHO
__uart_putc (buf[i]);
#endif
/* Return partial buffer if we get EOL */
if ('\n' == buf[i])
{
return i;
}
}
return i; /* Filled the buffer */
}
else
{
return 0; /* EOF */
}
}
else
{
reent->_errno = EBADF;
return -1;
}
} /* _read () */
int main(void)
{
printf("\r\n");
printf("Timer + UART demo\r\n");
printf("Press any key to increment the LED counter, except backspace which will\r\n");
printf("cause it to decrement\r\n");
/* Set the GPIO to all out */
char dir = 0xff;
*(gpio_base+1) = dir;
/* Initialise with the first data value */
*(gpio_base+0) = dat;
/* Initialise the counter at 1Hz, it won't start yet */
or1k_timer_init(1);
/* Install a custom timer handler */
or1k_exception_handler_add(0x5,or1k_timer_interrupt_handler_new);
/* OK, start the timer now */
or1k_timer_enable();
/* Now loop and check for UART input */
while (1)
{
char c = __uart_getc();
/* If it was backspace, decrement the LEDs */
if (c==0x7f)
dat-=2;
/* Update the GPIO LED output on any keypress, just like the timer had
gone off */
or1k_timer_user_handler();
}
return 0;
}
