void _serial_fini(void)
{
int delay = _clkfreq/2;
int waitcycles = _CNT + delay;
/* sleep a bit to let things drain */
waitcycles = __builtin_propeller_waitcnt(waitcycles, delay);
/* send a break */
_OUTA = 0;
__builtin_propeller_waitcnt(waitcycles, delay);
}
int _serial_tx(int c, unsigned int txmask, unsigned int bitcycles)
{
unsigned int waitcycles;
int i, value;
/* set output */
_OUTA |= txmask;
_DIRA |= txmask;
value = (c | 256) << 1;
waitcycles = getcnt() + bitcycles;
for (i = 0; i < 10; i++)
{
waitcycles = __builtin_propeller_waitcnt(waitcycles, bitcycles);
if (value & 1)
_OUTA |= txmask;
else
_OUTA &= ~txmask;
value >>= 1;
}
// if we turn off DIRA, then some boards (like QuickStart) are left with
// floating pins and garbage output; if we leave it on, we're left with
// a high pin and other cogs cannot produce output on it
// the solution is to use FullDuplexSerialDriver instead on applications
// with multiple cogs
//_DIRA &= ~txmask;
return c;
}
int __attribute__((section(".hubtext"))) _serial_tx(int value)
{
int i;
int txpin = _txpin;
int bitcycles = _bitcycles;
int waitcycles = _CNT + bitcycles;
value = (value | 256) << 1;
for (i = 0; i < 10; i++)
{
waitcycles = __builtin_propeller_waitcnt(waitcycles, bitcycles);
_OUTA = (value & 1) << txpin;
value >>= 1;
}
return 1;
}
