write_bit bug

[fonsoreyes]

write_bit has a bug. Actually it writes 5V in the bus when it must allow it float.

void OneWire::write_bit(uint8_t v)
{
IO_REG_TYPE mask IO_REG_MASK_ATTR = bitmask;
volatile IO_REG_TYPE *reg IO_REG_BASE_ATTR = baseReg;

if (v & 1) {
	noInterrupts();
	DIRECT_WRITE_LOW(reg, mask);
	DIRECT_MODE_OUTPUT(reg, mask);	// drive output low
	delayMicroseconds(10);
	DIRECT_WRITE_HIGH(reg, mask);	// --> must be DIRECT_MODE_INPUT to allow it to float
	interrupts();
	delayMicroseconds(55);
} else {
	noInterrupts();
	DIRECT_WRITE_LOW(reg, mask);
	DIRECT_MODE_OUTPUT(reg, mask);	// drive output low
	delayMicroseconds(65);
	DIRECT_WRITE_HIGH(reg, mask);	// --> must be DIRECT_MODE_INPUT to allow it to float
	interrupts();
	delayMicroseconds(5);
}

}

This way the bus can be 3,3V or 5V.

Best regards

[PaulStoffregen]

closing this as a duplicate of #60