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Diff: SoftSerialSendOnly/SoftSerialSendOnry_tx.cpp
- Revision:
- 1:e2ca99ac317b
diff -r e86fd348cd96 -r e2ca99ac317b SoftSerialSendOnly/SoftSerialSendOnry_tx.cpp --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/SoftSerialSendOnly/SoftSerialSendOnry_tx.cpp Fri Dec 18 04:34:22 2015 +0000 @@ -0,0 +1,80 @@ +#include "SoftSerialSendOnry.h" + +int SoftSerialSendOnry::_putc(int c) +{ + while(!writeable()); + prepare_tx(c); + tx_bit = 0; + txticker.prime(); + tx_handler(); + return 0; +} + +void SoftSerialSendOnry::send_break(void) { + while(!writeable()); + tx_bit = 0; //Just to make sure it appears as non-writable to other threads/IRQs + tx->write(0); + wait_us((bit_period * _total_bits * 3) / 2); + tx->write(1); + tx_bit = -1; +} + +int SoftSerialSendOnry::writeable(void) +{ + if (!tx_en) + return false; + if (tx_bit == -1) + return true; + return false; +} + +void SoftSerialSendOnry::tx_handler(void) +{ + if (tx_bit == _total_bits) { + tx_bit = -1; + fpointer[TxIrq].call(); + return; + } + + //Flip output + int cur_out = tx->read(); + tx->write(!cur_out); + + //Calculate when to do it again + int count = bit_period; + tx_bit++; + while(((_char >> tx_bit) & 0x01) == !cur_out) { + count+=bit_period; + tx_bit++; + } + + txticker.setNext(count); +} + +void SoftSerialSendOnry::prepare_tx(int c) +{ + _char = c << 1; + + bool parity; + switch (_parity) { + case Forced1: + _char |= 1 << (_bits + 1); + case Even: + parity = false; + for (int i = 0; i<_bits; i++) { + if (((_char >> i) & 0x01) == 1) + parity = !parity; + } + _char |= parity << (_bits + 1); + case Odd: + parity = true; + for (int i = 0; i<_bits; i++) { + if (((_char >> i) & 0x01) == 1) + parity = !parity; + } + _char |= parity << (_bits + 1); + } + + _char |= 0xFFFF << (1 + _bits + (bool)_parity); + _char &= ~(1<<_total_bits); +}