Junichi Katsu / Mbed 2 deprecated MilkcocoaSampleESP8266_LED

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Dependencies:   Milkcocoa mbed

Fork of MilkcocoaSampleESP8266 by Junichi Katsu

SoftSerialSendOnly/SoftSerialSendOnry_tx.cpp@2:d2e4e7ce7a65, 2016-02-27 (annotated)

Committer:
jksoft
Date:
Sat Feb 27 00:12:32 2016 +0000
Revision:
2:d2e4e7ce7a65
Parent:
0:82d5445a9461 
??

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jksoft 0:82d5445a9461 1 #include "SoftSerialSendOnry.h"
jksoft 0:82d5445a9461 2
jksoft 0:82d5445a9461 3 int SoftSerialSendOnry::_putc(int c)
jksoft 0:82d5445a9461 4 {
jksoft 0:82d5445a9461 5 while(!writeable());
jksoft 0:82d5445a9461 6 prepare_tx(c);
jksoft 0:82d5445a9461 7 tx_bit = 0;
jksoft 0:82d5445a9461 8 txticker.prime();
jksoft 0:82d5445a9461 9 tx_handler();
jksoft 0:82d5445a9461 10 return 0;
jksoft 0:82d5445a9461 11 }
jksoft 0:82d5445a9461 12
jksoft 0:82d5445a9461 13 void SoftSerialSendOnry::send_break(void) {
jksoft 0:82d5445a9461 14 while(!writeable());
jksoft 0:82d5445a9461 15 tx_bit = 0; //Just to make sure it appears as non-writable to other threads/IRQs
jksoft 0:82d5445a9461 16 tx->write(0);
jksoft 0:82d5445a9461 17 wait_us((bit_period * _total_bits * 3) / 2);
jksoft 0:82d5445a9461 18 tx->write(1);
jksoft 0:82d5445a9461 19 tx_bit = -1;
jksoft 0:82d5445a9461 20 }
jksoft 0:82d5445a9461 21
jksoft 0:82d5445a9461 22 int SoftSerialSendOnry::writeable(void)
jksoft 0:82d5445a9461 23 {
jksoft 0:82d5445a9461 24 if (!tx_en)
jksoft 0:82d5445a9461 25 return false;
jksoft 0:82d5445a9461 26 if (tx_bit == -1)
jksoft 0:82d5445a9461 27 return true;
jksoft 0:82d5445a9461 28 return false;
jksoft 0:82d5445a9461 29 }
jksoft 0:82d5445a9461 30
jksoft 0:82d5445a9461 31 void SoftSerialSendOnry::tx_handler(void)
jksoft 0:82d5445a9461 32 {
jksoft 0:82d5445a9461 33 if (tx_bit == _total_bits) {
jksoft 0:82d5445a9461 34 tx_bit = -1;
jksoft 0:82d5445a9461 35 fpointer[TxIrq].call();
jksoft 0:82d5445a9461 36 return;
jksoft 0:82d5445a9461 37 }
jksoft 0:82d5445a9461 38
jksoft 0:82d5445a9461 39 //Flip output
jksoft 0:82d5445a9461 40 int cur_out = tx->read();
jksoft 0:82d5445a9461 41 tx->write(!cur_out);
jksoft 0:82d5445a9461 42
jksoft 0:82d5445a9461 43 //Calculate when to do it again
jksoft 0:82d5445a9461 44 int count = bit_period;
jksoft 0:82d5445a9461 45 tx_bit++;
jksoft 0:82d5445a9461 46 while(((_char >> tx_bit) & 0x01) == !cur_out) {
jksoft 0:82d5445a9461 47 count+=bit_period;
jksoft 0:82d5445a9461 48 tx_bit++;
jksoft 0:82d5445a9461 49 }
jksoft 0:82d5445a9461 50
jksoft 0:82d5445a9461 51 txticker.setNext(count);
jksoft 0:82d5445a9461 52 }
jksoft 0:82d5445a9461 53
jksoft 0:82d5445a9461 54 void SoftSerialSendOnry::prepare_tx(int c)
jksoft 0:82d5445a9461 55 {
jksoft 0:82d5445a9461 56 _char = c << 1;
jksoft 0:82d5445a9461 57
jksoft 0:82d5445a9461 58 bool parity;
jksoft 0:82d5445a9461 59 switch (_parity) {
jksoft 0:82d5445a9461 60 case Forced1:
jksoft 0:82d5445a9461 61 _char |= 1 << (_bits + 1);
jksoft 0:82d5445a9461 62 case Even:
jksoft 0:82d5445a9461 63 parity = false;
jksoft 0:82d5445a9461 64 for (int i = 0; i<_bits; i++) {
jksoft 0:82d5445a9461 65 if (((_char >> i) & 0x01) == 1)
jksoft 0:82d5445a9461 66 parity = !parity;
jksoft 0:82d5445a9461 67 }
jksoft 0:82d5445a9461 68 _char |= parity << (_bits + 1);
jksoft 0:82d5445a9461 69 case Odd:
jksoft 0:82d5445a9461 70 parity = true;
jksoft 0:82d5445a9461 71 for (int i = 0; i<_bits; i++) {
jksoft 0:82d5445a9461 72 if (((_char >> i) & 0x01) == 1)
jksoft 0:82d5445a9461 73 parity = !parity;
jksoft 0:82d5445a9461 74 }
jksoft 0:82d5445a9461 75 _char |= parity << (_bits + 1);
jksoft 0:82d5445a9461 76 }
jksoft 0:82d5445a9461 77
jksoft 0:82d5445a9461 78 _char |= 0xFFFF << (1 + _bits + (bool)_parity);
jksoft 0:82d5445a9461 79 _char &= ~(1<<_total_bits);
jksoft 0:82d5445a9461 80 }