Junichi Katsu / Mbed 2 deprecated MilkcocoaESP8266_DHT11

ワークショップ用のサンプルプログラムです。

Dependencies:   DHT Milkcocoa mbed

SoftSerialSendOnly/SoftSerialSendOnry_tx.cpp@0:8ac5bb04e34d, 2016-04-29 (annotated)

Committer:
jksoft
Date:
Fri Apr 29 21:31:00 2016 +0000
Revision:
0:8ac5bb04e34d
??

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jksoft 0:8ac5bb04e34d 1 #include "SoftSerialSendOnry.h"
jksoft 0:8ac5bb04e34d 2
jksoft 0:8ac5bb04e34d 3 int SoftSerialSendOnry::_putc(int c)
jksoft 0:8ac5bb04e34d 4 {
jksoft 0:8ac5bb04e34d 5 while(!writeable());
jksoft 0:8ac5bb04e34d 6 prepare_tx(c);
jksoft 0:8ac5bb04e34d 7 tx_bit = 0;
jksoft 0:8ac5bb04e34d 8 txticker.prime();
jksoft 0:8ac5bb04e34d 9 tx_handler();
jksoft 0:8ac5bb04e34d 10 return 0;
jksoft 0:8ac5bb04e34d 11 }
jksoft 0:8ac5bb04e34d 12
jksoft 0:8ac5bb04e34d 13 void SoftSerialSendOnry::send_break(void) {
jksoft 0:8ac5bb04e34d 14 while(!writeable());
jksoft 0:8ac5bb04e34d 15 tx_bit = 0; //Just to make sure it appears as non-writable to other threads/IRQs
jksoft 0:8ac5bb04e34d 16 tx->write(0);
jksoft 0:8ac5bb04e34d 17 wait_us((bit_period * _total_bits * 3) / 2);
jksoft 0:8ac5bb04e34d 18 tx->write(1);
jksoft 0:8ac5bb04e34d 19 tx_bit = -1;
jksoft 0:8ac5bb04e34d 20 }
jksoft 0:8ac5bb04e34d 21
jksoft 0:8ac5bb04e34d 22 int SoftSerialSendOnry::writeable(void)
jksoft 0:8ac5bb04e34d 23 {
jksoft 0:8ac5bb04e34d 24 if (!tx_en)
jksoft 0:8ac5bb04e34d 25 return false;
jksoft 0:8ac5bb04e34d 26 if (tx_bit == -1)
jksoft 0:8ac5bb04e34d 27 return true;
jksoft 0:8ac5bb04e34d 28 return false;
jksoft 0:8ac5bb04e34d 29 }
jksoft 0:8ac5bb04e34d 30
jksoft 0:8ac5bb04e34d 31 void SoftSerialSendOnry::tx_handler(void)
jksoft 0:8ac5bb04e34d 32 {
jksoft 0:8ac5bb04e34d 33 if (tx_bit == _total_bits) {
jksoft 0:8ac5bb04e34d 34 tx_bit = -1;
jksoft 0:8ac5bb04e34d 35 fpointer[TxIrq].call();
jksoft 0:8ac5bb04e34d 36 return;
jksoft 0:8ac5bb04e34d 37 }
jksoft 0:8ac5bb04e34d 38
jksoft 0:8ac5bb04e34d 39 //Flip output
jksoft 0:8ac5bb04e34d 40 int cur_out = tx->read();
jksoft 0:8ac5bb04e34d 41 tx->write(!cur_out);
jksoft 0:8ac5bb04e34d 42
jksoft 0:8ac5bb04e34d 43 //Calculate when to do it again
jksoft 0:8ac5bb04e34d 44 int count = bit_period;
jksoft 0:8ac5bb04e34d 45 tx_bit++;
jksoft 0:8ac5bb04e34d 46 while(((_char >> tx_bit) & 0x01) == !cur_out) {
jksoft 0:8ac5bb04e34d 47 count+=bit_period;
jksoft 0:8ac5bb04e34d 48 tx_bit++;
jksoft 0:8ac5bb04e34d 49 }
jksoft 0:8ac5bb04e34d 50
jksoft 0:8ac5bb04e34d 51 txticker.setNext(count);
jksoft 0:8ac5bb04e34d 52 }
jksoft 0:8ac5bb04e34d 53
jksoft 0:8ac5bb04e34d 54 void SoftSerialSendOnry::prepare_tx(int c)
jksoft 0:8ac5bb04e34d 55 {
jksoft 0:8ac5bb04e34d 56 _char = c << 1;
jksoft 0:8ac5bb04e34d 57
jksoft 0:8ac5bb04e34d 58 bool parity;
jksoft 0:8ac5bb04e34d 59 switch (_parity) {
jksoft 0:8ac5bb04e34d 60 case Forced1:
jksoft 0:8ac5bb04e34d 61 _char |= 1 << (_bits + 1);
jksoft 0:8ac5bb04e34d 62 case Even:
jksoft 0:8ac5bb04e34d 63 parity = false;
jksoft 0:8ac5bb04e34d 64 for (int i = 0; i<_bits; i++) {
jksoft 0:8ac5bb04e34d 65 if (((_char >> i) & 0x01) == 1)
jksoft 0:8ac5bb04e34d 66 parity = !parity;
jksoft 0:8ac5bb04e34d 67 }
jksoft 0:8ac5bb04e34d 68 _char |= parity << (_bits + 1);
jksoft 0:8ac5bb04e34d 69 case Odd:
jksoft 0:8ac5bb04e34d 70 parity = true;
jksoft 0:8ac5bb04e34d 71 for (int i = 0; i<_bits; i++) {
jksoft 0:8ac5bb04e34d 72 if (((_char >> i) & 0x01) == 1)
jksoft 0:8ac5bb04e34d 73 parity = !parity;
jksoft 0:8ac5bb04e34d 74 }
jksoft 0:8ac5bb04e34d 75 _char |= parity << (_bits + 1);
jksoft 0:8ac5bb04e34d 76 }
jksoft 0:8ac5bb04e34d 77
jksoft 0:8ac5bb04e34d 78 _char |= 0xFFFF << (1 + _bits + (bool)_parity);
jksoft 0:8ac5bb04e34d 79 _char &= ~(1<<_total_bits);
jksoft 0:8ac5bb04e34d 80 }