Junichi Katsu / Mbed 2 deprecated Analog_Temp_Sensor

ワークショップ用に公開しているものです。

Dependencies:   mbed

Fork of Arch_Analog_Thermistor_Blinker by Yihui Xiong

SoftSerialSendOnly/SoftSerialSendOnry_tx.cpp@9:5a7dca00d87b, 2016-02-27 (annotated)

Committer:
jksoft
Date:
Sat Feb 27 05:38:49 2016 +0000
Revision:
9:5a7dca00d87b
????????????

Who changed what in which revision?

UserRevisionLine numberNew contents of line
jksoft 9:5a7dca00d87b 1 #include "SoftSerialSendOnry.h"
jksoft 9:5a7dca00d87b 2
jksoft 9:5a7dca00d87b 3 int SoftSerialSendOnry::_putc(int c)
jksoft 9:5a7dca00d87b 4 {
jksoft 9:5a7dca00d87b 5 while(!writeable());
jksoft 9:5a7dca00d87b 6 prepare_tx(c);
jksoft 9:5a7dca00d87b 7 tx_bit = 0;
jksoft 9:5a7dca00d87b 8 txticker.prime();
jksoft 9:5a7dca00d87b 9 tx_handler();
jksoft 9:5a7dca00d87b 10 return 0;
jksoft 9:5a7dca00d87b 11 }
jksoft 9:5a7dca00d87b 12
jksoft 9:5a7dca00d87b 13 void SoftSerialSendOnry::send_break(void) {
jksoft 9:5a7dca00d87b 14 while(!writeable());
jksoft 9:5a7dca00d87b 15 tx_bit = 0; //Just to make sure it appears as non-writable to other threads/IRQs
jksoft 9:5a7dca00d87b 16 tx->write(0);
jksoft 9:5a7dca00d87b 17 wait_us((bit_period * _total_bits * 3) / 2);
jksoft 9:5a7dca00d87b 18 tx->write(1);
jksoft 9:5a7dca00d87b 19 tx_bit = -1;
jksoft 9:5a7dca00d87b 20 }
jksoft 9:5a7dca00d87b 21
jksoft 9:5a7dca00d87b 22 int SoftSerialSendOnry::writeable(void)
jksoft 9:5a7dca00d87b 23 {
jksoft 9:5a7dca00d87b 24 if (!tx_en)
jksoft 9:5a7dca00d87b 25 return false;
jksoft 9:5a7dca00d87b 26 if (tx_bit == -1)
jksoft 9:5a7dca00d87b 27 return true;
jksoft 9:5a7dca00d87b 28 return false;
jksoft 9:5a7dca00d87b 29 }
jksoft 9:5a7dca00d87b 30
jksoft 9:5a7dca00d87b 31 void SoftSerialSendOnry::tx_handler(void)
jksoft 9:5a7dca00d87b 32 {
jksoft 9:5a7dca00d87b 33 if (tx_bit == _total_bits) {
jksoft 9:5a7dca00d87b 34 tx_bit = -1;
jksoft 9:5a7dca00d87b 35 fpointer[TxIrq].call();
jksoft 9:5a7dca00d87b 36 return;
jksoft 9:5a7dca00d87b 37 }
jksoft 9:5a7dca00d87b 38
jksoft 9:5a7dca00d87b 39 //Flip output
jksoft 9:5a7dca00d87b 40 int cur_out = tx->read();
jksoft 9:5a7dca00d87b 41 tx->write(!cur_out);
jksoft 9:5a7dca00d87b 42
jksoft 9:5a7dca00d87b 43 //Calculate when to do it again
jksoft 9:5a7dca00d87b 44 int count = bit_period;
jksoft 9:5a7dca00d87b 45 tx_bit++;
jksoft 9:5a7dca00d87b 46 while(((_char >> tx_bit) & 0x01) == !cur_out) {
jksoft 9:5a7dca00d87b 47 count+=bit_period;
jksoft 9:5a7dca00d87b 48 tx_bit++;
jksoft 9:5a7dca00d87b 49 }
jksoft 9:5a7dca00d87b 50
jksoft 9:5a7dca00d87b 51 txticker.setNext(count);
jksoft 9:5a7dca00d87b 52 }
jksoft 9:5a7dca00d87b 53
jksoft 9:5a7dca00d87b 54 void SoftSerialSendOnry::prepare_tx(int c)
jksoft 9:5a7dca00d87b 55 {
jksoft 9:5a7dca00d87b 56 _char = c << 1;
jksoft 9:5a7dca00d87b 57
jksoft 9:5a7dca00d87b 58 bool parity;
jksoft 9:5a7dca00d87b 59 switch (_parity) {
jksoft 9:5a7dca00d87b 60 case Forced1:
jksoft 9:5a7dca00d87b 61 _char |= 1 << (_bits + 1);
jksoft 9:5a7dca00d87b 62 case Even:
jksoft 9:5a7dca00d87b 63 parity = false;
jksoft 9:5a7dca00d87b 64 for (int i = 0; i<_bits; i++) {
jksoft 9:5a7dca00d87b 65 if (((_char >> i) & 0x01) == 1)
jksoft 9:5a7dca00d87b 66 parity = !parity;
jksoft 9:5a7dca00d87b 67 }
jksoft 9:5a7dca00d87b 68 _char |= parity << (_bits + 1);
jksoft 9:5a7dca00d87b 69 case Odd:
jksoft 9:5a7dca00d87b 70 parity = true;
jksoft 9:5a7dca00d87b 71 for (int i = 0; i<_bits; i++) {
jksoft 9:5a7dca00d87b 72 if (((_char >> i) & 0x01) == 1)
jksoft 9:5a7dca00d87b 73 parity = !parity;
jksoft 9:5a7dca00d87b 74 }
jksoft 9:5a7dca00d87b 75 _char |= parity << (_bits + 1);
jksoft 9:5a7dca00d87b 76 }
jksoft 9:5a7dca00d87b 77
jksoft 9:5a7dca00d87b 78 _char |= 0xFFFF << (1 + _bits + (bool)_parity);
jksoft 9:5a7dca00d87b 79 _char &= ~(1<<_total_bits);
jksoft 9:5a7dca00d87b 80 }