Zhongying Qiao / OneWire2

works with program xAP_enabled_oneWire_Master_Part2

Dependents:   xAP_enabled_oneWire_Master_Part2

Fork of OneWire by Scott Roy

Interface/OneWire.cpp@0:7c6dd6bc20e4, 2013-04-15 (annotated)

Committer:
sroy
Date:
Mon Apr 15 07:02:49 2013 +0000
Revision:
0:7c6dd6bc20e4
An experimental 1-Wire Master interface driven by timer interrupts rather than NOP waits created as part of a University of Glasgow Level 4 Electronic and Software Engineering final year project.   Requires the use of mbed RTOS.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
sroy 0:7c6dd6bc20e4 1 #include "OneWire.h"
sroy 0:7c6dd6bc20e4 2
sroy 0:7c6dd6bc20e4 3 const OneWire_MicroInstruction OneWire::_OneWire_MicroProgram[10] = {&OneWire::_io_low,&OneWire::_io_high,
sroy 0:7c6dd6bc20e4 4 &OneWire::_io_low,&OneWire::_io_high,
sroy 0:7c6dd6bc20e4 5 &OneWire::_io_low,&OneWire::_io_high,&OneWire::_io_read,
sroy 0:7c6dd6bc20e4 6 &OneWire::_io_low,&OneWire::_io_high,&OneWire::_io_read};
sroy 0:7c6dd6bc20e4 7
sroy 0:7c6dd6bc20e4 8 const unsigned short DEFAULT_TIMES[10] = {ONEWIRE_WRITE1LOW, ONEWIRE_TIMESLOT+ONEWIRE_RECOVER-ONEWIRE_WRITE1LOW+ONEWIRE_RECOVER,
sroy 0:7c6dd6bc20e4 9 ONEWIRE_WRITE0LOW, ONEWIRE_TIMESLOT+ONEWIRE_RECOVER-ONEWIRE_WRITE0LOW+ONEWIRE_RECOVER,
sroy 0:7c6dd6bc20e4 10 ONEWIRE_READLOW, ONEWIRE_READDURATION-ONEWIRE_READLOW-1, ONEWIRE_TIMESLOT-ONEWIRE_READDURATION-ONEWIRE_READLOW-1+ONEWIRE_RECOVER,
sroy 0:7c6dd6bc20e4 11 ONEWIRE_TIMESLOT*8, ONEWIRE_PULSEHIGH+ONEWIRE_PULSELOW/2, ONEWIRE_TIMESLOT*8-(ONEWIRE_PULSEHIGH+ONEWIRE_PULSELOW/2)+ONEWIRE_RECOVER};
sroy 0:7c6dd6bc20e4 12
sroy 0:7c6dd6bc20e4 13 void OneWire::_nextmicroinst(){
sroy 0:7c6dd6bc20e4 14 if(_microinstn == 0){
sroy 0:7c6dd6bc20e4 15 _resumeinst();
sroy 0:7c6dd6bc20e4 16 }else{
sroy 0:7c6dd6bc20e4 17 _timer.attach_us(this, &OneWire::_nextmicroinst, timeing[_microinstc]);
sroy 0:7c6dd6bc20e4 18 (this->*_OneWire_MicroProgram[_microinstc++])();
sroy 0:7c6dd6bc20e4 19 _microinstn-= 1;
sroy 0:7c6dd6bc20e4 20 }
sroy 0:7c6dd6bc20e4 21 }
sroy 0:7c6dd6bc20e4 22
sroy 0:7c6dd6bc20e4 23 void OneWire::_resumeinst(){
sroy 0:7c6dd6bc20e4 24 unsigned char offset = _inststate & 0x0F;
sroy 0:7c6dd6bc20e4 25 if(offset < 8){
sroy 0:7c6dd6bc20e4 26 if((execute.code>>offset) & 0x01) op_send1();
sroy 0:7c6dd6bc20e4 27 else op_send0();
sroy 0:7c6dd6bc20e4 28 _inststate+= 1;
sroy 0:7c6dd6bc20e4 29 }else{
sroy 0:7c6dd6bc20e4 30 if(execute.inst == NULL) endInstruction();
sroy 0:7c6dd6bc20e4 31 else (*(execute.inst))(this);
sroy 0:7c6dd6bc20e4 32 }
sroy 0:7c6dd6bc20e4 33
sroy 0:7c6dd6bc20e4 34 }
sroy 0:7c6dd6bc20e4 35
sroy 0:7c6dd6bc20e4 36 void OneWire::_nextinst(){
sroy 0:7c6dd6bc20e4 37 if(_instn > 0){
sroy 0:7c6dd6bc20e4 38 execute = (*_instruction).network;
sroy 0:7c6dd6bc20e4 39 if(execute.inst == NULL) _inststate = 0x08; // skip network and transport command but allow reset
sroy 0:7c6dd6bc20e4 40 else _inststate = 0x10;
sroy 0:7c6dd6bc20e4 41
sroy 0:7c6dd6bc20e4 42 // send reset pulse
sroy 0:7c6dd6bc20e4 43 readhandle = &OneWire::_presencedetect;
sroy 0:7c6dd6bc20e4 44 op_reset();
sroy 0:7c6dd6bc20e4 45 }else{
sroy 0:7c6dd6bc20e4 46 error = SUCCESS;
sroy 0:7c6dd6bc20e4 47 osSignalSet(_caller, 1);
sroy 0:7c6dd6bc20e4 48 }
sroy 0:7c6dd6bc20e4 49 }
sroy 0:7c6dd6bc20e4 50
sroy 0:7c6dd6bc20e4 51 void OneWire::_presencedetect(OneWire * which, char bit){
sroy 0:7c6dd6bc20e4 52 if(bit) which->abort(NO_PRESENCE); // it is pointless to continue when there is no device attached
sroy 0:7c6dd6bc20e4 53 }
sroy 0:7c6dd6bc20e4 54
sroy 0:7c6dd6bc20e4 55 void OneWire::_ei_detect(){
sroy 0:7c6dd6bc20e4 56 if(detecthandle != NULL) (*detecthandle)(this);
sroy 0:7c6dd6bc20e4 57 }
sroy 0:7c6dd6bc20e4 58
sroy 0:7c6dd6bc20e4 59 // Private pin I/O methods
sroy 0:7c6dd6bc20e4 60
sroy 0:7c6dd6bc20e4 61 void OneWire::_io_high(){
sroy 0:7c6dd6bc20e4 62 _pin = 1;
sroy 0:7c6dd6bc20e4 63 }
sroy 0:7c6dd6bc20e4 64
sroy 0:7c6dd6bc20e4 65 void OneWire::_io_low(){
sroy 0:7c6dd6bc20e4 66 _pin = 0;
sroy 0:7c6dd6bc20e4 67 }
sroy 0:7c6dd6bc20e4 68
sroy 0:7c6dd6bc20e4 69 void OneWire::_io_read(){
sroy 0:7c6dd6bc20e4 70 _pin.input();
sroy 0:7c6dd6bc20e4 71 (*readhandle)(this, _pin);
sroy 0:7c6dd6bc20e4 72 _pin.output();
sroy 0:7c6dd6bc20e4 73 }
sroy 0:7c6dd6bc20e4 74
sroy 0:7c6dd6bc20e4 75 // Public utility methods
sroy 0:7c6dd6bc20e4 76
sroy 0:7c6dd6bc20e4 77 OneWire::OneWire(PinName pin) : _pin(pin), _detect(pin){
sroy 0:7c6dd6bc20e4 78 _pin.output();
sroy 0:7c6dd6bc20e4 79 _pin = 1; // turn on devices to allow them to start working
sroy 0:7c6dd6bc20e4 80 _pin.mode(PullUp);
sroy 0:7c6dd6bc20e4 81 _detect.mode(PullUp);
sroy 0:7c6dd6bc20e4 82 _detect.fall(this, &OneWire::_ei_detect);
sroy 0:7c6dd6bc20e4 83 timeing = DEFAULT_TIMES;
sroy 0:7c6dd6bc20e4 84 detecthandle = NULL;
sroy 0:7c6dd6bc20e4 85 }
sroy 0:7c6dd6bc20e4 86
sroy 0:7c6dd6bc20e4 87 int OneWire::send(OneWire_Instruction * inst, unsigned char instnum){
sroy 0:7c6dd6bc20e4 88 _detect.fall(NULL);
sroy 0:7c6dd6bc20e4 89 _instruction = inst;
sroy 0:7c6dd6bc20e4 90 _instn = instnum;
sroy 0:7c6dd6bc20e4 91 _nextinst();
sroy 0:7c6dd6bc20e4 92 _caller = Thread::gettid();
sroy 0:7c6dd6bc20e4 93 Thread::signal_wait(0);
sroy 0:7c6dd6bc20e4 94 osSignalSet(_caller, 0);
sroy 0:7c6dd6bc20e4 95 _detect.fall(this, &OneWire::_ei_detect);
sroy 0:7c6dd6bc20e4 96 return error != SUCCESS;
sroy 0:7c6dd6bc20e4 97 }
sroy 0:7c6dd6bc20e4 98
sroy 0:7c6dd6bc20e4 99 void OneWire::endInstruction(){
sroy 0:7c6dd6bc20e4 100 if(_inststate>>4 && _instruction->transport.inst != NULL){
sroy 0:7c6dd6bc20e4 101 execute = _instruction->transport;
sroy 0:7c6dd6bc20e4 102 _inststate = 0x00;
sroy 0:7c6dd6bc20e4 103 _timer.attach_us(this, &OneWire::_resumeinst, 1); // MAKE TIMING CONFIGURABLE
sroy 0:7c6dd6bc20e4 104 }else{
sroy 0:7c6dd6bc20e4 105 _instruction+= 1;
sroy 0:7c6dd6bc20e4 106 _instn-= 1;
sroy 0:7c6dd6bc20e4 107 _timer.attach_us(this, &OneWire::_nextinst, 1); // MAKE TIMING CONFIGURABLE
sroy 0:7c6dd6bc20e4 108 }
sroy 0:7c6dd6bc20e4 109 }
sroy 0:7c6dd6bc20e4 110
sroy 0:7c6dd6bc20e4 111 // depricated, use at own risk
sroy 0:7c6dd6bc20e4 112 void OneWire::repeatInstruction(){
sroy 0:7c6dd6bc20e4 113 execute = (*_instruction).network;
sroy 0:7c6dd6bc20e4 114 _inststate = 0x10;
sroy 0:7c6dd6bc20e4 115 // send reset pulse
sroy 0:7c6dd6bc20e4 116 readhandle = &OneWire::_presencedetect;
sroy 0:7c6dd6bc20e4 117 op_reset();
sroy 0:7c6dd6bc20e4 118 }
sroy 0:7c6dd6bc20e4 119
sroy 0:7c6dd6bc20e4 120 void OneWire::abort(OneWire_Error err){
sroy 0:7c6dd6bc20e4 121 _timer.detach();
sroy 0:7c6dd6bc20e4 122 error = err;
sroy 0:7c6dd6bc20e4 123 osSignalSet(_caller, 1);
sroy 0:7c6dd6bc20e4 124 }
sroy 0:7c6dd6bc20e4 125
sroy 0:7c6dd6bc20e4 126 // Public IO methods
sroy 0:7c6dd6bc20e4 127
sroy 0:7c6dd6bc20e4 128 void OneWire::op_send1(){
sroy 0:7c6dd6bc20e4 129 _microinstn = 2;
sroy 0:7c6dd6bc20e4 130 _microinstc = 0;
sroy 0:7c6dd6bc20e4 131 _nextmicroinst();
sroy 0:7c6dd6bc20e4 132 }
sroy 0:7c6dd6bc20e4 133
sroy 0:7c6dd6bc20e4 134 void OneWire::op_send0(){
sroy 0:7c6dd6bc20e4 135 _microinstn = 2;
sroy 0:7c6dd6bc20e4 136 _microinstc = 2;
sroy 0:7c6dd6bc20e4 137 _nextmicroinst();
sroy 0:7c6dd6bc20e4 138 }
sroy 0:7c6dd6bc20e4 139
sroy 0:7c6dd6bc20e4 140 void OneWire::op_read(){
sroy 0:7c6dd6bc20e4 141 _microinstn = 3;
sroy 0:7c6dd6bc20e4 142 _microinstc = 4;
sroy 0:7c6dd6bc20e4 143 _nextmicroinst();
sroy 0:7c6dd6bc20e4 144 }
sroy 0:7c6dd6bc20e4 145
sroy 0:7c6dd6bc20e4 146 void OneWire::op_reset(){
sroy 0:7c6dd6bc20e4 147 _microinstn = 3;
sroy 0:7c6dd6bc20e4 148 _microinstc = 7;
sroy 0:7c6dd6bc20e4 149 _nextmicroinst();
sroy 0:7c6dd6bc20e4 150 }