Andrew Boyson / oldheating

Central Heating controller using the real time clock, PHY module for internet, 1-wire interface for temperature sensors, a system log and a configuration file

Dependencies:   net 1-wire lpc1768 crypto clock web fram log

/media/uploads/andrewboyson/heating.sch

/media/uploads/andrewboyson/heating.brd

/media/uploads/andrewboyson/eagle.epf

heating/boiler.c@1:ccc66fdf858d, 2018-01-28 (annotated)

Committer:
andrewboyson
Date:
Sun Jan 28 14:41:12 2018 +0000
Revision:
1:ccc66fdf858d
Parent:
0:3c04f4b47041
Child:
5:82197a6997fd
Updated libraries

Who changed what in which revision?

UserRevisionLine numberNew contents of line
andrewboyson 0:3c04f4b47041 1 #include <string.h>
andrewboyson 0:3c04f4b47041 2 #include <stdint.h>
andrewboyson 0:3c04f4b47041 3 #include <stdbool.h>
andrewboyson 0:3c04f4b47041 4
andrewboyson 1:ccc66fdf858d 5 #include "defs.h"
andrewboyson 1:ccc66fdf858d 6 #include "tick.h"
andrewboyson 1:ccc66fdf858d 7 #include "ds18b20.h"
andrewboyson 1:ccc66fdf858d 8 #include "fram.h"
andrewboyson 0:3c04f4b47041 9
andrewboyson 0:3c04f4b47041 10 #define BOILER_PUMP_MASK 1UL << 4 // P2.4 == p22
andrewboyson 0:3c04f4b47041 11 #define BOILER_CALL_MASK 1UL << 5 // P2.5 == p21
andrewboyson 0:3c04f4b47041 12
andrewboyson 0:3c04f4b47041 13 static char tankRom[8]; static int iTankRom;
andrewboyson 0:3c04f4b47041 14 static char outputRom[8]; static int iOutputRom;
andrewboyson 0:3c04f4b47041 15 static char returnRom[8]; static int iReturnRom;
andrewboyson 0:3c04f4b47041 16
andrewboyson 0:3c04f4b47041 17
andrewboyson 0:3c04f4b47041 18 static int32_t tankSetPoint; static int iTankSetPoint;
andrewboyson 0:3c04f4b47041 19 static int32_t tankHysteresis; static int iTankHysteresis;
andrewboyson 0:3c04f4b47041 20 static int32_t runOnResidual; static int iRunOnResidual;
andrewboyson 0:3c04f4b47041 21 static int32_t runOnTime; static int iRunOnTime;
andrewboyson 0:3c04f4b47041 22
andrewboyson 0:3c04f4b47041 23 char* BoilerGetTankRom () { return tankRom; }
andrewboyson 0:3c04f4b47041 24 char* BoilerGetOutputRom () { return outputRom; }
andrewboyson 0:3c04f4b47041 25 char* BoilerGetReturnRom () { return returnRom; }
andrewboyson 0:3c04f4b47041 26 int BoilerGetTankSetPoint () { return (int) tankSetPoint; }
andrewboyson 0:3c04f4b47041 27 int BoilerGetTankHysteresis() { return (int) tankHysteresis; }
andrewboyson 0:3c04f4b47041 28 int BoilerGetRunOnResidual () { return (int) runOnResidual; }
andrewboyson 0:3c04f4b47041 29 int BoilerGetRunOnTime () { return (int) runOnTime; }
andrewboyson 0:3c04f4b47041 30
andrewboyson 0:3c04f4b47041 31 void BoilerSetTankRom (char* value) { memcpy(tankRom, value, 8); FramWrite(iTankRom, 8, tankRom ); }
andrewboyson 0:3c04f4b47041 32 void BoilerSetOutputRom (char* value) { memcpy(outputRom, value, 8); FramWrite(iOutputRom, 8, outputRom ); }
andrewboyson 0:3c04f4b47041 33 void BoilerSetReturnRom (char* value) { memcpy(returnRom, value, 8); FramWrite(iReturnRom, 8, returnRom ); }
andrewboyson 0:3c04f4b47041 34 void BoilerSetTankSetPoint (int value) { tankSetPoint = (int32_t)value; FramWrite(iTankSetPoint, 4, &tankSetPoint ); }
andrewboyson 0:3c04f4b47041 35 void BoilerSetTankHysteresis (int value) { tankHysteresis = (int32_t)value; FramWrite(iTankHysteresis, 4, &tankHysteresis ); }
andrewboyson 0:3c04f4b47041 36 void BoilerSetRunOnResidual (int value) { runOnResidual = (int32_t)value; FramWrite(iRunOnResidual, 4, &runOnResidual ); }
andrewboyson 0:3c04f4b47041 37 void BoilerSetRunOnTime (int value) { runOnTime = (int32_t)value; FramWrite(iRunOnTime, 4, &runOnTime ); }
andrewboyson 0:3c04f4b47041 38
andrewboyson 0:3c04f4b47041 39
andrewboyson 0:3c04f4b47041 40 int BoilerInit()
andrewboyson 0:3c04f4b47041 41 {
andrewboyson 0:3c04f4b47041 42 int address;
andrewboyson 0:3c04f4b47041 43 int32_t def4;
andrewboyson 0:3c04f4b47041 44 address = FramLoad( 8, tankRom, 0); if (address < 0) return -1; iTankRom = address;
andrewboyson 0:3c04f4b47041 45 address = FramLoad( 8, outputRom, 0); if (address < 0) return -1; iOutputRom = address;
andrewboyson 0:3c04f4b47041 46 address = FramLoad( 8, returnRom, 0); if (address < 0) return -1; iReturnRom = address;
andrewboyson 0:3c04f4b47041 47 def4 = 80; address = FramLoad( 4, &tankSetPoint, &def4); if (address < 0) return -1; iTankSetPoint = address;
andrewboyson 0:3c04f4b47041 48 def4 = 5; address = FramLoad( 4, &tankHysteresis, &def4); if (address < 0) return -1; iTankHysteresis = address;
andrewboyson 0:3c04f4b47041 49 def4 = 2; address = FramLoad( 4, &runOnResidual, &def4); if (address < 0) return -1; iRunOnResidual = address;
andrewboyson 0:3c04f4b47041 50 def4 = 360; address = FramLoad( 4, &runOnTime, &def4); if (address < 0) return -1; iRunOnTime = address;
andrewboyson 0:3c04f4b47041 51
andrewboyson 0:3c04f4b47041 52 LPC_GPIO2->FIODIR |= BOILER_PUMP_MASK; //Set the direction to 1 == output
andrewboyson 0:3c04f4b47041 53 LPC_GPIO2->FIODIR |= BOILER_CALL_MASK; //Set the direction to 1 == output
andrewboyson 0:3c04f4b47041 54
andrewboyson 0:3c04f4b47041 55 return 0;
andrewboyson 0:3c04f4b47041 56 }
andrewboyson 0:3c04f4b47041 57 bool BoilerPump = false;
andrewboyson 0:3c04f4b47041 58 bool BoilerCall = false;
andrewboyson 0:3c04f4b47041 59
andrewboyson 0:3c04f4b47041 60 void BoilerMain()
andrewboyson 0:3c04f4b47041 61 {
andrewboyson 0:3c04f4b47041 62 //Control boiler call
andrewboyson 0:3c04f4b47041 63 int tankTemp16ths = DS18B20ValueFromRom(tankRom);
andrewboyson 0:3c04f4b47041 64 if (DS18B20IsValidValue(tankTemp16ths)) //Ignore values which are likely to be wrong
andrewboyson 0:3c04f4b47041 65 {
andrewboyson 0:3c04f4b47041 66 int tankUpper16ths = tankSetPoint << 4;
andrewboyson 0:3c04f4b47041 67 int hysteresis16ths = tankHysteresis << 4;
andrewboyson 0:3c04f4b47041 68 int tankLower16ths = tankUpper16ths - hysteresis16ths;
andrewboyson 0:3c04f4b47041 69
andrewboyson 0:3c04f4b47041 70 if (tankTemp16ths >= tankUpper16ths) BoilerCall = false;
andrewboyson 0:3c04f4b47041 71 if (tankTemp16ths <= tankLower16ths) BoilerCall = true;
andrewboyson 0:3c04f4b47041 72 }
andrewboyson 0:3c04f4b47041 73 if (BoilerCall) LPC_GPIO2->FIOSET = BOILER_CALL_MASK;
andrewboyson 0:3c04f4b47041 74 else LPC_GPIO2->FIOCLR = BOILER_CALL_MASK;
andrewboyson 0:3c04f4b47041 75
andrewboyson 0:3c04f4b47041 76 //Control boiler circulation pump
andrewboyson 0:3c04f4b47041 77 int boilerOutput16ths = DS18B20ValueFromRom(outputRom);
andrewboyson 0:3c04f4b47041 78 int boilerReturn16ths = DS18B20ValueFromRom(returnRom);
andrewboyson 0:3c04f4b47041 79 int boilerResidual16ths = boilerOutput16ths - boilerReturn16ths;
andrewboyson 0:3c04f4b47041 80 int boilerTempsAreValid = DS18B20IsValidValue(boilerOutput16ths) && DS18B20IsValidValue(boilerReturn16ths);
andrewboyson 0:3c04f4b47041 81
andrewboyson 1:ccc66fdf858d 82 static int64_t offTicks;
andrewboyson 0:3c04f4b47041 83 if (BoilerCall)
andrewboyson 0:3c04f4b47041 84 {
andrewboyson 0:3c04f4b47041 85 BoilerPump = true;
andrewboyson 1:ccc66fdf858d 86 offTicks = Ticks();
andrewboyson 0:3c04f4b47041 87 }
andrewboyson 0:3c04f4b47041 88 else
andrewboyson 0:3c04f4b47041 89 {
andrewboyson 1:ccc66fdf858d 90 int secondsSinceBoilerOff = (Ticks() - offTicks) >> TICK_ONE_SECOND_SHIFT;
andrewboyson 0:3c04f4b47041 91 if (secondsSinceBoilerOff > runOnTime) BoilerPump = false;
andrewboyson 0:3c04f4b47041 92 if (boilerTempsAreValid)
andrewboyson 0:3c04f4b47041 93 {
andrewboyson 0:3c04f4b47041 94 int boilerStillSupplyingHeat = boilerResidual16ths > runOnResidual;
andrewboyson 0:3c04f4b47041 95 if (!boilerStillSupplyingHeat) BoilerPump = false;
andrewboyson 0:3c04f4b47041 96 }
andrewboyson 0:3c04f4b47041 97 }
andrewboyson 0:3c04f4b47041 98
andrewboyson 0:3c04f4b47041 99 if (BoilerPump) LPC_GPIO2->FIOSET = BOILER_PUMP_MASK;
andrewboyson 0:3c04f4b47041 100 else LPC_GPIO2->FIOCLR = BOILER_PUMP_MASK;
andrewboyson 0:3c04f4b47041 101
andrewboyson 0:3c04f4b47041 102 }