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

fram/fram.c@105:1899f7ed17ec, 2021-02-23 (annotated)

Committer:
andrewboyson
Date:
Tue Feb 23 20:35:07 2021 +0000
Revision:
105:1899f7ed17ec
Parent:
76:3ef2a46c8b1e 
Added ability to set the minimum flow rate and removed the correction to delta T relative to speed. Adding the round circuit time and linked to speed. Next task is to linearize the flow.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
andrewboyson 0:3c04f4b47041 1 #include <string.h>
andrewboyson 0:3c04f4b47041 2 #include <stdbool.h>
andrewboyson 0:3c04f4b47041 3
andrewboyson 0:3c04f4b47041 4 #include "spi.h"
andrewboyson 0:3c04f4b47041 5 #include "log.h"
andrewboyson 0:3c04f4b47041 6 #include "fram.h"
andrewboyson 0:3c04f4b47041 7
andrewboyson 0:3c04f4b47041 8 #define WREN 0x06 // Set Write Enable Latch 0000 0110B
andrewboyson 0:3c04f4b47041 9 #define WRDI 0x04 // Reset Write Enable Latch 0000 0100B
andrewboyson 0:3c04f4b47041 10 #define RDSR 0x05 // Read Status Register 0000 0101B
andrewboyson 0:3c04f4b47041 11 #define WRSR 0x01 // Write Status Register 0000 0001B
andrewboyson 0:3c04f4b47041 12 #define READ 0x03 // Read Memory Code 0000 0011B
andrewboyson 0:3c04f4b47041 13 #define WRITE 0x02 // Write Memory Code 0000 0010B
andrewboyson 0:3c04f4b47041 14 #define RDID 0x9F // Read Device ID 1001 1111B
andrewboyson 0:3c04f4b47041 15
andrewboyson 0:3c04f4b47041 16 #define FRAM_ID 0x047f0302
andrewboyson 0:3c04f4b47041 17 #define FRAM_MAGIC 42 //Magic number to show that the FRAM has been intialised
andrewboyson 0:3c04f4b47041 18
andrewboyson 0:3c04f4b47041 19 bool FramEmpty; //Set in FramInit
andrewboyson 0:3c04f4b47041 20 int FramUsed; //Initialised in FramInit and used by FramAllocate to remember the next available location
andrewboyson 0:3c04f4b47041 21
andrewboyson 0:3c04f4b47041 22 int FramAllocate(int size) //Allocates a number of bytes in FRAM
andrewboyson 0:3c04f4b47041 23 {
andrewboyson 0:3c04f4b47041 24 int start = FramUsed;
andrewboyson 0:3c04f4b47041 25 int used = FramUsed + size;
andrewboyson 0:3c04f4b47041 26 if (used > FRAM_SIZE - 1)
andrewboyson 0:3c04f4b47041 27 {
andrewboyson 0:3c04f4b47041 28 Log("FramAllocate - No more room in FRAM\r\n");
andrewboyson 0:3c04f4b47041 29 return -1;
andrewboyson 0:3c04f4b47041 30 }
andrewboyson 0:3c04f4b47041 31 FramUsed = used;
andrewboyson 0:3c04f4b47041 32 return start;
andrewboyson 0:3c04f4b47041 33 }
andrewboyson 0:3c04f4b47041 34 int FramInit()
andrewboyson 0:3c04f4b47041 35 {
andrewboyson 0:3c04f4b47041 36 //Configure SPI
andrewboyson 0:3c04f4b47041 37 SpiInit();
andrewboyson 0:3c04f4b47041 38
andrewboyson 0:3c04f4b47041 39 //Check if the FRAM is connected and working properly
andrewboyson 0:3c04f4b47041 40 SpiChipSelect(0);
andrewboyson 0:3c04f4b47041 41 SpiTransfer(RDID);
andrewboyson 0:3c04f4b47041 42 int id = 0;
andrewboyson 0:3c04f4b47041 43 id = (id << 8) + SpiTransfer(0);
andrewboyson 0:3c04f4b47041 44 id = (id << 8) + SpiTransfer(0);
andrewboyson 0:3c04f4b47041 45 id = (id << 8) + SpiTransfer(0);
andrewboyson 0:3c04f4b47041 46 id = (id << 8) + SpiTransfer(0);
andrewboyson 0:3c04f4b47041 47 SpiChipSelect(1);
andrewboyson 0:3c04f4b47041 48 if (id != FRAM_ID)
andrewboyson 0:3c04f4b47041 49 {
andrewboyson 0:3c04f4b47041 50 LogF("FramInit - Expected FRAM id %08x but got %08x\r\n", FRAM_ID, id);
andrewboyson 0:3c04f4b47041 51 return -1;
andrewboyson 0:3c04f4b47041 52 }
andrewboyson 0:3c04f4b47041 53
andrewboyson 0:3c04f4b47041 54 //Check the first byte to see if the FRAM is initialised and zero if not
andrewboyson 0:3c04f4b47041 55 SpiChipSelect(0);
andrewboyson 0:3c04f4b47041 56 SpiTransfer(READ);
andrewboyson 0:3c04f4b47041 57 SpiTransfer(0);
andrewboyson 0:3c04f4b47041 58 SpiTransfer(0);
andrewboyson 0:3c04f4b47041 59 char magic = SpiTransfer(0);
andrewboyson 0:3c04f4b47041 60 SpiChipSelect(1);
andrewboyson 0:3c04f4b47041 61 FramEmpty = magic != FRAM_MAGIC;
andrewboyson 0:3c04f4b47041 62 if (FramEmpty)
andrewboyson 0:3c04f4b47041 63 {
andrewboyson 0:3c04f4b47041 64 LogF("FramInit - Byte 0 value %d is not the magic value %d so initialising FRAM to zero\r\n", magic, FRAM_MAGIC);
andrewboyson 0:3c04f4b47041 65 SpiChipSelect(0);
andrewboyson 0:3c04f4b47041 66 SpiTransfer(WREN);
andrewboyson 0:3c04f4b47041 67 SpiChipSelect(1); SpiChipSelect(1); SpiChipSelect(1); SpiChipSelect(1); SpiChipSelect(1); SpiChipSelect(1);
andrewboyson 0:3c04f4b47041 68 SpiChipSelect(0);
andrewboyson 0:3c04f4b47041 69 SpiTransfer(WRITE);
andrewboyson 0:3c04f4b47041 70 SpiTransfer(0);
andrewboyson 0:3c04f4b47041 71 SpiTransfer(0);
andrewboyson 0:3c04f4b47041 72 SpiTransfer(FRAM_MAGIC); //Set the magic number in byte 0
andrewboyson 0:3c04f4b47041 73 for(int i = 1; i < FRAM_SIZE; i++) SpiTransfer(0); //Zero all other locations
andrewboyson 0:3c04f4b47041 74 SpiChipSelect(1);
andrewboyson 0:3c04f4b47041 75 }
andrewboyson 0:3c04f4b47041 76 FramUsed = 1; //Set the next available location to one past the byte used for the magic number
andrewboyson 0:3c04f4b47041 77 return 0;
andrewboyson 0:3c04f4b47041 78 }
andrewboyson 0:3c04f4b47041 79 void FramWrite(int address, int len, void* pVoid)
andrewboyson 0:3c04f4b47041 80 {
andrewboyson 0:3c04f4b47041 81 if (address + len > FRAM_SIZE - 1 || address < 0)
andrewboyson 0:3c04f4b47041 82 {
andrewboyson 0:3c04f4b47041 83 Log("FramWrite - Invalid FRAM address\r\n");
andrewboyson 0:3c04f4b47041 84 return;
andrewboyson 0:3c04f4b47041 85 }
andrewboyson 0:3c04f4b47041 86 SpiChipSelect(0);
andrewboyson 0:3c04f4b47041 87 SpiTransfer(WREN);
andrewboyson 0:3c04f4b47041 88 SpiChipSelect(1); SpiChipSelect(1); SpiChipSelect(1); SpiChipSelect(1); SpiChipSelect(1); SpiChipSelect(1); //Deselect must be at least 60ns. One operation at 96MHz is about 10ns
andrewboyson 0:3c04f4b47041 89 SpiChipSelect(0);
andrewboyson 0:3c04f4b47041 90 SpiTransfer(WRITE);
andrewboyson 0:3c04f4b47041 91 SpiTransfer(address >> 8);
andrewboyson 0:3c04f4b47041 92 SpiTransfer(address & 0xFF);
andrewboyson 0:3c04f4b47041 93 char* p = (char*)pVoid;
andrewboyson 0:3c04f4b47041 94 for (int i = 0; i < len; i++) SpiTransfer(*p++);
andrewboyson 0:3c04f4b47041 95 SpiChipSelect(1);
andrewboyson 0:3c04f4b47041 96 }
andrewboyson 0:3c04f4b47041 97 void FramRead(int address, int len, void* pVoid)
andrewboyson 0:3c04f4b47041 98 {
andrewboyson 0:3c04f4b47041 99 if (address + len > FRAM_SIZE - 1 || address < 0)
andrewboyson 0:3c04f4b47041 100 {
andrewboyson 0:3c04f4b47041 101 Log("FramRead - Invalid FRAM address\r\n");
andrewboyson 0:3c04f4b47041 102 return;
andrewboyson 0:3c04f4b47041 103 }
andrewboyson 0:3c04f4b47041 104 SpiChipSelect(0);
andrewboyson 0:3c04f4b47041 105 SpiTransfer(READ);
andrewboyson 0:3c04f4b47041 106 SpiTransfer(address >> 8);
andrewboyson 0:3c04f4b47041 107 SpiTransfer(address & 0xFF);
andrewboyson 0:3c04f4b47041 108 char* p = (char*)pVoid;
andrewboyson 0:3c04f4b47041 109 for (int i = 0; i < len; i++) *p++ = SpiTransfer(0);
andrewboyson 0:3c04f4b47041 110 SpiChipSelect(1);
andrewboyson 0:3c04f4b47041 111 }
andrewboyson 0:3c04f4b47041 112
andrewboyson 0:3c04f4b47041 113 int FramLoad(int len, void* pValue, void* pDefault)
andrewboyson 0:3c04f4b47041 114 {
andrewboyson 0:3c04f4b47041 115 int address = FramAllocate(len);
andrewboyson 0:3c04f4b47041 116 if (address >= 0)
andrewboyson 0:3c04f4b47041 117 {
andrewboyson 0:3c04f4b47041 118 if (FramEmpty)
andrewboyson 0:3c04f4b47041 119 {
andrewboyson 0:3c04f4b47041 120 if (pDefault)
andrewboyson 0:3c04f4b47041 121 {
andrewboyson 0:3c04f4b47041 122 int defaultHasContent = 0;
andrewboyson 0:3c04f4b47041 123 char* pFrom = (char*)pDefault;
andrewboyson 0:3c04f4b47041 124 char* pTo = (char*)pValue;
andrewboyson 76:3ef2a46c8b1e 125 for (int i = 0; i < len; i++)
andrewboyson 0:3c04f4b47041 126 {
andrewboyson 0:3c04f4b47041 127 if (*pFrom) defaultHasContent = 1;
andrewboyson 0:3c04f4b47041 128 *pTo++ = *pFrom++;
andrewboyson 0:3c04f4b47041 129 }
andrewboyson 0:3c04f4b47041 130 if (defaultHasContent) FramWrite(address, len, pValue);
andrewboyson 0:3c04f4b47041 131 }
andrewboyson 0:3c04f4b47041 132 else //pDefault is NULL so zero the setting
andrewboyson 0:3c04f4b47041 133 {
andrewboyson 0:3c04f4b47041 134 memset(pValue, 0, len);
andrewboyson 0:3c04f4b47041 135 }
andrewboyson 0:3c04f4b47041 136 }
andrewboyson 0:3c04f4b47041 137 else
andrewboyson 0:3c04f4b47041 138 {
andrewboyson 0:3c04f4b47041 139 FramRead(address, len, pValue);
andrewboyson 0:3c04f4b47041 140 }
andrewboyson 0:3c04f4b47041 141 }
andrewboyson 0:3c04f4b47041 142 return address;
andrewboyson 0:3c04f4b47041 143 }