Georgios Karadimitris
Library to interface with 1-wire through the DS2480B
Dependents: DS2480B_1_Wire_Master
Diff: DS2480B.cpp
- Revision:
- 0:07f0cd3758fa
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/DS2480B.cpp Mon Aug 29 14:22:20 2016 +0000
@@ -0,0 +1,362 @@
+#include "mbed.h"
+#include "DS2480B.h"
+
+#define Reset 0xC1
+#define Pullup 0x3B
+#define DataMode 0xE1
+#define CommandMode 0xE3
+#define ConvertT 0x44
+#define PullupArm 0xEF
+#define PullupDisarm 0xED
+#define PulseTerminate 0xF1
+#define PullupDisarm 0xED
+#define ReadScratchpad 0xBE
+#define SkipROM 0xCC
+#define MatchROM 0x55
+
+Serial serial(p9, p10);
+
+int DS1920[8] = {0x10, 0x7A, 0xA8, 0x92, 0x02, 0x08, 0x00, 0x7E};
+
+void DS2480B::mreset(void){
+ serial.send_break();
+ serial.putc(0xC1);
+}
+
+int DS2480B::reset(void)
+{
+ serial.putc(0xC1);
+ result = serial.getc();
+// printf("reset = %X \n \r", result); DEBUGGING
+
+ if(result == 0xCD){
+ return 1;
+ }
+ else{
+ mreset();
+ return 0;
+ }
+}
+
+//for commands that the ds2480b returns nothing over the UART
+void DS2480B::Mode(int command)
+{
+ serial.putc(command);
+}
+
+//for commands that the ds2480b returns a character over the UART
+int DS2480B::Command(int command)
+{
+ serial.putc(command);
+ result = serial.getc();
+// printf("sent = %X\t received = %X \n \r", command, result); DEBUGGING
+
+ return result;
+}
+
+
+//Search Accelerator algorithm
+void DS2480B::Search(int searchmode) //search ROM or Alarm Search command
+{
+ hdb = 0; //reset highest discrepancy bit found
+ last_hdb = 0; //last discrepancy bit
+
+ index = 0; //index of array for saving device's addresses
+
+
+ //clear array where current devices are being stored
+ int b = sizeof(romstorage)/ sizeof(uint64_t);
+ for(int i=0; i<b; i++){
+ romstorage[i] = 0;
+ }
+
+
+ //Reset pulse
+ if(reset()){
+
+
+ //set data mode
+ Mode(0xE1);
+
+ //search rom/alert search
+ Command(searchmode);
+
+ //set mode command
+ Mode(0xE3);
+
+ //search accelerator on
+ Mode(0xB1);
+
+ //set data mode
+ Mode(0xE1);
+
+ //First search data
+ for(int i=0; i<16; i++){
+ serial.putc(0x00);
+ }
+
+ //read found ROM code
+ for(int i=0; i<16; i++){
+ ROM[i] = serial.getc();
+ }
+
+ //command mode
+ Mode(0xE3);
+
+ //search accelerator off
+ Mode(0xA1);
+
+ reset();
+ getROM();
+ }
+
+ while(1)
+ {
+ bool flag(false); //flag to break nested loops
+ bool last(false); //flag signifying last device found
+
+ for(int i=15; i>-1; i--) //Run through obtained ROM bytes
+ {
+ last_hdb = hdb;
+
+ mask = 0x40; // mask for bits detection
+
+ //run discrepancy bits ( 1st, 3rd, 5th, 7th in byte)
+ for(int j=7; j>0; j=j-2)
+ {
+ if((mask & ROM[i]) != 0) //check for discrepancy
+ {
+ mask = mask << 1; // move from discrepancy to pattern bits
+ ROM[i] = (ROM[i] | mask); //set pattern
+ mask = 0xFF >> (7-j);
+ ROM[i] = ROM[i] & mask;
+
+ hdb = (((i) * j)+j);
+ if(hdb == last_hdb){
+ flag = true;
+ last = true;
+ break;
+ }
+
+// DEBUGGING printf("discrepancy flag at byte %d, bit %d\n\r", i, j);
+
+ int dbyte = i;
+ for(int k=dbyte+1; i<16; i++){
+ ROM[k] = 0;
+ }
+
+ flag = true;
+ break;
+ }
+ if(flag == true)
+ {
+ break;
+ }
+ mask = mask >> 2;
+ }
+
+ if(flag == true)
+ {
+ break;
+ }
+ }
+
+ if(flag == false)
+ {
+ break;
+ }
+
+ if (last == true)
+ {
+ break;
+ }
+
+ //Reset pulse
+ if(reset()){
+
+ //set data mode
+ Mode(0xE1);
+
+ //search rom
+ Command(0xF0);
+
+ //set mode command
+ Mode(0xE3);
+
+ //search accelerator on
+ Mode(0xB1);
+
+ //set data mode
+ Mode(0xE1);
+
+// insert previous rom code with search path set
+ for(int i=0; i<16; i++){
+ serial.putc(ROM[i]);
+ }
+
+ for(int i=0; i<16; i++){
+ ROM[i] = serial.getc();
+ // printf("rom %X \t", ROM[i]); Debugging
+ }
+
+ //command mode
+ Mode(0xE3);
+
+ //search accelerator off
+ Mode(0xA1);
+
+ //Reset
+ reset();
+ getROM();
+ }
+ }
+}
+
+// code to compile the bytes of the rom address and determine the type of device connected
+void DS2480B::getROM(void)
+{
+ rom = 0;
+ for(int i=14; i>-1; i=i-2){
+ byte = 0; //variable to store the byte value
+ mask = 2;
+
+ //use the mask to get the LS nibble
+ for(int j=1; j<5; j=j++){
+ temp = mask & ROM[i];
+ temp = temp >> j;
+ byte = byte + temp;
+ mask = mask << 2;
+ }
+
+ mask = 2;
+
+ //use the mask to get the MS nibble
+ for(int j=3; j>-1; j=j--){
+ temp = mask & ROM[i+1];
+ temp = temp << j;
+ byte = byte + temp;
+ mask = mask << 2;
+ }
+
+ rom = ((rom >> i * 4) + byte) << i * 4;
+
+// printf("byte = %X \t", byte); DEBUGGING
+
+
+ romstorage[index] = rom;
+
+// printf("rom address = %llX\n", romstorage[index]); DEBUGGING
+ index++;
+}
+}
+
+//**************************************************DS1920*******************************************\\
+
+float DS2480B::AcquireTemp(uint64_t address){
+ if(reset()){
+ //set data mode
+ Mode(DataMode);
+
+ //MatchRom
+ Command(MatchROM);
+
+ for(int i=0; i<8; i++){
+ //use mask to send rom byte-by-byte lsb first.
+ Command((address >> (i*8)) & 0xFF);
+ }
+
+
+ //Read scratchpad
+ Command(ReadScratchpad);
+
+ for(int i=0; i<9; i++){
+ serial.putc(0xFF);
+ scratchpad[i] = serial.getc();
+ }
+
+ temperature = scratchpad[0]/2;
+
+ if(scratchpad[1] == 0xFF)
+ {
+ temperature = temperature * -1;
+ }
+
+// printf("temperature = %f \n", temperature); DEBUGGING
+
+ //set mode command
+ Mode(CommandMode);
+ reset();
+ }
+ return temperature;
+}
+
+void DS2480B::ConvertTemp(void){
+ //set strong pullup duration
+ Command(Pullup);
+
+ //Reset pulse
+ if(reset()){
+
+ //set data mode
+ Mode(DataMode);
+
+ //skip rom
+ Command(SkipROM);
+
+ //set mode command
+ Mode(CommandMode);
+
+ //arm strong pullup
+ Mode(PullupArm);
+
+ //terminate pulse
+ Command(PulseTerminate);
+
+ //set data mode
+ Mode(DataMode);
+
+ //convert Temp
+ Command(ConvertT);
+
+ serial.getc();
+
+ //set mode command
+ Mode(CommandMode);
+
+ //disarm strong pullup
+ Mode(PullupDisarm);
+
+ //terminate pulse
+ Command(PulseTerminate); // to clear rx buffer of lpc1768
+ reset();
+ }
+}
+
+int DS2480B::Checkdevices(void){
+ int devices; // determine number of devices connected to the master
+ int type;
+ ds1920no = 0; //number of temperature sensors
+ ds1920first = 0;//position of 1st ds1920 in array
+ ds1990no = 0; //number of ID tags
+ ds1990first = 0; //position of 1st ds1990 in array
+ for(int i=0; i<2000; i++){
+ devices = devices++;
+ type = romstorage[i] & 0xFF; //check family byte
+
+ //count ds1920 devices
+ if(type == 0x10){
+ if(ds1920no == 0){
+ ds1920first = i;
+ }
+ ds1920no = ds1920no + 1;
+ }
+
+ if(type == 0x01){
+ if(ds1990no == 0){
+ ds1990first = i;
+ }
+ ds1920no = ds1920no + 1;
+ }
+ }
+ return devices;
+}
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