I have to read and write data from DS1682 chip using MSP430G2231. I have an application note from DS1682. I am not able to port the program to MSP430G2231 IAR workbench.They have used DS5000 microcontroller. How to declare the pins sda and scl? Plz help
#include <stdio.h> /* Prototypes for I/O functions */#include <msp430G2231.h> /* Register declarations for DS5000 *//************************* Global Variables *****************************//***************************** Defines *********************************/#define AOS 0x08#define AP 0x02#define RE 0x04#define ACK 0#define NACK 1#define ADD1682 0xd6 /* 2-wire base address (read) 11010111*/#define scl BIT0 /* 2-wire pin definitions */#define sda BIT1#define ALR BIT2 #define /*********************** Function Prototypes ****************************/unsigned char rbyte();void wbyte(unsigned char);void alarm();void disp_regs();void start2w();void stop2w();void writebyte2w(unsigned char);unsigned char read_byte(unsigned char);unsigned char readbyte2w(unsigned char);void readreg();void writereg();void start2w() /* ----------------------------------------------- */{sda=1; sda=1;scl=1; /* Initiate start condition */sda=0;}void stop2w() /* ----------------------------------------------- */{sda = 0; sda = 0; sda = 0; /* Initiate stop condition */scl = 1; scl = 1; scl = 1; sda = 1;}void writebyte2w(unsigned char d) /* ----- write 2-wire, current register ----- */{char i;scl = 0;for (i = 1; i <= 8; i++){sda = (d >> 7);scl = 1;d = d << 1;scl == 0;}sda == 1; /* Release the sda line */scl == 1;if (sda) printf("Ack bit missing %02X\n",(unsigned int)d);scl == 0;}unsigned char readbyte2w(unsigned char b) /* ------- read 2-wire, current register ------- */{char i;unsigned char d;sda = 1; /* Let go of sda line */scl = 0;for (i = 1; i <= 8; i++) /* read the msb first */{scl = 1;d = d << 1;d = d | (unsigned char)sda;scl = 0;}sda = b; /* Hold sda low for acknowledge */scl = 1;if(b == NACK) sda = 1; /* sda = 1 if next cycle is reset */scl = 0;sda = 1; /* Release the sda line */return d;}void writereg() /* ------------ single byte user write ------------ */{unsigned char add, dat;printf("\naddress (hex): "); /* Get Address */scanf("%c",&add);printf("\nDATA (hex): ");scanf("%c",&dat); start2w();writebyte2w(ADD1682);writebyte2w(add);writebyte2w(dat);stop2w();}void readreg() /* -------------- single byte user read -------------- */{unsigned char add;printf("\nEnter address (hex): "); /* Get Address */scanf("%c",&add);start2w();writebyte2w(ADD1682);writebyte2w(add);start2w();writebyte2w(ADD1682 | 1);printf("%2.x", readbyte2w(NACK) );stop2w();}void loop_read() /* ------------ loop reading alarm and tta registers -------------*/{long int tmp;unsigned char cnfg, altpl, altplm, altphm, altph, ttal_last, ttal, ttalm, ttahm, ttah, evntl, evnth;while(!RE){cnfg = read_byte(0); /* starts w/last address stored in register pointer */altpl = read_byte(1);altplm = read_byte(2);altphm = read_byte(3);altph = read_byte(4);ttal = read_byte(5);ttalm = read_byte(6);ttahm = read_byte(7);ttah = read_byte(8);evntl = read_byte(9);evnth = read_byte(0xa);if( (ttal & 0xfc) != (ttal_last & 0xfc) ) /* update display once per secondwhile event high */{printf("\rCnfg: %2.x", cnfg);tmp = ((long int) altph << 24) + ((long int) altphm << 16) + ((long int)altplm << 8) + (long int) altpl;tmp >>= 2;printf(" Alarm reg: %10ld sec ", tmp);tmp = ((long int) ttah << 24) + ((long int) ttahm << 16) + ((long int)ttalm << 8) + (long int) ttal;tmp >>= 2;printf("Event Time: %10ld sec ", tmp);printf("Event Count: %d", ((int) evnth << 8) + evntl);ttal_last = ttal;}}}void init() /* ----------- get setup and configure DUT ---------- */{/* Note: NO error checking is done on the user entries! */unsigned long int alrm; /* assumes 32 bit long int */unsigned char config,dat;printf("\nThis routine will initialize and reset the DS1682, after which");printf("\nno changes can be made. Continue? Y/N: ");scanf("%c", &dat);dat &= 0xdf; /* make upper case if not already */if(dat != 'Y')return; /* do not pass go, do not collect $200 */printf("\nEnter alarm time in whole seconds 0 to 4294967292 ");scanf("%ld", &alrm);alrm <<= 2;start2w();writebyte2w(ADD1682); /* write slave address + write */writebyte2w(0x00); /* write register address */writebyte2w(config);writebyte2w( (unsigned char) (alrm & 0xff) );writebyte2w( (unsigned char) ((alrm & 0xff00) >> 8) );writebyte2w( (unsigned char) ((alrm & 0xff0000) >> 16) );writebyte2w( (unsigned char) ((alrm & 0xff000000) >> 24) );stop2w();start2w();writebyte2w(ADD1682); /* write slave address + write */writebyte2w(0x0b); /* write register address */for(config = 1; config < 11; config++){printf("Enter User RAM data byte HEX %d ", config);scanf("%c", &dat);writebyte2w(dat);}stop2w();printf("\nLock User RAM? (Y/N): "); /* select memory lock options */scanf("%*c %c", &dat);if(dat == 'Y' || dat == 'y'){for(dat = 0; dat < 2; dat++) /* write reg 0x1f twice with 0xf0 data */{start2w();writebyte2w(ADD1682); /* write slave address + write */writebyte2w(0x1f); /* write register address */writebyte2w(0xf0); /* write data */stop2w();}} /* WMDF should now read back as a '1' */printf("\nLock Alarm, ETC & Event registers? (Y/N): ");scanf("%c", &dat);if(dat == 'Y' || dat == 'y'){for(dat = 0; dat < 2; dat++) /* write reg 0x1f twice with 0xf0 data */{start2w();writebyte2w(ADD1682); /* write slave address + write */writebyte2w(0x1e); /* write register address */writebyte2w(0xaa); /* write data */stop2w();}} /* WDF should now read back as a '1' */do /* now set up the alarm output options */{printf("\nAlarm output Pulse or Constant? (P/C): ");scanf("%c", &dat);switch(dat){case 'P': /* set AOS bit in configuration register to a '0' */case 'p': config = 0; break;case 'C': /* set AOS bit in configuration register to a '1' */case 'c': config = AOS; break;default: dat = 0;}} while(!dat);if(dat == 'C' || dat == 'c'){printf("\nAlarm Polarity Active High or Low? (H/L): ");scanf("%c", &dat);switch(dat){case 'H': /* set AP bit in configuration register to a '1' */case 'h': config |= AP; break;case 'L': /* set AP bit in configuration register to a '0' */case 'l': config &= (AP ^ 0xff); break;default: dat = 0;}} while(!dat);start2w();writebyte2w(ADD1682); /* write slave address + write */writebyte2w(0); /* write register address */writebyte2w(config + RE); /* write configuration data, enable reset */stop2w();/* note that it doesn't matter if there are data in the ETC and event counters.We don't care if EVENT is high or low, or if we've stored the alarm datain EEPROM. The reset command will transfer that data. */for(dat = 0; dat < 2; dat++) /* write reg 0x1f twice with 0xf0 data */{start2w();writebyte2w(ADD1682); /* write slave address + write */writebyte2w(0x1d); /* write register address */writebyte2w(0x55); /* write data */stop2w();}/* the eeprom will take tEW to finish, so we're depending upon the menu rountineand the user to take enough time for the write to finish, before we talkto the part again. a delay routine should be added here if we add anycode that could access the part before the eeprom write terminates */}void disp_regs() /* --------------displays all of the user registers ---------------- */{unsigned char cnfg, altpl, altplm, altphm, altph, ttal, ttalm, ttahm, ttah, evntl, evnth;cnfg = read_byte(0); /* starts w/last address stored in register pointer */altpl = read_byte(1);altplm = read_byte(2);altphm = read_byte(3);altph = read_byte(4);ttal = read_byte(5);ttalm = read_byte(6);ttahm = read_byte(7);ttah = read_byte(8);evntl = read_byte(9);evnth = read_byte(0xa);printf("\nCnfg: %02.X", cnfg);printf("\nAlrm Trip point: %02.X %02.X %02.X %02.X" ,altph,altphm,altplm,altpl);printf("\nTtl Time Acc: %02.X%02.X%02.X%02.X", ttah, ttahm, ttalm, ttal);printf("\nEvent Counter: %02.X%02.X", evnth, evntl);printf("\nUser RAM: ");for(cnfg = 0xb; cnfg < 0x15; cnfg++) printf("%02.X ", read_byte(cnfg) );}unsigned char read_byte(unsigned char reg_add) /* ---- read byte from address as entered ---- */{unsigned char dat;start2w();writebyte2w(ADD1682);writebyte2w(reg_add);start2w();writebyte2w(ADD1682 | 1);dat = readbyte2w(NACK);stop2w();return(dat);}void alarm() /* ---- monitor alarm output, read regs on change ---- */{/* routine assumes part is powered & ready for test mode. Assumes alarm is inactive on entry*/unsigned char inc;printf("\nAlarm Test:");printf("\nStart:");for(inc = 0; inc < 0x15; inc++){printf("% 2.x ", read_byte(inc) );}puts("");inc = ALR;while(inc == ALR)inc = ALR;printf("\nMatch :");for(inc = 0; inc < 0x15; inc++){printf("%2.x", read_byte(inc));}puts("");}main (void) /* ----------------------------------------------------- */{unsigned char M,M1;disp_regs(); /* read device every time code starts */while (1){printf("\nDS1682 \n");printf("R Read regs L Loop Read\n");printf("BR Byte Read BW Write Byte\n");printf("I initialize A Alarm monitor\n");printf("\nEnter Menu Selection:");M=getchar();printf("%c", M);switch(M){case 'A':case 'a': alarm(); break;case 'B':case 'b':printf("\nRead or Write:");M1 =getchar();printf("%c", M1);switch(M1){case 'R':case 'r': readreg(); break;case 'W':case 'w': writereg(); break;}break;case 'I':case 'i': init(); break;case 'L':case 'l': loop_read(); break;case 'R':case 'r': disp_regs(); break;}}}