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working External RTC BQ32000 interfacing to msp430 code

Nandish H S
Expert 1020 points

Other Parts Discussed in Thread: BQ32000

0447.BQ32000 with msp430.zip

Hi 

this is the working code for BQ32000 interfacing to msp430.

Regards

Nandish

  • Prodigy 20 points

    MainClockInit() statement inside your main() block is giving an error.

    The error is :
    unresolved symbol MainClockInit, first referenced in ./main.obj

    I'm new to I2C so I used your code and I have no idea how to correct this. Any help is appreciated.

  • in reply to Bhaskar Chakradhar
    Expert 1020 points

    Hi bhaskar,

    sorry i forgot to remove that line in my code and please  find the  below  code which is tested . `

    #include "MSP430.h"
    unsigned char sec, min, hour, month, year, date;
    #define SLA_ADR 0x68//slave address
    void BQ32000Init(void);
    void BQ32000ReadTime(unsigned char *datos);
    void USCIB0Init(void);
    void I2CStop(void);
    unsigned char I2CStartWrite(unsigned int slave, unsigned char firstdata);
    unsigned char I2CStartRead(unsigned int slave);
    unsigned char I2CWrite(unsigned char c);
    unsigned char I2CRead(void);
    int main( void )
    {   
       unsigned char datos[8];
       WDTCTL = WDTPW + WDTHOLD;
       
        BQ32000Init();
      __delay_cycles(250000);//250mseg
       
       
       while(1){
          
             BQ32000ReadTime(&datos[0]);
             sec=datos[0];
            min=datos[1];
            hour=datos[2];
            date=datos[4];
            month=datos[5];
            year=datos[6];
             
       }
    }
    void BQ32000Init(void)
    {
       USCIB0Init();
       I2CStartWrite(SLA_ADR,0x00);
       I2CWrite(0x30);//s  0
       I2CWrite(0x02);//m  1
       I2CWrite(0x10);//h  2
       I2CWrite(0x02);//day  3
       I2CWrite(0x11);//d  4
       I2CWrite(0x11);//mth   5
       I2CWrite(0x14);//y  6
       I2CWrite(0x10);//cotrol register  7
       I2CStop();
    }
    void BQ32000ReadTime(unsigned char *datos)
    {
       unsigned char aux;
       USCIB0Init();
       I2CStartWrite(SLA_ADR,0x00);
       I2CStartRead(SLA_ADR);
       for(aux = 0; aux < 7; aux++, datos++){//6
          *datos = I2CRead();
       }
       UCB0CTL1 |= UCTXNACK;
       I2CStop();
       *datos = I2CRead();
       __delay_cycles(15);//15
       I2CStop();
    }
    void USCIB0Init(void){
       P1SEL |= 0xC0;
       P1SEL2 |= 0xC0;
       UCB0CTL1 |= UCSWRST;
       UCB0CTL0 = UCMST+UCMODE_3+UCSYNC;
       UCB0CTL1 = UCSSEL_2+UCSWRST;
       UCB0BR0 = 10;
       UCB0BR1 = 0;
       UCB0I2COA = 0;
       UCB0I2CSA = 0;
       UCB0CTL1 &= ~UCSWRST;
    }
    void I2CStop(void)
    {
       while((UCB0STAT & BUSY)!= 0);
       UCB0CTL1 |= UCTXSTP;
    }
    unsigned char I2CStartWrite(unsigned int slave, unsigned char firstdata)
    {
       while((UCB0STAT & BUSY)!= 0);
       UCB0I2CSA = slave;
       UCB0CTL1 |= UCTR;                      // I2C TX
       UCB0CTL1 |= UCTXSTT;
       UCB0TXBUF = firstdata;
       while(!(IFG2 &UCB0TXIFG));
       if((UCB0STAT & UCNACKIFG)!=0){
          return 0;
       } else {
          return 1;
       }
    }
    unsigned char I2CStartRead(unsigned int slave)
    {
       while((UCB0STAT & BUSY)!= 0);
       UCB0I2CSA = slave;
       UCB0CTL1 &= ~UCTR;
       UCB0CTL1 |= UCTXSTT;
       while((UCB0CTL1 & UCTXSTT)!= 0);
       if((UCB0STAT & UCNACKIFG)!=0)
       {
          return 0;
       } else
       {
          return 1;
       }
    }
    unsigned char I2CWrite(unsigned char c)
    {
       while((UCB0STAT & BUSY)!= 0);
       UCB0TXBUF = c;
       while(!(IFG2 &UCB0TXIFG));
       if((UCB0STAT & UCNACKIFG)!=0)
       {
          return 0;
       } else
       {
          return 1;
       }
    }
    unsigned char I2CRead(void)
    {
       unsigned char data;
       while((UCB0STAT & BUSY)!= 0);
       while(!(IFG2 & UCB0RXIFG));
       data = UCB0RXBUF;
       return data;
    }
  • Prodigy 20 points

    I'm trying to interface RTC BQ32000 with MSP430  and i'm unable to find suitable circuitry for this purpose. Do you have a working circuit in mind?

    Thanks for the help!

  • in reply to Bhaskar Chakradhar
    Expert 1020 points
    share me your schematic and code file to my id nandish.sriram@serialsystem.com
  • in reply to Nandish H S
    Prodigy 10 points

    Nandish H S said:

    Hi bhaskar,

    sorry i forgot to remove that line in my code and please  find the  below  code which is tested . `

    #include "MSP430.h"
    unsigned char sec, min, hour, month, year, date;
    #define SLA_ADR 0x68//slave address
    void BQ32000Init(void);
    void BQ32000ReadTime(unsigned char *datos);
    void USCIB0Init(void);
    void I2CStop(void);
    unsigned char I2CStartWrite(unsigned int slave, unsigned char firstdata);
    unsigned char I2CStartRead(unsigned int slave);
    unsigned char I2CWrite(unsigned char c);
    unsigned char I2CRead(void);
    int main( void )
    {   
       unsigned char datos[8];
       WDTCTL = WDTPW + WDTHOLD;
       
        BQ32000Init();
      __delay_cycles(250000);//250mseg
       
       
       while(1){
          
             BQ32000ReadTime(&datos[0]);
             sec=datos[0];
            min=datos[1];
            hour=datos[2];
            date=datos[4];
            month=datos[5];
            year=datos[6];
             
       }
    }
    void BQ32000Init(void)
    {
       USCIB0Init();
       I2CStartWrite(SLA_ADR,0x00);
       I2CWrite(0x30);//s  0
       I2CWrite(0x02);//m  1
       I2CWrite(0x10);//h  2
       I2CWrite(0x02);//day  3
       I2CWrite(0x11);//d  4
       I2CWrite(0x11);//mth   5
       I2CWrite(0x14);//y  6
       I2CWrite(0x10);//cotrol register  7
       I2CStop();
    }
    void BQ32000ReadTime(unsigned char *datos)
    {
       unsigned char aux;
       USCIB0Init();
       I2CStartWrite(SLA_ADR,0x00);
       I2CStartRead(SLA_ADR);
       for(aux = 0; aux < 7; aux++, datos++){//6
          *datos = I2CRead();
       }
       UCB0CTL1 |= UCTXNACK;
       I2CStop();
       *datos = I2CRead();
       __delay_cycles(15);//15
       I2CStop();
    }
    void USCIB0Init(void){
       P1SEL |= 0xC0;
       P1SEL2 |= 0xC0;
       UCB0CTL1 |= UCSWRST;
       UCB0CTL0 = UCMST+UCMODE_3+UCSYNC;
       UCB0CTL1 = UCSSEL_2+UCSWRST;
       UCB0BR0 = 10;
       UCB0BR1 = 0;
       UCB0I2COA = 0;
       UCB0I2CSA = 0;
       UCB0CTL1 &= ~UCSWRST;
    }
    void I2CStop(void)
    {
       while((UCB0STAT & BUSY)!= 0);
       UCB0CTL1 |= UCTXSTP;
    }
    unsigned char I2CStartWrite(unsigned int slave, unsigned char firstdata)
    {
       while((UCB0STAT & BUSY)!= 0);
       UCB0I2CSA = slave;
       UCB0CTL1 |= UCTR;                      // I2C TX
       UCB0CTL1 |= UCTXSTT;
       UCB0TXBUF = firstdata;
       while(!(IFG2 &UCB0TXIFG));
       if((UCB0STAT & UCNACKIFG)!=0){
          return 0;
       } else {
          return 1;
       }
    }
    unsigned char I2CStartRead(unsigned int slave)
    {
       while((UCB0STAT & BUSY)!= 0);
       UCB0I2CSA = slave;
       UCB0CTL1 &= ~UCTR;
       UCB0CTL1 |= UCTXSTT;
       while((UCB0CTL1 & UCTXSTT)!= 0);
       if((UCB0STAT & UCNACKIFG)!=0)
       {
          return 0;
       } else
       {
          return 1;
       }
    }
    unsigned char I2CWrite(unsigned char c)
    {
       while((UCB0STAT & BUSY)!= 0);
       UCB0TXBUF = c;
       while(!(IFG2 &UCB0TXIFG));
       if((UCB0STAT & UCNACKIFG)!=0)
       {
          return 0;
       } else
       {
          return 1;
       }
    }
    unsigned char I2CRead(void)
    {
       unsigned char data;
       while((UCB0STAT & BUSY)!= 0);
       while(!(IFG2 & UCB0RXIFG));
       data = UCB0RXBUF;
       return data;
    }

    Nandish H S said:

    Hi bhaskar,

    sorry i forgot to remove that line in my code and please  find the  below  code which is tested . `

    #include "MSP430.h"
    unsigned char sec, min, hour, month, year, date;
    #define SLA_ADR 0x68//slave address
    void BQ32000Init(void);
    void BQ32000ReadTime(unsigned char *datos);
    void USCIB0Init(void);
    void I2CStop(void);
    unsigned char I2CStartWrite(unsigned int slave, unsigned char firstdata);
    unsigned char I2CStartRead(unsigned int slave);
    unsigned char I2CWrite(unsigned char c);
    unsigned char I2CRead(void);
    int main( void )
    {   
       unsigned char datos[8];
       WDTCTL = WDTPW + WDTHOLD;
       
        BQ32000Init();
      __delay_cycles(250000);//250mseg
       
       
       while(1){
          
             BQ32000ReadTime(&datos[0]);
             sec=datos[0];
            min=datos[1];
            hour=datos[2];
            date=datos[4];
            month=datos[5];
            year=datos[6];
             
       }
    }
    void BQ32000Init(void)
    {
       USCIB0Init();
       I2CStartWrite(SLA_ADR,0x00);
       I2CWrite(0x30);//s  0
       I2CWrite(0x02);//m  1
       I2CWrite(0x10);//h  2
       I2CWrite(0x02);//day  3
       I2CWrite(0x11);//d  4
       I2CWrite(0x11);//mth   5
       I2CWrite(0x14);//y  6
       I2CWrite(0x10);//cotrol register  7
       I2CStop();
    }
    void BQ32000ReadTime(unsigned char *datos)
    {
       unsigned char aux;
       USCIB0Init();
       I2CStartWrite(SLA_ADR,0x00);
       I2CStartRead(SLA_ADR);
       for(aux = 0; aux < 7; aux++, datos++){//6
          *datos = I2CRead();
       }
       UCB0CTL1 |= UCTXNACK;
       I2CStop();
       *datos = I2CRead();
       __delay_cycles(15);//15
       I2CStop();
    }
    void USCIB0Init(void){
       P1SEL |= 0xC0;
       P1SEL2 |= 0xC0;
       UCB0CTL1 |= UCSWRST;
       UCB0CTL0 = UCMST+UCMODE_3+UCSYNC;
       UCB0CTL1 = UCSSEL_2+UCSWRST;
       UCB0BR0 = 10;
       UCB0BR1 = 0;
       UCB0I2COA = 0;
       UCB0I2CSA = 0;
       UCB0CTL1 &= ~UCSWRST;
    }
    void I2CStop(void)
    {
       while((UCB0STAT & BUSY)!= 0);
       UCB0CTL1 |= UCTXSTP;
    }
    unsigned char I2CStartWrite(unsigned int slave, unsigned char firstdata)
    {
       while((UCB0STAT & BUSY)!= 0);
       UCB0I2CSA = slave;
       UCB0CTL1 |= UCTR;                      // I2C TX
       UCB0CTL1 |= UCTXSTT;
       UCB0TXBUF = firstdata;
       while(!(IFG2 &UCB0TXIFG));
       if((UCB0STAT & UCNACKIFG)!=0){
          return 0;
       } else {
          return 1;
       }
    }
    unsigned char I2CStartRead(unsigned int slave)
    {
       while((UCB0STAT & BUSY)!= 0);
       UCB0I2CSA = slave;
       UCB0CTL1 &= ~UCTR;
       UCB0CTL1 |= UCTXSTT;
       while((UCB0CTL1 & UCTXSTT)!= 0);
       if((UCB0STAT & UCNACKIFG)!=0)
       {
          return 0;
       } else
       {
          return 1;
       }
    }
    unsigned char I2CWrite(unsigned char c)
    {
       while((UCB0STAT & BUSY)!= 0);
       UCB0TXBUF = c;
       while(!(IFG2 &UCB0TXIFG));
       if((UCB0STAT & UCNACKIFG)!=0)
       {
          return 0;
       } else
       {
          return 1;
       }
    }
    unsigned char I2CRead(void)
    {
       unsigned char data;
       while((UCB0STAT & BUSY)!= 0);
       while(!(IFG2 & UCB0RXIFG));
       data = UCB0RXBUF;
       return data;
    }

    Nandish H S said:

    Hi bhaskar,

    sorry i forgot to remove that line in my code and please  find the  below  code which is tested . `

    #include "MSP430.h"
    unsigned char sec, min, hour, month, year, date;
    #define SLA_ADR 0x68//slave address
    void BQ32000Init(void);
    void BQ32000ReadTime(unsigned char *datos);
    void USCIB0Init(void);
    void I2CStop(void);
    unsigned char I2CStartWrite(unsigned int slave, unsigned char firstdata);
    unsigned char I2CStartRead(unsigned int slave);
    unsigned char I2CWrite(unsigned char c);
    unsigned char I2CRead(void);
    int main( void )
    {   
       unsigned char datos[8];
       WDTCTL = WDTPW + WDTHOLD;
       
        BQ32000Init();
      __delay_cycles(250000);//250mseg
       
       
       while(1){
          
             BQ32000ReadTime(&datos[0]);
             sec=datos[0];
            min=datos[1];
            hour=datos[2];
            date=datos[4];
            month=datos[5];
            year=datos[6];
             
       }
    }
    void BQ32000Init(void)
    {
       USCIB0Init();
       I2CStartWrite(SLA_ADR,0x00);
       I2CWrite(0x30);//s  0
       I2CWrite(0x02);//m  1
       I2CWrite(0x10);//h  2
       I2CWrite(0x02);//day  3
       I2CWrite(0x11);//d  4
       I2CWrite(0x11);//mth   5
       I2CWrite(0x14);//y  6
       I2CWrite(0x10);//cotrol register  7
       I2CStop();
    }
    void BQ32000ReadTime(unsigned char *datos)
    {
       unsigned char aux;
       USCIB0Init();
       I2CStartWrite(SLA_ADR,0x00);
       I2CStartRead(SLA_ADR);
       for(aux = 0; aux < 7; aux++, datos++){//6
          *datos = I2CRead();
       }
       UCB0CTL1 |= UCTXNACK;
       I2CStop();
       *datos = I2CRead();
       __delay_cycles(15);//15
       I2CStop();
    }
    void USCIB0Init(void){
       P1SEL |= 0xC0;
       P1SEL2 |= 0xC0;
       UCB0CTL1 |= UCSWRST;
       UCB0CTL0 = UCMST+UCMODE_3+UCSYNC;
       UCB0CTL1 = UCSSEL_2+UCSWRST;
       UCB0BR0 = 10;
       UCB0BR1 = 0;
       UCB0I2COA = 0;
       UCB0I2CSA = 0;
       UCB0CTL1 &= ~UCSWRST;
    }
    void I2CStop(void)
    {
       while((UCB0STAT & BUSY)!= 0);
       UCB0CTL1 |= UCTXSTP;
    }
    unsigned char I2CStartWrite(unsigned int slave, unsigned char firstdata)
    {
       while((UCB0STAT & BUSY)!= 0);
       UCB0I2CSA = slave;
       UCB0CTL1 |= UCTR;                      // I2C TX
       UCB0CTL1 |= UCTXSTT;
       UCB0TXBUF = firstdata;
       while(!(IFG2 &UCB0TXIFG));
       if((UCB0STAT & UCNACKIFG)!=0){
          return 0;
       } else {
          return 1;
       }
    }
    unsigned char I2CStartRead(unsigned int slave)
    {
       while((UCB0STAT & BUSY)!= 0);
       UCB0I2CSA = slave;
       UCB0CTL1 &= ~UCTR;
       UCB0CTL1 |= UCTXSTT;
       while((UCB0CTL1 & UCTXSTT)!= 0);
       if((UCB0STAT & UCNACKIFG)!=0)
       {
          return 0;
       } else
       {
          return 1;
       }
    }
    unsigned char I2CWrite(unsigned char c)
    {
       while((UCB0STAT & BUSY)!= 0);
       UCB0TXBUF = c;
       while(!(IFG2 &UCB0TXIFG));
       if((UCB0STAT & UCNACKIFG)!=0)
       {
          return 0;
       } else
       {
          return 1;
       }
    }
    unsigned char I2CRead(void)
    {
       unsigned char data;
       while((UCB0STAT & BUSY)!= 0);
       while(!(IFG2 & UCB0RXIFG));
       data = UCB0RXBUF;
       return data;
    }

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