i2c.lst

lcd interface code for lpc214x series micro controllers

ARM COMPILER V0.07,  i2c                                                                   26/11/04  11:06:09  PAGE 1   


ARM COMPILER V0.07, COMPILATION OF MODULE i2c
OBJECT MODULE PLACED IN i2c.OBJ
COMPILER INVOKED BY: C:\KEIL\ARM\BIN\CA.EXE i2c.c TABS(4) 

stmt  level    source

    1          /**********************/
    2          /*i2c.c               */
    3          /*Pierre Seguin       */
    4          /*[e-mail] */
    5          /**********************/
    6          
    7          
    8          #include "LPC210x.h"
    9          #include "i2c.h"
   10          
   11          
   12          #define I2C_ERROR 1                           // these are the values that are stored in i2c_status
   13          #define I2C_OK 2                              // after reading or writing a byte and during an I2C operat
             -ion
   14          #define I2C_BUSY 0
   15          #define EEPROM_ADDR 0xA0
   16          
   17          unsigned char mask[] = {0xA8, 0x1F, 0x7F, 0x7F, 0x3F, 0x3F, 0x07, 0x1F,
   18                                  0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
   19                                                    // mask values for registers
   20          
   21          
   22          void InitI2C(void)
   23          {
   24   1          
   25   1          I2C_I2CONCLR = 0xFF; 
   26   1      
   27   1          //  Set pinouts as scl and sda
   28   1          PINSEL0  |= 0x50;
   29   1          PINSEL0  &= (uint32_t)0xFFFFFF5F;
   30   1          
   31   1          I2C_I2SCLL=60;  //speed at 375Khz for a VPB Clock Divider  = 1
   32   1          I2C_I2SCLH=70;
   33   1          I2C_I2CONSET = 0x40; //Active Master Mode on I2C bus
   34   1      }
   35          
   36          
   37          void SendSlaveAdress(uint8_t Addr_S)
   38          {   
   39   1          if(!(Addr_S&0x01)) //test if it's a master adress
   40   1          {
   41   2              //while(I2C_I2STAT!=0xF8);  
   42   2              I2C_I2CONSET = STA;
   43   2              while(I2C_I2STAT!=0x08);    //Set and wait the start        
   44   2              I2C_I2DAT    = Addr_S; // Charge slave Address
   45   2              I2C_I2CONCLR = SIC|STAC; // Clear i2c interrupt bit to send the data    
   46   2              while(I2C_I2STAT!=0x18&&!(I2C_I2CONSET&SI));    //wait the ACK      
   47   2          }
   48   1          else            //it's a slave adress
   49   1          {
   50   2              I2C_I2CONSET = STA;
   51   2              I2C_I2CONCLR = SIC;
   52   2              while(I2C_I2STAT!=0x10&&!(I2C_I2CONSET&SI));    //Set and wait the start        
   53   2              I2C_I2DAT    = Addr_S; // Charge slave Address  
   54   2              I2C_I2CONCLR = SIC|STAC; // Clear i2c interrupt bit to send the data    
   55   2              while(I2C_I2STAT!=0x40&&!(I2C_I2CONSET&SI));    //wait the ACK
   56   2          }
   57   1      }
   58          
ARM COMPILER V0.07,  i2c                                                                   26/11/04  11:06:09  PAGE 2   

   59          
   60          uint8_t ReadOnI2C(void)
   61          {
   62   1          I2C_I2CONCLR = SIC;                          //ACK from the master
   63   1          while(I2C_I2STAT!=0x50&&!(I2C_I2CONSET&SI)); //wait the data 
   64   1          // Read the data...  
   65   1          return I2C_I2DAT;
   66   1      }
   67          
   68          
   69          
   70          void WriteOnI2C(uint8_t Data)
   71          {
   72   1          I2C_I2DAT    = Data; // Charge Data 
   73   1          I2C_I2CONCLR = SIC; // Clear i2c interrupt bit to send the data     
   74   1          while(I2C_I2STAT!=0x28&&!(I2C_I2CONSET&SI));    //wait the ACK
   75   1      }
   76          
   77          uint8_t WriteRTC(uint8_t Addr,uint8_t Data)
   78          {   
   79   1          SendSlaveAdress(EEPROM_ADDR);           //Send the Eeprom Adress    
   80   1          WriteOnI2C(Addr);   //Send Addr 
   81   1          WriteOnI2C(chartobcd(Data));                        //Send Data 
   82   1          STOPI2C 
   83   1      }
   84          
   85          
   86          uint8_t ReadRTC(uint8_t Addr, uint8_t maskoff)
   87          {
   88   1          uint8_t tmp;
   89   1      
   90   1          SendSlaveAdress(EEPROM_ADDR);//Send the Eeprom Adress   
   91   1          WriteOnI2C(Addr);   //Send Addr 
   92   1          SendSlaveAdress(EEPROM_ADDR|1);     
   93   1          tmp=ReadOnI2C();
   94   1          if (maskoff) tmp &= mask[Addr];  // mask result if required
   95   1          STOPI2C
   96   1      //  return bcdtochar(tmp);        // convert to decimal and return result
   97   1          return tmp;
   98   1      }
   99          
  100          
  101          
  102          
  103          
  104          
  105          // function chartobcd
  106          // converts a decimal value to the BCD equivalent
  107          // decimal values must be stored in the Real Time Clock in BCD format
  108          // passed is the decimal value to convert
  109          // returned is the BCD equivalent
  110          unsigned char chartobcd(unsigned char n)
  111          {
  112   1        return ((n / 10) << 4) | (n % 10);  
  113   1      }
  114          
  115          // function bcdtochar
  116          // converts a number in BCD format to the decimal equivalent
  117          // decimal values must be stored in the Real Time Clock in BCD format
  118          // passed is the BCD format value
  119          // returned is the decimal equivalent
  120          unsigned char bcdtochar(unsigned char bcdnum)
  121          {
  122   1        return (bcdnum & 0x0f) + (bcdnum >> 4) * 10;
  123   1      }
  124          
ARM COMPILER V0.07,  i2c                                                                   26/11/04  11:06:09  PAGE 3   


ARM COMPILATION COMPLETE.  0 WARNING(S),  0 ERROR(S)