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driver for CMA3000 VTI technologies 3axis accelerometer I2C

 
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ivan



Joined: 03 Apr 2008
Posts: 8
Location: Italy Rome

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driver for CMA3000 VTI technologies 3axis accelerometer I2C
PostPosted: Sun Nov 15, 2009 10:53 am     Reply with quote

Hi to all
I write this driver for CMA3000 VTI technologies 3axis accelerometer in I2C mode this is only device I found work down to 1.8V. I hope can be useful for someone.
Code:

#ifndef pin_SDA
#define pin_SDA  PIN_e0
#define pin_SCL  PIN_e1
#endif
#use i2c(master,sda=pin_SDA,scl=pin_SCL)
//register
#define WHO_AM_I   0x00   //Identification register  R  Output
#define REVID      0x01   //ASIC revision ID, fixed in metal  R  Output
#define CTRL       0x02   //Configuration (por, operation modes) RW  Conf
#define STATUS     0x03   //Status (por, EEPROM parity)  R  Output
#define RSTR       0x04   //Reset Register  RW  Conf
#define INT_STATUS 0x05   //Interrupt status register  R  Output
#define DOUTX      0x06   //X channel output data register  R  Output
#define DOUTY      0x07   //Y channel output data register  R  Output
#define DOUTZ      0x08   //Z channel output data register  R  Output
#define MDTHR      0x09   //Motion detection threshold value register RW  Conf
#define MDFFTMR    0x0A   //Free fall and motion detection time register RW  Conf
#define FFTHR      0x0B   //Free fall threshold value register  RW  Conf
#define I2C_ADDR   0x0C   //I2C device address  R  Conf
//------------------------  0Dh-19h    Reserved     

int1 cma3k_ready()
{
   int1 ack;
   i2c_start();            // If the write command is acknowledged,
   ack = i2c_write(0x38);  // then the device is ready.
   i2c_stop();
   return !ack;
}

void write_cma3k(int8 adr,int8 data)
{
   while(!cma3k_ready());
   i2c_start();
   i2c_write(0x38);
   i2c_write(adr);
   i2c_write(data);
   i2c_stop();
}

int8 read_cma3k(int8 adr)
{
  int8 ret;
    while(!cma3k_ready());
   i2c_start();
   i2c_write(0x38);
   i2c_write(adr);
   i2c_start();
   i2c_write(0x39);
   ret=i2c_read(0);
   i2c_stop();
   return ret;
}



void init_cma3k()
{
   output_float(pin_scl);
   output_float(pin_sda);
   write_cma3k(RSTR,0X02);
   write_cma3k(RSTR,0X0A);
   write_cma3k(RSTR,0X04);      //RESET ASIC
   write_cma3k(CTRL,0b10000011);// INIT CONF
}


Last edited by ivan on Mon Nov 16, 2009 1:13 pm; edited 6 times in total
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