ivan
Joined: 03 Apr 2008
Posts: 8
Location: Italy Rome
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| driver for CMA3000 VTI technologies 3axis accelerometer I2C |
 Posted: Sun Nov 15, 2009 10:53 am |
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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
}
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Last edited by ivan on Mon Nov 16, 2009 1:13 pm; edited 6 times in total |
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