I don't think I am mixing up those two bits. Here are some code snippets:
/*
* Need to set LOW_ODR register to set low odr (if necessary)
* if not required, comment out this routine
*/
ret = ST_gyro_LOW_ODR_set(I2C0, L3G20H_I2C_ADD_H, PROPERTY_ENABLE, L3G20H_LOW_ODR);
if(ret == 2)
{
printf("Function ST_gyro_LOW_ODR_set completed ok \n");
}
else
{
printf("Function ST_gyro_LOW_ODR_set did NOT complete ok, with code %i \n", ret);
}
This one is in the main() routine. PROPERTY_ENABLE is define as '1', and L3G20H_LOW_ODR is the address, and defined as '0x39'
#define L3G20H_LOW_ODR 0x39U
typedef struct {
uint8_t val;
struct bitwise_L3lowode{
uint8_t low_odr :1;
uint8_t not_used01 :1;
uint8_t sw_res :1;
uint8_t i2c_dis :1;
uint8_t not_used02 :1;
uint8_t drdy_hl :1;
uint8_t not_used03 :1;
uint8_t not_used04 :1;
}bitwise;
} L3G20H_low_odr_t;
Above code snippet is in my L3G20H.h library, showing how the bits are outlined.
int32_t ST_gyro_LOW_ODR_set(I2C_TypeDef *i2c, uint8_t addr, uint8_t val, uint8_t subAddr)
{
I2C_TransferSeq_TypeDef seq;
I2C_TransferReturn_TypeDef ret;
uint8_t i2c_read_data[1];
uint8_t i2c_write_data[2];
L3G20H_low_odr_t low_odr;
seq.addr = addr;
seq.flags = I2C_FLAG_WRITE_READ;
/*
* need to get value of ctrl4 register before we modify and write it
*
*/
i2c_write_data[0] = subAddr;
seq.buf[0].data = i2c_write_data;
seq.buf[0].len = 1;
/*
* location to store register
*/
seq.buf[1].data = i2c_read_data;
seq.buf[1].len = 1;
/*
* call transfer routine
*/
ret = I2CSPM_Transfer(i2c,&seq);
if(ret != i2cTransferDone)
return (int)ret;
low_odr.val = i2c_read_data[0];
low_odr.bitwise.low_odr = val;
/*
* Now we need to perform the write of the data back into the ctrl_reg4 location
*/
seq.addr = addr;
seq.flags = I2C_FLAG_WRITE;
i2c_write_data[0] = subAddr;
i2c_write_data[1] = low_odr.val;
seq.buf[0].data = i2c_write_data;
seq.buf[0].len = 2;
seq.buf[1].data = i2c_read_data;
seq.buf[1].len = 0;
ret = I2CSPM_Transfer(i2c,&seq);
if(ret != i2cTransferDone)
return (int)ret;
return (int)2;
}
This last code snippet is the read/write I2C to set the LOW_ODR bit.
Thanks again for any help.
