int i2cdev_write(int fd, uint8_t *buf, size_t count, uint16_t addr)
{
return i2cdev_transfer(fd, buf, count, addr, 0);
}
int i2ctool_get(FAR struct i2ctool_s *i2ctool, int fd, uint8_t regaddr,
FAR uint16_t *result)
{
struct i2c_msg_s msg[2];
union
{
uint16_t data16;
uint8_t data8;
} u;
int ret;
/* Set up data structures */
msg[0].frequency = i2ctool->freq;
msg[0].addr = i2ctool->addr;
msg[0].flags = 0;
msg[0].buffer = ®addr;
msg[0].length = 1;
msg[0].frequency = i2ctool->freq;
msg[1].addr = i2ctool->addr;
msg[1].flags = I2C_M_READ;
if (i2ctool->width == 8)
{
msg[1].buffer = &u.data8;
msg[1].length = 1;
}
else
{
msg[1].buffer = (uint8_t*)&u.data16;
msg[1].length = 2;
}
if (i2ctool->start)
{
ret = i2cdev_transfer(fd, &msg[0], 1);
if (ret== OK)
{
ret = i2cdev_transfer(fd, &msg[1], 1);
}
}
else
{
ret = i2cdev_transfer(fd, msg, 2);
}
/* Return the result of the read operation */
if (ret == OK)
{
if (i2ctool->width == 8)
{
*result = (uint16_t)u.data8;
}
else
{
*result = u.data16;
}
}
return ret;
}
int i2cdev_read(int fd, uint8_t *buf, size_t count, uint16_t addr)
{
return i2cdev_transfer(fd, buf, count, addr, 1);
}