static int lm75_readtemp(FAR struct lm75_dev_s *priv, FAR b16_t *temp)
{
b16_t temp16;
int ret;
/* Read the raw temperature data (b16_t) */
ret = lm75_readb16(priv, LM75_TEMP_REG, &temp16);
if (ret < 0)
{
sndbg("lm75_readb16 failed: %d\n", ret);
return ret;
}
sndbg("Centigrade: %08x\n", temp16);
/* Was fahrenheit requested? */
if (priv->fahrenheit)
{
/* Centigrade to Fahrenheit conversion: F = 9*C/5 + 32 */
temp16 = b16mulb16(temp16, B16_9DIV5) + B16_32;
sndbg("Fahrenheit: %08x\n", temp16);
}
*temp = temp16;
return OK;
}
static b16_t nxgl_interpolate(b16_t x, b16_t dy, b16_t dxdy)
{
b16_t dx = b16mulb16(dy, dxdy);
return x + dx;
}