1.SDK:SDK17.1
2.IAR V9.2
3.
static float inv_sqrt(float x)
{
float xhalf = 0.5f * x;
int i = *(int *)&x;
i = 0x5f375a86 - (i >> 1); // this is magic.
x = *(float *)&i;
x = x * (1.5f - xhalf * x * x); // 1st newton iteration.
x = x * (1.5f - xhalf * x * x); // repeating increases accuracy, this can be remove.
return 1 / x;
}
volatile float vf_value = 0.0;
int main(void)
{
...
vf_value= inv_sqrt(1.1);
...
}
ble_app_hrs_freertos demo will alway 5mA.
but ble_app_beacon is normal.
