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Use integer arithmetic for light sensor

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This commit is contained in:
fruchti 2020-07-16 22:43:39 +02:00
parent 3121557afd
commit 187c915799
5 changed files with 37 additions and 38 deletions
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12
src/light_sensor.h
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@ -8,15 +8,19 @@
// ADC polling interval in milliseconds
#define LIGHTSENSOR_INTERVAL 250
// Resolution of the brightness output
#define LIGHTSENSOR_BITS 12
#define LIGHTSENSOR_MAX (1 << LIGHTSENSOR_BITS)
// 'Forgetting factor' of the rolling brightness average
#define LIGHTSENSOR_LAMBDA 0.9f
#define LIGHTSENSOR_LAMBDA_BITS 4
// Bounds for converting absolute to relative brightness: Consider everything
// near the minimum or maximum 0.0 or 1.0, respectively
#define LIGHTSENSOR_LOW_BOUND 0.005f
#define LIGHTSENSOR_HIGH_BOUND 0.9f
#define LIGHTSENSOR_LOW_BOUND ((unsigned int)(0.005 * LIGHTSENSOR_MAX))
#define LIGHTSENSOR_HIGH_BOUND ((unsigned int)(0.9 * LIGHTSENSOR_MAX))
extern float LightSensor_RelativeBrightness;
extern int LightSensor_RelativeBrightness;
void LightSensor_Init(void);
void LightSensor_Poll(void);