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https://github.com/DarkFlippers/unleashed-firmware.git
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70 lines
1.7 KiB
C
70 lines
1.7 KiB
C
#include "lightmeter_helper.h"
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#include "lightmeter_config.h"
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static const float aperture_numbers[] = {
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[AP_1] = 1.0,
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[AP_1_4] = 1.4,
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[AP_2] = 2.0,
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[AP_2_8] = 2.8,
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[AP_4] = 4.0,
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[AP_5_6] = 5.6,
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[AP_8] = 8,
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[AP_11] = 11,
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[AP_16] = 16,
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[AP_22] = 22,
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[AP_32] = 32,
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[AP_45] = 45,
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[AP_64] = 64,
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[AP_90] = 90,
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[AP_128] = 128,
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};
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static const float time_numbers[] = {
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[SPEED_8000] = 1.0 / 8000, [SPEED_4000] = 1.0 / 4000, [SPEED_2000] = 1.0 / 2000,
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[SPEED_1000] = 1.0 / 1000, [SPEED_500] = 1.0 / 500, [SPEED_250] = 1.0 / 250,
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[SPEED_125] = 1.0 / 125, [SPEED_60] = 1.0 / 60, [SPEED_30] = 1.0 / 30,
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[SPEED_15] = 1.0 / 15, [SPEED_8] = 1.0 / 8, [SPEED_4] = 1.0 / 4,
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[SPEED_2] = 1.0 / 2, [SPEED_1S] = 1.0, [SPEED_2S] = 2.0,
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[SPEED_4S] = 4.0, [SPEED_8S] = 8.0, [SPEED_15S] = 15.0,
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[SPEED_30S] = 30.0,
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};
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float lux2ev(float lux) {
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return log2(lux / 2.5);
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}
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float getMinDistance(float x, float v1, float v2) {
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if(x - v1 > v2 - x) {
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return v2;
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}
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return v1;
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}
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// Convert calculated aperture value to photography style aperture value.
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float normalizeAperture(float a) {
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for(int i = 0; i < AP_NUM; i++) {
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float a1 = aperture_numbers[i];
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float a2 = aperture_numbers[i + 1];
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if(a1 < a && a2 >= a) {
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return getMinDistance(a, a1, a2);
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}
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}
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return 0;
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}
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float normalizeTime(float a) {
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for(int i = 0; i < SPEED_NUM; i++) {
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float a1 = time_numbers[i];
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float a2 = time_numbers[i + 1];
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if(a1 < a && a2 >= a) {
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return getMinDistance(a, a1, a2);
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}
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}
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return 0;
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}
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