minimize value after gamme correction to 1 to prevent LED off during dimming

arjanmels · arjanmels · commit e1f2e98df248 · 2018-11-17T10:01:48.000+01:00
diff --git a/code/espurna/light.ino b/code/espurna/light.ino
@@ -383,7 +383,7 @@ unsigned int _toPWM(unsigned long value, bool gamma, bool reverse) {
     } else if (value == LIGHT_MAX_VALUE) {
         value = LIGHT_LIMIT_PWM;
     } else if (gamma) {
-        value = pow(((float)value/LIGHT_MAX_VALUE),_light_gamma)*LIGHT_LIMIT_PWM;
+        value = std::max(1UL, (unsigned long)pow(((float)value/LIGHT_MAX_VALUE),_light_gamma)*LIGHT_LIMIT_PWM);
     } else {
         if (LIGHT_MAX_VALUE != LIGHT_LIMIT_PWM) value = map(value, 0, LIGHT_MAX_VALUE, 0, LIGHT_LIMIT_PWM);
     }

Original file line number	Diff line number	Diff line change
`@@ -383,7 +383,7 @@ unsigned int _toPWM(unsigned long value, bool gamma, bool reverse) {`
`383`	`383`	`} else if (value == LIGHT_MAX_VALUE) {`
`384`	`384`	`value = LIGHT_LIMIT_PWM;`
`385`	`385`	`} else if (gamma) {`
`386`		`- value = pow(((float)value/LIGHT_MAX_VALUE),_light_gamma)*LIGHT_LIMIT_PWM;`
	`386`	`+ value = std::max(1UL, (unsigned long)pow(((float)value/LIGHT_MAX_VALUE),_light_gamma)*LIGHT_LIMIT_PWM);`
`387`	`387`	`} else {`
`388`	`388`	`if (LIGHT_MAX_VALUE != LIGHT_LIMIT_PWM) value = map(value, 0, LIGHT_MAX_VALUE, 0, LIGHT_LIMIT_PWM);`
`389`	`389`	`}`