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uint16_t pwm_interval = ...;
uint16_t on_time[LEDS]; // this is the input determining LED brigthenss, must be <= pwm_interval
 
 
// this is the PWMing state
bool led_state[LEDS];
uint16_t led_next_toggle_time[LEDS];
 
// setup...
uint16_t start_time = TCNT1;
for (int i = 0; i < LEDS; i++) {
	led_state[i] = false;
	led_next_toggle_time[i] = start_time;
}
 
bool timeReached (uint16_t target_time)
{
	return (uint16_t)(TCNT1 - target_time) < UINT16_C(0x8000);
}
 
// drive the leds
while (1) {
	for (int i = 0; i < LEDS; i++) {
		if (timeReached(led_next_toggle_time[i])) {
			if (led_state[i]) {
				Turn led i OFF;
				led_state[i] = false;
				led_next_toggle_time[i] += pwm_inteval - on_time[i];
			} else {
				Turn led i ON;
				led_state[i] = true;
				led_next_toggle_time[i] += on_time[i];
			}
		}
	}
}
 

prog.cpp:1:1: error: ‘uint16_t’ does not name a type
 uint16_t pwm_interval = ...;
 ^
prog.cpp:2:1: error: ‘uint16_t’ does not name a type
 uint16_t on_time[LEDS]; // this is the input determining LED brigthenss, must be <= pwm_interval
 ^
prog.cpp:6:16: error: ‘LEDS’ was not declared in this scope
 bool led_state[LEDS];
                ^
prog.cpp:7:1: error: ‘uint16_t’ does not name a type
 uint16_t led_next_toggle_time[LEDS];
 ^
prog.cpp:10:1: error: ‘uint16_t’ does not name a type
 uint16_t start_time = TCNT1;
 ^
prog.cpp:11:1: error: expected unqualified-id before ‘for’
 for (int i = 0; i < LEDS; i++) {
 ^
prog.cpp:11:17: error: ‘i’ does not name a type
 for (int i = 0; i < LEDS; i++) {
                 ^
prog.cpp:11:27: error: ‘i’ does not name a type
 for (int i = 0; i < LEDS; i++) {
                           ^
prog.cpp:16:19: error: ‘uint16_t’ was not declared in this scope
 bool timeReached (uint16_t target_time)
                   ^
prog.cpp:17:1: error: expected ‘,’ or ‘;’ before ‘{’ token
 {
 ^
prog.cpp:22:1: error: expected unqualified-id before ‘while’
 while (1) {
 ^

Standard output is empty