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Cannot drive LED using PWM

I want to drive LED using NRF_PWM0, but It is not working.

I want to increase brightness of LED but it is alyway on.

Please help me.

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/*
* Copyright 2019. Seonguk Jeong All rights reserved
* uAHRS Project
* Example : Pulse Width Modulation(PWM)
* Created at Dec. 11, 2019
* Author : Seonguk Jeong
*/
#include <nrf_drv_pwm.h>
#include <nrf_drv_timer.h>
#include <nrf_delay.h>
void Initialize();
void setDuty(int16_t duty);
int main(void){
// Initialize PWM
Initialize();
int16_t test = 0;
while(1){
if(test >= 32000){
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