PWM

Hi there,

i start to use aSTM32G031 Nucleo with some W2812b . I configure timer1 PWM output but when i try to generate the PWM i just say a lot of noise. I use one library i wrote for another microcontroller and i'm sure work. I share my configuration and i hope someone can help me .

and the code

uint8_t led[led_number][3];
HAL_TIM_PWM_Init(&htim1);
 /* USER CODE END 2 */
 
 /* Infinite loop */
 /* USER CODE BEGIN WHILE */
 while (1)
 {
		
		for(uint8_t cont=0; cont<255;cont++){
		for(uint8_t nLed=0; nLed<led_number;nLed++){
			led[nLed][0]=cont;
			led[nLed][1]=0;
			led[nLed][2]=0;			
		}
		ws2812sendData(led); 
		HAL_Delay(30);
	}
	for(uint8_t cont=255; cont>0;cont--){
		for(uint8_t nLed=0; nLed<led_number;nLed++){
			led[nLed][0]=cont;
			led[nLed][1]=0;
			led[nLed][2]=0;			
		}
		ws2812sendData(led);
		HAL_Delay(30);
	}
 /* USER CODE END WHILE */
 
 /* USER CODE BEGIN 3 */
 }
 /* USER CODE END 3 */
}

WS2812B.C

#include "WS2812.h"
#include "stm32g0xx_hal.h"
#include <stdio.h>
 
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
 
 
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
 
extern TIM_HandleTypeDef htim1;
extern DMA_HandleTypeDef hdma_tim1_ch4;
#define time &htim1
uint8_t indx=0;
uint8_t ws2812_hi;
uint8_t ws2812_lo;
uint8_t datasentflag=0;
uint16_t pwmData[(24*led_number)+50];
uint32_t time_period;	
 
 
uint8_t i=0;
/* Private function prototypes -----------------------------------------------*/
/* Private functions ---------------------------------------------------------*/
 
 
 
void HAL_TIM_PWM_PulseFinishedCallback(TIM_HandleTypeDef *htim)
{
	HAL_TIM_PWM_Stop_DMA(&htim1, TIM_CHANNEL_4);
	datasentflag=1;
}
 
 
/**
 * @brief 
 * @param None
 * @retval None
 */
 
void ws2812_init(void){
	uint32_t frequency;
	frequency = HAL_RCC_GetSysClockFreq();
	time_period = (frequency / ws2812_fequ)-1 ;
	ws2812_lo = time_period / 3;
	ws2812_hi = (time_period * 2)/3;
}
 
/**
 * @brief 
 * @param None
 * @retval None
 */
 
void ws2812_fill_black(void){
	indx=0;;
	for(indx = 0 ; indx < led_data_size ; indx ++){
		pwmData[indx]= ws2812_lo;
		indx++;
	}
	ws2812_reset();
	ws2812Send();
}
 
 
/**
 * @brief 
 * @param None
 * @retval None
 */
 
void ws2812sendData(uint8_t led[led_number][3]){
	indx=0;
	uint32_t color;
	for(i=0; i < led_number ;i++){
		color = ((led[i][1]<<16) | (led[i][0]<<8) | (led[i][2]));
		for(int8_t u=23; u>=0; u--){
			if (color&(1<<u))
			{
				pwmData[indx] = ws2812_hi; 
			}
			else{
				pwmData[indx] = ws2812_lo; 
			}
			indx++;
		}
	}
 	for (uint8_t y=0; y<50; y++){
		pwmData[indx] = ws2812_rst;
		indx++;
	}
	ws2812Send();
}	
 
/**
 * @brief 
 * @param None
 * @retval None
 */
 
void ws2812_reset(void){
	for(indx = 0 ; indx < reset ; indx ++){
		pwmData[indx]= ws2812_rst;
		indx++;
	}
	HAL_TIM_PWM_Start_DMA(&htim1, TIM_CHANNEL_4, (uint32_t *)pwmData, 50);
	while (!datasentflag){};
	datasentflag = 0;	
}	
 
/**
 * @brief 
 * @param None
 * @retval None
 */
 
void ws2812Send(void){
	HAL_TIM_PWM_Start_DMA(&htim1, TIM_CHANNEL_4, (uint32_t *)pwmData, indx);
	while (!datasentflag){};
	datasentflag = 0;
}

Thanks a lot

Sergio