Hi! i am doing example pwm ws2812 with dma, configure the time 1 with ARR=60, using clock= 48 mhz, my pwm not working full buffer i don´t know why not work full buffer, the pwm have 12 pulse, i am sending for one led ws2812 is 24 pulse.
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include "MATH.h"
/* USER CODE END Includes */
/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */
#define MAX_LED 8
#define USE_BRIGHTNESS 0
uint8_t LED_Data[MAX_LED][4];
uint8_t LED_Mod[MAX_LED][4]; // for brightness
volatile int datasentflag;
//uint16_t pwmData[(24*MAX_LED)+50];
uint32_t indx=0;
uint32_t color;
uint32_t cont=0;
uint32_t data1=0;
//uint16_t pwmData[74];
/* USER CODE END PTD */
/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/* USER CODE END PD */
/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */
/* USER CODE END PM */
/* Private variables ---------------------------------------------------------*/
TIM_HandleTypeDef htim1;
DMA_HandleTypeDef hdma_tim1_ch2;
/* USER CODE BEGIN PV */
/* USER CODE END PV */
/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_DMA_Init(void);
static void MX_TIM1_Init(void);
/* USER CODE BEGIN PFP */
void HAL_TIM_PWM_PulseFinishedCallback(TIM_HandleTypeDef *htim)
{
//HAL_TIM_PWM_Stop_DMA(&htim1, TIM_CHANNEL_2);
//datasentflag=1;
}
uint16_t pwmData[74];
void send(int Green, int Red, int Blue)
{
uint32_t data = (Green<<16)|(Red<<8)|Blue;
for(int i=23;i>=0;i--)
{
if(data&(1<<i)) pwmData[i] =40;
else pwmData[i] = 20;
indx=i;
cont++;
}
indx++;
for (int i=24; i<50; i++)
{
pwmData[i] = 0;
indx++;
cont++;
}
indx=0;
HAL_TIM_PWM_Start_DMA(&htim1, TIM_CHANNEL_2,(uint32_t *)pwmData,74);
}
/*--------------------------------------------------------------------------------*/
/*--------------------------------------------------------------------------------*/
void WS2812_Send (void)
{
indx=0;
for (int i= 0; i<3; i++)
{
/*
#if USE_BRIGHTNESS
color = ((LED_Mod[i][1]<<16) | (LED_Mod[i][2]<<8) | (LED_Mod[i][3]));
#else
color = ((LED_Data[i][1]<<16) | (LED_Data[i][2]<<8) | (LED_Data[i][3]));
#endif
*/
for (int i=23; i>=0; i--)
{
if (color&(1<<i))
{
pwmData[indx] = 38; // 2/3 of 90
}
else pwmData[indx] = 19; // 1/3 of 90
indx++;
}
}
for (int i=0; i<50; i++)
{
pwmData[indx] = 0;
indx++;
}
HAL_TIM_PWM_Start_DMA(&htim1, TIM_CHANNEL_2, (uint32_t *)pwmData,indx);
while (!datasentflag){};
datasentflag = 0;
}
/*-------------------------------------------------------------------------------------------------*/
/*------------------------------------------------------------------------------------------------*/
void Set_LED (int LEDnum, int Red, int Green, int Blue)
{
LED_Data[LEDnum][0] = LEDnum;
LED_Data[LEDnum][1] = Green;
LED_Data[LEDnum][2] = Red;
LED_Data[LEDnum][3] = Blue;
}
#define PI 3.14159265
void Set_Brightness (int brightness) // 0-45
{
#if USE_BRIGHTNESS
if (brightness > 45) brightness = 45;
for (int i=0; i<MAX_LED; i++)
{
LED_Mod[i][0] = LED_Data[i][0];
for (int j=1; j<4; j++)
{
float angle = 90-brightness; // in degrees
angle = angle*PI / 180; // in rad
LED_Mod[i][j] = (LED_Data[i][j])/(tan(angle));
}
}
#endif
}
/* USER CODE END PFP */
/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */
/* USER CODE END 0 */
/**
* @brief The application entry point.
* @retval int
*/
int main(void)
{
/* USER CODE BEGIN 1 */
/* USER CODE END 1 */
/* MCU Configuration--------------------------------------------------------*/
/* Reset of all peripherals, Initializes the Flash interface and the Systick. */
HAL_Init();
/* USER CODE BEGIN Init */
/* USER CODE END Init */
/* Configure the system clock */
SystemClock_Config();
/* USER CODE BEGIN SysInit */
/* USER CODE END SysInit */
/* Initialize all configured peripherals */
MX_GPIO_Init();
MX_DMA_Init();
MX_TIM1_Init();
/* USER CODE BEGIN 2 */
// TIM1->CCR3=60;
// HAL_TIM_PWM_Start(&htim1, TIM_CHANNEL_3);
send (0,255,0);
/*
Set_LED(0, 255, 0, 0);
Set_LED(1, 0, 255, 0);
Set_LED(2, 0, 0, 255);
Set_LED(3, 46, 89, 128);
Set_LED(4, 156, 233, 100);
Set_LED(5, 102, 0, 235);
Set_LED(6, 47, 38, 77);
Set_LED(7, 255, 200, 0);
*/
/* USER CODE END 2 */
/* Infinite loop */
/* USER CODE BEGIN WHILE */
while (1)
{
/* USER CODE END WHILE */
/* USER CODE BEGIN 3 */
send (5,255,18);
HAL_GPIO_WritePin(led_GPIO_Port, led_Pin, GPIO_PIN_SET);
HAL_Delay(200);
HAL_GPIO_WritePin(led_GPIO_Port, led_Pin, GPIO_PIN_RESET);
HAL_Delay(200);
}
/* USER CODE END 3 */
}
/**
* @brief System Clock Configuration
* @retval None
*/
void SystemClock_Config(void)
{
RCC_OscInitTypeDef RCC_OscInitStruct = {0};
RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
/** Initializes the RCC Oscillators according to the specified parameters
* in the RCC_OscInitTypeDef structure.
*/
RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
RCC_OscInitStruct.HSIState = RCC_HSI_ON;
RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL12;
RCC_OscInitStruct.PLL.PREDIV = RCC_PREDIV_DIV1;
if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
{
Error_Handler();
}
/** Initializes the CPU, AHB and APB buses clocks
*/
RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
|RCC_CLOCKTYPE_PCLK1;
RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_1) != HAL_OK)
{
Error_Handler();
}
}
/**
* @brief TIM1 Initialization Function
* @param None
* @retval None
*/
static void MX_TIM1_Init(void)
{
/* USER CODE BEGIN TIM1_Init 0 */
/* USER CODE END TIM1_Init 0 */
TIM_ClockConfigTypeDef sClockSourceConfig = {0};
TIM_MasterConfigTypeDef sMasterConfig = {0};
TIM_OC_InitTypeDef sConfigOC = {0};
TIM_BreakDeadTimeConfigTypeDef sBreakDeadTimeConfig = {0};
/* USER CODE BEGIN TIM1_Init 1 */
/* USER CODE END TIM1_Init 1 */
htim1.Instance = TIM1;
htim1.Init.Prescaler = 0;
htim1.Init.CounterMode = TIM_COUNTERMODE_UP;
htim1.Init.Period = 60-1;
htim1.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
htim1.Init.RepetitionCounter = 0;
htim1.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE;
if (HAL_TIM_Base_Init(&htim1) != HAL_OK)
{
Error_Handler();
}
sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;
if (HAL_TIM_ConfigClockSource(&htim1, &sClockSourceConfig) != HAL_OK)
{
Error_Handler();
}
if (HAL_TIM_PWM_Init(&htim1) != HAL_OK)
{
Error_Handler();
}
sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;
sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;
if (HAL_TIMEx_MasterConfigSynchronization(&htim1, &sMasterConfig) != HAL_OK)
{
Error_Handler();
}
sConfigOC.OCMode = TIM_OCMODE_PWM1;
sConfigOC.Pulse = 0;
sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
sConfigOC.OCNPolarity = TIM_OCNPOLARITY_HIGH;
sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
sConfigOC.OCIdleState = TIM_OCIDLESTATE_RESET;
sConfigOC.OCNIdleState = TIM_OCNIDLESTATE_RESET;
if (HAL_TIM_PWM_ConfigChannel(&htim1, &sConfigOC, TIM_CHANNEL_2) != HAL_OK)
{
Error_Handler();
}
sBreakDeadTimeConfig.OffStateRunMode = TIM_OSSR_DISABLE;
sBreakDeadTimeConfig.OffStateIDLEMode = TIM_OSSI_DISABLE;
sBreakDeadTimeConfig.LockLevel = TIM_LOCKLEVEL_OFF;
sBreakDeadTimeConfig.DeadTime = 0;
sBreakDeadTimeConfig.BreakState = TIM_BREAK_DISABLE;
sBreakDeadTimeConfig.BreakPolarity = TIM_BREAKPOLARITY_HIGH;
sBreakDeadTimeConfig.AutomaticOutput = TIM_AUTOMATICOUTPUT_DISABLE;
if (HAL_TIMEx_ConfigBreakDeadTime(&htim1, &sBreakDeadTimeConfig) != HAL_OK)
{
Error_Handler();
}
/* USER CODE BEGIN TIM1_Init 2 */
/* USER CODE END TIM1_Init 2 */
HAL_TIM_MspPostInit(&htim1);
}
1 ACCEPTED SOLUTION
Accepted Solutions
I AM GOING TO ANSWER IN UPPERCASE ALSO, AS IF WE WERE SHOUTING INSIDE A HAIL STORM.
YES, IT WILL MAKE YOUR SYSTEM CLOCK LESS ACCURATE AND PRONE TO DRIFT WITH TEMPERATURE, BUT NEOPIXELS TOLERATE A BIT OF PWM DRIFT, CHECK IT OUT YOURSELF.
>> MY BLUEPILL IS FALSE IN THE ALIEXPRESS, I BUY BLUEPILL AND NOT WORK.
GOOD LUCK WITH THAT
