800KHz Frequency generation using STM32G070RBT6

[Preetpal]

I am trying to get 800KHz frequency with Timer 3 and timer clock is 64MHz and i am using below setting to initalize the timer, but its frequency is 666.66KHz. Pls provide a solution of this problem ASAP......

static void MX_TIM3_Init(void)

{



/* USER CODE BEGIN TIM3_Init 0 */



/* USER CODE END TIM3_Init 0 */



TIM_ClockConfigTypeDef sClockSourceConfig = {0};

TIM_MasterConfigTypeDef sMasterConfig = {0};

TIM_OC_InitTypeDef sConfigOC = {0};



/* USER CODE BEGIN TIM3_Init 1 */



/* USER CODE END TIM3_Init 1 */

htim3.Instance = TIM3;

htim3.Init.Prescaler = 0;

htim3.Init.CounterMode = TIM_COUNTERMODE_UP;

htim3.Init.Period = 79;

htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;

htim3.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;

if (HAL_TIM_Base_Init(&htim3) != HAL_OK)

{

Error_Handler();

}

sClockSourceConfig.ClockSource = TIM_CLOCKSOURCE_INTERNAL;

if (HAL_TIM_ConfigClockSource(&htim3, &sClockSourceConfig) != HAL_OK)

{

Error_Handler();

}

if (HAL_TIM_PWM_Init(&htim3) != HAL_OK)

{

Error_Handler();

}

sMasterConfig.MasterOutputTrigger = TIM_TRGO_RESET;

sMasterConfig.MasterSlaveMode = TIM_MASTERSLAVEMODE_DISABLE;

if (HAL_TIMEx_MasterConfigSynchronization(&htim3, &sMasterConfig) != HAL_OK)

{

Error_Handler();

}

sConfigOC.OCMode = TIM_OCMODE_PWM1;

sConfigOC.Pulse = 0;

sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;

sConfigOC.OCFastMode = TIM_OCFAST_ENABLE;

if (HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_3) != HAL_OK)

{

Error_Handler();

}

/* USER CODE BEGIN TIM3_Init 2 */



/* USER CODE END TIM3_Init 2 */

HAL_TIM_MspPostInit(&htim3);



}

[TDK]

This is quantization error in your logic analyzer. Increase your sampling rate to max or take the average of many different periods.

The timer settings and the output frequency are correct--look at the long term trend.

[Hl_st]

Hello,

there should be set sConfigOC.Pulse value to non zero value to generate PWM on output pin. Try to set

sConfigOC.Pulse = 39;

 (50 % duty cycle).