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IKARA.15
IKARA.15
Associate II
May 7, 2019
Question

Why my i2c clk always high ?

  • May 7, 2019
  • 2 replies
  • 902 views

When i observe the clk pin always high but sometimes, somehow that i dont know i can see clk pulses but really i dont know reason why. Also i am trying to communicate touch ic and it has change pin sense the touchs. This pin always high and when the touch sensed pin hold low after touch released pin float high. At that time i decided this pin as external interrupt , this pin also always low as clk pin. Tell me what can i do guys i need your help.

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2 replies

Mon2
Mon2
Senior III
May 7, 2019

Post your code / project.

​

First guess is that you have configured the i2c pins as PP ( push-pull) style.​

IKARA.15
IKARA.15Author
Associate II
May 7, 2019
static void MX_GPIO_Init(void)
{
 GPIO_InitTypeDef GPIO_InitStruct = {0};
 
 /* GPIO Ports Clock Enable */
 __HAL_RCC_GPIOC_CLK_ENABLE();
 __HAL_RCC_GPIOD_CLK_ENABLE();
 __HAL_RCC_GPIOA_CLK_ENABLE();
 __HAL_RCC_GPIOB_CLK_ENABLE();
 
 /*Configure GPIO pin Output Level */
 HAL_GPIO_WritePin(GPIOC, LD4_Pin|LD3_Pin, GPIO_PIN_RESET);
 
 /*Configure GPIO pin : PA0 */
 GPIO_InitStruct.Pin = GPIO_PIN_0;
 GPIO_InitStruct.Mode = GPIO_MODE_IT_RISING;
 GPIO_InitStruct.Pull = GPIO_PULLDOWN;
 HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
 
 /*Configure GPIO pins : LD4_Pin LD3_Pin */
 GPIO_InitStruct.Pin = LD4_Pin|LD3_Pin;
 GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
 GPIO_InitStruct.Pull = GPIO_NOPULL;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
 HAL_GPIO_Init(GPIOC, &GPIO_InitStruct);
	
	 GPIO_InitStruct.Pin = GPIO_PIN_4;
 GPIO_InitStruct.Mode = GPIO_MODE_EVT_RISING;
 GPIO_InitStruct.Pull = GPIO_PULLUP;
 HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
 
}

here is gpio

void HAL_I2C_MspInit(I2C_HandleTypeDef* hi2c)
{
 
 GPIO_InitTypeDef GPIO_InitStruct = {0};
 if(hi2c->Instance==I2C1)
 {
 /* USER CODE BEGIN I2C1_MspInit 0 */
 
 /* USER CODE END I2C1_MspInit 0 */
 
 __HAL_RCC_GPIOB_CLK_ENABLE();
 /**I2C1 GPIO Configuration 
 PB6 ------> I2C1_SCL
 PB7 ------> I2C1_SDA 
 */
 GPIO_InitStruct.Pin = GPIO_PIN_6|GPIO_PIN_7;
 GPIO_InitStruct.Mode = GPIO_MODE_AF_OD;
 GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
 HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);
 
 /* Peripheral clock enable */
 __HAL_RCC_I2C1_CLK_ENABLE();
 /* USER CODE BEGIN I2C1_MspInit 1 */
 
 /* USER CODE END I2C1_MspInit 1 */
 }
 
}

static void MX_I2C1_Init(void)
{
 
 /* USER CODE BEGIN I2C1_Init 0 */
 
 /* USER CODE END I2C1_Init 0 */
 
 /* USER CODE BEGIN I2C1_Init 1 */
 
 /* USER CODE END I2C1_Init 1 */
 hi2c1.Instance = I2C1;
 hi2c1.Init.ClockSpeed = 400000;
 hi2c1.Init.DutyCycle = I2C_DUTYCYCLE_2;
 hi2c1.Init.OwnAddress1 = 0;
 hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
 hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
 hi2c1.Init.OwnAddress2 = 0;
 hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
 hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
 if (HAL_I2C_Init(&hi2c1) != HAL_OK)
 {
 Error_Handler();
 }
 /* USER CODE BEGIN I2C1_Init 2 */
 
 /* USER CODE END I2C1_Init 2 */
 
}

here is my configure codes. As u see i2c pins as OD

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