Trouble using alternate function on STM32C092

[Sanderthunder]

Hi, 

i'm missing something in the configuration of alternate function on STM32C092.

I can't get working alternare function on shared pin, interested physical pin are  PIN 1, 15, 20. 

Example1:

PIN15 only the function on PA8 are working properly, neither (PB0,PB1 or PB2) are working at all with any function even a simple toggle. I'm pretty sure that the Alternate Function property are being generated correctly.

Example2:

PIN20 Generating a PWM with TIM3_CH1 only works on PB6, if the same timer is passed to PB4 i can't get any output.

Same on PIN1 i can get output only on PB7. 

There is the HAL_TIM_MspPostInit where PB6 is working as expected but PB1 isn't:

void HAL_TIM_MspPostInit(TIM_HandleTypeDef* htim)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};
  if(htim->Instance==TIM3)
  {
    /* USER CODE BEGIN TIM3_MspPostInit 0 */

    /* USER CODE END TIM3_MspPostInit 0 */

    __HAL_RCC_GPIOB_CLK_ENABLE();
    /**TIM3 GPIO Configuration
    PB1     ------> TIM3_CH4
    PB6     ------> TIM3_CH1
    */
    GPIO_InitStruct.Pin = GPIO_PIN_1;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    GPIO_InitStruct.Alternate = GPIO_AF1_TIM3;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

    GPIO_InitStruct.Pin = GPIO_PIN_6;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    GPIO_InitStruct.Alternate = GPIO_AF12_TIM3;
    HAL_GPIO_Init(GPIOB, &GPIO_InitStruct);

    /* USER CODE BEGIN TIM3_MspPostInit 1 */

    /* USER CODE END TIM3_MspPostInit 1 */
  }

}

Register after init:

TIM3 Init:

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 = 6000;
  htim3.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim3.Init.Period = 10;
  htim3.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  htim3.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_ENABLE;
  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 = 5;
  sConfigOC.OCPolarity = TIM_OCPOLARITY_HIGH;
  sConfigOC.OCFastMode = TIM_OCFAST_DISABLE;
  if (HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_1) != HAL_OK)
  {
    Error_Handler();
  }
  if (HAL_TIM_PWM_ConfigChannel(&htim3, &sConfigOC, TIM_CHANNEL_4) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN TIM3_Init 2 */

  /* USER CODE END TIM3_Init 2 */
  HAL_TIM_MspPostInit(&htim3);

}

On the hardware side i have already cutted off any component that can interfere. 

Did someone have some clue? 

Useful info:

MCU : STM32C092FCP6 TSSOP20

CubeMX Ver. 6.15.0-RC7

CubeIDE Ver: 1.14.0

Thank you.

[mƎALLEm · Accepted solution]

Hello,

Did you configure SYSCFG_CFGR3/PIN MUX?

From AN5673:

From RM0490 / section: System configuration controller (SYSCFG):

[Sanderthunder]

This is exactly my issue, thank you for helping me out. It's the first time that i use a STM32C0 or any mcu with shared pin, i didn't read enough deeply RM0490. MY BAD.

Why in hell they don't put nothing in the sys mode and config?

Even in the datasheet they only talk about PA11 and PA12.

"Pins PA9 and PA10 can be remapped in place of pins PA11 and PA12 (default mapping), using SYSCFG_CFGR1 register."

Thank u again.