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PWM Output on STM3210E-EVAL board

Question asked by DWORD32 on Aug 27, 2015
Latest reply on Nov 2, 2015 by Clive One
I'm trying to setup one of the LEDs on the STM3210E-EVAL board as a PWM output so that I can vary the brightness.  I am targeting the red LED, which is on port F, pin 8.  I have setup timer 13 which should be tied to that pin for PWM output, but I feel like like I am missing a step somewhere.   Here is the current function to initialize the pin, setup the timer, and setup the PWM:

void led_init(void)
  TIM_OC_InitTypeDef sConfigOC;
  TIM_HandleTypeDef htim13;
  /*Configure GPIO pins : PF8 */
  GPIO_InitStruct.Pin = GPIO_PIN_8;
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Speed = GPIO_SPEED_LOW;
  HAL_GPIO_Init(GPIOF, &GPIO_InitStruct);
  htim13.Instance = TIM13;
  htim13.Init.Prescaler = (uint32_t)(72000000 / 2000000) - 1;
  htim13.Init.CounterMode = TIM_COUNTERMODE_UP;
  htim13.Init.Period = 700;
  htim13.Init.ClockDivision = TIM_CLOCKDIVISION_DIV1;
  sConfigOC.OCMode = TIM_OCMODE_PWM1;
  sConfigOC.Pulse = 350;
  HAL_TIM_PWM_ConfigChannel(&htim13, &sConfigOC, TIM_CHANNEL_1);
  HAL_TIM_PWM_Start(&htim13, TIM_CHANNEL_1);

Any advice would be greatly appreciated! 

Thank you!