File content as of revision 1:5bceb51fde85:

#include "mbed.h"
#include "stm32f7xx_hal.h"

#define TIMx                           TIM3
#define TIMx_CLK_ENABLE()              __TIM3_CLK_ENABLE()

/* Definition for TIMx Channel Pins */
#define TIMx_CHANNEL_GPIO_PORT()       __HAL_RCC_GPIOB_CLK_ENABLE();
#define TIMx_GPIO_PORT_CHANNEL1        GPIOB
#define TIMx_GPIO_PORT_CHANNEL2        GPIOB
#define TIMx_GPIO_PORT_CHANNEL3        GPIOB
#define TIMx_GPIO_PORT_CHANNEL4        GPIOB
#define TIMx_GPIO_PIN_CHANNEL1         GPIO_PIN_4
#define TIMx_GPIO_PIN_CHANNEL2         GPIO_PIN_5
#define TIMx_GPIO_AF_CHANNEL1          GPIO_AF2_TIM3
#define TIMx_GPIO_AF_CHANNEL2          GPIO_AF2_TIM3

TIM_HandleTypeDef TimHandle;
/* Prescaler value declartion*/
uint32_t uhPrescalerValue = 0;

TIM_OC_InitTypeDef sConfig;

void HAL_TIM_PWM_MspInit(TIM_HandleTypeDef *htim);
void Error_Handler(char *file, int line);


DigitalOut myled(LED1);

int main() {
    printf("HV Pulsgenerator V0.1\nGerald Ebmer 2018\n\n");
    
  uhPrescalerValue = (uint32_t)(((SystemCoreClock/ 2) / 10000000) - 1);
  
  TimHandle.Instance = TIMx;

  TimHandle.Init.Prescaler         = uhPrescalerValue;
  TimHandle.Init.Period            = 1000;
  TimHandle.Init.ClockDivision     = 0;
  TimHandle.Init.CounterMode       = TIM_COUNTERMODE_UP;
  TimHandle.Init.RepetitionCounter = 0;
  TimHandle.Init.AutoReloadPreload = TIM_AUTORELOAD_PRELOAD_DISABLE;
  if (HAL_TIM_PWM_Init(&TimHandle) != HAL_OK)
  {
    /* Initialization Error */
    Error_Handler(__FILE__, __LINE__);
  }

/*##-2- Configure the PWM channels #########################################*/
  /* Common configuration for all channels */
  sConfig.OCMode       = TIM_OCMODE_PWM1;
  sConfig.OCPolarity   = TIM_OCPOLARITY_HIGH;
  sConfig.OCFastMode   = TIM_OCFAST_DISABLE;
  sConfig.OCNPolarity  = TIM_OCNPOLARITY_HIGH;
  sConfig.OCNIdleState = TIM_OCNIDLESTATE_RESET;

  sConfig.OCIdleState  = TIM_OCIDLESTATE_RESET;

  /* Set the pulse value for channel 1 */
  sConfig.Pulse = 100;
  if (HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, TIM_CHANNEL_1) != HAL_OK)
  {
    /* Configuration Error */
    Error_Handler(__FILE__, __LINE__);
  }

  /* Set the pulse value for channel 2 */
  sConfig.Pulse = 900;
  sConfig.OCPolarity = TIM_OCPOLARITY_LOW;
  if (HAL_TIM_PWM_ConfigChannel(&TimHandle, &sConfig, TIM_CHANNEL_2) != HAL_OK)
  {
    /* Configuration Error */
    Error_Handler(__FILE__, __LINE__);
  }


  /*##-3- Start PWM signals generation #######################################*/
  /* Start channel 1 */
  if (HAL_TIM_PWM_Start(&TimHandle, TIM_CHANNEL_1) != HAL_OK)
  {
    /* PWM Generation Error */
    Error_Handler(__FILE__, __LINE__);
  }
  /* Start channel 2 */
  if (HAL_TIM_PWM_Start(&TimHandle, TIM_CHANNEL_2) != HAL_OK)
  {
    /* PWM Generation Error */
    Error_Handler(__FILE__, __LINE__);
  }
    
    while(1) {
        myled = !myled;
        wait(1);
    }
}

void HAL_TIM_PWM_MspInit(TIM_HandleTypeDef *htim)
{
  GPIO_InitTypeDef   GPIO_InitStruct;
  /*##-1- Enable peripherals and GPIO Clocks #################################*/
  /* TIMx Peripheral clock enable */
  TIMx_CLK_ENABLE();

  /* Enable all GPIO Channels Clock requested */
  TIMx_CHANNEL_GPIO_PORT();

  /* Configure PB.04 (pin 19 in CN7 connector) (TIM3_Channel1), PB.05 (pin 13 in CN7 connector) (TIM3_Channel2), PB.00 (pin 31 in CN10 connector) (TIM3_Channel3),
     PB.01 (pin 7 in CN10 connector) (TIM3_Channel4) in output, push-pull, alternate function mode
  */
  /* Common configuration for all channels */
  GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
  GPIO_InitStruct.Pull = GPIO_PULLUP;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;

  GPIO_InitStruct.Alternate = TIMx_GPIO_AF_CHANNEL1;
  GPIO_InitStruct.Pin = TIMx_GPIO_PIN_CHANNEL1;
  HAL_GPIO_Init(TIMx_GPIO_PORT_CHANNEL1, &GPIO_InitStruct);

  GPIO_InitStruct.Alternate = TIMx_GPIO_AF_CHANNEL2;
  GPIO_InitStruct.Pin = TIMx_GPIO_PIN_CHANNEL2;
  HAL_GPIO_Init(TIMx_GPIO_PORT_CHANNEL2, &GPIO_InitStruct);
}


/**
  * @brief  This function is executed in case of error occurrence.
  * @param  file: The file name as string.
  * @param  line: The line in file as a number.
  * @retval None
  */
void Error_Handler(char *file, int line)
{
  fprintf(stderr, "Error in file %s linenr %d!\n",file,line);
  /* USER CODE BEGIN Error_Handler_Debug */
  /* User can add his own implementation to report the HAL error return state */
  while(1)
  {
  }
  /* USER CODE END Error_Handler_Debug */
}