/**
  * @brief  This function sets up the I2C1 hardware as mentioned in the
  *         hardware description in the header file. Afterwards I2C1 is
  *         enabled.
    *   @note       PB6 == SCL, PB7 == SDA
  * @param  None
  * @retval None
  */
void I2C_Setup(void)
{
  GPIO_InitTypeDef GPIO_InitStructure;
  I2C_InitTypeDef  I2C_InitStructure;

  // Set I2C1 clock to SYSCLK (see system_stm32f0.c)
  RCC_I2CCLKConfig(RCC_I2C1CLK_SYSCLK);

  //(#) Enable peripheral clock using RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2Cx, ENABLE)
  //    function for I2C1 or I2C2.
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_I2C1, ENABLE);

  //(#) Enable SDA, SCL  and SMBA (when used) GPIO clocks using
  //    RCC_AHBPeriphClockCmd() function.
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);

  //(#) Peripherals alternate function:
  //    (++) Connect the pin to the desired peripherals' Alternate
  //         Function (AF) using GPIO_PinAFConfig() function.
  GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_1);
  GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_1);

  //    (++) Configure the desired pin in alternate function by:
  //         GPIO_InitStruct->GPIO_Mode = GPIO_Mode_AF
  GPIO_StructInit(&GPIO_InitStructure);
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6 | GPIO_Pin_7;

  //    (++) Select the type, OpenDrain and speed via
  //         GPIO_PuPd, GPIO_OType and GPIO_Speed members
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_OD;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;

  //    (++) Call GPIO_Init() function.
  GPIO_Init(GPIOB, &GPIO_InitStructure);

  //(#) Program the Mode, Timing , Own address, Ack and Acknowledged Address
  //    using the I2C_Init() function.
  I2C_StructInit(&I2C_InitStructure);
  I2C_InitStructure.I2C_Ack = I2C_Ack_Enable;
  I2C_InitStructure.I2C_AcknowledgedAddress = I2C_AcknowledgedAddress_7bit;
  I2C_InitStructure.I2C_AnalogFilter = I2C_AnalogFilter_Enable;
  I2C_InitStructure.I2C_DigitalFilter = 0;
  I2C_InitStructure.I2C_Mode = I2C_Mode_I2C;
  I2C_InitStructure.I2C_OwnAddress1 = 0;
//I2C_InitStructure.I2C_Timing = 0x00310309; // ~400 kHz. @ 8 MHz (HSI) see Ref. Man. Table 91
//I2C_InitStructure.I2C_Timing = 0x50330309; // ~400 kHz. @ 48 MHz (SYSCLK) see Ref. Man. Table 93
// I2C_InitStructure.I2C_Timing = 0x2033030A; // =400 kHz. @ 48 MHz (SYSCLK) measured with Logic Analyzer
    I2C_InitStructure.I2C_Timing = 0xB0420F13; // =100 kHz. @ 48 MHz (SYSCLK) See Table 93

  I2C_Init(I2C1, &I2C_InitStructure);

  //(#) Optionally you can enable/configure the following parameters without
  //    re-initialization (i.e there is no need to call again I2C_Init() function):
  //    (++) Enable the acknowledge feature using I2C_AcknowledgeConfig() function.
  //    (++) Enable the dual addressing mode using I2C_DualAddressCmd() function.
  //    (++) Enable the general call using the I2C_GeneralCallCmd() function.
  //    (++) Enable the clock stretching using I2C_StretchClockCmd() function.
  //    (++) Enable the PEC Calculation using I2C_CalculatePEC() function.
  //    (++) For SMBus Mode:
  //         (+++) Enable the SMBusAlert pin using I2C_SMBusAlertCmd() function.

  //(#) Enable the NVIC and the corresponding interrupt using the function
  //    I2C_ITConfig() if you need to use interrupt mode.

  //(#) When using the DMA mode
  //   (++) Configure the DMA using DMA_Init() function.
  //   (++) Active the needed channel Request using I2C_DMACmd() function.

  //(#) Enable the I2C using the I2C_Cmd() function.
  I2C_Cmd(I2C1, ENABLE);

  //(#) Enable the DMA using the DMA_Cmd() function when using DMA mode in the
  //    transfers.
}