/* InitializePeriph() prepares all of the STM32's peripherals for this project
 * Required peripherals are GPIO and USART
 * NVIC assigns an interrupt service routine to an incoming USART message
 */
void InitializePeriph(){
	RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
	RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOD, ENABLE);

	// Set GPIO pins Alt. Function to USART1
    GPIO_PinAFConfig(GPIOC, GPIO_PinSource11, GPIO_AF_USART3);
    GPIO_PinAFConfig(GPIOC, GPIO_PinSource10, GPIO_AF_USART3);

	// PC10: USART TX, PC11: USART RX
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11 + GPIO_Pin_10;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
	GPIO_Init(GPIOC, &GPIO_InitStructure);

	// PD12, PD13, PD14: Outputs for R, G, B
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_12 + GPIO_Pin_13 + GPIO_Pin_14;
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
	GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
	GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
	GPIO_Init(GPIOD, &GPIO_InitStructure);

	// Initialize USART
	USART_InitStructure.USART_BaudRate = 9600;
	USART_InitStructure.USART_Mode = USART_Mode_Tx | USART_Mode_Rx;
	USART_InitStructure.USART_Parity = USART_Parity_No;
	USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
	USART_InitStructure.USART_WordLength = USART_WordLength_8b;
	USART_InitStructure.USART_StopBits = USART_StopBits_1;
    USART_Init(USART3, &USART_InitStructure);
    USART_Cmd(USART3,ENABLE);

    // Assign NVIC to USART3
    NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_Init(&NVIC_InitStructure);
    USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
}