#include "Spi.h"

void Spi_Init(void)
{
	SPI_InitTypeDef SPI_InitStructure;
    GPIO_InitTypeDef GPIO_InitStructure;
	
	/* Enable GPIO clock */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_AFIO, ENABLE);
	/* Enable SPI clock */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
	
	/* SPI GPIO setup */
	// SPIx SCK and MOSI pin setup
    GPIO_InitStructure.GPIO_Pin = SPIx_SCK | SPIx_MOSI;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(SPIx_GPIO, &GPIO_InitStructure);

    // SPIx MISO pin setup
    GPIO_InitStructure.GPIO_Pin = SPIx_MISO;
    GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_IPU;
    GPIO_Init(SPIx_GPIO, &GPIO_InitStructure);

    // SPIx CS pin setup
    GPIO_InitStructure.GPIO_Pin = SPIx_CS;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(SPIx_CS_GPIO, &GPIO_InitStructure);
	
	// Set CS high
    GPIO_SetBits(SPIx_CS_GPIO, SPIx_CS);
		

    SPI_I2S_DeInit(SPIx);

    // SPIx Mode setup
    SPI_InitStructure.SPI_Direction = SPI_Direction_2Lines_FullDuplex;
    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
    SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
    SPI_InitStructure.SPI_CPOL = SPIx_CPOL;	 
    SPI_InitStructure.SPI_CPHA = SPIx_CPHA;
    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
    SPI_InitStructure.SPI_BaudRatePrescaler = SPIx_PRESCALER_SLOW;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_InitStructure.SPI_CRCPolynomial = 7;

    SPI_Init(SPIx, &SPI_InitStructure);

    // Disable SPIx SS Output
    SPI_SSOutputCmd(SPIx, DISABLE);

    // Enable SPIx
    SPI_Cmd(SPIx, ENABLE);
}


void Spi_ChangePrescaler(uint16_t scaling_factor)
{
    uint16_t tmpreg = 0;

    /* Get the SPIx CR1 value */
    tmpreg = SPIx->CR1;

    /*clear the scaling bits*/
    tmpreg &= 0xFFC7;

    /*set the scaling bits*/
    tmpreg |= scaling_factor;

    /* Write to SPIx CR1 */
    SPIx->CR1 = tmpreg;
}