#include "main.h"
#include "stm32l100c_discovery.h"
#include "ssd1306.h"

#define LED_POWER GPIOB,GPIO_Pin_9
#define LED_STAT  GPIOA,GPIO_Pin_15

static __IO uint32_t TimingDelay;

void init_gpio();
void init_spi();

int main(void)
{

    // Init clocks
    SystemInit();
    RCC_ClocksTypeDef RCC_Clocks;

    // SysTick end of count event each 1ms
    RCC_GetClocksFreq(&RCC_Clocks);
    SysTick_Config(RCC_Clocks.HCLK_Frequency / 1000);

    GPIO_ResetBits(LED_STAT);
    Delay(100);

    init_gpio();
    init_spi();

    ssd1306_Init();
    ssd1306_DrawPoint(3,3,1);
    ssd1306_DrawPoint(5,5,0);

    GPIO_SetBits(LED_POWER);
    Delay(500);
    GPIO_ResetBits(LED_POWER);

    while(1)
    {  
        ssd1306_DrawPoint(5,5,0);
        GPIO_SetBits(LED_POWER);
        Delay(150);
        GPIO_ResetBits(LED_POWER);
        Delay(150);
    }
}

/**
  * @brief  Inserts a delay time.
  * @param  nTime: specifies the delay time length, in 1 ms.
  * @retval None
  */
void Delay(__IO uint32_t nTime)
{
  TimingDelay = nTime;
  while(TimingDelay != 0);
}

/**
  * @brief  Decrements the TimingDelay variable.
  * @param  None
  * @retval None
  */
void TimingDelay_Decrement(void)
{
  if (TimingDelay != 0x00)
  { 
    TimingDelay--;
  }
}



void init_spi(void)
{
    SPI_InitTypeDef  SPI_InitStructure;

    // OLED IC
    SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Tx;
    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
    SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
    SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
    SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_64;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_InitStructure.SPI_CRCPolynomial = 7;
    SPI_Init(SPI1, &SPI_InitStructure);
    SPI_Cmd(SPI1, ENABLE);           /* Enable the SPI  */   

    // MAX IC
    SPI_InitStructure.SPI_Direction = SPI_Direction_1Line_Rx;
    SPI_InitStructure.SPI_Mode = SPI_Mode_Master;
    SPI_InitStructure.SPI_DataSize = SPI_DataSize_8b;
    SPI_InitStructure.SPI_CPOL = SPI_CPOL_High;
    SPI_InitStructure.SPI_CPHA = SPI_CPHA_2Edge;
    SPI_InitStructure.SPI_NSS = SPI_NSS_Soft;
    SPI_InitStructure.SPI_BaudRatePrescaler = SPI_BaudRatePrescaler_64;
    SPI_InitStructure.SPI_FirstBit = SPI_FirstBit_MSB;
    SPI_InitStructure.SPI_CRCPolynomial = 7;
    SPI_Init(SPI2, &SPI_InitStructure);
    SPI_Cmd(SPI2, ENABLE);           /* Enable the SPI */
}

void init_gpio(void) {

 GPIO_InitTypeDef GPIO_InitStruct;

  // Enable SPI clocks
  RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE);

  // Enable GPIO clocks
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOC|RCC_AHBPeriph_GPIOB|RCC_AHBPeriph_GPIOA, ENABLE);

  // Enable DMA clocks (Is AHB even the right thing???)
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); // EMZ TODO get the right ones

  /*Configure GPIO pin : PC */
  GPIO_InitStruct.GPIO_Pin = GPIO_Pin_13;
  GPIO_InitStruct.GPIO_Mode = GPIO_Mode_OUT;
  GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_400KHz;
  GPIO_Init(GPIOC, &GPIO_InitStruct);

  /*Configure GPIO pin : PB */
  GPIO_InitStruct.GPIO_Pin = GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_10|GPIO_Pin_12 
                          |GPIO_Pin_9;
  GPIO_InitStruct.GPIO_Mode = GPIO_Mode_OUT;
  GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_400KHz;
  GPIO_Init(GPIOB, &GPIO_InitStruct);

  /*Configure GPIO pin : PA */
  GPIO_InitStruct.GPIO_Pin = GPIO_Pin_15;
  GPIO_InitStruct.GPIO_Mode = GPIO_Mode_OUT;
  GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_400KHz;
  GPIO_Init(GPIOA, &GPIO_InitStruct);

  /*Configure GPIO pin : PB */
  GPIO_InitStruct.GPIO_Pin = GPIO_Pin_3|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6 
                          |GPIO_Pin_7;
  GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN;
  GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_Init(GPIOB, &GPIO_InitStruct);

  /** SPI1 GPIO Configuration  
  PA5   ------> SPI1_SCK
  PA7   ------> SPI1_MOSI
  */

  /*Enable or disable the AHB peripheral clock */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

  /*Configure GPIO pin : PA */
  GPIO_InitStruct.GPIO_Pin = GPIO_Pin_5|GPIO_Pin_7;
  GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_400KHz;
  GPIO_Init(GPIOA, &GPIO_InitStruct);

  /*Configure GPIO pin alternate function */
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_SPI1);

  /*Configure GPIO pin alternate function */
  GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_SPI1);

  /** SPI2 GPIO Configuration  
  PB13   ------> SPI2_SCK
  PB14   ------> SPI2_MISO
  PB15   ------> SPI2_MOSI
  */

  /*Enable or disable the AHB peripheral clock */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOB, ENABLE);

  /*Configure GPIO pin : PB */
  GPIO_InitStruct.GPIO_Pin = GPIO_Pin_13|GPIO_Pin_14|GPIO_Pin_15;
  GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_400KHz;
  GPIO_Init(GPIOB, &GPIO_InitStruct);

  /*Configure GPIO pin alternate function */
  GPIO_PinAFConfig(GPIOB, GPIO_PinSource13, GPIO_AF_SPI2);

  /*Configure GPIO pin alternate function */
  GPIO_PinAFConfig(GPIOB, GPIO_PinSource14, GPIO_AF_SPI2);

  /*Configure GPIO pin alternate function */
  GPIO_PinAFConfig(GPIOB, GPIO_PinSource15, GPIO_AF_SPI2);

  /** USB GPIO Configuration  
  PA11   ------> USB_DM
  PA12   ------> USB_DP
  */

  /*Enable or disable the AHB peripheral clock */
  RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOA, ENABLE);

  /*Configure GPIO pin : PA */
  GPIO_InitStruct.GPIO_Pin = GPIO_Pin_11|GPIO_Pin_12;
  GPIO_InitStruct.GPIO_OType = GPIO_OType_PP;
  GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL;
  GPIO_InitStruct.GPIO_Speed = GPIO_Speed_400KHz;
  GPIO_Init(GPIOA, &GPIO_InitStruct);
}





#ifdef  USE_FULL_ASSERT

/**
  * @brief  Reports the name of the source file and the source line number
  *   where the assert_param error has occurred.
  * @param  file: pointer to the source file name
  * @param  line: assert_param error line source number
  * @retval None
  */
void assert_failed(uint8_t* file, uint32_t line)
{ 
  /* User can add his own implementation to report the file name and line number,
     ex: printf("Wrong parameters value: file %s on line %d\r\n", file, line) */

  /* Infinite loop */
  while (1)
  {}
}
#endif

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