/* USER CODE BEGIN Header */
/**
  ******************************************************************************
  * @file           : main.c
  * @brief          : Main program body
  ******************************************************************************
  *Das Scan-Limit-Register legt fest, wie viele Ziffern angezeigt werden, von 1 bis 8. Sie werden im Multiplexverfahren angezeigt.
  *0xX0 bis 0xX7
  *
  *Dieser Widerstand (ISET) kann entweder fest oder variabel sein, um eine Helligkeitseinstellung über die Frontplatte zu ermöglichen.
  *Die digitale Steuerung der Display-Helligkeit erfolgt über einen internen Pulsweitenmodulator, der unter dem unteren Nibble des Intensitätsregisters gesteuert wird. Der Modulator skaliert den durchschnittlichen Segmentstrom in 16 Schritten.
  *0xX0 bis 0xXF
  *
  *2 Helligkeitsstufen gleichzeitig (wahrscheinlich immer jede zweite LED die angesprochen wird auf eine andere festgelegte Stufe setzen.
  ******************************************************************************
  */

//CLK schick ich zu CLK (Pin 13) an MAX7219
//MISO kriegt von DOUT (Pin 24)
//MOSI schickt an DIN (Pin 1)
//CS (PIN 12)
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include <stdio.h>
/* USER CODE END Includes */

/* Private typedef -----------------------------------------------------------*/
/* USER CODE BEGIN PTD */

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */
/*#define brightness 0xX0


#define CS    4
#define MOSI  7
#define SCK   5
//#define NSS   PB0
/* USER CODE END PD */

/* Private macro -------------------------------------------------------------*/
/* USER CODE BEGIN PM */

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/
RNG_HandleTypeDef hrng;

SPI_HandleTypeDef hspi1;

/* USER CODE BEGIN PV */

/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
static void MX_GPIO_Init(void);
static void MX_RNG_Init(void);
static void MX_SPI1_Init(void);
/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

/* Private user code ---------------------------------------------------------*/
/* USER CODE BEGIN 0 */


/*uint8_t CS = GPIO_PIN_4;
uint8_t MISO = GPIO_PIN_7;
uint8_t SCK = GPIO_PIN_5;*/

void initSPI(){
  RCC->APB2ENR |= (1<<2); //Enable Port A clock
}

void write_byte (uint8_t byte) {
	for(int i = 0; i < 8; i++) {
		HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, 0);  // Pull the CLK LOW
		//HAL_SPI_Transmit_IT(&hspi1, &SCK, 1);
        HAL_GPIO_WritePin(GPIOA, GPIO_PIN_7, byte&0x80);// Write one BIT data MSB first
        //HAL_SPI_Receive_IT(&hspi1, &MISO, 1);
	    byte = byte<<1;  // shift the data to the left
	    HAL_GPIO_WritePin(GPIOA, GPIO_PIN_5, 1);  // Pull the CLK HIGH
	    //HAL_SPI_Transmit_IT(&hspi1, &SCK, 1);
	}
}

void write_max (uint8_t address, uint8_t data) {
	HAL_GPIO_WritePin (GPIOA, GPIO_PIN_4, 0);  // pull the CS pin LOW
	//HAL_SPI_Transmit_IT(&hspi1, &CS, 1);
	//HAL_SPI_Transmit_IT(&hspi1, &address, 1);// Starte SPI Transmit Mode
	//HAL_SPI_Receive_IT(&hspi1, &address, 1);
	write_byte (address);
	//HAL_UART_Transmit_IT(&huart2, &address, 1);
	//HAL_SPI_Transmit_IT(&hspi1, &data, 1);// Starte SPI Transmit Mode
	//HAL_SPI_Receive_IT(&hspi1, &data, 1);
	write_byte (data);
	//HAL_UART_Transmit_IT(&huart2, &data, 1);
	HAL_GPIO_WritePin (GPIOA, GPIO_PIN_4, 1);  // pull the CS pin HIGH
	//HAL_SPI_Transmit_IT(&hspi1, &CS, 1);
}

// function for init

void max_init(void) {
    write_max(0x09, 0x00);       //  no decoding
    write_max(0x0A, 0x03);       //  brightness intensity
    write_max(0x0B, 0x07);       //  scan limit = 8 LEDs
    write_max(0x0C, 0x01);       //  power down =0,normal mode = 1
    write_max(0x0F, 0x01);       //  no test display
}

/* USER CODE END 0 */

/**
  * @brief  The application entry point.
  * @retval int
  */
int main(void)
{
  /* USER CODE BEGIN 1 */

  /* USER CODE END 1 */

  /* MCU Configuration--------------------------------------------------------*/

  /* Reset of all peripherals, Initializes the Flash interface and the Systick. */
  HAL_Init();

  /* USER CODE BEGIN Init */

  /* USER CODE END Init */

  /* Configure the system clock */
  SystemClock_Config();

  /* USER CODE BEGIN SysInit */

  /* USER CODE END SysInit */

  /* Initialize all configured peripherals */
  MX_GPIO_Init();
  MX_RNG_Init();
  MX_SPI1_Init();
  /* USER CODE BEGIN 2 */
  initSPI();
  max_init();

  /* USER CODE END 2 */



  while (1)
  {

    /* USER CODE END WHILE */

    /* USER CODE BEGIN 3 */
  }
  /* USER CODE END 3 */
}

/**
  * @brief System Clock Configuration
  * @retval None
  */
void SystemClock_Config(void)
{
  RCC_OscInitTypeDef RCC_OscInitStruct = {0};
  RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};

  /** Configure the main internal regulator output voltage
  */
  if (HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1) != HAL_OK)
  {
    Error_Handler();
  }
  /** Configure LSE Drive Capability
  */
  HAL_PWR_EnableBkUpAccess();
  __HAL_RCC_LSEDRIVE_CONFIG(RCC_LSEDRIVE_LOW);
  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_LSE|RCC_OSCILLATORTYPE_MSI;
  RCC_OscInitStruct.LSEState = RCC_LSE_ON;
  RCC_OscInitStruct.MSIState = RCC_MSI_ON;
  RCC_OscInitStruct.MSICalibrationValue = 0;
  RCC_OscInitStruct.MSIClockRange = RCC_MSIRANGE_6;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_MSI;
  RCC_OscInitStruct.PLL.PLLM = 1;
  RCC_OscInitStruct.PLL.PLLN = 36;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV7;
  RCC_OscInitStruct.PLL.PLLQ = RCC_PLLQ_DIV2;
  RCC_OscInitStruct.PLL.PLLR = RCC_PLLR_DIV2;
  if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
  {
    Error_Handler();
  }
  /** Initializes the CPU, AHB and APB buses clocks
  */
  RCC_ClkInitStruct.ClockType = RCC_CLOCKTYPE_HCLK|RCC_CLOCKTYPE_SYSCLK
                              |RCC_CLOCKTYPE_PCLK1|RCC_CLOCKTYPE_PCLK2;
  RCC_ClkInitStruct.SYSCLKSource = RCC_SYSCLKSOURCE_PLLCLK;
  RCC_ClkInitStruct.AHBCLKDivider = RCC_SYSCLK_DIV1;
  RCC_ClkInitStruct.APB1CLKDivider = RCC_HCLK_DIV1;
  RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;

  if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_4) != HAL_OK)
  {
    Error_Handler();
  }
  /** Enable MSI Auto calibration
  */
  HAL_RCCEx_EnableMSIPLLMode();
}

/**
  * @brief RNG Initialization Function
  * @param None
  * @retval None
  */
static void MX_RNG_Init(void)
{

  /* USER CODE BEGIN RNG_Init 0 */

  /* USER CODE END RNG_Init 0 */

  /* USER CODE BEGIN RNG_Init 1 */

  /* USER CODE END RNG_Init 1 */
  hrng.Instance = RNG;
  if (HAL_RNG_Init(&hrng) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN RNG_Init 2 */

  /* USER CODE END RNG_Init 2 */

}

/**
  * @brief SPI1 Initialization Function
  * @param None
  * @retval None
  */
static void MX_SPI1_Init(void)
{

  /* USER CODE BEGIN SPI1_Init 0 */

  /* USER CODE END SPI1_Init 0 */

  /* USER CODE BEGIN SPI1_Init 1 */

  /* USER CODE END SPI1_Init 1 */
  /* SPI1 parameter configuration*/
  hspi1.Instance = SPI1;
  hspi1.Init.Mode = SPI_MODE_MASTER;
  hspi1.Init.Direction = SPI_DIRECTION_2LINES;
  hspi1.Init.DataSize = SPI_DATASIZE_8BIT;
  hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
  hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
  hspi1.Init.NSS = SPI_NSS_HARD_OUTPUT;
  hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_8;
  hspi1.Init.FirstBit = SPI_FIRSTBIT_MSB;
  hspi1.Init.TIMode = SPI_TIMODE_DISABLE;
  hspi1.Init.CRCCalculation = SPI_CRCCALCULATION_DISABLE;
  hspi1.Init.CRCPolynomial = 7;
  hspi1.Init.CRCLength = SPI_CRC_LENGTH_DATASIZE;
  hspi1.Init.NSSPMode = SPI_NSS_PULSE_ENABLE;
  if (HAL_SPI_Init(&hspi1) != HAL_OK)
  {
    Error_Handler();
  }
  /* USER CODE BEGIN SPI1_Init 2 */

  /* USER CODE END SPI1_Init 2 */

}

/**
  * @brief GPIO Initialization Function
  * @param None
  * @retval None
  */
static void MX_GPIO_Init(void)
{
  GPIO_InitTypeDef GPIO_InitStruct = {0};

  /* GPIO Ports Clock Enable */
  __HAL_RCC_GPIOC_CLK_ENABLE();
  __HAL_RCC_GPIOA_CLK_ENABLE();
  __HAL_RCC_GPIOB_CLK_ENABLE();

  /*Configure GPIO pin Output Level */
  HAL_GPIO_WritePin(CS_GPIO_Port, CS_Pin, GPIO_PIN_RESET);

  /*Configure GPIO pin : CS_Pin */
  GPIO_InitStruct.Pin = CS_Pin;
  GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
  GPIO_InitStruct.Pull = GPIO_NOPULL;
  GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
  HAL_GPIO_Init(CS_GPIO_Port, &GPIO_InitStruct);

}

/* USER CODE BEGIN 4 */

/* USER CODE END 4 */

/**
  * @brief  This function is executed in case of error occurrence.
  * @retval None
  */
void Error_Handler(void)
{
  /* USER CODE BEGIN Error_Handler_Debug */
  /* User can add his own implementation to report the HAL error return state */
  __disable_irq();
  while (1)
  {
  }
  /* USER CODE END Error_Handler_Debug */
}

#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 CODE BEGIN 6 */
  /* 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) */
  /* USER CODE END 6 */
}
#endif /* USE_FULL_ASSERT */

/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/