/* USER CODE BEGIN Header */
/**
 ******************************************************************************
 * @file           : main.c
 * @brief          : Main program body
 ******************************************************************************
 * @attention
 *
 * Copyright (c) 2024 STMicroelectronics.
 * All rights reserved.
 *
 * This software is licensed under terms that can be found in the LICENSE file
 * in the root directory of this software component.
 * If no LICENSE file comes with this software, it is provided AS-IS.
 *
 ******************************************************************************
 */
/* USER CODE END Header */
/* Includes ------------------------------------------------------------------*/
#include "main.h"
#include "dma.h"
#include "i2c.h"
#include "spi.h"
#include "usart.h"
#include "gpio.h"

/* Private includes ----------------------------------------------------------*/
/* USER CODE BEGIN Includes */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "ssd1306.h"
/* USER CODE END Includes */

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

/* USER CODE END PTD */

/* Private define ------------------------------------------------------------*/
/* USER CODE BEGIN PD */

/* USER CODE END PD */

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

/* USER CODE END PM */

/* Private variables ---------------------------------------------------------*/

/* USER CODE BEGIN PV */
uint8_t caliper_data_rx[3];
uint8_t caliper_data_received_flag = 0;
uint16_t caliper_reading_abs;
uint8_t caliper_reading_sign;
float caliper_reading;

char lcd_line[32];
/* USER CODE END PV */

/* Private function prototypes -----------------------------------------------*/
void SystemClock_Config(void);
/* USER CODE BEGIN PFP */

/* USER CODE END PFP */

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

/* 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_DMA_Init();
  MX_USART2_UART_Init();
  MX_I2C1_Init();
  MX_SPI1_Init();
  /* USER CODE BEGIN 2 */

	ssd1306_Init();
	ssd1306_Fill(Black);
	ssd1306_SetCursor(20, 0);
	ssd1306_WriteString("ufnalski.edu.pl", Font_6x8, White);
	ssd1306_SetCursor(8, 12);
	ssd1306_WriteString("Calipers [SPI, DMA]", Font_6x8, White);
	ssd1306_SetCursor(20, 24);
	ssd1306_WriteString("Tyre gauge demo", Font_6x8, White);
	ssd1306_SetCursor(2, 40);
	ssd1306_WriteString("Tyre tread depth:", Font_6x8, White);

	ssd1306_UpdateScreen();

	HAL_SPI_Receive_DMA(&hspi1, caliper_data_rx, 3);
  /* USER CODE END 2 */

  /* Infinite loop */
  /* USER CODE BEGIN WHILE */
	while (1)
	{
		if (caliper_data_received_flag == 1)
		{
			caliper_data_received_flag = 0;
			caliper_reading_abs = (uint16_t) (caliper_data_rx[0])
					| (((uint16_t) (caliper_data_rx[1])) << 8);

			if ((0x00 == caliper_data_rx[2]) || (0x10 == caliper_data_rx[2])) // SI
			{
				caliper_reading_sign = (0x00 == caliper_data_rx[2]); // 0 -; 1 +
				caliper_reading = (((float) caliper_reading_sign) * 2.0 - 1.0)
						* ((float) caliper_reading_abs) / 100.0;
				sprintf(lcd_line, "       %.2f mm    ", caliper_reading);
			}
			else if ((0x80 == caliper_data_rx[2])
					|| (0x90 == caliper_data_rx[2])) // imperial
			{
				caliper_reading_sign = (0x80 == caliper_data_rx[2]); // 0 -; 1 +
				caliper_reading = (((float) caliper_reading_sign) * 2.0 - 1.0)
						* ((float) caliper_reading_abs) / 2000.0;
				sprintf(lcd_line, "       %.4f in      ", caliper_reading);
			}
			else
			{
				sprintf(lcd_line, "       Error!");
			}

			ssd1306_SetCursor(2, 55);
			ssd1306_WriteString(lcd_line, Font_6x8, White);
			ssd1306_UpdateScreen();
			HAL_SPI_Receive_DMA(&hspi1, caliper_data_rx, 3);
		}

    /* 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
  */
  HAL_PWREx_ControlVoltageScaling(PWR_REGULATOR_VOLTAGE_SCALE1_BOOST);

  /** Initializes the RCC Oscillators according to the specified parameters
  * in the RCC_OscInitTypeDef structure.
  */
  RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
  RCC_OscInitStruct.HSIState = RCC_HSI_ON;
  RCC_OscInitStruct.HSICalibrationValue = RCC_HSICALIBRATION_DEFAULT;
  RCC_OscInitStruct.PLL.PLLState = RCC_PLL_ON;
  RCC_OscInitStruct.PLL.PLLSource = RCC_PLLSOURCE_HSI;
  RCC_OscInitStruct.PLL.PLLM = RCC_PLLM_DIV4;
  RCC_OscInitStruct.PLL.PLLN = 85;
  RCC_OscInitStruct.PLL.PLLP = RCC_PLLP_DIV2;
  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();
  }
}

/* USER CODE BEGIN 4 */

void HAL_SPI_RxCpltCallback(SPI_HandleTypeDef *hspi)
{
	if (hspi->Instance == SPI1)
	{
		caliper_data_received_flag = 1;
	}
}

/* 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 */
