text: /* USER CODE BEGIN Header */
  /**
    ******************************************************************************
    * @file           : main.c
    * @brief          : Main program body
    ******************************************************************************
    * @attention
    *
    * <h2><center>&copy; Copyright (c) 2020 STMicroelectronics.
    * All rights reserved.</center></h2>
    *
    * This software component is licensed by ST under BSD 3-Clause license,
    * the "License"; You may not use this file except in compliance with the
    * License. You may obtain a copy of the License at:
    *                        opensource.org/licenses/BSD-3-Clause
    *
    ******************************************************************************
    */
  /* USER CODE END Header */
  
  /* Includes ------------------------------------------------------------------*/
  #include "main.h"
  
  /* Private includes ----------------------------------------------------------*/
  /* USER CODE BEGIN Includes */
  
  /* 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 ---------------------------------------------------------*/
  I2C_HandleTypeDef hi2c1;
  
  SPI_HandleTypeDef hspi1;
  
  UART_HandleTypeDef huart3;
  
  /* USER CODE BEGIN PV */
  
  /* USER CODE END PV */
  
  /* Private function prototypes -----------------------------------------------*/
  void SystemClock_Config(void);
  static void MX_GPIO_Init(void);
  static void MX_I2C1_Init(void);
  static void MX_SPI1_Init(void);
  static void MX_USART3_UART_Init(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)  __attribute__ ((section (".sramcode")));
  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_I2C1_Init();
    MX_SPI1_Init();
    MX_USART3_UART_Init();
    /* USER CODE BEGIN 2 */
  
    /* USER CODE END 2 */
   
  
    /* Infinite loop */
    /* USER CODE BEGIN WHILE */
  
    while (1)
    {
  		//D0, D1: Power, D4: Reset, D2: BOOT0
  		__asm__ volatile("start1: ldr r4, =0x48000c10"); //GPIOD input register
  		__asm__ volatile("ldr r5, =0x48000c00"); //GPIOD MODER
  		__asm__ volatile("ldr r6, =0x48000010"); //GPIOA MODER
  		__asm__ volatile("ldr r7, =0x48000c18"); //GPIOD BSSR
  		__asm__ volatile("ldr r8, =0x48001018"); //GPIOE BSSR
  		__asm__ volatile("mov r0, #3"); //set high PD0+PD1
  		__asm__ volatile("str r0, [r7]");
  		__asm__ volatile("mov r0, #4"); //set high PD2
  		__asm__ volatile("str r0, [r7]");
  		__asm__ volatile("mov r0, #0x0015"); //output PD0+PD1+PD2
  		__asm__ volatile("str r0, [r5]");
  
  		__asm__ volatile("start2: ldr r0, =0x20000000"); //red off
  		__asm__ volatile("str r0, [r8]"); //led off
  
  		//wait for button
  		__asm__ volatile("wbtn: ldr r0, [r6]"); //get inputs
  		__asm__ volatile("ands r0, 0x01");
  		__asm__ volatile("beq wbtn");
  
  		//set LEDs
  		__asm__ volatile("ldr r0, =0x00004000"); //on
  		__asm__ volatile("str r0, [r8]"); //led on
  
  
  		__asm__ volatile("mov r0, #0x30000"); //set low PD0+PD1
  		__asm__ volatile("str r0, [r7]");
  
  		//wait for some time until reset triggers
  		__asm__ volatile("l1: ldr r0, [r4]"); //get inputs
  		__asm__ volatile("ands r0, #0x010");
  		__asm__ volatile("bne l1");
  
  		__asm__ volatile("mov r0, #0x3"); //set high PD0+PD1
  		__asm__ volatile("str r0, [r7]");
  
  		//let the SRAM firmware run
  		__asm__ volatile("mov r1, #0x100000");
  		__asm__ volatile("wait1: subs r1, r1, #1");
  		__asm__ volatile("bne wait1");
  
  		__asm__ volatile("ldr r0, =0x40001000"); //on
  		__asm__ volatile("str r0, [r8]"); //led on
  
  		__asm__ volatile("mov r0, #0x40000"); //set low PD2
  		__asm__ volatile("str r0, [r7]");
  
  		__asm__ volatile("mov r0, #0x100000"); //set low PD4
  		__asm__ volatile("str r0, [r7]");
  		__asm__ volatile("mov r0, #0x0115"); //output PD0+PD1+PD2+PD4
  		__asm__ volatile("str r0, [r5]");
  
  		//wait for reset release
  		__asm__ volatile("mov r1, #0x100000");
  		__asm__ volatile("wait2: subs r1, r1, #1");
  		__asm__ volatile("bne wait2");
  
  		__asm__ volatile("mov r0, #0x0015"); //output PD0+PD1+PD2
  		__asm__ volatile("str r0, [r5]");
  
  
  		//set LEDs
  		__asm__ volatile("ldr r0, =0x10002000"); //red on, blue off
  		__asm__ volatile("str r0, [r8]"); //led off
  
  
  		//let the SRAM firmware run
  		__asm__ volatile("mov r1, #0xF00000");
  		__asm__ volatile("wait3: subs r1, r1, #1");
  		__asm__ volatile("bne wait3");
  
  
  		__asm__ volatile("mov r0, #0x40000"); //set low PD2
  		__asm__ volatile("str r0, [r7]");
  
  		__asm__ volatile("b start2");
  
    }
  
    /* USER CODE END 3 */
  }
  
  /**
    * @brief System Clock Configuration
    * @retval None
    */
  void SystemClock_Config(void)
  {
    RCC_OscInitTypeDef RCC_OscInitStruct = {0};
    RCC_ClkInitTypeDef RCC_ClkInitStruct = {0};
    RCC_PeriphCLKInitTypeDef PeriphClkInit = {0};
  
    /** Initializes the CPU, AHB and APB busses clocks 
    */
    RCC_OscInitStruct.OscillatorType = RCC_OSCILLATORTYPE_HSI;
    RCC_OscInitStruct.HSEState = RCC_HSE_OFF;
    RCC_OscInitStruct.HSEPredivValue = RCC_HSE_PREDIV_DIV1;
    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_HSE;
    RCC_OscInitStruct.PLL.PLLMUL = RCC_PLL_MUL9;
    if (HAL_RCC_OscConfig(&RCC_OscInitStruct) != HAL_OK)
    {
      Error_Handler();
    }
    /** Initializes the CPU, AHB and APB busses 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_DIV2;
    RCC_ClkInitStruct.APB2CLKDivider = RCC_HCLK_DIV1;
  
    if (HAL_RCC_ClockConfig(&RCC_ClkInitStruct, FLASH_LATENCY_2) != HAL_OK)
    {
      Error_Handler();
    }
    PeriphClkInit.PeriphClockSelection = RCC_PERIPHCLK_USART3|RCC_PERIPHCLK_I2C1;
    PeriphClkInit.Usart3ClockSelection = RCC_USART3CLKSOURCE_PCLK1;
    PeriphClkInit.I2c1ClockSelection = RCC_I2C1CLKSOURCE_HSI;
    if (HAL_RCCEx_PeriphCLKConfig(&PeriphClkInit) != HAL_OK)
    {
      Error_Handler();
    }
  }
  
  /**
    * @brief I2C1 Initialization Function
    * @param None
    * @retval None
    */
  static void MX_I2C1_Init(void)
  {
  
    /* USER CODE BEGIN I2C1_Init 0 */
  
    /* USER CODE END I2C1_Init 0 */
  
    /* USER CODE BEGIN I2C1_Init 1 */
  
    /* USER CODE END I2C1_Init 1 */
    hi2c1.Instance = I2C1;
    hi2c1.Init.Timing = 0x2000090E;
    hi2c1.Init.OwnAddress1 = 0;
    hi2c1.Init.AddressingMode = I2C_ADDRESSINGMODE_7BIT;
    hi2c1.Init.DualAddressMode = I2C_DUALADDRESS_DISABLE;
    hi2c1.Init.OwnAddress2 = 0;
    hi2c1.Init.OwnAddress2Masks = I2C_OA2_NOMASK;
    hi2c1.Init.GeneralCallMode = I2C_GENERALCALL_DISABLE;
    hi2c1.Init.NoStretchMode = I2C_NOSTRETCH_DISABLE;
    if (HAL_I2C_Init(&hi2c1) != HAL_OK)
    {
      Error_Handler();
    }
    /** Configure Analogue filter 
    */
    if (HAL_I2CEx_ConfigAnalogFilter(&hi2c1, I2C_ANALOGFILTER_ENABLE) != HAL_OK)
    {
      Error_Handler();
    }
    /** Configure Digital filter 
    */
    if (HAL_I2CEx_ConfigDigitalFilter(&hi2c1, 0) != HAL_OK)
    {
      Error_Handler();
    }
    /* USER CODE BEGIN I2C1_Init 2 */
  
    /* USER CODE END I2C1_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_4BIT;
    hspi1.Init.CLKPolarity = SPI_POLARITY_LOW;
    hspi1.Init.CLKPhase = SPI_PHASE_1EDGE;
    hspi1.Init.NSS = SPI_NSS_SOFT;
    hspi1.Init.BaudRatePrescaler = SPI_BAUDRATEPRESCALER_4;
    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 USART3 Initialization Function
    * @param None
    * @retval None
    */
  static void MX_USART3_UART_Init(void)
  {
  
    /* USER CODE BEGIN USART3_Init 0 */
  
    /* USER CODE END USART3_Init 0 */
  
    /* USER CODE BEGIN USART3_Init 1 */
  
    /* USER CODE END USART3_Init 1 */
    huart3.Instance = USART3;
    huart3.Init.BaudRate = 115200;
    huart3.Init.WordLength = UART_WORDLENGTH_8B;
    huart3.Init.StopBits = UART_STOPBITS_2;
    huart3.Init.Parity = UART_PARITY_NONE;
    huart3.Init.Mode = UART_MODE_TX_RX;
    huart3.Init.HwFlowCtl = UART_HWCONTROL_NONE;
    huart3.Init.OverSampling = UART_OVERSAMPLING_16;
    huart3.Init.OneBitSampling = UART_ONE_BIT_SAMPLE_DISABLE;
    huart3.AdvancedInit.AdvFeatureInit = UART_ADVFEATURE_NO_INIT;
    if (HAL_UART_Init(&huart3) != HAL_OK)
    {
      Error_Handler();
    }
    /* USER CODE BEGIN USART3_Init 2 */
  
    /* USER CODE END USART3_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_GPIOE_CLK_ENABLE();
    __HAL_RCC_GPIOC_CLK_ENABLE();
    __HAL_RCC_GPIOF_CLK_ENABLE();
    __HAL_RCC_GPIOA_CLK_ENABLE();
    __HAL_RCC_GPIOD_CLK_ENABLE();
    __HAL_RCC_GPIOB_CLK_ENABLE();
  
    /*Configure GPIO pin Output Level */
    HAL_GPIO_WritePin(GPIOE, CS_I2C_SPI_Pin|LD4_Pin|LD3_Pin|LD5_Pin 
                            |LD7_Pin|LD9_Pin|LD10_Pin|LD8_Pin, GPIO_PIN_RESET);
  
    /*Configure GPIO pin Output Level */
    HAL_GPIO_WritePin(LD6_GPIO_Port, LD6_Pin, GPIO_PIN_SET);
  
    /*Configure GPIO pins : DRDY_Pin MEMS_INT3_Pin MEMS_INT4_Pin MEMS_INT1_Pin 
                             MEMS_INT2_Pin */
    GPIO_InitStruct.Pin = DRDY_Pin|MEMS_INT3_Pin|MEMS_INT4_Pin|MEMS_INT1_Pin 
                            |MEMS_INT2_Pin;
    GPIO_InitStruct.Mode = GPIO_MODE_EVT_RISING;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);
  
    /*Configure GPIO pins : CS_I2C_SPI_Pin LD4_Pin LD3_Pin LD5_Pin 
                             LD7_Pin LD9_Pin LD10_Pin LD8_Pin 
                             LD6_Pin */
    GPIO_InitStruct.Pin = CS_I2C_SPI_Pin|LD4_Pin|LD3_Pin|LD5_Pin 
                            |LD7_Pin|LD9_Pin|LD10_Pin|LD8_Pin 
                            |LD6_Pin;
    GPIO_InitStruct.Mode = GPIO_MODE_OUTPUT_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_LOW;
    HAL_GPIO_Init(GPIOE, &GPIO_InitStruct);
  
    /*Configure GPIO pin : B1_Pin */
    GPIO_InitStruct.Pin = B1_Pin;
    GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    HAL_GPIO_Init(B1_GPIO_Port, &GPIO_InitStruct);
  
    /*Configure GPIO pins : DM_Pin DP_Pin */
    GPIO_InitStruct.Pin = DM_Pin|DP_Pin;
    GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
    GPIO_InitStruct.Pull = GPIO_NOPULL;
    GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_HIGH;
    GPIO_InitStruct.Alternate = GPIO_AF14_USB;
    HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
  
    /*Configure GPIO pins : PD0 PD1 PD2 PD3 
                             PD4 PD5 PD6 PD7 */
    GPIO_InitStruct.Pin = GPIO_PIN_0|GPIO_PIN_1|GPIO_PIN_2|GPIO_PIN_3 
  		  	  	  	   |GPIO_PIN_4|GPIO_PIN_5|GPIO_PIN_6|GPIO_PIN_7;
    GPIO_InitStruct.Mode = GPIO_MODE_INPUT;
    GPIO_InitStruct.Pull = GPIO_PULLUP;
    HAL_GPIO_Init(GPIOD, &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 */
  
    /* 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(char *file, uint32_t line)
  { 
    /* USER CODE BEGIN 6 */
    /* User can add his own implementation to report the file name and line number,
       tex: 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****/
  