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+/************************************************************************************//**
 * \file         Demo\ARMCM3_STM32_Olimex_STM32P103_GCC\Boot\main.c
 * \brief        Bootloader application source file.
 * \ingroup      Boot_ARMCM3_STM32_Olimex_STM32P103_GCC
 * \internal
 *----------------------------------------------------------------------------------------
 *                          C O P Y R I G H T
 *----------------------------------------------------------------------------------------
 *   Copyright (c) 2012  by Feaser    http://www.feaser.com    All rights reserved
+*
 *----------------------------------------------------------------------------------------
 *                            L I C E N S E
 *----------------------------------------------------------------------------------------
 * This file is part of OpenBLT. OpenBLT is free software: you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as published by the Free
 * Software Foundation, either version 3 of the License, or (at your option) any later
 * version.
+*
 * OpenBLT is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
 * without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
 * PURPOSE. See the GNU General Public License for more details.
+*
 * You should have received a copy of the GNU General Public License along with OpenBLT.
 * If not, see <http://www.gnu.org/licenses/>.
+*
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+* A special exception to the GPL is included to allow you to distribute a combined work
 * that includes OpenBLT without being obliged to provide the source code for any
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+* proprietary components. The exception text is included at the bottom of the license
 * file <license.html>.
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+            Thomas Schöpping
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+* \endinternal
 ****************************************************************************************/
 /****************************************************************************************
 * Include files
 ****************************************************************************************/
 #include "boot.h"                                /* bootloader generic header          */
 #include "timer.h"
 #include "ARMCM3_STM32/types.h"
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+#include "AMiRo/amiroblt.h"
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+#include "helper.h"
-ad5212
+#include "iodef.h"
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+            Thomas Schöpping
 /****************************************************************************************
 * Defines
 ****************************************************************************************/
 #define RESET_TIMEOUT_MS    100
 /****************************************************************************************
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+* Function prototypes and static variables
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+****************************************************************************************/
 static void Init(void);
 static void initGpio();
 static void initExti();
 void configGpioForShutdown();
 ErrorStatus handleColdReset();
 ErrorStatus handleUartWakeup();
 ErrorStatus handleAccelWakeup();
 ErrorStatus shutdownDisambiguationProcedure(const uint8_t type);
 void shutdownToTransportation(const blt_bool exec_disambiguation);
 void shutdownToDeepsleep(const blt_bool exec_disambiguation);
 void shutdownToHibernate(const blt_bool exec_disambiguation);
 void shutdownAndRestart(const blt_bool exec_disambiguation);
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+volatile blBackupRegister_t backup_reg;
-            69661903
+            Thomas Schöpping
 /****************************************************************************************
 * Callback configuration
 ****************************************************************************************/
 void blCallbackShutdownTransportation(void);
 void blCallbackShutdownDeepsleep(void);
 void blCallbackShutdownHibernate(void);
 void blCallbackShutdownRestart(void);
 void blCallbackHandleShutdownRequest(void);
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+const blCallbackTable_t cbtable __attribute__ ((section ("_callback_table"))) = {
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+  .magicNumber = BL_MAGIC_NUMBER,
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+  .vBootloader = {BL_VERSION_ID_AMiRoBLT_Beta, BL_VERSION_MAJOR, BL_VERSION_MINOR, 3},
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+  .vSSSP = {BL_VERSION_ID_SSSP, BL_SSSP_VERSION_MAJOR, BL_SSSP_VERSION_MINOR, 0},
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+  .vCompiler = {BL_VERSION_ID_GCC, __GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__},  // currently only GCC is supported
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+  .cbShutdownHibernate = blCallbackShutdownHibernate,
   .cbShutdownDeepsleep = blCallbackShutdownDeepsleep,
   .cbShutdownTransportation = blCallbackShutdownTransportation,
   .cbShutdownRestart = blCallbackShutdownRestart,
   .cbHandleShutdownRequest = blCallbackHandleShutdownRequest,
   .cb5 = (void*)0,
   .cb6 = (void*)0,
   .cb7 = (void*)0,
   .cb8 = (void*)0,
   .cb9 = (void*)0,
   .cb10 = (void*)0,
   .cb11 = (void*)0
 };
 /************************************************************************************//**
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+** \brief     This is the entry point for the bootloader application and is called
-            69661903
+**            by the reset interrupt vector after the C-startup routines executed.
 ** \return    Program return code.
 **
 ****************************************************************************************/
 int main(void)
+{
   /* initialize the microcontroller */
   Init();
   /* activate some required clocks */
   RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD, ENABLE);
   /* initialize GPIOs and EXTI lines */
   initGpio();
   setLed(BLT_TRUE);
   initExti();
   /* initialize the timer */
   TimerInit();
   /* detect the primary reason for this wakeup/restart */
   backup_reg.wakeup_pri_reason =
       ((RCC_GetFlagStatus(RCC_FLAG_LPWRRST) == SET) ? BL_WAKEUP_PRI_RSN_LPWRRST : 0) |
       ((RCC_GetFlagStatus(RCC_FLAG_WWDGRST) == SET) ? BL_WAKEUP_PRI_RSN_WWDGRST : 0) |
       ((RCC_GetFlagStatus(RCC_FLAG_IWDGRST) == SET) ? BL_WAKEUP_PRI_RSN_IWDGRST : 0) |
       ((RCC_GetFlagStatus(RCC_FLAG_SFTRST) == SET) ? BL_WAKEUP_PRI_RSN_SFTRST : 0)   |
       ((RCC_GetFlagStatus(RCC_FLAG_PORRST) == SET) ? BL_WAKEUP_PRI_RSN_PORRST : 0)   |
       ((RCC_GetFlagStatus(RCC_FLAG_PINRST) == SET) ? BL_WAKEUP_PRI_RSN_PINRST : 0)   |
       ((PWR_GetFlagStatus(PWR_FLAG_WU) == SET) ? BL_WAKEUP_PRI_RSN_WKUP : 0);
   /* when woken from standby mode, detect the secondary reason for thiswakeup/reset */
   if ( (backup_reg.wakeup_pri_reason & BL_WAKEUP_PRI_RSN_WKUP) && (PWR_GetFlagStatus(PWR_FLAG_SB) == SET) ) {
     if (GPIO_ReadInputDataBit(SYS_UART_UP_GPIO, SYS_UART_UP_PIN) == Bit_SET) {
       backup_reg.wakeup_sec_reason = BL_WAKEUP_SEC_RSN_UART;
     } else {
       backup_reg.wakeup_sec_reason = BL_WAKEUP_SEC_RSN_ACCEL;
+    }
   } else {
     backup_reg.wakeup_sec_reason = BL_WAKEUP_SEC_RSN_UNKNOWN;
+  }
   /* clear the flags */
   RCC_ClearFlag();
   PWR_ClearFlag(PWR_FLAG_WU);
   setLed(BLT_FALSE);
   /* wait 1ms for all signals to become stable */
   msleep(1);
   /* handle different wakeup/reset reasons */
   ErrorStatus status = ERROR;
   if (backup_reg.wakeup_pri_reason & BL_WAKEUP_PRI_RSN_WKUP) {
     /* the system was woken via WKUP pin */
     /* differenciate between two wakeup types */
     switch (backup_reg.wakeup_sec_reason) {
       case BL_WAKEUP_SEC_RSN_UART:
         status = handleUartWakeup();
         break;
       case BL_WAKEUP_SEC_RSN_ACCEL:
         status = handleAccelWakeup();
         break;
       default:
         status = ERROR;
         break;
+    }
   } else if (backup_reg.wakeup_pri_reason & BL_WAKEUP_PRI_RSN_PINRST) {
     /* system was woken via NRST pin */
     status = handleColdReset();
   } else {
     /* system was woken/reset for an unexpected reason */
     blinkSOS(1);
     status = handleColdReset();
+  }
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+  /* if something went wrong, signal this failure */
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+  if (status != SUCCESS) {
     blinkSOSinf();
+  }
   return 0;
 } /*** end of main ***/
 /************************************************************************************//**
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+** \brief     Initializes the microcontroller.
-            69661903
+** \return    none.
 **
 ****************************************************************************************/
 static void Init(void)
+{
   volatile blt_int32u StartUpCounter = 0, HSEStatus = 0;
   blt_int32u pll_multiplier;
 #if (BOOT_FILE_LOGGING_ENABLE > 0) && (BOOT_COM_UART_ENABLE == 0)
   GPIO_InitTypeDef  GPIO_InitStruct;
-d0567
+  USART_InitTypeDef USART_InitStruct;
 #endif
-            69661903
+            Thomas Schöpping
   /* reset the RCC clock configuration to the default reset state (for debug purpose) */
   /* set HSION bit */
   RCC->CR |= (blt_int32u)0x00000001;
   /* reset SW, HPRE, PPRE1, PPRE2, ADCPRE and MCO bits */
   RCC->CFGR &= (blt_int32u)0xF8FF0000;
   /* reset HSEON, CSSON and PLLON bits */
   RCC->CR &= (blt_int32u)0xFEF6FFFF;
   /* reset HSEBYP bit */
   RCC->CR &= (blt_int32u)0xFFFBFFFF;
   /* reset PLLSRC, PLLXTPRE, PLLMUL and USBPRE/OTGFSPRE bits */
   RCC->CFGR &= (blt_int32u)0xFF80FFFF;
   /* disable all interrupts and clear pending bits  */
   RCC->CIR = 0x009F0000;
-d0567
+  /* enable HSE */
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+  RCC->CR |= ((blt_int32u)RCC_CR_HSEON);
   /* wait till HSE is ready and if Time out is reached exit */
   do
+  {
     HSEStatus = RCC->CR & RCC_CR_HSERDY;
-d0567
+    StartUpCounter++;
+  }
-            69661903
+  while((HSEStatus == 0) && (StartUpCounter != 1500));
   /* check if time out was reached */
   if ((RCC->CR & RCC_CR_HSERDY) == RESET)
+  {
     /* cannot continue when HSE is not ready */
     ASSERT_RT(BLT_FALSE);
+  }
   /* enable flash prefetch buffer */
   FLASH->ACR |= FLASH_ACR_PRFTBE;
   /* reset flash wait state configuration to default 0 wait states */
   FLASH->ACR &= (blt_int32u)((blt_int32u)~FLASH_ACR_LATENCY);
 #if (BOOT_CPU_SYSTEM_SPEED_KHZ > 48000)
   /* configure 2 flash wait states */
-d0567
+  FLASH->ACR |= (blt_int32u)FLASH_ACR_LATENCY_2;
 #elif (BOOT_CPU_SYSTEM_SPEED_KHZ > 24000)
-            69661903
+  /* configure 1 flash wait states */
-d0567
+  FLASH->ACR |= (blt_int32u)FLASH_ACR_LATENCY_1;
-            69661903
+#endif
   /* HCLK = SYSCLK */
   RCC->CFGR |= (blt_int32u)RCC_CFGR_HPRE_DIV1;
   /* PCLK2 = HCLK/2 */
   RCC->CFGR |= (blt_int32u)RCC_CFGR_PPRE2_DIV2;
   /* PCLK1 = HCLK/2 */
   RCC->CFGR |= (blt_int32u)RCC_CFGR_PPRE1_DIV2;
   /* reset PLL configuration */
   RCC->CFGR &= (blt_int32u)((blt_int32u)~(RCC_CFGR_PLLSRC | RCC_CFGR_PLLXTPRE | \
                                           RCC_CFGR_PLLMULL));
   /* assert that the pll_multiplier is between 2 and 16 */
   ASSERT_CT((BOOT_CPU_SYSTEM_SPEED_KHZ/BOOT_CPU_XTAL_SPEED_KHZ) >= 2);
   ASSERT_CT((BOOT_CPU_SYSTEM_SPEED_KHZ/BOOT_CPU_XTAL_SPEED_KHZ) <= 16);
   /* calculate multiplier value */
   pll_multiplier = BOOT_CPU_SYSTEM_SPEED_KHZ/BOOT_CPU_XTAL_SPEED_KHZ;
   /* convert to register value */
   pll_multiplier = (blt_int32u)((pll_multiplier - 2) << 18);
   /* set the PLL multiplier and clock source */
   RCC->CFGR |= (blt_int32u)(RCC_CFGR_PLLSRC_HSE | pll_multiplier);
   /* enable PLL */
   RCC->CR |= RCC_CR_PLLON;
   /* wait till PLL is ready */
   while((RCC->CR & RCC_CR_PLLRDY) == 0)
+  {
+  }
   /* select PLL as system clock source */
   RCC->CFGR &= (blt_int32u)((blt_int32u)~(RCC_CFGR_SW));
-d0567
+  RCC->CFGR |= (blt_int32u)RCC_CFGR_SW_PLL;
-            69661903
+  /* wait till PLL is used as system clock source */
   while ((RCC->CFGR & (blt_int32u)RCC_CFGR_SWS) != (blt_int32u)0x08)
+  {
+  }
   /* remap JTAG pins */
   RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
   AFIO->MAPR &= ~(blt_int32u)((blt_int32u)0x7 << 24);
   AFIO->MAPR |=  (blt_int32u)((blt_int32u)0x2 << 24);
   /* all input */
 #if (BOOT_COM_CAN_ENABLE > 0 || BOOT_GATE_CAN_ENABLE > 0)
   /* enable clocks for CAN transmitter and receiver pins (GPIOB and AFIO) */
   RCC->APB2ENR |= (blt_int32u)(0x00000004 | 0x00000001);
   /* configure CAN Rx (GPIOA11) as alternate function input */
   /* first reset the configuration */
   GPIOA->CRH &= ~(blt_int32u)((blt_int32u)0xf << 12);
   /* CNF8[1:0] = %01 and MODE8[1:0] = %00 */
   GPIOA->CRH |= (blt_int32u)((blt_int32u)0x4 << 12);
   /* configure CAN Tx (GPIOA12) as alternate function push-pull */
   /* first reset the configuration */
   GPIOA->CRH &= ~(blt_int32u)((blt_int32u)0xf << 16);
   /* CNF9[1:0] = %11 and MODE9[1:0] = %11 */
   GPIOA->CRH |= (blt_int32u)((blt_int32u)0xb << 16);
   /* remap CAN1 pins to PortA */
   AFIO->MAPR &= ~(blt_int32u)((blt_int32u)0x3 << 13);
   AFIO->MAPR |=  (blt_int32u)((blt_int32u)0x0 << 13);
 #endif
 #if (BOOT_COM_UART_ENABLE > 0 || BOOT_GATE_UART_ENABLE > 0)
   /* enable clocks for USART1 peripheral, transmitter and receiver pins (GPIOA and AFIO) */
   RCC->APB2ENR |= (blt_int32u)(0x00004000 | 0x00000004 | 0x00000001);
   /* configure USART1 Tx (GPIOA9) as alternate function push-pull */
   /* first reset the configuration */
   GPIOA->CRH &= ~(blt_int32u)((blt_int32u)0xf << 4);
   /* CNF2[1:0] = %10 and MODE2[1:0] = %11 */
   GPIOA->CRH |= (blt_int32u)((blt_int32u)0xb << 4);
   /* configure USART1 Rx (GPIOA10) as alternate function input floating */
   /* first reset the configuration */
   GPIOA->CRH &= ~(blt_int32u)((blt_int32u)0xf << 8);
   /* CNF2[1:0] = %01 and MODE2[1:0] = %00 */
   GPIOA->CRH |= (blt_int32u)((blt_int32u)0x4 << 8);
 #endif
 } /*** end of Init ***/
 /*
  * Initializes all GPIO used by the bootloader
  */
 static void initGpio() {
   GPIO_InitTypeDef gpio_init;
   /*
    * OUTPUTS
    */
   /* initialize LED and push it up (inactive) */
   GPIO_SetBits(LED_GPIO, LED_PIN);
   gpio_init.GPIO_Pin    = LED_PIN;
   gpio_init.GPIO_Mode   = GPIO_Mode_Out_PP;
   gpio_init.GPIO_Speed  = GPIO_Speed_50MHz;
   GPIO_Init(LED_GPIO, &gpio_init);
   /* initialize SYS_PD_N and let it go (inactive) */
   GPIO_SetBits(SYS_PD_N_GPIO, SYS_PD_N_PIN);
   gpio_init.GPIO_Pin    = SYS_PD_N_PIN;
   gpio_init.GPIO_Mode   = GPIO_Mode_Out_OD;
   gpio_init.GPIO_Speed  = GPIO_Speed_50MHz;
   GPIO_Init(SYS_PD_N_GPIO, &gpio_init);
   /* initialize SYS_SYNC_N and pull it down (active) */
   GPIO_ResetBits(SYS_SYNC_N_GPIO, SYS_SYNC_N_PIN);
   gpio_init.GPIO_Pin    = SYS_SYNC_N_PIN;
   gpio_init.GPIO_Mode   = GPIO_Mode_Out_OD;
   gpio_init.GPIO_Speed  = GPIO_Speed_50MHz;
   GPIO_Init(SYS_SYNC_N_GPIO, &gpio_init);
   /* initialize SYS_WARMST_N and let it go (active) */
   GPIO_SetBits(SYS_WARMRST_N_GPIO, SYS_WARMRST_N_PIN);
   gpio_init.GPIO_Pin    = SYS_WARMRST_N_PIN;
   gpio_init.GPIO_Mode   = GPIO_Mode_Out_OD;
   gpio_init.GPIO_Speed  = GPIO_Speed_50MHz;
   GPIO_Init(SYS_WARMRST_N_GPIO, &gpio_init);
   /* initialize SYS_UART_UP and let it go (inactive) */
   GPIO_SetBits(SYS_UART_UP_GPIO, SYS_UART_UP_PIN);
   gpio_init.GPIO_Pin    = SYS_UART_UP_PIN;
   gpio_init.GPIO_Mode   = GPIO_Mode_Out_OD;
   gpio_init.GPIO_Speed  = GPIO_Speed_50MHz;
   GPIO_Init(SYS_UART_UP_GPIO, &gpio_init);
   /* initialize PATH_DCEN and pull it down (inactive) */
   GPIO_ResetBits(PATH_DCEN_GPIO, PATH_DCEN_PIN);
   gpio_init.GPIO_Pin    = PATH_DCEN_PIN;
   gpio_init.GPIO_Mode   = GPIO_Mode_Out_PP;
   gpio_init.GPIO_Speed  = GPIO_Speed_50MHz;
   GPIO_Init(PATH_DCEN_GPIO, &gpio_init);
   /*
    * INPUTS
    */
   /* initialize the input ACCEL_INT_N */
   gpio_init.GPIO_Pin    = ACCEL_INT_N_PIN;
   gpio_init.GPIO_Mode   = GPIO_Mode_IN_FLOATING;
   gpio_init.GPIO_Speed  = GPIO_Speed_50MHz;
   GPIO_Init(ACCEL_INT_N_GPIO, &gpio_init);
   return;
 } /*** end of initGpio ***/
 /*
  * Initialize all EXTI lines
  */
 static void initExti() {
   /* configure EXTI lines */
   GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource1); // SYS_SYNC_N
   GPIO_EXTILineConfig(GPIO_PortSourceGPIOD, GPIO_PinSource2); // SYS_WARMRST_N
   GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource3); // PATH_DCSTAT
   GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource5); // COMPASS_DRDY
   GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource8); // SYS_PD_N
   GPIO_EXTILineConfig(GPIO_PortSourceGPIOC, GPIO_PinSource9); // SYS_REG_EN
   GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource12); // IR_INT
   GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource13); // GYRO_DRDY
   GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource14); // SYS_UART_UP
   GPIO_EXTILineConfig(GPIO_PortSourceGPIOB, GPIO_PinSource15); // ACCEL_INT_N
   return;
-            f7d2c786
+} /*** end of initExti ***/
-            69661903
+            Thomas Schöpping
 /*
  * Signals, which type of low-power mode the system shall enter after the shutdown sequence.
  */
 ErrorStatus shutdownDisambiguationProcedure(const uint8_t type) {
   GPIO_SetBits(SYS_SYNC_N_GPIO, SYS_SYNC_N_PIN);
   ErrorStatus ret_val = ERROR;
   switch (type) {
     case BL_SHUTDOWN_PRI_RSN_UNKNOWN:
     case BL_SHUTDOWN_PRI_RSN_HIBERNATE:
     case BL_SHUTDOWN_PRI_RSN_DEEPSLEEP:
     case BL_SHUTDOWN_PRI_RSN_TRANSPORT:
+    {
       // broadcast a number of pulses, depending on the argument
       uint8_t pulse_counter = 0;
       for (pulse_counter = 0; pulse_counter < type; ++pulse_counter) {
         msleep(1);
         GPIO_ResetBits(SYS_SYNC_N_GPIO, SYS_SYNC_N_PIN);
         msleep(1);
         GPIO_SetBits(SYS_SYNC_N_GPIO, SYS_SYNC_N_PIN);
+      }
       // wait for timeout
       msleep(10);
       ret_val = SUCCESS;
       break;
+    }
     case BL_SHUTDOWN_PRI_RSN_RESTART:
+    {
       // since there is no ambiguity for restart requests, no pulses are generated
       msleep(10);
       ret_val = SUCCESS;
       break;
+    }
     default:
       ret_val = ERROR;
       break;
+  }
   return ret_val;
 } /*** end of shutdownDisambiguationProcedure ***/
 /*
  * Final shutdown of the system to enter transportation mode.
  */
 void shutdownToTransportation(const blt_bool exec_disambiguation) {
   /* configure some criticpal GPIOs as input
    * This is required, because otherwise some hardware might be powered through these signals */
   configGpioForShutdown();
   /* turn off the motors */
   GPIO_ResetBits(POWER_EN_GPIO, POWER_EN_PIN);
   /* deactivate the WKUP pin */
   PWR_WakeUpPinCmd(DISABLE);
   /* deactivate any RTC related events */
   RTC_ITConfig(RTC_IT_ALR | RTC_IT_OW | RTC_IT_SEC, DISABLE);
   RTC_ClearFlag(~0);
   /* disable the IWDG */
   IWDG_ReloadCounter();
   /* wait for all boards to be ready for shutdown */
   GPIO_SetBits(SYS_SYNC_N_GPIO, SYS_SYNC_N_PIN);
   if (GPIO_ReadInputDataBit(SYS_REG_EN_GPIO, SYS_REG_EN_PIN) == Bit_SET) {
-            fc7151bb
+    // this must be skipped if the pullup voltage (VIO3.3) is not active
-            69661903
+    setLed(BLT_TRUE);
     waitForSignal(SYS_SYNC_N_GPIO, SYS_SYNC_N_PIN, Bit_SET);
     setLed(BLT_FALSE);
+  }
   if (exec_disambiguation == BLT_TRUE) {
     /* execute disambiguation procedure and signal all modules to enter transportation mode */
     if (shutdownDisambiguationProcedure(BL_SHUTDOWN_PRI_RSN_TRANSPORT) != SUCCESS) {
       blinkSOS(1);
       msleep(10);
+    }
+  }
   /* morse 'OK' via the LED to signal that shutdown was successful */
   blinkOK(1);
   /* enter standby mode */
   PWR_EnterSTANDBYMode();
   return;
 } /*** end of shutdownToTransportation ***/
 /*
-            f7d2c786
+ * Final shutdown of the system to enter deepsleep mode.
-            69661903
+ */
 void shutdownToDeepsleep(const blt_bool exec_disambiguation) {
   /* configure some criticpal GPIOs as input
    * This is required, because otherwise some hardware might be powered through these signals */
   configGpioForShutdown();
   /* turn off the motors */
   GPIO_ResetBits(POWER_EN_GPIO, POWER_EN_PIN);
   /* deactivate the WKUP pin */
   PWR_WakeUpPinCmd(ENABLE);
   /*
    * Configuration of RTC and IWDG belongs to the OS.
    */
   /* wait for all boards to be ready for shutdown */
   GPIO_SetBits(SYS_SYNC_N_GPIO, SYS_SYNC_N_PIN);
   if (GPIO_ReadInputDataBit(SYS_REG_EN_GPIO, SYS_REG_EN_PIN) == Bit_SET) {
-            fc7151bb
+    // this must be skipped if the pullup voltage (VIO3.3) is not active
-            69661903
+    setLed(BLT_TRUE);
     waitForSignal(SYS_SYNC_N_GPIO, SYS_SYNC_N_PIN, Bit_SET);
     setLed(BLT_FALSE);
+  }
   if (exec_disambiguation == BLT_TRUE) {
     /* execute disambiguation procedure and signal all modules to enter deepsleep mode */
     if (shutdownDisambiguationProcedure(BL_SHUTDOWN_PRI_RSN_DEEPSLEEP) != SUCCESS) {
       blinkSOS(1);
       msleep(10);
+    }
+  }
   /* morse 'OK' via the LED to signal that shutdown was successful */
   blinkOK(1);
   /* enter standby mode */
   PWR_EnterSTANDBYMode();
   return;
 } /*** end of shutdownToDeepsleep ***/
 /*
  * Final shutdown of the system to enter hibernate mode.
  */
 void shutdownToHibernate(const blt_bool exec_disambiguation) {
   /* configure some criticpal GPIOs as input
    * This is required, because otherwise some hardware might be powered through these signals */
   configGpioForShutdown();
   /* turn off the motors */
   GPIO_ResetBits(POWER_EN_GPIO, POWER_EN_PIN);
   /* deactivate the WKUP pin */
   PWR_WakeUpPinCmd(ENABLE);
   /*
    * Configuration of RTC and IWDG belongs to the OS.
    */
   /* wait for all boards to be ready for shutdown */
   GPIO_SetBits(SYS_SYNC_N_GPIO, SYS_SYNC_N_PIN);
   if (GPIO_ReadInputDataBit(SYS_REG_EN_GPIO, SYS_REG_EN_PIN) == Bit_SET) {
-            fc7151bb
+    // this must be skipped if the pullup voltage (VIO3.3) is not active
-            69661903
+    setLed(BLT_TRUE);
     waitForSignal(SYS_SYNC_N_GPIO, SYS_SYNC_N_PIN, Bit_SET);
     setLed(BLT_FALSE);
+  }
   if (exec_disambiguation == BLT_TRUE) {
     /* execute disambiguation procedure and signal all modules to enter deepsleep mode */
     if (shutdownDisambiguationProcedure(BL_SHUTDOWN_PRI_RSN_HIBERNATE) != SUCCESS) {
       blinkSOS(1);
       msleep(10);
+    }
+  }
   /* morse 'OK' via the LED to signal that shutdown was successful */
   blinkOK(1);
   /* enter standby mode */
   PWR_EnterSTANDBYMode();
   return;
-            fc7151bb
+} /*** end of shutdownToHibernate ***/
-            69661903
+            Thomas Schöpping
 /*
  * Final shutdown of the system and restart.
  */
 void shutdownAndRestart(const blt_bool exec_disambiguation) {
   /* configure some criticpal GPIOs as input
    * This is required, because otherwise some hardware might be powered through these signals */
   configGpioForShutdown();
   /* turn off the motors */
   GPIO_ResetBits(POWER_EN_GPIO, POWER_EN_PIN);
   /* prepare for low-power mode */
   PWR_WakeUpPinCmd(DISABLE); // disable WKUP pin
   RTC_ITConfig(RTC_IT_ALR | RTC_IT_OW | RTC_IT_SEC, DISABLE); // unset RTC events
   RTC_ClearFlag(~0); // clear pending RTC events
   IWDG_ReloadCounter(); // disable IWDG
   /* wait for all boards to be ready for shutdown */
   GPIO_SetBits(SYS_SYNC_N_GPIO, SYS_SYNC_N_PIN);
   if (GPIO_ReadInputDataBit(SYS_REG_EN_GPIO, SYS_REG_EN_PIN) == Bit_SET) {
-            fc7151bb
+    // this must be skipped if the pullup voltage (VIO3.3) is not active
-            69661903
+    setLed(BLT_TRUE);
     waitForSignal(SYS_SYNC_N_GPIO, SYS_SYNC_N_PIN, Bit_SET);
     setLed(BLT_FALSE);
+  }
   if (exec_disambiguation == BLT_TRUE) {
     /* execute disambiguation procedure and signal all modules to restart in default mode */
     if (shutdownDisambiguationProcedure(BL_SHUTDOWN_PRI_RSN_RESTART) != SUCCESS) {
       blinkSOS(1);
       msleep(10);
+    }
+  }
   /* morse 'OK' via the LED to signal that shutdown was successful */
   blinkOK(1);
   /* enter standby mode */
   PWR_EnterSTANDBYMode();
   /*
    * Even though this module will not restart the system by its own, the PowerManagement will reset the system.
    */
   return;
-            fc7151bb
+} /*** end of shutdownAndRestart ***/
-            69661903
+            Thomas Schöpping
 /*
  * Configures some GPIO pins as inputs for safety reasons.
  * Under certain circumstances, these pins might power hardware that is supposed to be shut down.
  */
 void configGpioForShutdown() {
   /* setup the configuration */
   GPIO_InitTypeDef gpio_init;
   gpio_init.GPIO_Mode   = GPIO_Mode_IN_FLOATING;
   gpio_init.GPIO_Speed  = GPIO_Speed_50MHz;
   /* configure SYS_UART_TX */
   gpio_init.GPIO_Pin = SYS_UART_TX_PIN;
   GPIO_Init(SYS_UART_TX_GPIO, &gpio_init);
   /* configure CAN_TX */
   gpio_init.GPIO_Pin = CAN_TX_PIN;
   GPIO_Init(CAN_TX_GPIO, &gpio_init);
   /* configure all MOTION (SPI) signals */
   gpio_init.GPIO_Pin = MOTION_SCLK_PIN;
   GPIO_Init(MOTION_SCLK_GPIO, &gpio_init);
   gpio_init.GPIO_Pin = MOTION_MISO_PIN;
   GPIO_Init(MOTION_MISO_GPIO, &gpio_init);
   gpio_init.GPIO_Pin = MOTION_MOSI_PIN;
   GPIO_Init(MOTION_MOSI_GPIO, &gpio_init);
   gpio_init.GPIO_Pin = ACCEL_SS_N_PIN;
   GPIO_Init(ACCEL_SS_N_GPIO, &gpio_init);
   gpio_init.GPIO_Pin = GYRO_SS_N_PIN;
   GPIO_Init(GYRO_SS_N_GPIO, &gpio_init);
   return;
 } /*** end of configGpioForShutdown ***/
 /*
  * System was reset via the NRST pin or the reason could not be detected.
  * In this case, there are three possibilities how to act:
  * 1) When the SYS_WARMRST_N signal becomes inactive, flashing mode is entered and the system will try to load the OS.
  * 2) When the SYS_UART_UP signal becomes active (low), the system will enter hibernate mode to enable charging via the pins.
  * 3) If none of both happens and a timeout occurs, the system enters deepsleep mode.
  */
 ErrorStatus handleColdReset() {
   /* wait until either the SYS_WARMRST_N signal goes up, or SYS_UART_UP goes down */
   enum CRST_SIG {CRST_SIG_SYS_WARMRST_N,
                  CRST_SIG_SYS_UART_UP,
                  CRST_SIG_TIMEOUT
                 } sig;
   uint32_t loopStartTime = 0;
   saTimerUpdate(&loopStartTime);
   uint32_t currentTime = loopStartTime;
   setLed(BLT_TRUE);
   while (1) {
     /* read the input signals */
     if (GPIO_ReadInputDataBit(SYS_REG_EN_GPIO, SYS_REG_EN_PIN) == Bit_SET &&
         GPIO_ReadInputDataBit(SYS_WARMRST_N_GPIO, SYS_WARMRST_N_PIN) == Bit_SET) {
       sig = CRST_SIG_SYS_WARMRST_N;
       break;
+    }
     if (GPIO_ReadInputDataBit(SYS_UART_UP_GPIO, SYS_UART_UP_PIN) == Bit_RESET) {
       sig = CRST_SIG_SYS_UART_UP;
       break;
+    }
     /* check for a timeout */
     saTimerUpdate(&currentTime);
     if (currentTime > loopStartTime + RESET_TIMEOUT_MS) {
       sig = CRST_SIG_TIMEOUT;
       break;
+    }
+  }
   setLed(BLT_FALSE);
   /* depending on the signal, react accordingly */
   switch (sig) {
     /* activation of the slave modules signales to boot the OS */
     case CRST_SIG_SYS_WARMRST_N:
+    {
       /* enable CAN clock */
       RCC_APB1PeriphClockCmd(RCC_APB1Periph_CAN1, ENABLE);
       /* initialize the bootloader */
       BootInit();
       /* start the infinite program loop */
       uint32_t loopStartTime = 0;
       saTimerUpdate(&loopStartTime);
       uint32_t currentTime = loopStartTime;
       while (1)
+      {
-            d54d2f07
+//        /* make the LED "double-blink" */
 //        saTimerUpdate(&currentTime);
 //        if (currentTime < loopStartTime + 50) {
 //          setLed(BLT_TRUE);
 //        } else if (currentTime < loopStartTime + 50+100) {
 //          setLed(BLT_FALSE);
 //        } else if (currentTime < loopStartTime + 50+100+50) {
 //          setLed(BLT_TRUE);
 //        } else if ( currentTime < loopStartTime + 50+100+50+300) {
 //          setLed(BLT_FALSE);
 //        } else {
 //          loopStartTime = currentTime;
 //        }
-            69661903
+            Thomas Schöpping
         /* run the bootloader task */
         BootTask();
         /* check the SYS_PD_N signal */
         if (GPIO_ReadInputDataBit(SYS_PD_N_GPIO, SYS_PD_N_PIN) == Bit_RESET) {
           blCallbackHandleShutdownRequest();
           return SUCCESS;
+        }
+      }
       break;
+    }
     /* activation of the UART_UP signal indicates that this module shall enter hibernate mode */
     case CRST_SIG_SYS_UART_UP:
+    {
       /* indicate that the MCU is busy */
       GPIO_ResetBits(SYS_UART_UP_GPIO, SYS_UART_UP_PIN);
       /* enable the charging pins */
       GPIO_SetBits(PATH_DCEN_GPIO, PATH_DCEN_PIN);
       /* wait some time so the systen voltage (VSYS) is stable if it is supplied via the pins */
       msleep(10);
       /* indicate that the MCU is not busy anymore */
       GPIO_SetBits(SYS_UART_UP_GPIO, SYS_UART_UP_PIN);
       /* configure the accelerometer external interrupt as event */
       EXTI_InitTypeDef exti;
       exti.EXTI_Line = EXTI_Line15;
       exti.EXTI_Mode = EXTI_Mode_Event;
       exti.EXTI_Trigger = EXTI_Trigger_Falling;
       exti.EXTI_LineCmd = ENABLE;
       EXTI_Init(&exti);
       /* sleep until something happens */
       __WFE();
       /* clear all pending EXTI events */
       EXTI_DeInit();
       EXTI_ClearFlag(EXTI_Line15);
       /* handle accelerometer wakeup
        * note: In fact, the only events that will occur at this point are an interrupt event from the accelerometer, or a
        * system reset from the PowerManagement via the NRST pin. Thus, if the following code is reached, it must have
        * been the accelerometer.
        */
       /* as as after a normal wakeup from the accelerometer */
       return handleAccelWakeup();
       break;
+    }
     /* if a timeout occurred, the system enters deepsleep mode */
     case CRST_SIG_TIMEOUT:
+    {
       /* reconfigure the LED_GPIO as input so it will not light up (and thus save energy) */
       GPIO_InitTypeDef gpio_init;
       gpio_init.GPIO_Pin    = LED_PIN;
       gpio_init.GPIO_Mode   = GPIO_Mode_IN_FLOATING;
       gpio_init.GPIO_Speed  = GPIO_Speed_50MHz;
       GPIO_Init(LED_GPIO, &gpio_init);
       /* reconfigure SYS_PD_N as input so the callback will not indicate a shutdown */
       gpio_init.GPIO_Pin    = SYS_PD_N_PIN;
       gpio_init.GPIO_Mode   = GPIO_Mode_IN_FLOATING;
       gpio_init.GPIO_Speed  = GPIO_Speed_50MHz;
       GPIO_Init(SYS_PD_N_GPIO, &gpio_init);
       blCallbackShutdownDeepsleep();
       break;
+    }
     default:
       break;
+  }
   return ERROR;
 } /*** end of handleColdReset ***/
 /*
  * System was woken up via the WKUP pin and the SYS_UART_UP signal was found to be responsible.
  * In this case, the system starts as after a cold reset.
  */
 ErrorStatus handleUartWakeup() {
   return handleColdReset();
 } /*** end of handleUartWakeup ***/
 /*
  * System was woken up via the WKUP pin and the ACCEL_INT_N signal was found to be responsible.
  * The SYS_UART_UP signal is used to wake the PowerManagement before a normal cold reset is performed.
  */
 ErrorStatus handleAccelWakeup() {
   /* wakeup the PowerManegement (ensure that the pulse is detected) */
   GPIO_ResetBits(SYS_UART_UP_GPIO, SYS_UART_UP_PIN);
   msleep(1);
   GPIO_SetBits(SYS_UART_UP_GPIO, SYS_UART_UP_PIN);
   return handleColdReset();
 } /*** end of handleAccelWakeu ***/
 /*
  * Callback function that handles the system shutdown and enters transportation mode.
  * When called from a multithreaded environment, it must be ensured that no other thread will preempt this function.
  * In transportation low-power mode the system can only be woken up by pulling down the NRST signal.
  * Furthermore, the system can not be charged when in transportation mode.
  */
-            fc7151bb
+void blCallbackShutdownTransportation() {
-            69661903
+  /* make sure that the required clocks are activated */
   RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD, ENABLE);
   /* set/keep the SYS_SYNC and SYS_PD signals active */
   GPIO_ResetBits(SYS_SYNC_N_GPIO, SYS_SYNC_N_PIN);
   GPIO_ResetBits(SYS_PD_N_GPIO, SYS_PD_N_PIN);
-            fc7151bb
+  /* initialized the standalone timer */
-            69661903
+  saTimerInit();
-            fc7151bb
+  setLed(BLT_TRUE);
-            69661903
+  shutdownToTransportation(BLT_TRUE);
   return;
 } /*** end of blCallbackShutdownTransportation ***/
 /*
  * Callback function that handles the system shutdown and enters deepsleep mode.
  * When called from a multithreaded environment, it must be ensured that no other thread will preempt this function.
  * In deepsleep low-power mode the system can only be woken up via the NRST or the WKUP signal, or the RTC or IWDG, if configured.
  */
 void blCallbackShutdownDeepsleep(void) {
   /* make sure that the required clocks are activated */
   RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD, ENABLE);
   /* set/keep the SYS_SYNC and SYS_PD signals active */
   GPIO_ResetBits(SYS_SYNC_N_GPIO, SYS_SYNC_N_PIN);
   GPIO_ResetBits(SYS_PD_N_GPIO, SYS_PD_N_PIN);
-            fc7151bb
+  /* initialized the standalone timer */
-            69661903
+  saTimerInit();
-            fc7151bb
+  setLed(BLT_TRUE);
-            69661903
+  shutdownToDeepsleep(BLT_TRUE);
   return;
 } /*** end of blCallbackShutdownDeepsleep ***/
 /*
  * Callback function that handles the system shutdown and enters hibernate mode.
  * When called from a multithreaded environment, it must be ensured that no other thread will preempt this function.
  */
 void blCallbackShutdownHibernate(void) {
   /* make sure that the required clocks are activated */
   RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD, ENABLE);
   /* set/keep the SYS_SYNC and SYS_PD signals active */
   GPIO_ResetBits(SYS_SYNC_N_GPIO, SYS_SYNC_N_PIN);
   GPIO_ResetBits(SYS_PD_N_GPIO, SYS_PD_N_PIN);
-            fc7151bb
+  /* initialized the standalone timer */
-            69661903
+  saTimerInit();
-            fc7151bb
+  setLed(BLT_TRUE);
-            69661903
+  shutdownToHibernate(BLT_TRUE);
   return;
 } /*** end of blCallbackShutdownHibernate ***/
 /*
  * Callback function that handles the system shutdown and initializes a restart.
  * When called from a multithreaded environment, it must be ensured that no other thread will preempt this function.
  */
 void blCallbackShutdownRestart(void) {
   /* make sure that the required clocks are activated */
   RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD, ENABLE);
-            fc7151bb
+  /* set/keep the SYS_SYNC and SYS_PD signals active */
-            69661903
+  GPIO_ResetBits(SYS_SYNC_N_GPIO, SYS_SYNC_N_PIN);
   GPIO_ResetBits(SYS_PD_N_GPIO, SYS_PD_N_PIN);
-            fc7151bb
+  /* initialized the standalone timer */
-            69661903
+  saTimerInit();
-            fc7151bb
+            Thomas Schöpping
   setLed(BLT_TRUE);
   /* deactivate SYS_PD_N and ensure that all modules had a chance to detect the falling edge */
-            69661903
+  msleep(1);
   GPIO_SetBits(SYS_PD_N_GPIO, SYS_PD_N_PIN);
   msleep(1);
   shutdownAndRestart(BLT_TRUE);
   return;
 } /*** end of blCallbackRestart ***/
 /*
  * Callback function that handles a system shutdown/restart request from another module.
  * Depending on the result of the disambiguation procedure, the module will enter the according low-power mode or restart.
  * When called from a multithreaded environment, it must be ensured that no other thread will preempt this function.
  */
 void blCallbackHandleShutdownRequest(void) {
   /* make sure that the required clocks are activated */
   RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);
   RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD, ENABLE);
-            fc7151bb
+  /* set/keep the SYS_SYNC and SYS_PD signals active */
-            69661903
+  GPIO_ResetBits(SYS_SYNC_N_GPIO, SYS_SYNC_N_PIN);
   GPIO_ResetBits(SYS_PD_N_GPIO, SYS_PD_N_PIN);
   /* initialized the standalone timer */
   saTimerInit();
   setLed(BLT_TRUE);
   /* deactivate SYS_PD_N and ensure that all modules had a chance to detect the falling edge */
   msleep(1);
   GPIO_SetBits(SYS_PD_N_GPIO, SYS_PD_N_PIN);
   msleep(1);
   /* wait for all boards to be ready for shutdown */
   GPIO_SetBits(SYS_SYNC_N_GPIO, SYS_SYNC_N_PIN);
   if (GPIO_ReadOutputDataBit(SYS_REG_EN_GPIO, SYS_REG_EN_PIN) == Bit_SET) {
-            fc7151bb
+    // this must be skipped if the pullup voltage (VIO3.3) is not active
-            69661903
+    setLed(BLT_TRUE);
     waitForSignal(SYS_SYNC_N_GPIO, SYS_SYNC_N_PIN, Bit_SET);
     setLed(BLT_FALSE);
+  }
   /* check ths SYS_PD_N signal, whether the system shall shutdown or restart */
   blt_bool shutdown_nrestart = (GPIO_ReadInputDataBit(SYS_PD_N_GPIO, SYS_PD_N_PIN) == Bit_RESET) ? BLT_TRUE : BLT_FALSE;
   /* disambiguation procedure (passive) */
   uint32_t pulse_counter = 0;
   while (waitForSignalTimeout(SYS_SYNC_N_GPIO, SYS_SYNC_N_PIN, Bit_RESET, 10)) {
     waitForSignal(SYS_SYNC_N_GPIO, SYS_SYNC_N_PIN, Bit_SET);
     ++pulse_counter;
+  }
   /* evaluate and hanlde disambiguation result */
   if (shutdown_nrestart == BLT_TRUE) {
     /* shutdown request */
     /* handle special cases */
     if (pulse_counter == BL_SHUTDOWN_PRI_RSN_UNKNOWN) {
       /* no pulse at all was received */
       pulse_counter = BL_SHUTDOWN_PRI_RSN_DEFAULT;
     } else if (pulse_counter != BL_SHUTDOWN_PRI_RSN_HIBERNATE &&
                pulse_counter != BL_SHUTDOWN_PRI_RSN_DEEPSLEEP &&
                pulse_counter != BL_SHUTDOWN_PRI_RSN_TRANSPORT) {
       /* invalid number of pulses received */
       blinkSOS(1);
       pulse_counter = BL_SHUTDOWN_PRI_RSN_DEFAULT;
+    }
     switch (pulse_counter) {
       case BL_SHUTDOWN_PRI_RSN_HIBERNATE:
         shutdownToHibernate(BLT_FALSE);
         break;
       case BL_SHUTDOWN_PRI_RSN_DEEPSLEEP:
         shutdownToDeepsleep(BLT_FALSE);
         break;
       case BL_SHUTDOWN_PRI_RSN_TRANSPORT:
         shutdownToTransportation(BLT_FALSE);
         break;
+    }
   } else {
     /* restart request */
     /* there is no ambiguity for restart, so it is ignored */
     shutdownAndRestart(BLT_FALSE);
+  }
   /* if this code is reached, the system did neither shut down, nor restart.
    * This must never be the case!
    */
   blinkSOSinf();
   return;
 } /*** end of blCallbackHandleShutdownRequest ***/
 /*********************************** end of main.c *************************************/