text: //*****************************************************************************
  // LPC822 startup code for use with MCUXpresso IDE
  //
  // Version : 160420
  //*****************************************************************************
  //
  // Copyright 2016-2020 NXP
  // All rights reserved.
  //
  // SPDX-License-Identifier: BSD-3-Clause
  //*****************************************************************************
  
  #if defined (DEBUG)
  #pragma GCC push_options
  #pragma GCC optimize ("Og")
  #endif // (DEBUG)
  
  #if defined (__cplusplus)
  #ifdef __REDLIB__
  #error Redlib does not support C++
  #else
  //*****************************************************************************
  //
  // The entry point for the C++ library startup
  //
  //*****************************************************************************
  extern "C" {
      extern void __libc_init_array(void);
  }
  #endif
  #endif
  
  #define WEAK __attribute__ ((weak))
  #define WEAK_AV __attribute__ ((weak, section(".after_vectors")))
  #define ALIAS(f) __attribute__ ((weak, alias (#f)))
  
  //*****************************************************************************
  #if defined (__cplusplus)
  extern "C" {
  #endif
  
  //*****************************************************************************
  // Variable to store CRP value in. Will be placed automatically
  // by the linker when "Enable Code Read Protect" selected.
  // See crp.h header for more information
  //*****************************************************************************
  #include <NXP/crp.h>
  __CRP const unsigned int CRP_WORD = CRP_NO_CRP ;
  
  //*****************************************************************************
  // Declaration of external SystemInit function
  //*****************************************************************************
  #if defined (__USE_CMSIS)
  extern void SystemInit(void);
  #endif // (__USE_CMSIS)
  
  //*****************************************************************************
  // Forward declaration of the core exception handlers.
  // When the application defines a handler (with the same name), this will
  // automatically take precedence over these weak definitions.
  // If your application is a C++ one, then any interrupt handlers defined
  // in C++ files within in your main application will need to have C linkage
  // rather than C++ linkage. To do this, make sure that you are using extern "C"
  // { .... } around the interrupt handler within your main application code.
  //*****************************************************************************
       void ResetISR(void);
  WEAK void NMI_Handler(void);
  WEAK void HardFault_Handler(void);
  WEAK void SVC_Handler(void);
  WEAK void PendSV_Handler(void);
  WEAK void SysTick_Handler(void);
  WEAK void IntDefaultHandler(void);
  
  //*****************************************************************************
  // Forward declaration of the application IRQ handlers. When the application
  // defines a handler (with the same name), this will automatically take
  // precedence over weak definitions below
  //*****************************************************************************
  WEAK void SPI0_IRQHandler(void);
  WEAK void SPI1_IRQHandler(void);
  WEAK void Reserved18_IRQHandler(void);
  WEAK void USART0_IRQHandler(void);
  WEAK void USART1_IRQHandler(void);
  WEAK void USART2_IRQHandler(void);
  WEAK void Reserved22_IRQHandler(void);
  WEAK void I2C1_IRQHandler(void);
  WEAK void I2C0_IRQHandler(void);
  WEAK void SCT0_IRQHandler(void);
  WEAK void MRT0_IRQHandler(void);
  WEAK void CMP_IRQHandler(void);
  WEAK void WDT_IRQHandler(void);
  WEAK void BOD_IRQHandler(void);
  WEAK void FLASH_IRQHandler(void);
  WEAK void WKT_IRQHandler(void);
  WEAK void ADC0_SEQA_IRQHandler(void);
  WEAK void ADC0_SEQB_IRQHandler(void);
  WEAK void ADC0_THCMP_IRQHandler(void);
  WEAK void ADC0_OVR_IRQHandler(void);
  WEAK void DMA0_IRQHandler(void);
  WEAK void I2C2_IRQHandler(void);
  WEAK void I2C3_IRQHandler(void);
  WEAK void Reserved39_IRQHandler(void);
  WEAK void PIN_INT0_IRQHandler(void);
  WEAK void PIN_INT1_IRQHandler(void);
  WEAK void PIN_INT2_IRQHandler(void);
  WEAK void PIN_INT3_IRQHandler(void);
  WEAK void PIN_INT4_IRQHandler(void);
  WEAK void PIN_INT5_IRQHandler(void);
  WEAK void PIN_INT6_IRQHandler(void);
  WEAK void PIN_INT7_IRQHandler(void);
  
  //*****************************************************************************
  // Forward declaration of the driver IRQ handlers. These are aliased
  // to the IntDefaultHandler, which is a 'forever' loop. When the driver
  // defines a handler (with the same name), this will automatically take
  // precedence over these weak definitions
  //*****************************************************************************
  void SPI0_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  void SPI1_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  void Reserved18_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  void USART0_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  void USART1_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  void USART2_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  void Reserved22_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  void I2C1_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  void I2C0_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  void SCT0_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  void MRT0_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  void CMP_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  void WDT_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  void BOD_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  void FLASH_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  void WKT_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  void ADC0_SEQA_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  void ADC0_SEQB_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  void ADC0_THCMP_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  void ADC0_OVR_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  void DMA0_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  void I2C2_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  void I2C3_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  void Reserved39_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  void PIN_INT0_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  void PIN_INT1_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  void PIN_INT2_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  void PIN_INT3_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  void PIN_INT4_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  void PIN_INT5_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  void PIN_INT6_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  void PIN_INT7_DriverIRQHandler(void) ALIAS(IntDefaultHandler);
  
  //*****************************************************************************
  // The entry point for the application.
  // __main() is the entry point for Redlib based applications
  // main() is the entry point for Newlib based applications
  //*****************************************************************************
  #if defined (__REDLIB__)
  extern void __main(void);
  #endif
  extern int main(void);
  
  //*****************************************************************************
  // External declaration for the pointer to the stack top from the Linker Script
  //*****************************************************************************
  extern void _vStackTop(void);
  //*****************************************************************************
  // External declaration for LPC MCU vector table checksum from  Linker Script
  //*****************************************************************************
  WEAK extern void __valid_user_code_checksum();
  
  //*****************************************************************************
  //*****************************************************************************
  #if defined (__cplusplus)
  } // extern "C"
  #endif
  //*****************************************************************************
  // The vector table.
  // This relies on the linker script to place at correct location in memory.
  //*****************************************************************************
  
  
  
  extern void (* const g_pfnVectors[])(void);
  extern void * __Vectors __attribute__ ((alias ("g_pfnVectors")));
  
  __attribute__ ((used, section(".isr_vector")))
  void (* const g_pfnVectors[])(void) = {
      // Core Level - CM0P
      &_vStackTop,                       // The initial stack pointer
      ResetISR,                          // The reset handler
      NMI_Handler,                       // The NMI handler
      HardFault_Handler,                 // The hard fault handler
      0,                                 // Reserved
      0,                                 // Reserved
      0,                                 // Reserved
      __valid_user_code_checksum,        // LPC MCU checksum
      0,                                 // ECRP
      0,                                 // Reserved
      0,                                 // Reserved
      SVC_Handler,                       // SVCall handler
      0,                                 // Reserved
      0,                                 // Reserved
      PendSV_Handler,                    // The PendSV handler
      SysTick_Handler,                   // The SysTick handler
  
      // Chip Level - LPC822
      SPI0_IRQHandler,         // 16: SPI0 interrupt
      SPI1_IRQHandler,         // 17: SPI1 interrupt
      Reserved18_IRQHandler,   // 18: Reserved interrupt
      USART0_IRQHandler,       // 19: USART0 interrupt
      USART1_IRQHandler,       // 20: USART1 interrupt
      USART2_IRQHandler,       // 21: USART2 interrupt
      Reserved22_IRQHandler,   // 22: Reserved interrupt
      I2C1_IRQHandler,         // 23: I2C1 interrupt
      I2C0_IRQHandler,         // 24: I2C0 interrupt
      SCT0_IRQHandler,         // 25: State configurable timer interrupt
      MRT0_IRQHandler,         // 26: Multi-rate timer interrupt
      CMP_IRQHandler,          // 27: Analog comparator interrupt
      WDT_IRQHandler,          // 28: Windowed watchdog timer interrupt
      BOD_IRQHandler,          // 29: BOD interrupts
      FLASH_IRQHandler,        // 30: flash interrupt
      WKT_IRQHandler,          // 31: Self-wake-up timer interrupt
      ADC0_SEQA_IRQHandler,    // 32: ADC0 sequence A completion.
      ADC0_SEQB_IRQHandler,    // 33: ADC0 sequence B completion.
      ADC0_THCMP_IRQHandler,   // 34: ADC0 threshold compare and error.
      ADC0_OVR_IRQHandler,     // 35: ADC0 overrun
      DMA0_IRQHandler,         // 36: DMA0 interrupt
      I2C2_IRQHandler,         // 37: I2C2 interrupt
      I2C3_IRQHandler,         // 38: I2C3 interrupt
      Reserved39_IRQHandler,   // 39: Reserved interrupt
      PIN_INT0_IRQHandler,     // 40: Pin interrupt 0 or pattern match engine slice 0 interrupt
      PIN_INT1_IRQHandler,     // 41: Pin interrupt 1 or pattern match engine slice 1 interrupt
      PIN_INT2_IRQHandler,     // 42: Pin interrupt 2 or pattern match engine slice 2 interrupt
      PIN_INT3_IRQHandler,     // 43: Pin interrupt 3 or pattern match engine slice 3 interrupt
      PIN_INT4_IRQHandler,     // 44: Pin interrupt 4 or pattern match engine slice 4 interrupt
      PIN_INT5_IRQHandler,     // 45: Pin interrupt 5 or pattern match engine slice 5 interrupt
      PIN_INT6_IRQHandler,     // 46: Pin interrupt 6 or pattern match engine slice 6 interrupt
      PIN_INT7_IRQHandler,     // 47: Pin interrupt 7 or pattern match engine slice 7 interrupt
  
  
  }; /* End of g_pfnVectors */
  
  //*****************************************************************************
  // Functions to carry out the initialization of RW and BSS data sections. These
  // are written as separate functions rather than being inlined within the
  // ResetISR() function in order to cope with MCUs with multiple banks of
  // memory.
  //*****************************************************************************
  __attribute__ ((section(".after_vectors.init_data")))
  void data_init(unsigned int romstart, unsigned int start, unsigned int len) {
      unsigned int *pulDest = (unsigned int*) start;
      unsigned int *pulSrc = (unsigned int*) romstart;
      unsigned int loop;
      for (loop = 0; loop < len; loop = loop + 4)
          *pulDest++ = *pulSrc++;
  }
  
  __attribute__ ((section(".after_vectors.init_bss")))
  void bss_init(unsigned int start, unsigned int len) {
      unsigned int *pulDest = (unsigned int*) start;
      unsigned int loop;
      for (loop = 0; loop < len; loop = loop + 4)
          *pulDest++ = 0;
  }
  
  //*****************************************************************************
  // The following symbols are constructs generated by the linker, indicating
  // the location of various points in the "Global Section Table". This table is
  // created by the linker via the Code Red managed linker script mechanism. It
  // contains the load address, execution address and length of each RW data
  // section and the execution and length of each BSS (zero initialized) section.
  //*****************************************************************************
  extern unsigned int __data_section_table;
  extern unsigned int __data_section_table_end;
  extern unsigned int __bss_section_table;
  extern unsigned int __bss_section_table_end;
  
  //*****************************************************************************
  // Reset entry point for your code.
  // Sets up a simple runtime environment and initializes the C/C++
  // library.
  //*****************************************************************************
  __attribute__ ((section(".after_vectors.reset")))
  void ResetISR(void) {
  
      // Disable interrupts
      __asm volatile ("cpsid i");
  
  
      // Enable SRAM clock used by Stack
      __asm volatile ("LDR R0, =0x40000220\n\t"
                      "MOV R1, #56\n\t"
                      "STR R1, [R0]");
  
  #if defined (__USE_CMSIS)
  // If __USE_CMSIS defined, then call CMSIS SystemInit code
      SystemInit();
  
  #endif // (__USE_CMSIS)
  
      //
      // Copy the data sections from flash to SRAM.
      //
      unsigned int LoadAddr, ExeAddr, SectionLen;
      unsigned int *SectionTableAddr;
  
      // Load base address of Global Section Table
      SectionTableAddr = &__data_section_table;
  
      // Copy the data sections from flash to SRAM.
      while (SectionTableAddr < &__data_section_table_end) {
          LoadAddr = *SectionTableAddr++;
          ExeAddr = *SectionTableAddr++;
          SectionLen = *SectionTableAddr++;
          data_init(LoadAddr, ExeAddr, SectionLen);
      }
  
      // At this point, SectionTableAddr = &__bss_section_table;
      // Zero fill the bss segment
      while (SectionTableAddr < &__bss_section_table_end) {
          ExeAddr = *SectionTableAddr++;
          SectionLen = *SectionTableAddr++;
          bss_init(ExeAddr, SectionLen);
      }
  
  
  #if !defined (__USE_CMSIS)
  // Assume that if __USE_CMSIS defined, then CMSIS SystemInit code
  // will setup the VTOR register
  
      // Check to see if we are running the code from a non-zero
      // address (eg RAM, external flash), in which case we need
      // to modify the VTOR register to tell the CPU that the
      // vector table is located at a non-0x0 address.
      unsigned int * pSCB_VTOR = (unsigned int *) 0xE000ED08;
      if ((unsigned int *)g_pfnVectors!=(unsigned int *) 0x00000000) {
          *pSCB_VTOR = (unsigned int)g_pfnVectors;
      }
  #endif // (__USE_CMSIS)
  #if defined (__cplusplus)
      //
      // Call C++ library initialisation
      //
      __libc_init_array();
  #endif
  
      // Reenable interrupts
      __asm volatile ("cpsie i");
  
  #if defined (__REDLIB__)
      // Call the Redlib library, which in turn calls main()
      __main();
  #else
      main();
  #endif
  
      //
      // main() shouldn't return, but if it does, we'll just enter an infinite loop
      //
      while (1) {
          ;
      }
  }
  
  //*****************************************************************************
  // Default core exception handlers. Override the ones here by defining your own
  // handler routines in your application code.
  //*****************************************************************************
  WEAK_AV void NMI_Handler(void)
  { while(1) {}
  }
  
  WEAK_AV void HardFault_Handler(void)
  { while(1) {}
  }
  
  WEAK_AV void SVC_Handler(void)
  { while(1) {}
  }
  
  WEAK_AV void PendSV_Handler(void)
  { while(1) {}
  }
  
  WEAK_AV void SysTick_Handler(void)
  { while(1) {}
  }
  
  //*****************************************************************************
  // Processor ends up here if an unexpected interrupt occurs or a specific
  // handler is not present in the application code.
  //*****************************************************************************
  WEAK_AV void IntDefaultHandler(void)
  { while(1) {}
  }
  
  //*****************************************************************************
  // Default application exception handlers. Override the ones here by defining
  // your own handler routines in your application code. These routines call
  // driver exception handlers or IntDefaultHandler() if no driver exception
  // handler is included.
  //*****************************************************************************
  WEAK_AV void SPI0_IRQHandler(void)
  {   SPI0_DriverIRQHandler();
  }
  
  WEAK_AV void SPI1_IRQHandler(void)
  {   SPI1_DriverIRQHandler();
  }
  
  WEAK_AV void Reserved18_IRQHandler(void)
  {   Reserved18_DriverIRQHandler();
  }
  
  WEAK_AV void USART0_IRQHandler(void)
  {   USART0_DriverIRQHandler();
  }
  
  WEAK_AV void USART1_IRQHandler(void)
  {   USART1_DriverIRQHandler();
  }
  
  WEAK_AV void USART2_IRQHandler(void)
  {   USART2_DriverIRQHandler();
  }
  
  WEAK_AV void Reserved22_IRQHandler(void)
  {   Reserved22_DriverIRQHandler();
  }
  
  WEAK_AV void I2C1_IRQHandler(void)
  {   I2C1_DriverIRQHandler();
  }
  
  WEAK_AV void I2C0_IRQHandler(void)
  {   I2C0_DriverIRQHandler();
  }
  
  WEAK_AV void SCT0_IRQHandler(void)
  {   SCT0_DriverIRQHandler();
  }
  
  WEAK_AV void MRT0_IRQHandler(void)
  {   MRT0_DriverIRQHandler();
  }
  
  WEAK_AV void CMP_IRQHandler(void)
  {   CMP_DriverIRQHandler();
  }
  
  WEAK_AV void WDT_IRQHandler(void)
  {   WDT_DriverIRQHandler();
  }
  
  WEAK_AV void BOD_IRQHandler(void)
  {   BOD_DriverIRQHandler();
  }
  
  WEAK_AV void FLASH_IRQHandler(void)
  {   FLASH_DriverIRQHandler();
  }
  
  WEAK_AV void WKT_IRQHandler(void)
  {   WKT_DriverIRQHandler();
  }
  
  WEAK_AV void ADC0_SEQA_IRQHandler(void)
  {   ADC0_SEQA_DriverIRQHandler();
  }
  
  WEAK_AV void ADC0_SEQB_IRQHandler(void)
  {   ADC0_SEQB_DriverIRQHandler();
  }
  
  WEAK_AV void ADC0_THCMP_IRQHandler(void)
  {   ADC0_THCMP_DriverIRQHandler();
  }
  
  WEAK_AV void ADC0_OVR_IRQHandler(void)
  {   ADC0_OVR_DriverIRQHandler();
  }
  
  WEAK_AV void DMA0_IRQHandler(void)
  {   DMA0_DriverIRQHandler();
  }
  
  WEAK_AV void I2C2_IRQHandler(void)
  {   I2C2_DriverIRQHandler();
  }
  
  WEAK_AV void I2C3_IRQHandler(void)
  {   I2C3_DriverIRQHandler();
  }
  
  WEAK_AV void Reserved39_IRQHandler(void)
  {   Reserved39_DriverIRQHandler();
  }
  
  WEAK_AV void PIN_INT0_IRQHandler(void)
  {   PIN_INT0_DriverIRQHandler();
  }
  
  WEAK_AV void PIN_INT1_IRQHandler(void)
  {   PIN_INT1_DriverIRQHandler();
  }
  
  WEAK_AV void PIN_INT2_IRQHandler(void)
  {   PIN_INT2_DriverIRQHandler();
  }
  
  WEAK_AV void PIN_INT3_IRQHandler(void)
  {   PIN_INT3_DriverIRQHandler();
  }
  
  WEAK_AV void PIN_INT4_IRQHandler(void)
  {   PIN_INT4_DriverIRQHandler();
  }
  
  WEAK_AV void PIN_INT5_IRQHandler(void)
  {   PIN_INT5_DriverIRQHandler();
  }
  
  WEAK_AV void PIN_INT6_IRQHandler(void)
  {   PIN_INT6_DriverIRQHandler();
  }
  
  WEAK_AV void PIN_INT7_IRQHandler(void)
  {   PIN_INT7_DriverIRQHandler();
  }
  
  //*****************************************************************************
  
  #if defined (DEBUG)
  #pragma GCC pop_options
  #endif // (DEBUG)
  