cr_startup_lpc11u.c

//*****************************************************************************
// LPC11U Microcontroller Startup code for use with LPCXpresso IDE
//
// Version : 130603
//*****************************************************************************
//
// Copyright(C) NXP Semiconductors, 2013
// All rights reserved.
//
// Software that is described herein is for illustrative purposes only
// which provides customers with programming information regarding the
// LPC products.  This software is supplied "AS IS" without any warranties of
// any kind, and NXP Semiconductors and its licensor disclaim any and
// all warranties, express or implied, including all implied warranties of
// merchantability, fitness for a particular purpose and non-infringement of
// intellectual property rights.  NXP Semiconductors assumes no responsibility
// or liability for the use of the software, conveys no license or rights under any
// patent, copyright, mask work right, or any other intellectual property rights in
// or to any products. NXP Semiconductors reserves the right to make changes
// in the software without notification. NXP Semiconductors also makes no
// representation or warranty that such application will be suitable for the
// specified use without further testing or modification.
//
// Permission to use, copy, modify, and distribute this software and its
// documentation is hereby granted, under NXP Semiconductors' and its
// licensor's relevant copyrights in the software, without fee, provided that it
// is used in conjunction with NXP Semiconductors microcontrollers.  This
// copyright, permission, and disclaimer notice must appear in all copies of
// this code.
//*****************************************************************************

#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 ALIAS(f) __attribute__ ((weak, alias (#f)))

#if defined (__USE_CMSIS)
void SystemInit(void);
#endif

// Patch the AEABI integer divide functions to use MCU's romdivide library
#ifdef __USE_ROMDIVIDE
// Location in memory that holds the address of the ROM Driver table
#define PTR_ROM_DRIVER_TABLE ((unsigned int *)(0x1FFF1FF8))
// Variables to store addresses of idiv and udiv functions within MCU ROM
unsigned int *pDivRom_idiv;
unsigned int *pDivRom_uidiv;
#endif

//*****************************************************************************
#if defined (__cplusplus)
extern "C" {
#endif

//*****************************************************************************
//
// Forward declaration of the default handlers. These are aliased.
// When the application defines a handler (with the same name), this will 
// automatically take precedence over these weak definitions
//
//*****************************************************************************
     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 specific IRQ handlers. These are aliased
// to the IntDefaultHandler, which is a 'forever' loop. When the application
// defines a handler (with the same name), this will automatically take
// precedence over these weak definitions
//
//*****************************************************************************
void FLEX_INT0_IRQHandler (void) ALIAS(IntDefaultHandler);
void FLEX_INT1_IRQHandler (void) ALIAS(IntDefaultHandler);
void FLEX_INT2_IRQHandler (void) ALIAS(IntDefaultHandler);
void FLEX_INT3_IRQHandler (void) ALIAS(IntDefaultHandler);
void FLEX_INT4_IRQHandler (void) ALIAS(IntDefaultHandler);
void FLEX_INT5_IRQHandler (void) ALIAS(IntDefaultHandler);
void FLEX_INT6_IRQHandler (void) ALIAS(IntDefaultHandler);
void FLEX_INT7_IRQHandler (void) ALIAS(IntDefaultHandler);
void GINT0_IRQHandler (void) ALIAS(IntDefaultHandler);
void GINT1_IRQHandler (void) ALIAS(IntDefaultHandler);
void SSP1_IRQHandler (void) ALIAS(IntDefaultHandler);
void I2C_IRQHandler (void) ALIAS(IntDefaultHandler);
void TIMER16_0_IRQHandler (void) ALIAS(IntDefaultHandler);
void TIMER16_1_IRQHandler (void) ALIAS(IntDefaultHandler);
void TIMER32_0_IRQHandler (void) ALIAS(IntDefaultHandler);
void TIMER32_1_IRQHandler (void) ALIAS(IntDefaultHandler);
void SSP0_IRQHandler (void) ALIAS(IntDefaultHandler);
void UART_IRQHandler (void) ALIAS(IntDefaultHandler);
void USB_IRQHandler (void) ALIAS(IntDefaultHandler);
void USB_FIQHandler (void) ALIAS(IntDefaultHandler);
void ADC_IRQHandler (void) ALIAS(IntDefaultHandler);
void WDT_IRQHandler (void) ALIAS(IntDefaultHandler);
void BOD_IRQHandler (void) ALIAS(IntDefaultHandler);
void FMC_IRQHandler (void) ALIAS(IntDefaultHandler);
void USBWakeup_IRQHandler (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);

//*****************************************************************************
#if defined (__cplusplus)
} // extern "C"
#endif
//*****************************************************************************
//
// The vector table.  Note that the proper constructs must be placed on this to
// ensure that it ends up at physical address 0x0000.0000.
//
//*****************************************************************************
extern void (* const g_pfnVectors[])(void);
__attribute__ ((section(".isr_vector")))
void (* const g_pfnVectors[])(void) = {
    &_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
    0,                                // Reserved
    0,                                // Reserved
    0,                                // Reserved
    0,                                // Reserved
    SVC_Handler,                   // SVCall handler
    0,                                // Reserved
    0,                                // Reserved
    PendSV_Handler,                   // The PendSV handler
    SysTick_Handler,                  // The SysTick handler

    // LPC11U specific handlers
    FLEX_INT0_IRQHandler,             //  0 - GPIO pin interrupt 0
    FLEX_INT1_IRQHandler,             //  1 - GPIO pin interrupt 1
    FLEX_INT2_IRQHandler,             //  2 - GPIO pin interrupt 2
    FLEX_INT3_IRQHandler,             //  3 - GPIO pin interrupt 3
    FLEX_INT4_IRQHandler,             //  4 - GPIO pin interrupt 4
    FLEX_INT5_IRQHandler,             //  5 - GPIO pin interrupt 5
    FLEX_INT6_IRQHandler,             //  6 - GPIO pin interrupt 6
    FLEX_INT7_IRQHandler,             //  7 - GPIO pin interrupt 7
    GINT0_IRQHandler,                 //  8 - GPIO GROUP0 interrupt
    GINT1_IRQHandler,                 //  9 - GPIO GROUP1 interrupt
    0,                                // 10 - Reserved
    0,                                // 11 - Reserved
    0,                                // 12 - Reserved
    0,                                // 13 - Reserved
    SSP1_IRQHandler,                  // 14 - SPI/SSP1 Interrupt
    I2C_IRQHandler,                   // 15 - I2C0
    TIMER16_0_IRQHandler,             // 16 - CT16B0 (16-bit Timer 0)
    TIMER16_1_IRQHandler,             // 17 - CT16B1 (16-bit Timer 1)
    TIMER32_0_IRQHandler,             // 18 - CT32B0 (32-bit Timer 0)
    TIMER32_1_IRQHandler,             // 19 - CT32B1 (32-bit Timer 1)
    SSP0_IRQHandler,                  // 20 - SPI/SSP0 Interrupt
    UART_IRQHandler,                  // 21 - UART0
    USB_IRQHandler,                   // 22 - USB IRQ
    USB_FIQHandler,                   // 23 - USB FIQ
    ADC_IRQHandler,                   // 24 - ADC (A/D Converter)
    WDT_IRQHandler,                   // 25 - WDT (Watchdog Timer)
    BOD_IRQHandler,                   // 26 - BOD (Brownout Detect)
    FMC_IRQHandler,                   // 27 - IP2111 Flash Memory Controller
    0,                                // 28 - Reserved
    0,                                // 29 - Reserved
    USBWakeup_IRQHandler,             // 30 - USB wake-up interrupt
    0,                                // 31 - Reserved
};

//*****************************************************************************
// 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")))
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")))
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")))
void
ResetISR(void) {
    //
    // 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);
	}

	// Patch the AEABI integer divide functions to use MCU's romdivide library
#ifdef __USE_ROMDIVIDE
	// Get address of Integer division routines function table in ROM
	unsigned int *div_ptr = (unsigned int *)((unsigned int *)*(PTR_ROM_DRIVER_TABLE))[4];
	// Get addresses of integer divide routines in ROM
	// These address are then used by the code in aeabi_romdiv_patch.s
	pDivRom_idiv = (unsigned int *)div_ptr[0];
	pDivRom_uidiv = (unsigned int *)div_ptr[1];
#endif

#ifdef __USE_CMSIS
	SystemInit();
#endif

#if defined (__cplusplus)
	//
	// Call C++ library initialisation
	//
	__libc_init_array();
#endif

#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 exception handlers. Override the ones here by defining your own
// handler routines in your application code.
//*****************************************************************************
__attribute__ ((section(".after_vectors")))
void NMI_Handler(void)
{
    while(1)
    {
    }
}
__attribute__ ((section(".after_vectors")))
void HardFault_Handler(void)
{
    while(1)
    {
    }
}
__attribute__ ((section(".after_vectors")))
void SVC_Handler(void)
{
    while(1)
    {
    }
}
__attribute__ ((section(".after_vectors")))
void PendSV_Handler(void)
{
    while(1)
    {
    }
}
__attribute__ ((section(".after_vectors")))
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.
//
//*****************************************************************************
__attribute__ ((section(".after_vectors")))
void IntDefaultHandler(void)
{
    while(1)
    {
    }
}