cr_freertos_startup_lpc8xx.c

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//*****************************************************************************
//   +--+
//   | ++----+
//   +-++    |
//     |     |
//   +-+--+  |
//   | +--+--+
//   +----+    Copyright (c) 2012 Code Red Technologies Ltd.
//
// LPC8xx Microcontroller Startup code for use with Red Suite
//
// Version : 121107
//
// Software License Agreement
//
// The software is owned by Code Red Technologies and/or its suppliers, and is
// protected under applicable copyright laws.  All rights are reserved.  Any
// use in violation of the foregoing restrictions may subject the user to criminal
// sanctions under applicable laws, as well as to civil liability for the breach
// of the terms and conditions of this license.
//
// THIS SOFTWARE IS PROVIDED "AS IS".  NO WARRANTIES, WHETHER EXPRESS, IMPLIED
// OR STATUTORY, INCLUDING, BUT NOT LIMITED TO, IMPLIED WARRANTIES OF
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE APPLY TO THIS SOFTWARE.
// USE OF THIS SOFTWARE FOR COMMERCIAL DEVELOPMENT AND/OR EDUCATION IS SUBJECT
// TO A CURRENT END USER LICENSE AGREEMENT (COMMERCIAL OR EDUCATIONAL) WITH
// CODE RED TECHNOLOGIES LTD.
//
//*****************************************************************************
#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)
//#include "LPC8xx.h"
//#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);

void vPortSVCHandler(void);
void xPortPendSVHandler(void);
void xPortSysTickHandler(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 SPI0_IRQHandler(void) ALIAS(IntDefaultHandler);
void SPI1_IRQHandler(void) ALIAS(IntDefaultHandler);
void UART0_IRQHandler(void) ALIAS(IntDefaultHandler);
void UART1_IRQHandler(void) ALIAS(IntDefaultHandler);
void UART2_IRQHandler(void) ALIAS(IntDefaultHandler);
void I2C_IRQHandler(void) ALIAS(IntDefaultHandler);
void SCT_IRQHandler(void) ALIAS(IntDefaultHandler);
void MRT_IRQHandler(void) ALIAS(IntDefaultHandler);
void CMP_IRQHandler(void) ALIAS(IntDefaultHandler);
void WDT_IRQHandler(void) ALIAS(IntDefaultHandler);
void BOD_IRQHandler(void) ALIAS(IntDefaultHandler);
void WKT_IRQHandler(void) ALIAS(IntDefaultHandler);
void PININT0_IRQHandler(void) ALIAS(IntDefaultHandler);
void PININT1_IRQHandler(void) ALIAS(IntDefaultHandler);
void PININT2_IRQHandler(void) ALIAS(IntDefaultHandler);
void PININT3_IRQHandler(void) ALIAS(IntDefaultHandler);
void PININT4_IRQHandler(void) ALIAS(IntDefaultHandler);
void PININT5_IRQHandler(void) ALIAS(IntDefaultHandler);
void PININT6_IRQHandler(void) ALIAS(IntDefaultHandler);
void PININT7_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.
// This relies on the linker script to place at correct location in memory.
//
//*****************************************************************************
extern void (* const g_pfnVectors[])(void);
__attribute__ ((section(".isr_vector")))
void (* const g_pfnVectors[])(void) = {
 // Core Level - CM0plus
 &_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
 vPortSVCHandler,    // FreeRTOS SVCall Handler
 0,        // Reserved
 0,        // Reserved
 xPortPendSVHandler,    // FreeRTOS PendSV Handler
 xPortSysTickHandler,   // FreeRTOS SysTick Handler

 // Chip Level - LPC8xx
    SPI0_IRQHandler,                         // SPI0 controller
    SPI1_IRQHandler,                         // SPI1 controller
    0,                                       // Reserved
    UART0_IRQHandler,                        // UART0
    UART1_IRQHandler,                        // UART1
    UART2_IRQHandler,                        // UART2
    0,                                       // Reserved
    0,                                       // Reserved
    I2C_IRQHandler,                          // I2C controller
    SCT_IRQHandler,                          // Smart Counter Timer
    MRT_IRQHandler,                          // Multi-Rate Timer
    CMP_IRQHandler,                          // Comparator
    WDT_IRQHandler,                          // PIO1 (0:11)
    BOD_IRQHandler,                          // Brown Out Detect
    0,                                       // Reserved
    WKT_IRQHandler,                          // Wakeup timer
    0,                                       // Reserved
    0,                                       // Reserved
    0,                                       // Reserved
    0,                                       // Reserved
    0,                                       // Reserved
    0,                                       // Reserved
    0,                                       // Reserved
    0,                                       // Reserved
    PININT0_IRQHandler,                      // PIO INT0
    PININT1_IRQHandler,                      // PIO INT1
    PININT2_IRQHandler,                      // PIO INT2
    PININT3_IRQHandler,                      // PIO INT3
    PININT4_IRQHandler,                      // PIO INT4
    PININT5_IRQHandler,                      // PIO INT5
    PININT6_IRQHandler,                      // PIO INT6
    PININT7_IRQHandler,                      // PIO INT7

}; /* 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")))
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);
 }
 extern void SystemInit(void);
 SystemInit();

#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 SVCall_Handler(void)
{
    while(1)
    {
    }
}
__attribute__ ((section(".after_vectors")))
void PendSV_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)
    {
    }
}