cr_startup_lpc43xx.c

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//*****************************************************************************
// LPC43xx (Cortex-M4) Microcontroller Startup code for use with LPCXpresso IDE
//
// Version : 150706
//*****************************************************************************
//
// Copyright(C) NXP Semiconductors, 2013-2015, 2020
// All rights reserved.
//
// NXP Confidential. This software is owned or controlled by NXP and may only be
// used strictly in accordance with the applicable license terms.
//
// By expressly accepting such terms or by downloading, installing, activating
// and/or otherwise using the software, you are agreeing that you have read, and
// that you agree to comply with and are bound by, such license terms.
// 
// If you do not agree to be bound by the applicable license terms, then you may not
// retain, install, activate or otherwise use the software.
//*****************************************************************************
 
#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 (__cplusplus)
extern "C" {
#endif
 
//*****************************************************************************
#if defined (__USE_CMSIS) || defined (__USE_LPCOPEN)
// Declaration of external SystemInit function
extern void SystemInit(void);
#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 MemManage_Handler(void);
WEAK void BusFault_Handler(void);
WEAK void UsageFault_Handler(void);
WEAK void SVC_Handler(void);
WEAK void DebugMon_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 DAC_IRQHandler(void) ALIAS(IntDefaultHandler);
#if defined (__USE_LPCOPEN)
void M0APP_IRQHandler(void) ALIAS(IntDefaultHandler);
#else
void M0CORE_IRQHandler(void) ALIAS(IntDefaultHandler);
#endif
void DMA_IRQHandler(void) ALIAS(IntDefaultHandler);
void FLASH_EEPROM_IRQHandler(void) ALIAS(IntDefaultHandler);
void ETH_IRQHandler(void) ALIAS(IntDefaultHandler);
void SDIO_IRQHandler(void) ALIAS(IntDefaultHandler);
void LCD_IRQHandler(void) ALIAS(IntDefaultHandler);
void USB0_IRQHandler(void) ALIAS(IntDefaultHandler);
void USB1_IRQHandler(void) ALIAS(IntDefaultHandler);
void SCT_IRQHandler(void) ALIAS(IntDefaultHandler);
void RIT_IRQHandler(void) ALIAS(IntDefaultHandler);
void TIMER0_IRQHandler(void) ALIAS(IntDefaultHandler);
void TIMER1_IRQHandler(void) ALIAS(IntDefaultHandler);
void TIMER2_IRQHandler(void) ALIAS(IntDefaultHandler);
void TIMER3_IRQHandler(void) ALIAS(IntDefaultHandler);
void MCPWM_IRQHandler(void) ALIAS(IntDefaultHandler);
void ADC0_IRQHandler(void) ALIAS(IntDefaultHandler);
void I2C0_IRQHandler(void) ALIAS(IntDefaultHandler);
void SPI_IRQHandler(void) ALIAS(IntDefaultHandler);
void I2C1_IRQHandler(void) ALIAS(IntDefaultHandler);
void ADC1_IRQHandler(void) ALIAS(IntDefaultHandler);
void SSP0_IRQHandler(void) ALIAS(IntDefaultHandler);
void SSP1_IRQHandler(void) ALIAS(IntDefaultHandler);
void UART0_IRQHandler(void) ALIAS(IntDefaultHandler);
void UART1_IRQHandler(void) ALIAS(IntDefaultHandler);
void UART2_IRQHandler(void) ALIAS(IntDefaultHandler);
void UART3_IRQHandler(void) ALIAS(IntDefaultHandler);
void I2S0_IRQHandler(void) ALIAS(IntDefaultHandler);
void I2S1_IRQHandler(void) ALIAS(IntDefaultHandler);
void SPIFI_IRQHandler(void) ALIAS(IntDefaultHandler);
void SGPIO_IRQHandler(void) ALIAS(IntDefaultHandler);
void GPIO0_IRQHandler(void) ALIAS(IntDefaultHandler);
void GPIO1_IRQHandler(void) ALIAS(IntDefaultHandler);
void GPIO2_IRQHandler(void) ALIAS(IntDefaultHandler);
void GPIO3_IRQHandler(void) ALIAS(IntDefaultHandler);
void GPIO4_IRQHandler(void) ALIAS(IntDefaultHandler);
void GPIO5_IRQHandler(void) ALIAS(IntDefaultHandler);
void GPIO6_IRQHandler(void) ALIAS(IntDefaultHandler);
void GPIO7_IRQHandler(void) ALIAS(IntDefaultHandler);
void GINT0_IRQHandler(void) ALIAS(IntDefaultHandler);
void GINT1_IRQHandler(void) ALIAS(IntDefaultHandler);
void EVRT_IRQHandler(void) ALIAS(IntDefaultHandler);
void CAN1_IRQHandler(void) ALIAS(IntDefaultHandler);
#if defined (__USE_LPCOPEN)
void ADCHS_IRQHandler(void) ALIAS(IntDefaultHandler);
#else
void VADC_IRQHandler(void) ALIAS(IntDefaultHandler);
#endif
void ATIMER_IRQHandler(void) ALIAS(IntDefaultHandler);
void RTC_IRQHandler(void) ALIAS(IntDefaultHandler);
void WDT_IRQHandler(void) ALIAS(IntDefaultHandler);
void M0SUB_IRQHandler(void) ALIAS(IntDefaultHandler);
void CAN0_IRQHandler(void) ALIAS(IntDefaultHandler);
void QEI_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);
 
//*****************************************************************************
//
// 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);
__attribute__ ((used,section(".isr_vector")))
void (* const g_pfnVectors[])(void) = {
    // Core Level - CM4
    &_vStackTop,                    // The initial stack pointer
    ResetISR,                       // The reset handler
    NMI_Handler,                    // The NMI handler
    HardFault_Handler,              // The hard fault handler
    MemManage_Handler,              // The MPU fault handler
    BusFault_Handler,               // The bus fault handler
    UsageFault_Handler,             // The usage fault handler
    __valid_user_code_checksum,             // LPC MCU Checksum
    0,                              // Reserved
    0,                              // Reserved
    0,                              // Reserved
    SVC_Handler,                    // SVCall handler
    DebugMon_Handler,               // Debug monitor handler
    0,                              // Reserved
    PendSV_Handler,                 // The PendSV handler
    SysTick_Handler,                // The SysTick handler
 
    // Chip Level - LPC43 (M4)
    DAC_IRQHandler,           // 16
#if defined (__USE_LPCOPEN)
    M0APP_IRQHandler,         // 17 CortexM4/M0 (LPC43XX ONLY)
#else
    M0CORE_IRQHandler,        // 17
#endif
    DMA_IRQHandler,           // 18
    0,           // 19
    FLASH_EEPROM_IRQHandler,  // 20 ORed flash Bank A, flash Bank B, EEPROM interrupts
    ETH_IRQHandler,           // 21
    SDIO_IRQHandler,          // 22
    LCD_IRQHandler,           // 23
    USB0_IRQHandler,          // 24
    USB1_IRQHandler,          // 25
    SCT_IRQHandler,           // 26
    RIT_IRQHandler,           // 27
    TIMER0_IRQHandler,        // 28
    TIMER1_IRQHandler,        // 29
    TIMER2_IRQHandler,        // 30
    TIMER3_IRQHandler,        // 31
    MCPWM_IRQHandler,         // 32
    ADC0_IRQHandler,          // 33
    I2C0_IRQHandler,          // 34
    I2C1_IRQHandler,          // 35
    SPI_IRQHandler,           // 36
    ADC1_IRQHandler,          // 37
    SSP0_IRQHandler,          // 38
    SSP1_IRQHandler,          // 39
    UART0_IRQHandler,         // 40
    UART1_IRQHandler,         // 41
    UART2_IRQHandler,         // 42
    UART3_IRQHandler,         // 43
    I2S0_IRQHandler,          // 44
    I2S1_IRQHandler,          // 45
    SPIFI_IRQHandler,         // 46
    SGPIO_IRQHandler,         // 47
    GPIO0_IRQHandler,         // 48
    GPIO1_IRQHandler,         // 49
    GPIO2_IRQHandler,         // 50
    GPIO3_IRQHandler,         // 51
    GPIO4_IRQHandler,         // 52
    GPIO5_IRQHandler,         // 53
    GPIO6_IRQHandler,         // 54
    GPIO7_IRQHandler,         // 55
    GINT0_IRQHandler,         // 56
    GINT1_IRQHandler,         // 57
    EVRT_IRQHandler,          // 58
    CAN1_IRQHandler,          // 59
    0,                        // 60
#if defined (__USE_LPCOPEN)
    ADCHS_IRQHandler,         // 61 ADCHS combined interrupt
#else
    VADC_IRQHandler,          // 61
#endif
    ATIMER_IRQHandler,        // 62
    RTC_IRQHandler,           // 63
    0,                        // 64
    WDT_IRQHandler,           // 65
    M0SUB_IRQHandler,         // 66
    CAN0_IRQHandler,          // 67
    QEI_IRQHandler,           // 68
};
 
 
//*****************************************************************************
// 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.
//
//*****************************************************************************
void ResetISR(void) {
 
// *************************************************************
// The following conditional block of code manually resets as
// much of the peripheral set of the LPC43 as possible. This is
// done because the LPC43 does not provide a means of triggering
// a full system reset under debugger control, which can cause
// problems in certain circumstances when debugging.
//
// You can prevent this code block being included if you require
// (for example when creating a final executable which you will
// not debug) by setting the define 'DONT_RESET_ON_RESTART'.
//
#ifndef DONT_RESET_ON_RESTART
 
    // Disable interrupts
    __asm volatile ("cpsid i");
    // equivalent to CMSIS '__disable_irq()' function
 
    unsigned int *RESET_CONTROL = (unsigned int *) 0x40053100;
    // LPC_RGU->RESET_CTRL0 @ 0x40053100
    // LPC_RGU->RESET_CTRL1 @ 0x40053104
    // Note that we do not use the CMSIS register access mechanism,
    // as there is no guarantee that the project has been configured
    // to use CMSIS.
 
    // Write to LPC_RGU->RESET_CTRL0
    *(RESET_CONTROL + 0) = 0x10DF1000;
    // GPIO_RST|AES_RST|ETHERNET_RST|SDIO_RST|DMA_RST|
    // USB1_RST|USB0_RST|LCD_RST|M0_SUB_RST
 
    // Write to LPC_RGU->RESET_CTRL1
    *(RESET_CONTROL + 1) = 0x01DFF7FF;
    // M0APP_RST|CAN0_RST|CAN1_RST|I2S_RST|SSP1_RST|SSP0_RST|
    // I2C1_RST|I2C0_RST|UART3_RST|UART1_RST|UART1_RST|UART0_RST|
    // DAC_RST|ADC1_RST|ADC0_RST|QEI_RST|MOTOCONPWM_RST|SCT_RST|
    // RITIMER_RST|TIMER3_RST|TIMER2_RST|TIMER1_RST|TIMER0_RST
 
    // Clear all pending interrupts in the NVIC
    volatile unsigned int *NVIC_ICPR = (unsigned int *) 0xE000E280;
    unsigned int irqpendloop;
    for (irqpendloop = 0; irqpendloop < 8; irqpendloop++) {
        *(NVIC_ICPR + irqpendloop) = 0xFFFFFFFF;
    }
 
    // Reenable interrupts
    __asm volatile ("cpsie i");
    // equivalent to CMSIS '__enable_irq()' function
 
#endif  // ifndef DONT_RESET_ON_RESTART
// *************************************************************
 
#if defined (__USE_LPCOPEN)
    SystemInit();
#endif
 
    //
    // 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_LPCOPEN)
// LPCOpen init code deals with FP and VTOR initialisation
#if defined (__VFP_FP__) && !defined (__SOFTFP__)
    /*
     * Code to enable the Cortex-M4 FPU only included
     * if appropriate build options have been selected.
     * Code taken from Section 7.1, Cortex-M4 TRM (DDI0439C)
     */
    // CPACR is located at address 0xE000ED88
    asm("LDR.W R0, =0xE000ED88");
    // Read CPACR
    asm("LDR R1, [R0]");
    // Set bits 20-23 to enable CP10 and CP11 coprocessors
    asm(" ORR R1, R1, #(0xF << 20)");
    // Write back the modified value to the CPACR
    asm("STR R1, [R0]");
#endif // (__VFP_FP__) && !(__SOFTFP__)
    // ******************************
    // 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.
 
    // Note that we do not use the CMSIS register access mechanism,
    // as there is no guarantee that the project has been configured
    // to use CMSIS.
    unsigned int * pSCB_VTOR = (unsigned int *) 0xE000ED08;
    if ((unsigned int *) g_pfnVectors != (unsigned int *) 0x00000000) {
        // CMSIS : SCB->VTOR = <address of vector table>
        *pSCB_VTOR = (unsigned int) g_pfnVectors;
    }
#endif
 
#if defined (__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 MemManage_Handler(void) {
    while (1) {
    }
}
__attribute__ ((section(".after_vectors")))
void BusFault_Handler(void) {
    while (1) {
    }
}
__attribute__ ((section(".after_vectors")))
void UsageFault_Handler(void) {
    while (1) {
    }
}
__attribute__ ((section(".after_vectors")))
void SVC_Handler(void) {
    while (1) {
    }
}
__attribute__ ((section(".after_vectors")))
void DebugMon_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) {
    }
}