Synergy CORTEX M 启动流程

1、启动文件“startup_S7G2.c”

　　中断向量表地址指针：“0xe000ed08”

/* Vector table. */
BSP_DONT_REMOVE const exc_ptr_t __Vectors[BSP_CORTEX_VECTOR_TABLE_ENTRIES] BSP_PLACE_IN_SECTION(BSP_SECTION_VECTOR) =
{
    (exc_ptr_t)(&g_main_stack[0] + BSP_CFG_STACK_MAIN_BYTES),           /*      Initial Stack Pointer     */
    Reset_Handler,                                                      /*      Reset Handler             */
    NMI_Handler,                                                        /*      NMI Handler               */
    HardFault_Handler,                                                  /*      Hard Fault Handler        */
    MemManage_Handler,                                                  /*      MPU Fault Handler         */
    BusFault_Handler,                                                   /*      Bus Fault Handler         */
    UsageFault_Handler,                                                 /*      Usage Fault Handler       */
    0,                                                                  /*      Reserved                  */
    0,                                                                  /*      Reserved                  */
    0,                                                                  /*      Reserved                  */
    0,                                                                  /*      Reserved                  */
    SVC_Handler,                                                        /*      SVCall Handler            */
    DebugMon_Handler,                                                   /*      Debug Monitor Handler     */
    0,                                                                  /*      Reserved                  */
    PendSV_Handler,                                                     /*      PendSV Handler            */
    SysTick_Handler,                                                    /*      SysTick Handler           */
};

2、“入口函数”在“链接脚本”中配置，S7G2.ld

/* Linker script to configure memory regions. */
MEMORY
{
  FLASH (rx)         : ORIGIN = 0x00000000, LENGTH = 0x0040000  /* 256K */
  RAM (rwx)          : ORIGIN = 0x1FFE0000, LENGTH = 0x00A0000  /* 640K */
  DATA_FLASH (rx)    : ORIGIN = 0x40100000, LENGTH = 0x0010000  /*  64K */
  QSPI_FLASH (rx)    : ORIGIN = 0x60000000, LENGTH = 0x0800000  /*   8M, Change in QSPI section below also */
  SDRAM (rwx)        : ORIGIN = 0x90000000, LENGTH = 0x2000000  /*  32M */
}

ENTRY(Reset_Handler)

入口函数如下：

/***********************************************************************************************************************
* Function Name: Reset_Handler
* Description  : MCU starts executing here out of reset. Main stack pointer is setup already.
* Arguments    : none
* Return Value : none
***********************************************************************************************************************/
void Reset_Handler (void)
{
    /* Initialize system using BSP. */
    SystemInit();

    /* Call user application. */
    main();

    while (1)
    {
        /* Infinite Loop. */
    }
}

HOOK设置 R_BSP_WarmStart()，用户可以有机会在“main()”执行前加入自己的操作。如：BOOT下判断是否有OTA升级。

void SystemInit (void)
{
#if ( defined ( __GNUC__ ) && defined (__VFP_FP__) && !defined (__SOFTFP__) ) || 
    ( defined ( __ICCARM__ ) && defined ( __ARMVFP__ ) && (__FPU_PRESENT == 1) )

    /* Enable the Cortex-M4 FPU only when -mfloat-abi=hard.
       Code taken from Section 7.1, Cortex-M4 TRM (DDI0439C) */

    /* Set bits 20-23 to enable CP10 and CP11 coprocessor */

    /*LDRA_NOANALYSIS LDRA_INSPECTED below not working. */
    /*LDRA_INSPECTED 96 S *//*LDRA_INSPECTED 93 S SCB is a CMSIS defined element over which we have no control.*/
    SCB->CPACR = (uint32_t)((uint32_t)SCB->CPACR | (uint32_t)CP_MASK);
    /*LDRA_ANALYSIS */
#endif

    /* Call Pre C runtime initialization hook. */
    R_BSP_WarmStart(BSP_WARM_START_PRE_C);

    /* Initialize grouped interrupts. */
    bsp_group_interrupt_open();

    /* Initialize FMI. */
    g_fmi_on_fmi.init();

    /* Initialize register protection. */
    bsp_register_protect_open();

    /* Configure system clocks using CGC module. */
    bsp_clock_init();

    /* Temporary fix to initialize ioport reference counter to 0, needed before C runtime init. This will be removed
     * in the next release in favor of a more complete solution. */
    HW_IOPORT_Init_Reference_Counter();

    /* Initialize pins. */
    g_ioport_on_ioport.init(&g_bsp_pin_cfg);

    /* Initialize C runtime environment. */
    /* Zero out BSS */
#if defined(__GNUC__)
    bsp_section_zero((uint8_t *)&__bss_start__, ((uint32_t)&__bss_end__ - (uint32_t)&__bss_start__));
#elif defined(__ICCARM__)
    bsp_section_zero((uint8_t *)__section_begin(".bss"), (uint32_t)__section_size(".bss"));
#endif

    /* Copy initialized RAM data from ROM to RAM. */
#if defined(__GNUC__)
    bsp_section_copy((uint8_t *)&__etext,
                     (uint8_t *)&__data_start__,
                     ((uint32_t)&__data_end__ - (uint32_t)&__data_start__));
#elif defined(__ICCARM__)
    bsp_section_copy((uint8_t *)__section_begin(".data_init"),
                     (uint8_t *)__section_begin(".data"),
                     (uint32_t)__section_size(".data"));
    /* Copy functions to be executed from RAM. */
    #pragma section=".code_in_ram"
    #pragma section=".code_in_ram_init"
    bsp_section_copy((uint8_t *)__section_begin(".code_in_ram_init"),
                     (uint8_t *)__section_begin(".code_in_ram"),
                     (uint32_t)__section_size(".code_in_ram"));
    /* Copy main thread TLS to RAM. */
    #pragma section="__DLIB_PERTHREAD_init"
    #pragma section="__DLIB_PERTHREAD"
    bsp_section_copy((uint8_t *)__section_begin("__DLIB_PERTHREAD_init"),
                     (uint8_t *)__section_begin("__DLIB_PERTHREAD"),
                     (uint32_t)__section_size("__DLIB_PERTHREAD_init"));
#endif

    /* Initialize SystemCoreClock variable. */
    SystemCoreClockUpdate();

    /* Call Post C runtime initialization hook. */
    R_BSP_WarmStart(BSP_WARM_START_POST_C);

    /* Initialize Static Constructors */
#if defined(__GNUC__)
    /*LDRA_INSPECTED 219 S In the GCC compiler, __init_array_start and __init_array_end starts with underscore. */
    /*LDRA_INSPECTED 219 S */
    int32_t count = __init_array_end - __init_array_start;
    for (int32_t i = 0; i < count; i++)
    {
        __init_array_start [i]();
    }
#elif defined(__ICCARM__)
    void const * pibase = __section_begin("SHT$$PREINIT_ARRAY");
    void const * ilimit = __section_end("SHT$$INIT_ARRAY");
    __call_ctors(pibase, ilimit);
#endif

    /* Initialize the Hardware locks to 'Unlocked' */
    bsp_init_hardware_locks();

    /* Initialize ELC events that will be used to trigger NVIC interrupts. */
    bsp_irq_cfg();

    /* Initialize ELC. */
    g_elc_on_elc.init(&g_elc_cfg);

    /* Call any BSP specific code. No arguments are needed so NULL is sent. */
    bsp_init(NULL);
}

R_BSP_WarmStart()下实现的“BCH”升级

void R_BSP_WarmStart (bsp_warm_start_event_t event)
{
    if (BSP_WARM_START_PRE_C == event)
    {
        /* C runtime environment has not been setup so you cannot use globals. System clocks and pins are not setup. */
    }

    else if (BSP_WARM_START_POST_C == event)
    {
        /* if S5 is pressed */
        if (0 == ((R_IOPORT0->PCNTR2 >> 5) & 0x1))
        {
            boot_status = 1;
        }

        /* if S4 is pressed */
        else if (0 == ((R_IOPORT0->PCNTR2 >> 6) & 0x1))
        {
            boot_status = 0;
        }

        /* if S4 and S5 are not pressed */
        else
        {
            /* Initialize the Hardware locks to 'Unlocked' */
            bsp_init_hardware_locks();

            ssp_err_t status;

            status = g_sf_bootloader_mcu.p_api->open(g_sf_bootloader_mcu.p_ctrl, g_sf_bootloader_mcu.p_cfg);
            if (!status)
            {
                status = g_sf_bootloader_mcu.p_api->appStart(g_sf_bootloader_mcu.p_ctrl);
                if (status)
                {
                    /* Notify the bootloader that appStart failed */
                    boot_status = 1;

                    g_sf_bootloader_mcu.p_api->close(g_sf_bootloader_mcu.p_ctrl);
                }
            }

            else
            {
                /* Notify the bootloader that open failed */
                boot_status = 1;
            }
        }
    }

    else
    {
        /* Do nothing */
    }
}

当然也可以判断DATA FLASH数据作为是否升级的依据：