- //定义一个函数类型的参数.这里iapfun是一个函数指针
- typedef void (*iapfun)(void);
-
- //跳转到应用程序段
- //appxaddr:用户代码起始地址.
- void iap_load_app(uint32_t appxaddr)
- {
- iapfun jump2app;//定义一个函数指针变量
-
- __disable_irq();
-
- if(((*(__IO uint32_t*)appxaddr)&0x2FFE0000)==0x20000000) //检查栈顶地址是否合法.
- {
- //HAL_NVIC_DisableIRQ(DMA1_Channel2_3_IRQn);
- //HAL_NVIC_DisableIRQ(DMA1_Channel4_5_6_7_IRQn);
- //HAL_NVIC_DisableIRQ(USART1_IRQn);
- //HAL_NVIC_DisableIRQ(USART2_IRQn);
- //HAL_NVIC_DisableIRQ(USART3_4_IRQn);
- //HAL_NVIC_DisableIRQ(SysTick_IRQn);
-
-
- //函数指针实例化，给指针赋值，APP代码区第二个字内存的数据为程序开始地址(复位地址)
- jump2app=(iapfun)*(__IO uint32_t*)(appxaddr+4);
-
- //初始化APP堆栈指针(APP代码区的第一个字内存的数据为栈顶地址)
- __set_MSP(*(__IO uint32_t*)appxaddr);
-
- //跳转到APP.函数指针在前面已经实例化，这里直接用
- jump2app();
- }
-
- }
-
-
- /**
- \brief Set Main Stack Pointer
- \details Assigns the given value to the Main Stack Pointer (MSP).
- \param [in] topOfMainStack Main Stack Pointer value to set
- */
- __STATIC_INLINE void __set_MSP(uint32_t topOfMainStack)
- {
- register uint32_t __regMainStackPointer __ASM("msp");
- __regMainStackPointer = topOfMainStack;
- }/**
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