AnsweredAssumed Answered

Jumping to Application

Question asked by Lori B. on May 13, 2014
Latest reply on May 22, 2014 by Clive One
Hi, I'm quite new with the ARM and STM32 world.
I'm developing an application wich has to load a bootloader and, at a certain point, jump to the main application. I'm using the STM32F4-Disco.
The bootload is quite complex, using FreeRTOS and STemWin, comunicating to an external device with USART periph.
Using a USB OTG drive which han an image.bin file on it (which is the main app code), I load it to a flash memory sector that for me is
APPLICATION_ADDRESS (uint32_t)0x08080000
 and then press a button on the touch-LCD for jumping to the loaded code.
The jumping function is:

cmd_Jump_To_Application(APPLICATION_ADDRESS)


void cmd_Jump_To_Application(uint32_t start_Address)
        {
                    USART_DeInit(USART2);
                    USART_DeInit(USART1);
                    RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, ENABLE);
                    RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, DISABLE);
                    RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, ENABLE);
                    RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, DISABLE);
                    RCC_DeInit();
                    __disable_irq();       

        uint32_t addressToJump = *(__IO uint32_t*) (start_Address + 4);
        pFunction Jump_To_Application = (pFunction) addressToJump;
    
         /* Initialize application's Stack Pointer */
         __set_MSP(*(__IO uint32_t*) start_Address);   

         /* Call Reset Handler */
         Jump_To_Application();
        }

Assuming that the downloading part to flash memory is right (I ported from the FW_Upgrade example, and debugging I can see what I expect in the application sector), there is something wrong. When I press the jump button I get a white screen and everything freezing and I can't start the main application.
I'm missing something for sure, maybe about stack or some other vector adress\init, but I can't understand what. Some suggestions? Thanks!

Outcomes