Jumping to Application

[Lori B.]

Posted on May 13, 2014 at 16:53

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!

[Lori B.]

Posted on May 22, 2014 at 11:26

Any help\suggestion? Thank you..

[chen]

Posted on May 22, 2014 at 11:42

I could have swan I replied to this already! Must be the damn forum not accepting my replies again.

''After my main app launches, I get stucked in the USBH_OTG_ISR_Handler I think that this is because I don' DeInit the USB properly before the jump! I wrote a function USBH_Stop(&USB_OTG_Core,&USB_Host)'' I think the problem is the USB stop that you are doing. Instead try a USB soft Disconnect : void USB_SoftDisconnect( void ) {     // set bit SDIS in OTG_FS_DCTL reg     USB_OTG_dev.regs.DREGS->DCTL |= 0x02; }

[Lori B.]

Posted on May 22, 2014 at 12:25

Ahah, no problem! You are too kind!

Did you mean something like this? void USB_SoftDisconnect( USB_OTG_CORE_HANDLE *pdev ) {     // set bit SDIS in OTG_FS_DCTL reg     pdev->regs.DREGS->DCTL |= 0x02; } USB_SoftDisconnect( &USB_OTG_Core); I tried! Doing so, I get an hard falut starting my app, instead of going into the otg_handler. Not sure if better or worse! (I think worse)

[chen]

Posted on May 22, 2014 at 13:27

''I tried! Doing so, I get an hard falut starting my app, instead of going into the otg_handler.

Not sure if better or worse! (I think worse)'' It is better I think. Before, your bootloader was stuck due to USB IRQ. Now, your bootloader has started the application but you get a HardFault in Application. Debug your application. Find out why you get hard fault. (See if SysTick IRQ happens before it is set up - this happened to me).

[Lori B.]

Posted on May 22, 2014 at 17:32

Actually it was stuck in the USB Handler, but already in the app, not in the bootloader!

Anyway I finally made it! The problem was related to the interrupts. __disable_irq(); suspend all interrups but does not act on the registers, so as soon as something in the App sets an interrupt, everything start acting random! I solved it writing this function and calling it just before the jump! void USB_Interface_DeInit(void){     RCC_AHB1PeriphClockCmd( RCC_AHB1Periph_OTG_HS, ENABLE);     RCC_AHB1PeriphResetCmd( RCC_AHB1Periph_OTG_HS, DISABLE);     RCC_AHB1PeriphClockCmd( RCC_AHB1Periph_OTG_HS, DISABLE);         nvicStructure.NVIC_IRQChannel = OTG_HS_IRQn;     nvicStructure.NVIC_IRQChannelPreemptionPriority = 15;     nvicStructure.NVIC_IRQChannelSubPriority = 0;     nvicStructure.NVIC_IRQChannelCmd = DISABLE;     NVIC_Init(&nvicStructure); } Thank you again!!

[Tesla DeLorean]

Posted on May 22, 2014 at 18:25

I'm going to cross link this thread, as it picked up the SVC topic, and had similar issue with disabling interrupts vs servicing them in the application.

https://community.st.com/0D50X00009XkiGuSAJ

 

EDIT: Fixed DEAD LINK, Original from 22-May-2014