interference between IAP and user application

[issa]

Posted on March 05, 2014 at 10:29

Hi,

I can't use the same timer in IAP code and user application code in the same time, even if I reset all registers and interrupts concerning this timer before jump to user application address. Note that I reallocated the vector table for the user application...Thank you

[chen]

Posted on March 05, 2014 at 15:08

Hi

''I can't use the same timer in IAP code and user application code in the same time'' When you say IAP - In Application Programming. Do you mean that you have written your own bootloader? ''I reset all registers and interrupts concerning this timer before jump to user application '' In general - it is a good idea to disable and re-configure all peripherals to be used in each application during startup. In the case of the timer - the timer must be disabled first before some of its registers can be changed (or the change take effect).

[Tesla DeLorean]

Posted on March 05, 2014 at 15:58

Ok, should we guess what part you're using, and the code you constructed that is failing?

[issa]

Posted on March 06, 2014 at 07:24

Hi again,

Thank you for your replies,Yes it's my own bootloader. I am using STM32F105, and this is the way I reset all timer registers and the USB peripheral before jumping to the main application...if (((*(__IO uint32_t*)ApplicationAddress) & 0x2FFE0000 ) == 0x20000000){  /* Reset all registers used in System file */       NVIC_DisableIRQ(TIM3_IRQn);     RCC->APB1ENR &=~RCC_APB1ENR_TIM3EN;      TIM3->CR1 = 0;                                          // reset command register 1     TIM3->CR2 = 0;                                          // reset command register 2     TIM3->PSC = 0;     TIM3->ARR = 0;     TIM3->DIER =0;                               // disable interrupt     TIM3->CNT=0;     TIM3->SR=0; /* Disable the USB clock */     RCC_APB1PeriphClockCmd((uint32_t)0x00800000, DISABLE);      OTGD_FS_Handle_UsbReset_ISR();      PowerOff();       /* Jump to user application */     JumpAddress = *(__IO uint32_t*) (ApplicationAddress + 4);     Jump_To_Application = (pFunction) JumpAddress; /* Initialize user application's Stack Pointer */     __set_MSP(*(__IO uint32_t*) ApplicationAddress);     Jump_To_Application();    }Note the USB causes the same problem, it seems it still working and when I plug in a USB cable, the main application crushes and after 3 resets the bootloader works again automatically ...thank you

[Tesla DeLorean]

Posted on March 06, 2014 at 07:40

You might want to try programming the TIM3 registers BEFORE disabling the clock to the peripheral, as the writes definitely won't work after the clock is stopped.

[issa]

Posted on March 06, 2014 at 08:25

Thank you cliv1, you are right about Timer3... can you help me about how to disable correctly the USB??

[chen]

Posted on March 06, 2014 at 10:32

Hi

I found the USB stack from the USB OTG does re-initialise OK. The issue is to do with disconnection - you will need to force a software disconnect. Depending on your processor, something like     // force a USB soft disconnect     // USB_OTG_dev.regs.DREGS->DCTL |= 0x02;

[issa]

Posted on March 06, 2014 at 10:52

Thank you sung.chen_chung, that is what I did and it solved my problem ...