Posted on September 07, 2016 at 10:36
If I stop programm execution while in system memory and check SYSCFG_MEMRMP it contains 0, i.e. 00: Main Flash memory mapped at 0x0000 0000.I don't understand why this is happening. Can anybody help me? Perhaps someone faced with such behavior.
My software project has 2 parts:
- bootloader located at 0x08000000;- application located at 0x08008000.After reset bootloader is started and check CAN network - if there is activity it can reload application. Also I use NVIC_SystemReset() function to switch from bootloader to applicatyion, and from application to bootloder.In Application, if I want to load new program used function:void EnterProgramMode( void ){ __disable_irq(); *(uint32_t*)CheckAddress = 0xAAAAAAAA; __asm volatile (''nop''); NVIC_SystemReset();}In bootloder, if I want start application:void StartApplication(void){ __disable_irq(); *(unsigned long*)CheckAddress = 0; __asm volatile (''nop''); NVIC_SystemReset();}So after system reset bootloder can check CheckAddress value and decide what it need to do: run application (if it has 0xAAAAAAAA) or load program (if 0).But I have a problem in bootloder.While debugging if I set breakpoint at any line of StartApplication-function - all fine. After CPU resets and stopes at breakpoint in Reset_Handler function. But if I remove (or diable) breakpoint in StartApplication-function - reset occured but program goes to 0x1FFF0000 area. It seems like after startup ''Boot from system memory'' mode were selected.But Boot1-pin connected to GND, Boot0-pin pulled-down over 10k resistor, XP6 jumper removed (see attached picture). I tried to check Boot0-pin with oscilloscope and it is 0 every time.If I stop programm execution while in system memory and check SYSCFG_MEMRMP it contains 0, i.e. 00: Main Flash memory mapped at 0x0000 0000.I don't understand why this is happening. Can anybody help me? Perhaps someone faced with such behavior.
