MQX lite and bootlaoder

[danielecortella]

Hi all,

i have a device with a uTasker Bootlader an MQX lite. I have change the Memory map of the firmware :

MEMORY {

  m_interrupts (RX) : ORIGIN = 0x00008080, LENGTH = 0x00000200

  m_cfmprotrom (RX) : ORIGIN = 0x00008400, LENGTH = 0x00000010

  m_text      (RX) : ORIGIN = 0x00008410, LENGTH = 0x00037BF0

  m_data      (RW) : ORIGIN = 0x1FFFE200, LENGTH = 0x00007E00

}

I know that MQX can copy the interrupt to RAM with the setting MQX_ROM_VECTORS set to 0 in user_config.h. This is necessary for a correct functioning because at 0x00 address i have the bootlaoder. Although this setting the system crash as visible in the image when is execute

 #ifdef PEX_RTOS_INIT
    PEX_RTOS_INIT();                   /* Initialization of the selected RTOS. Macro is defined by the RTOS component. */
  #endif

in PE_low_level_init.

Thanks

PS: the system crash in

void _psp_int_install(void)
{
    KERNEL_DATA_STRUCT_PTR kernel_data;
    _GET_KERNEL_DATA(kernel_data);
    __set_MSP((uint_32)kernel_data->INTERRUPT_STACK_PTR);
#if !MQX_ROM_VECTORS
    {
        uint_32         i;
        uint_32_ptr     ptr = (pointer)(&__vect_table);
        /* Initialize the hardware interrupt vector table
         * 0: Initial stack pointer
         * 1: Initial program counter
         */
        for (i = 16; i < PSP_MAXIMUM_INTERRUPT_VECTORS; i++) {
            ptr[i] = (uint_32)_int_kernel_isr;
        }
    }
#endif
}

when the ptr[i] = (uint_32)_int_kernel_isr; is executed

[danielecortella]

If i change the setting MQX_ROM_VECTORS  to 1 and add this code in __init_hardware during the initialization

 uint32_t *pdst;
  uint32_t *psrc;
  uint16_t i;
  // Then redirect the vector table to RAM by changing the SCB_VTOR like this:
  // Redirect the vector table to the new copy in RAM
  SCB_VTOR = (uint32_t) (0x1FFFE000);
  // Copy Application Stored Interrupt Vector table to RAM
  pdst = (uint32_t*) (0x1FFFE000);
  psrc=(uint32_t*) (0x8080);
  for (i = 0; i < 0xC0; i++, pdst++, psrc++) {
  (*pdst) = (*psrc);
  }
      // Check Copy
      pdst = (uint32_t*) (0x1FFFE000);
      psrc=(uint32_t*) (0x8080);
      for (i = 0; i < 0xC0; i++, pdst++, psrc++) {
          if ((*pdst) != (*psrc)) {
              // error
              while (1) {}
          }
      }

that copy the interrupt table from flash to ram the code is executed but only for a short time, in my function init

void Init_Device(void) {
  int error = 0;
  unsigned int firmware_version_SdCard = 0;
  unsigned int i = 0, bw = 0;
  /*
  * Parte di inizializzazione periferiche del dispositivo 
  * ADC, SPI, SDCard
  */
  //Cpu_SetClockConfiguration(0); //setto la cpu alla massima frequenza
  Ref_EN_SetVal();//abilito il MOS sul riferimento del ADC
  //resetto la SdCard agendo sulla alimentazione
  SDCard_ON_ClrVal();
  WAIT_Waitms(10);
  SDCard_ON_SetVal();

when is executed the wait function the cpu crash .... i think is a problem with the systemtimer interrupt of MQX. The crash is visible in the image

Thanks

[danielecortella]

Hi,

during the __init_hardware i copy the interrupt vector from flash to ram but when the MQX lite is executed with PEX_RTOS_START();  the SCB_VTOR change and return to a wrong value ... Why? Thanks

[Jorge_Gonzalez]

Hello Daniele Cortellazi:

I think your copy to RAM is not correct, you should increment both pointers by 4 with each iteration (pdst and psrc).

Apart from that I recommend you to instead give a try to the workaround described in the next post:

How to put vectors in ram with processor expert?

You have the same problem, although I did not try the solution with a bootloader-ready project.

Regards!

Jorge Gonzalez

[danielecortella]

Setting MQX_ROM_VECTORS to 0 in user_config.h the copy of the interrupt in RAM is not automatic?

Thanks

[Jorge_Gonzalez]

Hi Daniele:

In the case of MQX Lite, user_config.h is handled by Processor Expert and there is a bug in MQX Lite component that does not allow to install vectors in RAM automatically, you have to apply the workaround of the other thread.

I am sorry for the inconvenience.

Regards!

Jorge Gonzalez