Arduino IDE + mbed OS + M7 + M4

[deppenkaiser]

Hello,

i'am using a GIGA R1 WIFI board and i try to run a very simple app which only shows, that both cpu's are running.

I got this on VS Code with PlatformIO, but i can't get it on Arduino IDE.

Can you give me please the fundamental hint, how i can start both cpu's with mbed-OS?

thx, Michael

[schnoberts1]

In my app which has M7 and M4 constituents the M7 is started automatically and I don't think it can be simply disabled.

See https://docs.arduino.cc/tutorials/giga-r1-wifi/giga-dual-core/

Arduino examples use the RPC library to boot the M4 (see above). I don't that for a variety of reasons so I copied the relevant code.

I start the M4 processor thus:

[[maybe_unused]] static void cm4_kick()
{
  // If CM4 is already booted, disable auto-boot and reset.
  FLASH_OBProgramInitTypeDef OBInit;

  OBInit.Banks = FLASH_BANK_1;
  HAL_FLASHEx_OBGetConfig( &OBInit );
  if ( OBInit.USERConfig & FLASH_OPTSR_BCM4 ) {
    OBInit.OptionType = OPTIONBYTE_USER;
    OBInit.USERType = OB_USER_BCM4;
    OBInit.USERConfig = 0;
    HAL_FLASH_OB_Unlock();
    HAL_FLASH_Unlock();
    HAL_FLASHEx_OBProgram( &OBInit );
    HAL_FLASH_OB_Launch();
    HAL_FLASH_OB_Lock();
    HAL_FLASH_Lock();
    NVIC_SystemReset();
    return;
  }

  // from bootM4() implementation supplied with Arduino code
  // Classic boot, just set the address and we are ready to go
  LL_SYSCFG_SetCM4BootAddress0( CM4_BINARY_START >> 16 );
  LL_RCC_ForceCM4Boot();
}

and I call cm4_kick() when I want to start the M4 processor.

Advice wise, the best way to approach this stuiff is to look at the examples and if you need more, look at the library implementations. You get a lot of info that way.