AURIX™ Forum Discussions

[User16898]

User manual says to switch code execution from Flash to RAM during entering the standby mode page 506).

[HTML]CPU code execution is switched from Flash to PSPR RAM. Flash modules are
deactivated via FCON register.[/HTML]

There are no information about PSPR RAM register or how to switch this execution.
How can i do it ?

I work on Tc222L

[cwunder]

There are no information about PSPR RAM register or how to switch this execution.
How can i do it ?

The Program Scratch-Pad RAM (PSPR) is tightly coupled RAM located in the PMI with its own memory space. To execute from PSPR you would do like any other microcontroller to exectue from RAM. Generally you create an entery or section that has a storage address in (Flash) and execute address (RSM) and the copy table initialization moves it from Flash to RAM on startup. In your program you would call it like any other function.

For the Hightec toolchain you could do something like this:

__attribute__((asection(".cpu0_psram", "a=4", "f=xwc0")))
void TurnOffFlashEnterStandbyMode(void) {
  unlock_wdtcon(0);
  FLASH0_FCON.B.SLEEP = true;
  lock_wdtcon(0);


  while(false == FLASH0_FSR.B.SLM) {
    ; /*wait for flash to turn off */
      /*TODO: add timeout if this fails */
  }
...

[User16898]

thanks for Quick response.
unfortunetly
__attribute__((asection(".cpu0_psram", "a=4", "f=xwc0")))
is not recugnized by TASKING toolchain.

[cwunder]

For the Tasking toolchain you could do something like:

Where you need to add a section to the lsl file:

        
section_layout :vtc:linear     
{ 
  group pspr0 ( run_addr = mem:pspr0, copy ) 
  {
     select "*.myRamCode"; 
  }
}

Then in your code

volatile int cnt;

__noinline void myRamCode( void )
{
    cnt++;
}

[User16898]

after i placed suggested code I got following compiler error from .sls file :

syntax error: Could not find memory pspr0 for memory reference for a run-time or load-time address range of a group

[User16898]

Ok I found solution:

section_layout :tc0:linear
{
group STANDBY_MODE_RAM_FUNCTIONS(ordered, run_addr=mem : mpe : pspr0,copy)
{
select".text.ifx_standby_mode_psram.ifx_enter_standby_mode_psram_sequence";

select".text.IfxScuWdt.IfxScuWdt_clearSafetyEndinit";
select".text.IfxScuWdt.IfxScuWdt_setSafetyEndinit";

select".text.IfxScuWdt.IfxScuWdt_setCpuEndinit";
select".text.IfxScuWdt.IfxScuWdt_clearCpuEndinit";

}
}