iar in sram allow code to run in the

Environment: iar 8.40.1 MCU: mk64

1. Keyword __ramfunc

        iar can use keyword __ramfunc will function in ram, the function call with __ramfunc without __ramfunc function will be alert and cpu execution will be slower. __ramfunc address can not be specified.

 

  

        

        ox1fff0015 is in sram

2. Modify icf file

       1. Add automatic copy

initialize by copy { readwrite, section RAMCODE};

       2. The section RAMCODE put the ram

place in DATA_region                        {section RAMCODE};

       3. Add the test code

       

//方式1
 void testfun(void) @"RAMCODE"
{
  uint8_t a=3, b=4, c;
  c=a+b; 
  PRINTF("\r\n c is value is %d\r\n", c);
}
//方式2
#pragma location = "RAMCODE" 
void testfun(void) //@"RAMCODE"
{
  uint8_t a=3, b=4, c;
  c=a+b; 
  PRINTF("\r\n c is value is %d\r\n", c);
}
//方式3 该方法可以同时将多个函数放到 RAMCODE中
#pragma default_function_attributes = @"RAMCODE" 
void testfun1(void) //@"RAMCODE"
{
  uint8_t a=3, b=4, c;
  c=a+b; 
  PRINTF("\r\n c is value is %d\r\n", c);
}

void testfun2(void) //@"RAMCODE"
{
  uint8_t a=3, b=4, c;
  c=a+b; 
  PRINTF("\r\n c is value is %d\r\n", c);
}
    .
    .
    .
#pragma default_function_attributes =