(CC2540) I need skeleton code without BLE Stack.

I do not understand what you want.

I mean I want to use CC2540 only for computing unit. (Sleep Timer, ADC, UART only)

Thus the code that is provided from btool(including OSAL) is too huge package for me.

What I want is only function code.

Sorry for my bad English.

Anyway I'm not English, the problem was not about the language but the question's content ;) You do not have to verify the question till it is answered ;)

The core of the CC2540 is a 8051 processor. Perhaps you could arrange a main() of a sample program of the TI stack to not act as a BLE device but I really do not get the point of this approach. What are you trying to do? If you need a plattform with a microcontroller, you can try, for example, Arduino or Teensy. They are much easy to manage and are not bonded to IAR or BLE and the GPIO pins are easier to access :)

For example, a working base could look like this one:

#include "ioCC2540.h"
#include "hal_adc.h"
#include "hal_adc.c"

volatile uint16 result [200];


int main( void )
{

  volatile int i = 0;

  CLKCONCMD  = (0 << 6);  // XOSC
  CLKCONCMD |= (0x0<<5);  // Tick 32 MHz
  CLKCONCMD |= (0x0<<2);  // CLK-Speed 32 MHz    

  HalAdcInit(); // Initialize the ADC
 
  HalAdcSetReference((uint8)HAL_ADC_REF_AVDD); // Reference is taken from AVDD-Pin
 
  while(1)
  {
     result[i++] = HalAdcRead((uint8)0, (uint8)HAL_ADC_RESOLUTION_14);
     
     if(i == 199)
       i = 0;
  }
 
 return 0;
}

This piece of code fills an array with adc-samples of channel 0 in a loop, again and again.

I've tested code examples with only timer functionality. Any BLE-related thing was there.

As long as you deal with the power management issue, do whatever you want as in a 8051.