dsp281x_csmunlock.c

许继的2812开发全套驱动程序，很全很实用的.rar

/*------------------------------------------------------------------
   CsmUnlock

   Unlock the code security module (CSM)
 
   Parameters:
  
   Return Value:
 
            STATUS_SUCCESS         CSM is unlocked
            STATUS_FAIL_UNLOCK     CSM did not unlock
        
   Notes:
     
-----------------------------------------------------------------*/
#include "DSP281x_Device.h"     // DSP281x Headerfile Include File

#define STATUS_SUCCESS 0
#define STATUS_FAIL_UNLOCK 1
#define PRG_key0 0xFFFF
#define PRG_key1 0xFFFF
#define PRG_key2 0xFFFF
#define PRG_key3 0xFFFF
#define PRG_key4 0xFFFF
#define PRG_key5 0xFFFF
#define PRG_key6 0xFFFF
#define PRG_key7 0xFFFF
#define CSMSCR       (volatile Uint16*)0x00000AEF   // CSM status and control register 
#define KEY0         (volatile Uint16*)0x00000AE0   /* low word of the 128-bit key */
#define KEY1         (volatile Uint16*)0x00000AE1   /* next word in 128-bit key */
#define KEY2         (volatile Uint16*)0x00000AE2   /* next word in 128-bit key */ 
#define KEY3         (volatile Uint16*)0x00000AE3   /* next word in 128-bit key */
#define KEY4         (volatile Uint16*)0x00000AE4   /* next word in 128-bit key */
#define KEY5         (volatile Uint16*)0x00000AE5   /* next word in 128-bit key */
#define KEY6         (volatile Uint16*)0x00000AE6   /* next word in 128-bit key */
#define KEY7         (volatile Uint16*)0x00000AE7   /* high word of the 128-bit key */
#define PWL0         (volatile Uint16*)0x003F7FF8   /* Password 0 */
#define PWL1         (volatile Uint16*)0x003F7FF9   /* Password 1 */
#define PWL2         (volatile Uint16*)0x003F7FFA   /* Password 2 */
#define PWL3         (volatile Uint16*)0x003F7FFB   /* Password 3 */
#define PWL4         (volatile Uint16*)0x003F7FFC   /* Password 4 */
#define PWL5         (volatile Uint16*)0x003F7FFD   /* Password 5 */
#define PWL6         (volatile Uint16*)0x003F7FFE   /* Password 6 */
#define PWL7         (volatile Uint16*)0x003F7FFF   /* Password 7 */

Uint16 CsmUnlock()
{
    volatile Uint16 temp;

    // Load the key registers with the current password
    // These are defined in Example_Flash2812_CsmKeys.asm
    
    EALLOW;
    *KEY0 = PRG_key0;
    *KEY1 = PRG_key1;
    *KEY2 = PRG_key2;
    *KEY3 = PRG_key3;
    *KEY4 = PRG_key4;
    *KEY5 = PRG_key5;
    *KEY6 = PRG_key6;
    *KEY7 = PRG_key7;   
    EDIS;

    // Perform a dummy read of the password locations
    // if they match the key values, the CSM will unlock 
        
    temp = *PWL0;
    temp = *PWL1;
    temp = *PWL2;
    temp = *PWL3;
    temp = *PWL4;
    temp = *PWL5;
    temp = *PWL6;
    temp = *PWL7;
 
    // If the CSM unlocked, return succes, otherwise return
    // failure.
    if ( (*CSMSCR & 0x0001) == 0) return STATUS_SUCCESS;
    else return STATUS_FAIL_UNLOCK;
    
}
//===========================================================================
// No more.
//===========================================================================