mpu_ex3_systemPreInit.c

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//******************************************************************************
//  MSP430FR59x Demo - MPU Write protection violation in the device's boot process.
//  The MPU configuration code is put in the _system_pre_init() for CCS and
//  __low_level_init() for IAR.
//
//  Description: The MPU segment boundaries are defined by:
//  Border 1 = 0x6000 [MPUSEGB1 = 0x0600]
//  Border 2 = 0x8000 [MPUSEGB2 = 0x0800]
//  Segment 1 = 0x4400 - 0x5FFF
//  Segment 2 = 0x6000 - 0x7FFF
//  Segment 3 = 0x8000 - 0x13FFF
//  Segment 2 is write protected. Any write to an address in the segment 2 range
//  causes a PUC.
//
//  ACLK = n/a, MCLK = SMCLK = default DCO
//
//
//           MSP430FR5969
//         ---------------
//     /|\|               |
//      | |               |
//      --|RST            |
//        |               |
//
//******************************************************************************
 
#include "driverlib.h"
 
#if defined(__TI_COMPILER_VERSION__)
int _system_pre_init(void)
#elif defined(__IAR_SYSTEMS_ICC__)
int __low_level_init(void)
#elif defined(__GNUC__)
int __attribute__((naked, section(".crt_0000init"), used)) _system_pre_init(void)
#endif
{
    // Stop WDT
    WDT_A_hold(WDT_A_BASE);
 
    // Configure MPU
    MPU_initThreeSegmentsParam param = {0};
    param.seg1boundary = 0x0600;
    param.seg2boundary = 0x0800;
    param.seg1accmask = MPU_READ|MPU_WRITE|MPU_EXEC;
    param.seg2accmask = MPU_READ;
    param.seg3accmask = MPU_READ|MPU_WRITE|MPU_EXEC;
    MPU_initThreeSegments(MPU_BASE, &param);
  
    // Disable PUC on violation
    MPU_disablePUCOnViolation(MPU_BASE,MPU_SECOND_SEG);
 
    // Enable NMI event on violation
    MPU_enableNMIevent(MPU_BASE);
 
    // enable MPU operation
    MPU_start(MPU_BASE);
 
    return 1;
}
 
void main(void)
{
    
}