flash写入（一）

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//******************************************************************************
//  MSP430F552x 例程 - 单Byte Flash In-System Programming, 复制SegC到SegD
//
//  这段程序首先擦除段C的数据，然后写入递增的数据（value），在擦除段D数据，最后将C中的数据复制到D
// 段C初试地址为0x1880,段D初始地址为0x1800，
//  ACLK = REFO = 32kHz, MCLK = SMCLK = default DCO 1048576Hz
//
//                MSP430F552x
//            -----------------
//        /|\|              XIN|-
//         | |                 |
//         --|RST          XOUT|-
//           |                 |
//
//   Bhargavi Nisarga
//   Texas Instruments Inc.
//   April 2009
//   Built with CCSv4 and IAR Embedded Workbench Version: 4.21
//******************************************************************************

#include <msp430.h>

char value;                                 // 8-bit value to write to seg C

// Function prototypes
void write_SegC(char value);
void copy_C2D(void);

int main(void)
{
    
    
  WDTCTL = WDTPW+WDTHOLD;                   // 关闭看门狗
  value = 0;                                // 初始化 value

  while(1)
  {
    
    
    write_SegC(value++);                    // 向段C中写入递增值（0、1、2、3···）
    copy_C2D();                             // 复制段C的数据到段D中
    __no_operation();                       // Loop forever, SET BREAKPOINT HERE
  }
}

//------------------------------------------------------------------------------
// Input = value, holds value to write to Seg C
//------------------------------------------------------------------------------
void write_SegC(char value)
{
    
    
  unsigned int i;
  char * Flash_ptr;                         // 初始化Flash指针
  Flash_ptr = (char *) 0x1880;              // 地址为0x1880
  FCTL3 = FWKEY;                            // 清除Lock bit
  FCTL1 = FWKEY+ERASE;                      // 设置Erase bit
  *Flash_ptr = 0;                           // 因为flash只能从1写为0，不能从0写为1，所以每次写入前都需要擦除
  FCTL1 = FWKEY+WRT;                        // 设置WRT bit后才能写入

  for (i = 0; i < 128; i++)
  {
    
    
    *Flash_ptr++ = value;                   // 写入
  }
  FCTL1 = FWKEY;                            // 清除WRT bit
  FCTL3 = FWKEY+LOCK;                       // 设置LOCK bit
}

//------------------------------------------------------------------------------
// Copy Seg C to Seg D
//------------------------------------------------------------------------------
void copy_C2D(void)
{
    
    
  unsigned int i;
  char *Flash_ptrC;
  char *Flash_ptrD;

  Flash_ptrC = (char *) 0x1880;             // 初始化段 C 指针
  Flash_ptrD = (char *) 0x1800;             // 初始化段 D 指针

  __disable_interrupt();                    // 禁止中断
                                            // interrupt while erasing. Re-Enable
                                            // GIE if needed
  FCTL3 = FWKEY;                            // 清除 Lock bit
  FCTL1 = FWKEY+ERASE;                      // 设置Erase bit
  *Flash_ptrD = 0;                          // 擦除，理由同上
  FCTL1 = FWKEY+WRT;                        // 设置WRT bit后才能写入

  for (i = 0; i < 128; i++)
  {
    
    
    *Flash_ptrD++ = *Flash_ptrC++;          // 复制段C到段D
  }

  FCTL1 = FWKEY;                            // 清除WRT bit
  FCTL3 = FWKEY+LOCK;                       // 设置LOCK bit
}