模拟EEPROM出现的问题

只看该作者 · 2015-6-18 10:50

本帖最后由 adamdo001 于 2015-6-18 10:51 编辑

学习官方例程flexmem_demo，使用K20DX256VLL7处理器过程中，用IAR开发程序，遇到问题。

__ramfunc INT32U FlexEE_partition_flash(INT32U eeprom_size, INT32U dflash_size)
{
Test to make sure the device is not already partitioned. If it
   * is already partitioned, then return with no action performed.
   */
   if ((SIM_FCFG1 & SIM_FCFG1_DEPART(0xF)) != 0x00000F00)
   {
         return PARTED_FAIL;
   }

   /* Write the FCCOB registers */
   FTFL_FCCOB0 = FTFL_FCCOB0_CCOBn(0x80); // Selects the PGMPART command
   FTFL_FCCOB1 = 0x00;
   FTFL_FCCOB2 = 0x00;
   FTFL_FCCOB3 = 0x00;

   /* FCCOB4 is written with the code for the subsystem sizes (eeprom_size define) */
   FTFL_FCCOB4 = eeprom_size;

   /* FFCOB5 is written with the code for the Dflash size (dflash_size define) */
   FTFL_FCCOB5 = dflash_size;

   /* All required FCCOBx registers are written, so launch the command */
   FTFL_FSTAT = FTFL_FSTAT_CCIF_MASK;

   /* Wait for the command to complete */
   while(!(FTFL_FSTAT & FTFL_FSTAT_CCIF_MASK));
   return 1;
}

在上面的程序里，上电复位后，经常停在标红的那一行。
在IAR里看到程序一直等待在 while(!(FTFL_FSTAT & FTFL_FSTAT_CCIF_MASK));
在IAR用Jlink调试，单步运行，走过这一行，再向下就正常了。

FlexEE_partition_flash这个函数是不是要放在RAM里运行？

多次遇到上面的这个情况。到底是什么原因？怎样解决？