将ROM_4000修改为RAM步骤

qiangxiaochen

总共修改6个地方

1.prm文件，将

• ROM_4000  = READ_ONLY        DATA_NEAR   IBCC_NEAR   0x4000 TO 0x7FFF修改为
  

RAM_4000  =READ_WRITE       DATA_NEAR      0x4000TO 0x7FFF

  2) DEFAULT_RAM  INTO RAM修改为

     DEFAULT_RAM  INTO RAM,RAM_4000

2.standard settings——Assembler for HC12——Options——Code Generations——Memory Model,修改为Banked MemoryModel,

3.standard settings——Assembler for HC12——Options——Code Generations——Define mapping for memory space0x4000~0x7FFF,修改为Map RAM,

4.standard settings——Compiler for HC12——Options——Code Generations——Memory Model,修改为Banked MemoryModel,

5.standard settings——Compiler for HC12——Options——Code Generations——Define mapping for memory space0x4000~0x7FFF,修改为Map RAM,

6.standard settings——Compiler for HC12——Options——Language——Preprocessor definitions——，修改为__MAP_RAM__

7.上述的设置工作，都是准备工作，没有下述语句，上述的设置工作，都是白费，

====================================语句开始===========================================

#if(defined(__MAP_RAM__) || defined(__MAP_FLASH__) || defined(__MAP_EXTERNAL__))&& !defined(__DO_SET_MMCTL1__)

#define__DO_SET_MMCTL1__

#endif

#ifdefined(__DO_SET_MMCTL1__)

  /* Set the MMCTL1 byte. Please use forHCS12XE and change the bits according  */

  /* to your configuration.                                                     */

  /* Note: MMCTL1 is write once thereforeplease adapt this initialization here. */

  /* This has to be done prior to the call toInit.                              */

#define _MMCTL1_ADR(0x00000013)

#define_MMCTL1_BIT_TGMRAMON (1<<7)  /* EEETag RAM and FTM SCRATCH RAM visible in the memory map */

#define_MMCTL1_BIT_EEEIFRON (1<<5)  /* EEEIFR visible in the memory map                         */

#define_MMCTL1_BIT_PGMIFRON (1<<4)  /*Program IFR visible in the memory map                     */

#define_MMCTL1_BIT_RAMHM    (1<<3)  /* RAM only in the higher half of the memorymap             */

#define_MMCTL1_BIT_EROMON   (1<<2)  /* Enables emulated Flash or ROM memory inthe memory map    */

#define_MMCTL1_BIT_ROMHM    (1<<1)  /* FLASH or ROM only in higher Half of MemoryMap            */

#define_MMCTL1_BIT_ROMON    (1<<0)  /* Enable FLASH or ROM in the memory map                     */

#define_MMCTL1_SET(value)   ((*(volatileunsigned char*)_MMCTL1_ADR)= (value))

#ifdefined(__MAP_FLASH__)

  _MMCTL1_SET(_MMCTL1_BIT_ROMON |_MMCTL1_BIT_EROMON);

#elifdefined(__MAP_EXTERNAL__)

  _MMCTL1_SET(_MMCTL1_BIT_ROMON |_MMCTL1_BIT_EROMON | _MMCTL1_BIT_ROMHM);

#else /* RAM */

  _MMCTL1_SET(_MMCTL1_BIT_ROMON |_MMCTL1_BIT_EROMON | _MMCTL1_BIT_RAMHM | _MMCTL1_BIT_ROMHM);

#endif   

#endif

====================================语句结束===========================================

上面的语句，一般都是在新建工程的时候，编译器自动在start12.c文件里生成的，不用手动修改。

主要是通过读取是否预定义了__MAP_RAM__或(__MAP_FLASH__或__MAP_EXTERNAL__

并根据预定义项对MMCTL1寄存器进行操作，寄存器按预定义设置好后，0x4000~0x7FFF地址即可按设置进行分配。

阅读全文

jiang887786

貌似很牛逼啊，你验证了吗？具体哪个芯片？

qiangxiaochen

jiang887786 发表于 2017-9-13 16:55
貌似很牛逼啊，你验证了吗？具体哪个芯片？

验证了，是XEP100

qiangxiaochen

jiang887786 发表于 2017-9-13 16:55
貌似很牛逼啊，你验证了吗？具体哪个芯片？

验证了，是XEP100

qiangxiaochen

jiang887786 发表于 2017-9-13 16:55
貌似很牛逼啊，你验证了吗？具体哪个芯片？

验证了，是XEP100

qiangxiaochen

jiang887786 发表于 2017-9-13 16:55
貌似很牛逼啊，你验证了吗？具体哪个芯片？

验证了，是XEP100

qiangxiaochen

jiang887786 发表于 2017-9-13 16:55
貌似很牛逼啊，你验证了吗？具体哪个芯片？

验证了，是XEP100

qiangxiaochen

尴尬了，网页出了问题，回复了这么多次