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標題: 請問code int nums[]={....};和int code nums[]={...}; 有區別嗎 [打印本頁]
作者: laopihappy123    時間: 2020-10-16 20:05
標題: 請問code int nums[]={....};和int code nums[]={...}; 有區別嗎
大家好，我查到 code的意思是固化在rom里 ，我想： 那么應該是不可寫了？ 豈不是const了
由此想到了標題這個問題

不知道順序的變化是否會影響代碼，這里的num應該是個常量指針，不可改。。。

作者: angmall    時間: 2020-10-16 22:18
code 順序的變化是不會影響代碼的

  1. code

  3. The code memory type may be used for constants and functions. This memory is accessed using 16-bit addresses and may be on-chip or external.

  5. For constants (ROM variables), code memory is limited to 64K. Objects are limited to 64K and may not cross a 64K boundary. Constant variables declared code are located in the CODE memory class.
  6. For program code (functions), code memory is limited to 64K. Program functions are stored in the CODE memory class by default. The code memory type specifier is not required.
  7. Declare code objects as follows:

  9. unsigned char code code_constant;

  11. unsigned int func (void)
  12. {
  13.    return (0);
  14. }

  16. ============================================
  17. The Cx51 Compiler conforms to the ANSI definition of const objects.

  19. Variables declared with the const type qualifier alone are stored in the memory area (data, idata, xdata, and so on) associated with their definition.

  21. Variables you want to locate in ROM must be declared with the code memory type. For example:
  22. code char test[] = "This is a text string";

復制代碼

作者: laopihappy123    時間: 2020-10-16 22:56
angmall 發表于 2020-10-16 22:18
code 順序的變化是不會影響代碼的

哇塞! 這個文檔看起來好像很厲害的樣子 請問在哪里可以看到?
作者: angmall    時間: 2020-10-16 23:44
laopihappy123 發表于 2020-10-16 22:56
哇塞! 這個文檔看起來好像很厲害的樣子 請問在哪里可以看到?

這里
https://www.keil.com/support/man/docs/c51/c51_le_code.htm
作者: laopihappy123    時間: 2020-10-17 00:08
angmall 發表于 2020-10-16 23:44
這里
https://www.keil.com/support/man/docs/c51/c51_le_code.htm

感恩大佬！



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