为何新塘N76E003 开启“9:common block subroutines”无法写Flash？

涵潇舒雅

Keil C51默认优化等级是“8：Reuse Common Entry Code”，再次优化等级下，能够正常操作Flash，为何将优化等级提高到“9:common block subroutines”，代码就无法写Flash？

注意到 write_DATAFLASH_BYTE 函数注释，这个咋破？

1. 
   
2. /*****************************************************************************************************************
   
3. write_DATAFLASH_BYTE :
   
4. user can copy all this subroutine into project, then call this function in main.
   
5. ******************************************************************************************************************/
   
6. void write_DATAFLASH_BYTE(UINT16 u16_addr, UINT8 u8_data)
   
7. {
   
8. 
   
9.     UINT8 looptmp = 0, u8_addrl_r;
   
10.     unsigned char code *cd_longaddr;
    
11.     unsigned char idata *xd_tmp;
    
12. 
    
13.     //Check page start address
    
14.     u8_addrl_r = u16_addr;
    
15. 
    
16.     if (u8_addrl_r < 0x80)
    
17.     {
    
18.         u8_addrl_r = 0;
    
19.     }
    
20.     else
    
21.     {
    
22.         u8_addrl_r = 0x80;
    
23.     }
    
24. 
    
25.     //Save APROM data to XRAM
    
26.     xd_tmp = 0x80;
    
27.     cd_longaddr = (u16_addr & 0xff00) + u8_addrl_r;
    
28. 
    
29.     while (xd_tmp != 0x100)
    
30.     {
    
31.         *xd_tmp = *cd_longaddr;
    
32.         looptmp++;
    
33.         xd_tmp++;
    
34.         cd_longaddr++;
    
35.     }
    
36. 
    
37.     // Modify customer data in XRAM
    
38.     u8_addrl_r = u16_addr;
    
39. 
    
40.     if (u8_addrl_r < 0x80)
    
41.     {
    
42.         xd_tmp = u8_addrl_r + 0x80;
    
43.     }
    
44.     else
    
45.     {
    
46.         xd_tmp = u8_addrl_r + 0;
    
47.     }
    
48. 
    
49.     *xd_tmp = u8_data;
    
50.     //Erase APROM DATAFLASH page
    
51.     IAPAL = u16_addr;
    
52.     IAPAH = u16_addr >> 8;
    
53.     IAPFD = 0xFF;
    
54.     set_IAPEN;
    
55.     set_APUEN;
    
56.     IAPCN = 0x22;
    
57.     set_IAPGO;
    
58.     //Save changed RAM data to APROM DATAFLASH
    
59.     u8_addrl_r = u16_addr;
    
60. 
    
61.     if (u8_addrl_r < 0x80)
    
62.     {
    
63.         u8_addrl_r = 0;
    
64.     }
    
65.     else
    
66.     {
    
67.         u8_addrl_r = 0x80;
    
68.     }
    
69. 
    
70.     xd_tmp = 0x80;
    
71.     IAPAL = u8_addrl_r;
    
72.     IAPAH = u16_addr >> 8;
    
73.     set_IAPEN;
    
74.     set_APUEN;
    
75.     IAPCN = 0x21;
    
76. 
    
77.     while (xd_tmp != 0xFF)
    
78.     {
    
79.         IAPFD = *xd_tmp;
    
80.         set_IAPGO;
    
81.         IAPAL++;
    
82.         xd_tmp++;
    
83.     }
    
84. 
    
85.     clr_APUEN;
    
86.     clr_IAPEN;
    
87. 
    
88. }

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