W25X40的操作程序是不是这样？

onbluesun

W25X40的写使能的程序如下，单片机使用STC12C5A60S2，有SPI接口：

1. #include "reg51.h"
   
2. typedef unsigned char BYTE;
   
3. typedef unsigned int WORD;
   
4. typedef unsigned long DWORD;
   
5. 
   
6. sfr P1M1 = 0x91;
   
7. sfr P1M0 = 0x92;
   
8. 
   
9. sfr AUXR = 0x8e; //Auxiliary register
   
10. sfr SPSTAT = 0xcd; //SPI status register
    
11. #define SPIF 0x80 //SPSTAT.7
    
12. #define WCOL 0x40 //SPSTAT.6
    
13. sfr SPCTL = 0xce; //SPI control register
    
14. #define SSIG 0x80 //SPCTL.7
    
15. #define SPEN 0x40 //SPCTL.6
    
16. #define DORD 0x20 //SPCTL.5
    
17. #define MSTR 0x10 //SPCTL.4
    
18. #define CPOL 0x08 //SPCTL.3
    
19. #define CPHA 0x04 //SPCTL.2
    
20. #define SPDHH 0x00 //CPU_CLK/4
    
21. #define SPDH 0x01 //CPU_CLK/16
    
22. #define SPDL 0x02 //CPU_CLK/64
    
23. #define SPDLL 0x03 //CPU_CLK/128
    
24. sfr SPDAT = 0xcf; //SPI data register
    
25. sfr IE2 = 0xAF; //interrupt enable rgister 2
    
26. #define ESPI 0x02 //IE2.1
    
27. void InitSPI();
    
28. 
    
29. sbit cs = P1^0;
    
30. //sbit wp = P1^1;
    
31. //sbit hold = P1^2;
    
32. 
    
33. void main()
    
34. {
    
35. P1M1=0xff;
    
36. P1M0=0xff;
    
37. 
    
38. InitSPI(); //initial SPI
    
39. IE2 |= ESPI;
    
40. 
    
41. EA = 1;
    
42. 
    
43. cs=0;
    
44. SPDAT=0x06;
    
45. 
    
46. while (1);
    
47. }
    
48. 
    
49. void spi_isr( ) interrupt 9 using 1 //SPI interrupt routine 9 (004BH)
    
50. {
    
51. SPSTAT = SPIF | WCOL; //clear SPI status
    
52. cs=1;
    
53. }
    
54. ///////////////////////////////////////////////////////////
    
55. void InitSPI()
    
56. {
    
57. SPDAT = 0; //initial SPI data
    
58. SPSTAT = SPIF | WCOL; //clear SPI status
    
59. SPCTL = SPEN | MSTR; //master mode
    
60. }

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上面的程序对吗？单片机向W25X40发送0x06后，得到一个返回值0x00，之后我又读状态寄存器，发现返回值也是0x00，感觉程序肯定不对。下面是写使能的时序图：