串口通信代码（总线时钟40M，9600）

仁者

1. #include <hidef.h> /* common defines and macros */
   
2. #include "derivative.h" /* derivative-specific definitions */
   
3. void SetBusCLK_40M(void)
   
4. {
   
5. CLKSEL=0X00; //disengage PLL to system
   
6. PLLCTL_PLLON=1; //turn on PLL
   
7. SYNR =0x04; // 0xc0 |
   
8. REFDV=0x01; //0x80 |
   
9. POSTDIV=0x00; //pllclock=2*osc*(1+SYNR)/(1+REFDV)=80MHz;
   
10. _asm(nop); //BUS CLOCK=40M
    
11. _asm(nop);
    
12. while(!(CRGFLG_LOCK==1)); //when pll is steady ,then use it;
    
13. CLKSEL_PLLSEL =1; //engage PLL to system;
    
14. }
    
15. 
    
16. void uart_init (void)
    
17. {
    
18. SCI0CR2 = 0x0c; //允许SCI0发送⑺?查询方式
    
19. SCI0BDH = 0x01; //注意：一定要先给高八位赋值 &&&我就错在这里了
    
20. SCI0BDL = 0x04; //再给低8位赋值
    
21. 
    
22. //SCI0CR1 = 0x00; //设置允许SCI,正常码输出,8位数据,无校验
    
23. }
    
24. void SCISend1(unsigned char o)
    
25. {
    
26. //判断ReStatusR的第SendTestBit位是否为1,是1可以发送
    
27. 
    
28. while (1)
    
29. if ((SCI0SR1 & (1<<7)) != 0)
    
30. {
    
31. SCI0DRL =o;
    
32. break;
    
33. }
    
34. }
    
35. 
    
36. 
    
37. 
    
38. void main(void) {
    
39. /* put your own code here */
    
40. 
    
41. SetBusCLK_40M();
    
42. uart_init();
    
43. EnableInterrupts;
    
44. SCISend1('Z');
    
45. 
    
46. for(;;) {
    
47. _FEED_COP(); /* feeds the dog */
    
48. } /* loop forever */
    
49. /* please make sure that you never leave main */
    
50. }

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