ARM7串口编程要点

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1. #include "config.h"
2. void DelayNS(uint32 dly)
3. {
4. uint32 i;
5. for(; dly>0; dly--)
6. {
7. for(i=0; i<5000; i++);
8. }
9. }
10. void UART0_Init(uint32 bps)
11. {
12. uint16 Fdiv;
13. PINSEL0 = 0x00000005; //设置串口引脚
14. U0LCR = 0x83; //置为除数锁存位，进行配置
15. Fdiv = (Fpclk >> 4) / bps; // 设置波特率
16. U0DLM = Fdiv >> 8;
17. U0DLL = Fdiv & 0xff;
18. U0LCR = 0x03; //清除除数锁存位，并设置工作模式
19. }
20. uint8 UART0_RcvByte(void)
21. {
22. uint8 rcv_data ;
23. while((U0LSR&0X01)==0); //等待数据到达
24. rcv_data = U0RBR; //从U0RBR中读出接收到的数据
25. return rcv_data; //返回接收到的数据
26. }
27. void UART0_SendByte(uint8 data)
28. {
29. U0THR = data;
30. while(0 == (U0LSR & 0x40));
31. }
32. void UART0_RecBuf (uint8 *buffer)
33. {
34. uint8 *pbuffer;
35. uint8 i;
36. for(pbuffer = buffer, i = 0;i < 8; i++)
37. {
38. *(pbuffer++) = UART0_RcvByte();
39. }
40. }
41. void UART0_SendBuf(uint8 *buffer)
42. {
43. uint8 *pbuffer;
44. uint8 i;
45. for(pbuffer = buffer,i=0;i < 8; i++)
46. UART0_SendByte(*(pbuffer++));
47. }
48. int main (void)
49. {
50. uint8 recver_buffer[8]; //定义接收帧缓冲区
51. uint8 send_buffer[8] ={0x20,0x21,0x22,0x23,0x24,0x25,0x26,0x27}; //定义发送帧缓冲区
52. UART0_Init(115200);
53. while(1)
54. {
55. UART0_RecBuf(recver_buffer);
56. DelayNS(10);
57. if(0x10 ==recver_buffer[0] && 0x11 == recver_buffer[1])
58. UART0_SendBuf(recver_buffer);
59. else
60. UART0_SendBuf(send_buffer);
61. }
62. return 0;
63. }