Cortex-M3 (NXP LPC1788)之UART用法

1. )(0x40098000))
2. #definerU2RBR(*(volatileunsigned*)(0x40098000))
3. #definerU2FCR(*(volatileunsigned*)(0x40098008))
4. #definerU2IIR(*(volatileunsigned*)(0x40098008))
5. #definerU2LSR(*(volatileunsigned*)(0x40098014))
6. #definerU2IER(*(volatileunsigned*)(0x40098004))
7. #definerU2ACR(*(volatileunsigned*)(0x40098020))
9. voidUART2_IRQHandler()
10. {
11. unsignedintintId;
12. chartmp_char;
14. intId=rU2IIR&0xf;
15. rU2THR=intId;
17. if(intId==0xc||intId==0x4)//RDA或者CTI中断
18. {
19. rU2LCR&=~(0x1<7);//DLAB=0
20. tmp_char=rU2RBR&0xff;
21. rU2THR=tmp_char;
22. }
23. intId=rU2IIR&0xf;
24. rU2THR=intId;
27. if(tmp_char==0xa5)
28. rFIO1PIN|=(1<18);
29. elseif(tmp_char==0x5a)
30. rFIO1PIN&=~(1<18);
31. }
33. voidSystemInit()
34. {
35. rSCS&=~(0x1<4);//频率12M
36. rSCS|=(0x1<5);//使能主振荡器
37. while(0==(rSCS&(0x1<6)));//等待主振荡器稳定
39. rCLKSRCSEL=0x1;
41. rPLL0CFG=0x9;//配置CCLK=120M
42. rPLL0CON=0x01;
43. rPLL0FEED=0xAA;
44. rPLL0FEED=0x55;
45. while(0==(rPLL0STAT&(0x1<10)));
47. rCCLKSEL=(0x1|(0x1<8));
48. rPCLKSEL=0x2;//配置PCLK=60M
49. rCLKOUTCFG=0x0|(0xb<4)|(0x1<8);
50. }
52. voidInit_Uart2()
53. {
54. rPCONP|=0x1<24;//使能UART2功率控制
56. rIOCON_P0_10=(rIOCON_P0_10&(~0x7))|0x1;//P0.10P0.11做UART2的发送和接收管脚
57. rIOCON_P0_11=(rIOCON_P0_11&(~0x7))|0x1;
59. rU2LCR|=0x1<7;//DLAB=1
60. rU2FDR=1|2<4;//波特率设置115200
61. rU2DLM=0;
62. rU2DLL=22;
63. rU2LCR&=~(0x1<7);//DLAB=0
64. rU2LCR|=0x3;//8位数据位，无校验，1个停止位
66. rU2TER|=0x1<7;//使能串口2的发送
68. rU2IER|=0x1;//使能串口2的接收中断
69. rU2FCR|=0x1;//复位FIFO,设置接收1个字符触发中断
70. rU2FCR|=0x1<1|0x1<2;
71. rISER0|=0x1<7;//使能串口2中断
73. }
75. voidUart2SendC(charc)
76. {
77. rU2THR=c&0xff;
78. while(!(rU2LSR&(0x1<5)));//等待rU2THR中的数据发送完成，防止数据溢出
79. }
81. voidUart2SendS(char*s)
82. {
83. while(*s)
84. {
85. Uart2SendC(*s);
86. s++;
87. }
88. }
90. intmain(void)
91. {
92. charstr[]={"\n\r1,DisplaytheU2IIR[3:0]+Data+U2IIR[3:0]\n\r2,Send0x5a--->TurnontheLED\n\r3,Send0xa5--->TurnofftheLED\n\r"};
93. rFIO1DIR|=(1<18);//GPIO1.18->OUTPUT
94. Init_Uart2();
95. Uart2SendS(str);
96. while(1);
97. }

运行结果如下图所示