MSP430(F149)学习笔记——红外接收

用MSP430（F149）做红外接收比发送更为简单，我采用的红外传感器是HS0038B，这个原件在接收到38K红外时输出低电平，否则输出高电平，因此，我们就可以从这点开始编写程序了，由于HS0038B的电路图很多，我这里就不贴出来了，下面是具体的代码：

1. #includemsp430x14x.h>
2. #include"delay.h"
4. staticunsignedshortaddr=0x00;
5. staticunsignedcharir_rx_buf[256];
6. staticunsignedcharir_rx_w_offset=0;
7. staticunsignedcharir_rx_r_offset=0;
9. voidir_tx_open(){
10. P2DIR|=BIT2|BIT3;//P2.2,P2.3输出
11. P2SEL|=BIT3;//P2.2:IOP2.3:TA0
12. P2SEL&=~BIT2;//
13. P2OUT&=~(BIT2|BIT3);
15. //38K->P2.3
16. CCR0=(int)(26.3*8+0.5);
17. CCTL1=OUTMOD_6;
18. CCR1=(int)(13.15*8+0.5);
20. TACTL=TASSEL_2+MC_1;
21. }
23. voidir_set_addr(unsignedcharaddr){
24. addr=(unsignedchar)(0xff&addr);
25. }
27. staticvoidir_start(){
28. P2OUT|=BIT2;
29. delay_us(9000);
31. P2OUT&=~BIT2;
32. delay_us(4500);
33. }
35. staticvoidir_next(){
36. P2OUT|=BIT2;
37. delay_us(9000);
39. P2OUT&=~BIT2;
40. delay_us(2250);
41. }
43. staticvoidir_send_byte(unsignedcharc){
44. unsignedchari;
46. for(i=0;i!=8;++i){
47. P2OUT|=BIT2;
48. delay_us(560);
50. P2OUT&=~BIT2;
51. if(c&0x01){
52. delay_us(1685);
53. }
54. else{
55. delay_us(565);
56. }
58. c>>=1;
59. }
60. }
62. staticvoidir_end(){
63. P2OUT|=BIT2;
64. delay_us(300);
65. P2OUT&=~BIT2;
66. }
68. voidir_put_char(unsignedcharc){
69. ir_start();
70. ir_send_byte(addr);
71. ir_send_byte(~addr);
72. ir_send_byte(c);
73. ir_send_byte(~c);
74. ir_end();
75. }
77. voidir_put_string(char*str){
78. if(*str!=)
79. ir_start();
80. else
81. return;
82. while(1){
83. ir_send_byte(addr);
84. ir_send_byte(~addr);
85. ir_send_byte(*str);
86. ir_send_byte(~(*str));
88. ++str;
90. if(*str!=){
91. ir_next();
92. }
93. else{
94. ir_end();
95. }
96. }
97. }
99. voidir_put_array(unsignedchar*array,unsignedintlength){
100. unsignedinti;
102. ir_start();
104. for(i=0;i!=length;++i){
105. ir_send_byte(addr);
106. ir_send_byte(~addr);
107. ir_send_byte(array[i]);
108. ir_send_byte(array[i]);
110. if(i
111. ir_next();
112. }
113. else{
114. ir_end();
115. }
116. }
117. }
119. voidir_tx_close(){
120. P2SEL&-~BIT3;
121. P2DIR|=BIT3;
122. P2OUT&=~BIT3;
123. TACTL=TACLR;
124. }
126. voidir_rx_open(){
127. P2SEL&=~BIT0;//I/O
128. P2DIR&=~BIT0;//Input
129. P2IES|=BIT0;//High->Low
130. P2IE|=BIT0;//Enableinterrupt
131. }
133. voidir_rx_close(){
134. P2IE&=~BIT0;//Disableinterrupt
135. }
137. unsignedcharir_get(){
138. while(ir_rx_r_offset==ir_rx_w_offset);
139. returnir_rx_buf[ir_rx_r_offset++];
140. }
142. #pragmavector=PORT2_VECTOR
143. __interruptvoidport2_handler(){
144. staticunsignedcharir_code[4];
145. unsignedchari,j;
146. unsignedshorttime;
148. if(P2IFG&BIT0){
149. P2IE&=~BIT0;
150. P2IFG&=~BIT0;
151. _EINT();
153. time_start(9500);
154. while(!time_out()&&!(P2IN&BIT0));
155. time=time_end();
156. if(!time_out()&&time>8500){
157. time_start(5000);
158. while(!time_out()&&(P2IN&BIT0));
159. time=time_end();
160. if(!time_out()&&time>4000){
161. for(i=0;i!=4;++i){
162. for(j=0;j!=8;++j){
163. while(!(P2IN&BIT0));//等待高电平
164. time_start(2000);//计时高电平
165. while(!time_out()&&(P2IN&BIT0));
166. time=time_end();
167. ir_code[i]>>=1;
168. if(!time_out()&&time>1500){
169. //uart_put(0x03);
170. ir_code[i]|=0x80;
171. }
172. else{
173. //uart_put(0x04);
174. ir_code[i]&=0x7f;
175. }
176. }
177. }
179. if(ir_code[0]==addr&&(0xff==ir_code[0]+ir_code[1])){
180. if(0xff==ir_code[2]+ir_code[3]){
181. ir_rx_buf[ir_rx_w_offset++]=ir_code[2];
182. }
183. }
184. }
185. }
187. P2IE|=BIT0;;
188. }
189. }

包含整理后的红外发送和接收，放在这里做个记录，有什么疑问欢迎留言讨论。