XIAOHUI TAO / Mbed 2 deprecated hw2_protothread

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main.cpp@0:ee91220d7bea, 2010-11-30 (annotated)

Committer:
taoxh
Date:
Tue Nov 30 23:53:06 2010 +0000
Revision:
0:ee91220d7bea
HW2 PROTOTHREAD

Who changed what in which revision?

UserRevisionLine numberNew contents of line
taoxh 0:ee91220d7bea 1 /**
taoxh 0:ee91220d7bea 2 * This is hw2_3 that shows the implementation of
taoxh 0:ee91220d7bea 3 * protothreads. The program consists of three protothreads that wait
taoxh 0:ee91220d7bea 4 * for each other to toggle a variable.
taoxh 0:ee91220d7bea 5 */
taoxh 0:ee91220d7bea 6
taoxh 0:ee91220d7bea 7 /* We must always include pt.h in our protothreads code. */
taoxh 0:ee91220d7bea 8 #include "pt.h"
taoxh 0:ee91220d7bea 9 #include "mbed.h"
taoxh 0:ee91220d7bea 10 #include "pre_work.h"
taoxh 0:ee91220d7bea 11
taoxh 0:ee91220d7bea 12 /* Three flags that the three protothread functions use. */
taoxh 0:ee91220d7bea 13 static int protothread1_flag, protothread2_flag, protothread3_flag;
taoxh 0:ee91220d7bea 14
taoxh 0:ee91220d7bea 15 int count=0;
taoxh 0:ee91220d7bea 16 int pre_cir_pro=0; // in case of initial trigger fault
taoxh 0:ee91220d7bea 17 int judge=1;
taoxh 0:ee91220d7bea 18 int shown=0;
taoxh 0:ee91220d7bea 19 /**
taoxh 0:ee91220d7bea 20 * The first protothread function. It achieves the pc input part.
taoxh 0:ee91220d7bea 21 *
taoxh 0:ee91220d7bea 22 * The protothread function is driven by the main loop further down in
taoxh 0:ee91220d7bea 23 * the code.
taoxh 0:ee91220d7bea 24 */
taoxh 0:ee91220d7bea 25 static int
taoxh 0:ee91220d7bea 26 protothread1(struct pt *pt)
taoxh 0:ee91220d7bea 27 {
taoxh 0:ee91220d7bea 28 PT_BEGIN(pt);
taoxh 0:ee91220d7bea 29 /* We loop forever here. */
taoxh 0:ee91220d7bea 30 while(1) {
taoxh 0:ee91220d7bea 31 /* Wait until the other protothread has set its flag. */
taoxh 0:ee91220d7bea 32 PT_WAIT_UNTIL(pt, protothread2_flag != 0 || pc.readable());//wait until pc inputs
taoxh 0:ee91220d7bea 33 // printf("Protothread 1 running\n");
taoxh 0:ee91220d7bea 34 /* We then reset the other protothread's flag, and set our own
taoxh 0:ee91220d7bea 35 flag so that the other protothread can run. */
taoxh 0:ee91220d7bea 36 protothread2_flag = 0;
taoxh 0:ee91220d7bea 37 protothread1_flag = 1;
taoxh 0:ee91220d7bea 38 char temp;
taoxh 0:ee91220d7bea 39 if (pc.readable()) {
taoxh 0:ee91220d7bea 40 temp=pc.getc();
taoxh 0:ee91220d7bea 41 if (temp=='E'&& length!=0){pc.printf("Input ends");}
taoxh 0:ee91220d7bea 42 else if (temp=='E'&& length==0){pc.printf("Error. No 'S' before 'E'");}
taoxh 0:ee91220d7bea 43 else if (temp=='S'){pc.printf("It is a new start.");length=0;count=0;}
taoxh 0:ee91220d7bea 44 else if (temp=='1'){
taoxh 0:ee91220d7bea 45 str[length]='1';length++;}
taoxh 0:ee91220d7bea 46 else if (temp=='0'){
taoxh 0:ee91220d7bea 47 str[length]='0';length++;}
taoxh 0:ee91220d7bea 48 else if (temp==' '){}
taoxh 0:ee91220d7bea 49 else senderror2();
taoxh 0:ee91220d7bea 50 if (length>40) {pc.printf("The allocated space is too small.");}
taoxh 0:ee91220d7bea 51 for (int i=0;i<length; i++)
taoxh 0:ee91220d7bea 52 { pc.putc(str[i]);}
taoxh 0:ee91220d7bea 53 pc.printf("\n");
taoxh 0:ee91220d7bea 54
taoxh 0:ee91220d7bea 55 }
taoxh 0:ee91220d7bea 56 // PT_WAIT_UNTIL(pt, pc.readable());
taoxh 0:ee91220d7bea 57 // pc.printf("I am here. Start inputing.");
taoxh 0:ee91220d7bea 58 // pc.getc();
taoxh 0:ee91220d7bea 59 // length=gtchar();
taoxh 0:ee91220d7bea 60 /* And we loop. */
taoxh 0:ee91220d7bea 61 protothread3_flag=1;
taoxh 0:ee91220d7bea 62 }
taoxh 0:ee91220d7bea 63
taoxh 0:ee91220d7bea 64 /* All protothread functions must end with PT_END() which takes a
taoxh 0:ee91220d7bea 65 pointer to a struct pt. */
taoxh 0:ee91220d7bea 66 PT_END(pt);
taoxh 0:ee91220d7bea 67 }
taoxh 0:ee91220d7bea 68
taoxh 0:ee91220d7bea 69 /**
taoxh 0:ee91220d7bea 70 * The second protothread function. This is almost the same as the
taoxh 0:ee91220d7bea 71 * first one. This part helps with the sensor input.
taoxh 0:ee91220d7bea 72 */
taoxh 0:ee91220d7bea 73 static int
taoxh 0:ee91220d7bea 74 protothread2(struct pt *pt)
taoxh 0:ee91220d7bea 75 {
taoxh 0:ee91220d7bea 76 PT_BEGIN(pt);
taoxh 0:ee91220d7bea 77 while(1) {
taoxh 0:ee91220d7bea 78 /* Let the other protothread run. */
taoxh 0:ee91220d7bea 79 protothread2_flag = 1;
taoxh 0:ee91220d7bea 80 /* Wait until the other protothread has set its flag. */
taoxh 0:ee91220d7bea 81 PT_WAIT_UNTIL(pt, protothread1_flag != 0); //This part always usually has not trigger info
taoxh 0:ee91220d7bea 82 // printf("Protothread 2 running\n");
taoxh 0:ee91220d7bea 83 /* We then reset the other protothread's flag. */
taoxh 0:ee91220d7bea 84 protothread1_flag = 0;
taoxh 0:ee91220d7bea 85 if (touchSense1()&& !touchSense2()) { //T0 happens
taoxh 0:ee91220d7bea 86 myled1 = 1;
taoxh 0:ee91220d7bea 87 myled2=0;
taoxh 0:ee91220d7bea 88 pc.putc('a');
taoxh 0:ee91220d7bea 89 shown=0;
taoxh 0:ee91220d7bea 90 while(1) {if (!test1()){break;} if (touchSense2()&& touchSense1()) {break;}}
taoxh 0:ee91220d7bea 91 // if (str[count]=='0') {judge=0;}
taoxh 0:ee91220d7bea 92 // judge=1;
taoxh 0:ee91220d7bea 93 // pc.putc(str[count]);
taoxh 0:ee91220d7bea 94 if (count>=length){
taoxh 0:ee91220d7bea 95 for (int i=1;i<count;i++)
taoxh 0:ee91220d7bea 96 { str2[i-1]=str2[i];
taoxh 0:ee91220d7bea 97 pc.putc(str2[i-1]);
taoxh 0:ee91220d7bea 98 }
taoxh 0:ee91220d7bea 99 str2[count-1]='1';
taoxh 0:ee91220d7bea 100 pc.putc(str2[count-1]);}
taoxh 0:ee91220d7bea 101 else { str2[count]='1';count++;}
taoxh 0:ee91220d7bea 102 //process_char();
taoxh 0:ee91220d7bea 103 } else if (touchSense2()&& !touchSense1()) { //T1 happens
taoxh 0:ee91220d7bea 104 if (pre_cir_pro>30){
taoxh 0:ee91220d7bea 105 myled1 = 0;
taoxh 0:ee91220d7bea 106 myled2=1;
taoxh 0:ee91220d7bea 107 pc.putc('b');
taoxh 0:ee91220d7bea 108 shown=0;
taoxh 0:ee91220d7bea 109 while(1) {if (!test2()){break;} if (touchSense2()&& touchSense1()) {break;} }
taoxh 0:ee91220d7bea 110 // if (str[count]=='1') {judge=0;}
taoxh 0:ee91220d7bea 111 // judge=0;
taoxh 0:ee91220d7bea 112 // pc.putc(str[count]);
taoxh 0:ee91220d7bea 113 if (count>=length){
taoxh 0:ee91220d7bea 114 for (int i=1;i<count;i++)
taoxh 0:ee91220d7bea 115 { str2[i-1]=str2[i];
taoxh 0:ee91220d7bea 116 pc.putc(str2[i-1]);
taoxh 0:ee91220d7bea 117 }
taoxh 0:ee91220d7bea 118 str2[count-1]='0';
taoxh 0:ee91220d7bea 119 pc.putc(str2[count-1]);}
taoxh 0:ee91220d7bea 120 else { str2[count]='0';count++;}
taoxh 0:ee91220d7bea 121 }
taoxh 0:ee91220d7bea 122 } else if (touchSense2()&& touchSense1()) { //Touch error
taoxh 0:ee91220d7bea 123 myled1 = 1;
taoxh 0:ee91220d7bea 124 myled2=1;
taoxh 0:ee91220d7bea 125 senderror();
taoxh 0:ee91220d7bea 126 } else { //anything else
taoxh 0:ee91220d7bea 127 myled1=0;
taoxh 0:ee91220d7bea 128 myled2=0;
taoxh 0:ee91220d7bea 129 }
taoxh 0:ee91220d7bea 130 pre_cir_pro++;
taoxh 0:ee91220d7bea 131 /* And we loop. */
taoxh 0:ee91220d7bea 132 protothread3_flag=1;
taoxh 0:ee91220d7bea 133 }
taoxh 0:ee91220d7bea 134 PT_END(pt);
taoxh 0:ee91220d7bea 135 }
taoxh 0:ee91220d7bea 136
taoxh 0:ee91220d7bea 137 static int
taoxh 0:ee91220d7bea 138 protothread3(struct pt *pt)
taoxh 0:ee91220d7bea 139 {
taoxh 0:ee91220d7bea 140 /* A protothread function must begin with PT_BEGIN() which takes a
taoxh 0:ee91220d7bea 141 pointer to a struct pt. Match judging and output */
taoxh 0:ee91220d7bea 142 PT_BEGIN(pt);
taoxh 0:ee91220d7bea 143 /* We loop forever here. */
taoxh 0:ee91220d7bea 144 while(1) {
taoxh 0:ee91220d7bea 145 PT_WAIT_UNTIL(pt,count>=length &&count!=0 && protothread3_flag==1 );
taoxh 0:ee91220d7bea 146 // pc.printf("here");
taoxh 0:ee91220d7bea 147 for (int i=0;i<length;i++)
taoxh 0:ee91220d7bea 148 { if (str[i]!=str2[i]) {judge=0;} }
taoxh 0:ee91220d7bea 149 if (judge==1 && shown==0) {pc.printf("\nMATCH");shown=1;}
taoxh 0:ee91220d7bea 150 judge=1;
taoxh 0:ee91220d7bea 151 protothread3_flag=0;
taoxh 0:ee91220d7bea 152 // PT_WAIT_UNTIL(pt, pc.readable());
taoxh 0:ee91220d7bea 153 // pc.printf("I am here. Start inputing.");
taoxh 0:ee91220d7bea 154 // pc.getc();
taoxh 0:ee91220d7bea 155 // length=gtchar();
taoxh 0:ee91220d7bea 156 /* And we loop. */
taoxh 0:ee91220d7bea 157 }
taoxh 0:ee91220d7bea 158
taoxh 0:ee91220d7bea 159 /* All protothread functions must end with PT_END() which takes a
taoxh 0:ee91220d7bea 160 pointer to a struct pt. */
taoxh 0:ee91220d7bea 161 PT_END(pt);
taoxh 0:ee91220d7bea 162 }
taoxh 0:ee91220d7bea 163
taoxh 0:ee91220d7bea 164
taoxh 0:ee91220d7bea 165 /**
taoxh 0:ee91220d7bea 166 * Finally, we have the main loop. Here is where the protothreads are
taoxh 0:ee91220d7bea 167 * initialized and scheduled. Almost nothing in it.
taoxh 0:ee91220d7bea 168 */
taoxh 0:ee91220d7bea 169 static struct pt pt1,pt2,pt3;
taoxh 0:ee91220d7bea 170 int
taoxh 0:ee91220d7bea 171 main(void)
taoxh 0:ee91220d7bea 172 {
taoxh 0:ee91220d7bea 173 /* Initialize the protothread state variables with PT_INIT(). */
taoxh 0:ee91220d7bea 174 PT_INIT(&pt1);
taoxh 0:ee91220d7bea 175 PT_INIT(&pt2);
taoxh 0:ee91220d7bea 176 PT_INIT(&pt3);
taoxh 0:ee91220d7bea 177 /*
taoxh 0:ee91220d7bea 178 * Then we schedule the three protothreads by repeatedly calling their
taoxh 0:ee91220d7bea 179 * protothread functions and passing a pointer to the protothread
taoxh 0:ee91220d7bea 180 * state variables as arguments.
taoxh 0:ee91220d7bea 181 */while(1){ protothread2(&pt2);
taoxh 0:ee91220d7bea 182 protothread1(&pt1);
taoxh 0:ee91220d7bea 183 protothread3(&pt3);
taoxh 0:ee91220d7bea 184 }
taoxh 0:ee91220d7bea 185 }