TeamA / Mbed 2 deprecated USBSerial_StateMachine

Finite State Machine move between STATE virtual com port USB connect to PC while UART connect to modem

Dependencies:   USBDevice mbed

Fork of USBSerial_HelloWorld by Samuel Mokrani

main.cpp@10:a358762e1188, 2015-11-22 (annotated)

Committer:
oxtek
Date:
Sun Nov 22 09:44:43 2015 +0000
Revision:
10:a358762e1188
Parent:
9:d88699a0905a 
usb as virtual com port connect to PC and UART connect to modem

Who changed what in which revision?

UserRevisionLine numberNew contents of line
samux 7:5e693654d5b4 1 #include "mbed.h"
samux 7:5e693654d5b4 2 #include "USBSerial.h"
oxtek 10:a358762e1188 3 #define MAX_SIZE 16
oxtek 10:a358762e1188 4 #include <ctype.h>
oxtek 10:a358762e1188 5
samux 7:5e693654d5b4 6 //Virtual serial port over USB
oxtek 10:a358762e1188 7 USBSerial pc;
oxtek 10:a358762e1188 8 DigitalOut WDO(P0_20);
oxtek 10:a358762e1188 9 DigitalOut LED(P0_7);
oxtek 10:a358762e1188 10
oxtek 10:a358762e1188 11
oxtek 10:a358762e1188 12
oxtek 10:a358762e1188 13 Serial device(P0_19, P0_18); // tx, rx of RS232 pins
oxtek 10:a358762e1188 14 Timeout flipper;
oxtek 10:a358762e1188 15 char buf[MAX_SIZE];
oxtek 10:a358762e1188 16 char data[MAX_SIZE];
oxtek 10:a358762e1188 17 unsigned int i,j;
oxtek 10:a358762e1188 18 bool begin_msg=false;
oxtek 10:a358762e1188 19
oxtek 10:a358762e1188 20 Ticker t1;
oxtek 10:a358762e1188 21
oxtek 10:a358762e1188 22 // ******************************************************
oxtek 10:a358762e1188 23 // Finite State Machine Declare variable
oxtek 10:a358762e1188 24 // ******************************************************
oxtek 10:a358762e1188 25
oxtek 10:a358762e1188 26
oxtek 10:a358762e1188 27 /* Various states */
oxtek 10:a358762e1188 28 typedef enum tState {
oxtek 10:a358762e1188 29 STATE_A,
oxtek 10:a358762e1188 30 STATE_B,
oxtek 10:a358762e1188 31 STATE_C
oxtek 10:a358762e1188 32 } tState;
oxtek 10:a358762e1188 33
oxtek 10:a358762e1188 34 /* Variables */
oxtek 10:a358762e1188 35 tState state; /* Current state */
oxtek 10:a358762e1188 36 volatile unsigned char trigger; /* Bit set to indicate which button triggers */
oxtek 10:a358762e1188 37
oxtek 10:a358762e1188 38
oxtek 10:a358762e1188 39
oxtek 10:a358762e1188 40 /* task to be executed during each state transition */
oxtek 10:a358762e1188 41 void do_task(int n)
oxtek 10:a358762e1188 42 {
oxtek 10:a358762e1188 43 pc.printf("Task: %d \r\n", n);
oxtek 10:a358762e1188 44 wait(0.5);
oxtek 10:a358762e1188 45 trigger = 0;
oxtek 10:a358762e1188 46 pc.printf("Task %d done ... trigger=%d\r\n\r\n", n, trigger);
oxtek 10:a358762e1188 47
oxtek 10:a358762e1188 48 }
oxtek 10:a358762e1188 49
oxtek 10:a358762e1188 50 void sleep(void)
oxtek 10:a358762e1188 51 {
oxtek 10:a358762e1188 52 __WFI(); /* Power-saving sleeping mode */
oxtek 10:a358762e1188 53 }
oxtek 10:a358762e1188 54
oxtek 10:a358762e1188 55 // ***************************************************
oxtek 10:a358762e1188 56 // End of Finite State Machine declare variable
oxtek 10:a358762e1188 57 // ***************************************************
oxtek 10:a358762e1188 58
oxtek 10:a358762e1188 59
oxtek 10:a358762e1188 60 void determine_event(){
oxtek 10:a358762e1188 61 if ( strstr(data, "OK") != NULL ){
oxtek 10:a358762e1188 62 trigger = 0x02;
oxtek 10:a358762e1188 63 }
oxtek 10:a358762e1188 64 else if ( strstr(data, "ERROR") != NULL){
oxtek 10:a358762e1188 65 trigger = 0x04;
oxtek 10:a358762e1188 66 }
oxtek 10:a358762e1188 67 else{
oxtek 10:a358762e1188 68 trigger = 0x08;
oxtek 10:a358762e1188 69 }
oxtek 10:a358762e1188 70
oxtek 10:a358762e1188 71 }
oxtek 10:a358762e1188 72
oxtek 10:a358762e1188 73
oxtek 10:a358762e1188 74
oxtek 10:a358762e1188 75 // process to run after timeout in receiving char from serial device ( device.getc() )
oxtek 10:a358762e1188 76 void printout()
oxtek 10:a358762e1188 77 {
oxtek 10:a358762e1188 78 //for ( j=0; j<MAX_SIZE; j++) { // Put the character received into the computer.
oxtek 10:a358762e1188 79 // pc.putc(buf[j]);
oxtek 10:a358762e1188 80 // data[j] = buf[j];
oxtek 10:a358762e1188 81 // buf[j] = 0;
oxtek 10:a358762e1188 82 //}
oxtek 10:a358762e1188 83
oxtek 10:a358762e1188 84 memcpy(data, buf, MAX_SIZE);
oxtek 10:a358762e1188 85 memset(buf, 0, MAX_SIZE*sizeof(unsigned char) );
oxtek 10:a358762e1188 86 i = 0; //reset index
oxtek 10:a358762e1188 87 pc.printf(" data=%s<--\r\n", data);
oxtek 10:a358762e1188 88
oxtek 10:a358762e1188 89 determine_event();
oxtek 10:a358762e1188 90 }
oxtek 10:a358762e1188 91 void time_out()
oxtek 10:a358762e1188 92 {
oxtek 10:a358762e1188 93 printout();
oxtek 10:a358762e1188 94 //pc.printf("time out\n");
oxtek 10:a358762e1188 95 flipper.detach(); //reset timer
oxtek 10:a358762e1188 96 }
oxtek 10:a358762e1188 97
oxtek 10:a358762e1188 98 // char receive within window size (MAX_SIZE) or within window time (start_timer) otherwise discard
oxtek 10:a358762e1188 99 void check_frame()
oxtek 10:a358762e1188 100 {
oxtek 10:a358762e1188 101 //pc.printf(" i=%d \n",i);
oxtek 10:a358762e1188 102 if ( i == 0 ) { // if the 1st char receive
oxtek 10:a358762e1188 103 flipper.attach(&time_out, 3 ); //start_timer
oxtek 10:a358762e1188 104 pc.printf("data in UART start timer ... ");
oxtek 10:a358762e1188 105 }
oxtek 10:a358762e1188 106 if ( i >= MAX_SIZE ) { // char i receive exceed window size
oxtek 10:a358762e1188 107 printout();
oxtek 10:a358762e1188 108 } else { // char i still in window size
oxtek 10:a358762e1188 109 i++; // continue count
samux 7:5e693654d5b4 110 }
oxtek 10:a358762e1188 111
oxtek 10:a358762e1188 112 }
oxtek 10:a358762e1188 113
oxtek 10:a358762e1188 114 void rec() // Here's my serial interrupt routine.
oxtek 10:a358762e1188 115 {
oxtek 10:a358762e1188 116 if ( device.readable() ) {
oxtek 10:a358762e1188 117 trigger = 0;
oxtek 10:a358762e1188 118 //pc.printf("device.readable() there is some input in i=%d\r\n",i);
oxtek 10:a358762e1188 119 buf[i] = device.getc();
oxtek 10:a358762e1188 120 check_frame();
oxtek 10:a358762e1188 121 } else {
oxtek 10:a358762e1188 122 pc.printf(" device.readable() is not ready \n");
oxtek 10:a358762e1188 123 }
oxtek 10:a358762e1188 124 } // interrupt is done.
oxtek 10:a358762e1188 125
oxtek 10:a358762e1188 126 void blink()
oxtek 10:a358762e1188 127 {
oxtek 10:a358762e1188 128 LED = !LED;
oxtek 10:a358762e1188 129 WDO = !WDO;
oxtek 10:a358762e1188 130 }
oxtek 10:a358762e1188 131
oxtek 10:a358762e1188 132
oxtek 10:a358762e1188 133 int main(void)
oxtek 10:a358762e1188 134 {
oxtek 10:a358762e1188 135
oxtek 10:a358762e1188 136 device.baud(115200);
oxtek 10:a358762e1188 137
oxtek 10:a358762e1188 138 wait(1);
oxtek 10:a358762e1188 139 device.attach(&rec);
oxtek 10:a358762e1188 140 wait(3);
oxtek 10:a358762e1188 141 pc.printf("start at PC usb \r\n");
oxtek 10:a358762e1188 142 device.printf("start at P0_19,P0_18 \r\n");
oxtek 10:a358762e1188 143 i = 0;
oxtek 10:a358762e1188 144 t1.attach(&blink, 3.0);
oxtek 10:a358762e1188 145
oxtek 10:a358762e1188 146 /* initial the state machine */
oxtek 10:a358762e1188 147 state = STATE_A;
oxtek 10:a358762e1188 148 do_task(STATE_A);
oxtek 10:a358762e1188 149
oxtek 10:a358762e1188 150 while(1) {
oxtek 10:a358762e1188 151 /*
oxtek 10:a358762e1188 152 if(device.readable()) {
oxtek 10:a358762e1188 153 pc.putc(device.getc());
oxtek 10:a358762e1188 154 }
oxtek 10:a358762e1188 155 */
oxtek 10:a358762e1188 156
oxtek 10:a358762e1188 157 if(pc.readable()) {
oxtek 10:a358762e1188 158 //trigger = 1;
oxtek 10:a358762e1188 159 device.putc(pc.getc());
oxtek 10:a358762e1188 160 }
oxtek 10:a358762e1188 161
oxtek 10:a358762e1188 162 /* While I am not triggered, sleep */
oxtek 10:a358762e1188 163 //while (!trigger) {
oxtek 10:a358762e1188 164 // sleep();
oxtek 10:a358762e1188 165 //}
oxtek 10:a358762e1188 166 /* I am awake now. Check which button has triggered*/
oxtek 10:a358762e1188 167 switch (state) {
oxtek 10:a358762e1188 168 //////////////////////////////////////////////////////////////////
oxtek 10:a358762e1188 169 case STATE_A: ///////////////////////////////////////////////////
oxtek 10:a358762e1188 170 //////////////////////////////////////////////////////////////////
oxtek 10:a358762e1188 171 if (trigger & 0x02) { /* Button 1 down */
oxtek 10:a358762e1188 172 pc.printf("STATE_A ");
oxtek 10:a358762e1188 173 do_task(1);
oxtek 10:a358762e1188 174
oxtek 10:a358762e1188 175 pc.printf("will enter STATE_B \r\n");
oxtek 10:a358762e1188 176 state = STATE_B; /* Transit to STATE_B */
oxtek 10:a358762e1188 177 }
oxtek 10:a358762e1188 178 // trigger has to be set before state
oxtek 10:a358762e1188 179 //trigger = 0; /* Ignore other triggers in this state */
oxtek 10:a358762e1188 180
oxtek 10:a358762e1188 181 break;
oxtek 10:a358762e1188 182
oxtek 10:a358762e1188 183 //////////////////////////////////////////////////////////////////
oxtek 10:a358762e1188 184 case STATE_B: ///////////////////////////////////////////////////
oxtek 10:a358762e1188 185 //////////////////////////////////////////////////////////////////
oxtek 10:a358762e1188 186 if (trigger & 0x04) { /* Button 1 down */
oxtek 10:a358762e1188 187 pc.printf("STATE_B ");
oxtek 10:a358762e1188 188 do_task(2);
oxtek 10:a358762e1188 189 state = STATE_C;
oxtek 10:a358762e1188 190 pc.printf("will enter STATE_C \r\n");
oxtek 10:a358762e1188 191 }
oxtek 10:a358762e1188 192
oxtek 10:a358762e1188 193 //if (trigger & 0x02) { /* Button 2 down */
oxtek 10:a358762e1188 194 // do_task(3);
oxtek 10:a358762e1188 195 /* Remain in the same state */
oxtek 10:a358762e1188 196 //}
oxtek 10:a358762e1188 197 //if (trigger & 0x04) { /* Button 3 down */
oxtek 10:a358762e1188 198 // do_task(4);
oxtek 10:a358762e1188 199 // state = STATE_C;
oxtek 10:a358762e1188 200 //}
oxtek 10:a358762e1188 201
oxtek 10:a358762e1188 202 // trigger have to be set before state
oxtek 10:a358762e1188 203 //trigger = 0; /* Ignore other triggers in this state */
oxtek 10:a358762e1188 204 //state = STATE_A;
oxtek 10:a358762e1188 205 break;
oxtek 10:a358762e1188 206
oxtek 10:a358762e1188 207 //////////////////////////////////////////////////////////////////
oxtek 10:a358762e1188 208 case STATE_C: ///////////////////////////////////////////////////
oxtek 10:a358762e1188 209 //////////////////////////////////////////////////////////////////
oxtek 10:a358762e1188 210 if (trigger & 0x08) { /* Button 3 down */
oxtek 10:a358762e1188 211 pc.printf("STATE_C ");
oxtek 10:a358762e1188 212 do_task(3);
oxtek 10:a358762e1188 213 state = STATE_A;
oxtek 10:a358762e1188 214 pc.printf("will enter STATE_A \r\n");
oxtek 10:a358762e1188 215 }
oxtek 10:a358762e1188 216 // trigger has to be set before state
oxtek 10:a358762e1188 217 //trigger = 0;
oxtek 10:a358762e1188 218 //state = STATE_A;
oxtek 10:a358762e1188 219 break;
oxtek 10:a358762e1188 220 } // switch
oxtek 10:a358762e1188 221
oxtek 10:a358762e1188 222 }//while(1)
samux 7:5e693654d5b4 223 }