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Dependencies:   mbed CANBuffer Watchdog MODSERIAL mbed-rtos xbeeRelay IAP

Fork of SystemManagement by Martin Deng

Libs/MODSERIAL/example2.cpp@31:7eaa5e881b56, 2014-11-14 (annotated)

Committer:
pspatel321
Date:
Fri Nov 14 06:05:59 2014 +0000
Revision:
31:7eaa5e881b56
Mostly working.  Wrote CAN in/out code.  Xbee still needs work.  My guess is that MODDMA breaks when used with RTOS.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
pspatel321 31:7eaa5e881b56 1 /*
pspatel321 31:7eaa5e881b56 2 Copyright (c) 2011 Andy Kirkham
pspatel321 31:7eaa5e881b56 3
pspatel321 31:7eaa5e881b56 4 Permission is hereby granted, free of charge, to any person obtaining a copy
pspatel321 31:7eaa5e881b56 5 of this software and associated documentation files (the "Software"), to deal
pspatel321 31:7eaa5e881b56 6 in the Software without restriction, including without limitation the rights
pspatel321 31:7eaa5e881b56 7 to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
pspatel321 31:7eaa5e881b56 8 copies of the Software, and to permit persons to whom the Software is
pspatel321 31:7eaa5e881b56 9 furnished to do so, subject to the following conditions:
pspatel321 31:7eaa5e881b56 10
pspatel321 31:7eaa5e881b56 11 The above copyright notice and this permission notice shall be included in
pspatel321 31:7eaa5e881b56 12 all copies or substantial portions of the Software.
pspatel321 31:7eaa5e881b56 13
pspatel321 31:7eaa5e881b56 14 THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
pspatel321 31:7eaa5e881b56 15 IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
pspatel321 31:7eaa5e881b56 16 FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
pspatel321 31:7eaa5e881b56 17 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
pspatel321 31:7eaa5e881b56 18 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
pspatel321 31:7eaa5e881b56 19 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
pspatel321 31:7eaa5e881b56 20 THE SOFTWARE.
pspatel321 31:7eaa5e881b56 21
pspatel321 31:7eaa5e881b56 22 @file example2.cpp
pspatel321 31:7eaa5e881b56 23 @purpose Demos a simple messaging system.
pspatel321 31:7eaa5e881b56 24 @version see ChangeLog.c
pspatel321 31:7eaa5e881b56 25 @date Jan 2011
pspatel321 31:7eaa5e881b56 26 @author Andy Kirkham
pspatel321 31:7eaa5e881b56 27 */
pspatel321 31:7eaa5e881b56 28
pspatel321 31:7eaa5e881b56 29 /*
pspatel321 31:7eaa5e881b56 30 This example demostrates a simple "messaging" system. You can use it with
pspatel321 31:7eaa5e881b56 31 a terminal program to test it out or write a cusom C#/C++/VB/etc program
pspatel321 31:7eaa5e881b56 32 to read and write messages to or from the Mbed. The default baud rate in
pspatel321 31:7eaa5e881b56 33 this example is 115200.
pspatel321 31:7eaa5e881b56 34
pspatel321 31:7eaa5e881b56 35 In this example, the LEDs are controlled and pins p21 to p24 are set as
pspatel321 31:7eaa5e881b56 36 InterruptIn and send messages out when their value changes.
pspatel321 31:7eaa5e881b56 37
pspatel321 31:7eaa5e881b56 38 To use, hook up the MBed USB and open your fav terminal. All messages
pspatel321 31:7eaa5e881b56 39 end with the \n character, don't forget to hit carriage return!.
pspatel321 31:7eaa5e881b56 40 As an example:-
pspatel321 31:7eaa5e881b56 41
pspatel321 31:7eaa5e881b56 42 to switch on LED1 send LED1:1\n, off is LED1:0\n and toggle is LED1:2\n
pspatel321 31:7eaa5e881b56 43 to switch on LED2 send LED2:1\n, off is LED2:0\n and toggle is LED2:2\n
pspatel321 31:7eaa5e881b56 44 to switch on LED3 send LED3:1\n, off is LED3:0\n and toggle is LED3:2\n
pspatel321 31:7eaa5e881b56 45 to switch on LED4 send LED4:1\n, off is LED4:0\n and toggle is LED4:2\n
pspatel321 31:7eaa5e881b56 46
pspatel321 31:7eaa5e881b56 47 When a pin change on p21 to p24 happens, a message is sent. As an example
pspatel321 31:7eaa5e881b56 48 when p21 goes low PIN21:0\n is sent, when goes high PIN21:1\n is sent.
pspatel321 31:7eaa5e881b56 49
pspatel321 31:7eaa5e881b56 50 Note, the InterruptIn pins p21 to p24 are setup to have pullups. This means
pspatel321 31:7eaa5e881b56 51 they are high. To activate them use a wire to short the pin to 0volts.
pspatel321 31:7eaa5e881b56 52
pspatel321 31:7eaa5e881b56 53 If you find that p21 to p24 sent a lot of on/off/on/off then it's probably
pspatel321 31:7eaa5e881b56 54 due to "bounce". If you are connecting a mechanical switch to a pin you
pspatel321 31:7eaa5e881b56 55 may prefer to use the PinDetect library rather than using InterruptIn.
pspatel321 31:7eaa5e881b56 56 @see http://mbed.org/users/AjK/libraries/PinDetect/latest
pspatel321 31:7eaa5e881b56 57
pspatel321 31:7eaa5e881b56 58 One point you may notice. Incoming messages are processed via main()'s
pspatel321 31:7eaa5e881b56 59 while(1) loop whereas pin changes have their messages directly sent.
pspatel321 31:7eaa5e881b56 60 The reason for this is when MODSERIAL makes callbacks to your application
pspatel321 31:7eaa5e881b56 61 it is in "interrupt context". And one thing you want to avoid is spending
pspatel321 31:7eaa5e881b56 62 lots of CPU time in that context. So, the callback moves the message from
pspatel321 31:7eaa5e881b56 63 the input buffer to a local holding buffer and it then sets a bool flag
pspatel321 31:7eaa5e881b56 64 which tells main()'s while(1) loop to process that buffer. This means the
pspatel321 31:7eaa5e881b56 65 time spent doing the real incoming message handing is within your program
pspatel321 31:7eaa5e881b56 66 and not within MODSERIAL's interrupt context. So you may ask, why not do
pspatel321 31:7eaa5e881b56 67 the same for out going messages? Well, because MODSERIAL output buffers
pspatel321 31:7eaa5e881b56 68 all your sent content then sending chars is very fast. MODSERIAL handles
pspatel321 31:7eaa5e881b56 69 all the nitty gritty bits for you. You can just send. This example uses
pspatel321 31:7eaa5e881b56 70 puts() to send the message. If you can, always try and use sprintf()+puts()
pspatel321 31:7eaa5e881b56 71 rathe than printf(), printf() is known to often screw things up when used
pspatel321 31:7eaa5e881b56 72 within an interrupt context. Better still, just use puts() and do away
pspatel321 31:7eaa5e881b56 73 with any of the crappy ?printf() calls if possible. But I found the code
pspatel321 31:7eaa5e881b56 74 below to work fine even at 115200baud.
pspatel321 31:7eaa5e881b56 75
pspatel321 31:7eaa5e881b56 76 */
pspatel321 31:7eaa5e881b56 77
pspatel321 31:7eaa5e881b56 78
pspatel321 31:7eaa5e881b56 79 #ifdef COMPILE_EXAMPLE1_CODE_MODSERIAL
pspatel321 31:7eaa5e881b56 80
pspatel321 31:7eaa5e881b56 81 #include "mbed.h"
pspatel321 31:7eaa5e881b56 82 #include "MODSERIAL.h"
pspatel321 31:7eaa5e881b56 83
pspatel321 31:7eaa5e881b56 84 #define MESSAGE_BUFFER_SIZE 32
pspatel321 31:7eaa5e881b56 85
pspatel321 31:7eaa5e881b56 86 DigitalOut led1(LED1);
pspatel321 31:7eaa5e881b56 87 DigitalOut led2(LED2);
pspatel321 31:7eaa5e881b56 88 DigitalOut led3(LED3);
pspatel321 31:7eaa5e881b56 89 DigitalOut led4(LED4);
pspatel321 31:7eaa5e881b56 90
pspatel321 31:7eaa5e881b56 91 InterruptIn P21(p21);
pspatel321 31:7eaa5e881b56 92 InterruptIn P22(p22);
pspatel321 31:7eaa5e881b56 93 InterruptIn P23(p23);
pspatel321 31:7eaa5e881b56 94 InterruptIn P24(p24);
pspatel321 31:7eaa5e881b56 95
pspatel321 31:7eaa5e881b56 96 MODSERIAL messageSystem(USBTX, USBRX);
pspatel321 31:7eaa5e881b56 97
pspatel321 31:7eaa5e881b56 98 char messageBufferIncoming[MESSAGE_BUFFER_SIZE];
pspatel321 31:7eaa5e881b56 99 char messageBufferOutgoing[MESSAGE_BUFFER_SIZE];
pspatel321 31:7eaa5e881b56 100 bool messageReceived;
pspatel321 31:7eaa5e881b56 101
pspatel321 31:7eaa5e881b56 102 void messageReceive(MODSERIAL_IRQ_INFO *q) {
pspatel321 31:7eaa5e881b56 103 MODSERIAL *sys = q->serial;
pspatel321 31:7eaa5e881b56 104 sys->move(messageBufferIncoming, MESSAGE_BUFFER_SIZE);
pspatel321 31:7eaa5e881b56 105 messageReceived = true;
pspatel321 31:7eaa5e881b56 106 return 0;
pspatel321 31:7eaa5e881b56 107 }
pspatel321 31:7eaa5e881b56 108
pspatel321 31:7eaa5e881b56 109 void messageProcess(void) {
pspatel321 31:7eaa5e881b56 110 if (!strncmp(messageBufferIncoming, "LED1:1", sizeof("LED1:1")-1)) led1 = 1;
pspatel321 31:7eaa5e881b56 111 else if (!strncmp(messageBufferIncoming, "LED1:0", sizeof("LED1:0")-1)) led1 = 0;
pspatel321 31:7eaa5e881b56 112 else if (!strncmp(messageBufferIncoming, "LED1:2", sizeof("LED1:2")-1)) led1 = !led1;
pspatel321 31:7eaa5e881b56 113
pspatel321 31:7eaa5e881b56 114 else if (!strncmp(messageBufferIncoming, "LED2:1", sizeof("LED2:1")-1)) led2 = 1;
pspatel321 31:7eaa5e881b56 115 else if (!strncmp(messageBufferIncoming, "LED2:0", sizeof("LED2:0")-1)) led2 = 0;
pspatel321 31:7eaa5e881b56 116 else if (!strncmp(messageBufferIncoming, "LED2:2", sizeof("LED2:2")-1)) led2 = !led2;
pspatel321 31:7eaa5e881b56 117
pspatel321 31:7eaa5e881b56 118 else if (!strncmp(messageBufferIncoming, "LED3:1", sizeof("LED3:1")-1)) led3 = 1;
pspatel321 31:7eaa5e881b56 119 else if (!strncmp(messageBufferIncoming, "LED3:0", sizeof("LED3:0")-1)) led3 = 0;
pspatel321 31:7eaa5e881b56 120 else if (!strncmp(messageBufferIncoming, "LED3:2", sizeof("LED3:2")-1)) led3 = !led3;
pspatel321 31:7eaa5e881b56 121
pspatel321 31:7eaa5e881b56 122 else if (!strncmp(messageBufferIncoming, "LED4:1", sizeof("LED4:1")-1)) led4 = 1;
pspatel321 31:7eaa5e881b56 123 else if (!strncmp(messageBufferIncoming, "LED4:0", sizeof("LED4:0")-1)) led4 = 0;
pspatel321 31:7eaa5e881b56 124 else if (!strncmp(messageBufferIncoming, "LED4:2", sizeof("LED4:2")-1)) led4 = !led4;
pspatel321 31:7eaa5e881b56 125
pspatel321 31:7eaa5e881b56 126 messageReceived = false;
pspatel321 31:7eaa5e881b56 127 }
pspatel321 31:7eaa5e881b56 128
pspatel321 31:7eaa5e881b56 129 #define PIN_MESSAGE_SEND(x,y) \
pspatel321 31:7eaa5e881b56 130 sprintf(messageBufferOutgoing,"PIN%02d:%d\n",x,y);\
pspatel321 31:7eaa5e881b56 131 messageSystem.puts(messageBufferOutgoing);
pspatel321 31:7eaa5e881b56 132
pspatel321 31:7eaa5e881b56 133 void pin21Rise(void) { PIN_MESSAGE_SEND(21, 1); }
pspatel321 31:7eaa5e881b56 134 void pin21Fall(void) { PIN_MESSAGE_SEND(21, 0); }
pspatel321 31:7eaa5e881b56 135 void pin22Rise(void) { PIN_MESSAGE_SEND(22, 1); }
pspatel321 31:7eaa5e881b56 136 void pin22Fall(void) { PIN_MESSAGE_SEND(22, 0); }
pspatel321 31:7eaa5e881b56 137 void pin23Rise(void) { PIN_MESSAGE_SEND(23, 1); }
pspatel321 31:7eaa5e881b56 138 void pin23Fall(void) { PIN_MESSAGE_SEND(23, 0); }
pspatel321 31:7eaa5e881b56 139 void pin24Rise(void) { PIN_MESSAGE_SEND(24, 1); }
pspatel321 31:7eaa5e881b56 140 void pin24Fall(void) { PIN_MESSAGE_SEND(24, 0); }
pspatel321 31:7eaa5e881b56 141
pspatel321 31:7eaa5e881b56 142 int main() {
pspatel321 31:7eaa5e881b56 143
pspatel321 31:7eaa5e881b56 144 messageReceived = false;
pspatel321 31:7eaa5e881b56 145 messageSystem.baud(115200);
pspatel321 31:7eaa5e881b56 146 messageSystem.attach(&messageReceive, MODSERIAL::RxAutoDetect);
pspatel321 31:7eaa5e881b56 147 messageSystem.autoDetectChar('\n');
pspatel321 31:7eaa5e881b56 148
pspatel321 31:7eaa5e881b56 149 // Enable pullup resistors on pins.
pspatel321 31:7eaa5e881b56 150 P21.mode(PullUp); P22.mode(PullUp); P23.mode(PullUp); P24.mode(PullUp);
pspatel321 31:7eaa5e881b56 151
pspatel321 31:7eaa5e881b56 152 // Fix Mbed library bug, see http://mbed.org/forum/bugs-suggestions/topic/1498
pspatel321 31:7eaa5e881b56 153 LPC_GPIOINT->IO2IntClr = (1UL << 5) | (1UL << 4) | (1UL << 3) | (1UL << 2);
pspatel321 31:7eaa5e881b56 154
pspatel321 31:7eaa5e881b56 155 // Attach InterruptIn pin callbacks.
pspatel321 31:7eaa5e881b56 156 P21.rise(&pin21Rise); P21.fall(&pin21Fall);
pspatel321 31:7eaa5e881b56 157 P22.rise(&pin22Rise); P22.fall(&pin22Fall);
pspatel321 31:7eaa5e881b56 158 P23.rise(&pin23Rise); P23.fall(&pin23Fall);
pspatel321 31:7eaa5e881b56 159 P24.rise(&pin24Rise); P24.fall(&pin24Fall);
pspatel321 31:7eaa5e881b56 160
pspatel321 31:7eaa5e881b56 161 while(1) {
pspatel321 31:7eaa5e881b56 162 // Process incoming messages.
pspatel321 31:7eaa5e881b56 163 if (messageReceived) messageProcess();
pspatel321 31:7eaa5e881b56 164 }
pspatel321 31:7eaa5e881b56 165 }
pspatel321 31:7eaa5e881b56 166
pspatel321 31:7eaa5e881b56 167 #endif