Diff: example2.cpp

Revision:

26:08f29af7bb0f

Parent:

25:ae0408ebdd68

--- a/example2.cpp	Tue Jan 08 18:01:03 2013 +0000
+++ /dev/null	Thu Jan 01 00:00:00 1970 +0000
@@ -1,167 +0,0 @@
-/*
-    Copyright (c) 2011 Andy Kirkham
- 
-    Permission is hereby granted, free of charge, to any person obtaining a copy
-    of this software and associated documentation files (the "Software"), to deal
-    in the Software without restriction, including without limitation the rights
-    to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-    copies of the Software, and to permit persons to whom the Software is
-    furnished to do so, subject to the following conditions:
- 
-    The above copyright notice and this permission notice shall be included in
-    all copies or substantial portions of the Software.
- 
-    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-    AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-    OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
-    THE SOFTWARE.
-    
-    @file          example2.cpp 
-    @purpose       Demos a simple messaging system.
-    @version       see ChangeLog.c
-    @date          Jan 2011
-    @author        Andy Kirkham
-*/
-
-/*
-    This example demostrates a simple "messaging" system. You can use it with
-    a terminal program to test it out or write a cusom C#/C++/VB/etc program
-    to read and write messages to or from the Mbed. The default baud rate in
-    this example is 115200.
-    
-    In this example, the LEDs are controlled and pins p21 to p24 are set as
-    InterruptIn and send messages out when their value changes.
-    
-    To use, hook up the MBed USB and open your fav terminal. All messages
-    end with the \n character, don't forget to hit carriage return!. 
-    As an example:-
-        
-        to switch on LED1 send LED1:1\n, off is LED1:0\n and toggle is LED1:2\n
-        to switch on LED2 send LED2:1\n, off is LED2:0\n and toggle is LED2:2\n
-        to switch on LED3 send LED3:1\n, off is LED3:0\n and toggle is LED3:2\n
-        to switch on LED4 send LED4:1\n, off is LED4:0\n and toggle is LED4:2\n
-        
-    When a pin change on p21 to p24 happens, a message is sent. As an example
-    when p21 goes low PIN21:0\n is sent, when goes high PIN21:1\n is sent.
-    
-    Note, the InterruptIn pins p21 to p24 are setup to have pullups. This means
-    they are high. To activate them use a wire to short the pin to 0volts.
-    
-    If you find that p21 to p24 sent a lot of on/off/on/off then it's probably
-    due to "bounce". If you are connecting a mechanical switch to a pin you
-    may prefer to use the PinDetect library rather than using InterruptIn.
-    @see http://mbed.org/users/AjK/libraries/PinDetect/latest
-    
-    One point you may notice. Incoming messages are processed via main()'s
-    while(1) loop whereas pin changes have their messages directly sent.
-    The reason for this is when MODSERIAL makes callbacks to your application
-    it is in "interrupt context". And one thing you want to avoid is spending
-    lots of CPU time in that context. So, the callback moves the message from
-    the input buffer to a local holding buffer and it then sets a bool flag
-    which tells main()'s while(1) loop to process that buffer. This means the 
-    time spent doing the real incoming message handing is within your program
-    and not within MODSERIAL's interrupt context. So you may ask, why not do
-    the same for out going messages? Well, because MODSERIAL output buffers
-    all your sent content then sending chars is very fast. MODSERIAL handles
-    all the nitty gritty bits for you. You can just send. This example uses
-    puts() to send the message. If you can, always try and use sprintf()+puts()
-    rathe than printf(), printf() is known to often screw things up when used
-    within an interrupt context. Better still, just use puts() and do away
-    with any of the crappy ?printf() calls if possible. But I found the code
-    below to work fine even at 115200baud.
-    
-*/
-
-
-#ifdef COMPILE_EXAMPLE1_CODE_MODSERIAL
-
-#include "mbed.h"
-#include "MODSERIAL.h"
-
-#define MESSAGE_BUFFER_SIZE 32
-
-DigitalOut led1(LED1);
-DigitalOut led2(LED2);
-DigitalOut led3(LED3);
-DigitalOut led4(LED4);
-
-InterruptIn P21(p21);
-InterruptIn P22(p22);
-InterruptIn P23(p23);
-InterruptIn P24(p24);
-
-MODSERIAL messageSystem(USBTX, USBRX);
-
-char messageBufferIncoming[MESSAGE_BUFFER_SIZE];
-char messageBufferOutgoing[MESSAGE_BUFFER_SIZE];
-bool messageReceived;
-
-void messageReceive(MODSERIAL_IRQ_INFO *q) {
-    MODSERIAL *sys = q->serial;
-    sys->move(messageBufferIncoming, MESSAGE_BUFFER_SIZE);
-    messageReceived = true;
-    return 0;
-}
-
-void messageProcess(void) {
-         if (!strncmp(messageBufferIncoming, "LED1:1", sizeof("LED1:1")-1)) led1 = 1;
-    else if (!strncmp(messageBufferIncoming, "LED1:0", sizeof("LED1:0")-1)) led1 = 0;
-    else if (!strncmp(messageBufferIncoming, "LED1:2", sizeof("LED1:2")-1)) led1 = !led1;
-    
-    else if (!strncmp(messageBufferIncoming, "LED2:1", sizeof("LED2:1")-1)) led2 = 1;
-    else if (!strncmp(messageBufferIncoming, "LED2:0", sizeof("LED2:0")-1)) led2 = 0;
-    else if (!strncmp(messageBufferIncoming, "LED2:2", sizeof("LED2:2")-1)) led2 = !led2;
-    
-    else if (!strncmp(messageBufferIncoming, "LED3:1", sizeof("LED3:1")-1)) led3 = 1;
-    else if (!strncmp(messageBufferIncoming, "LED3:0", sizeof("LED3:0")-1)) led3 = 0;
-    else if (!strncmp(messageBufferIncoming, "LED3:2", sizeof("LED3:2")-1)) led3 = !led3;
-    
-    else if (!strncmp(messageBufferIncoming, "LED4:1", sizeof("LED4:1")-1)) led4 = 1;
-    else if (!strncmp(messageBufferIncoming, "LED4:0", sizeof("LED4:0")-1)) led4 = 0;
-    else if (!strncmp(messageBufferIncoming, "LED4:2", sizeof("LED4:2")-1)) led4 = !led4;
-    
-    messageReceived = false;
-}
-
-#define PIN_MESSAGE_SEND(x,y) \
-    sprintf(messageBufferOutgoing,"PIN%02d:%d\n",x,y);\
-    messageSystem.puts(messageBufferOutgoing);
-
-void pin21Rise(void) { PIN_MESSAGE_SEND(21, 1); }
-void pin21Fall(void) { PIN_MESSAGE_SEND(21, 0); }
-void pin22Rise(void) { PIN_MESSAGE_SEND(22, 1); }
-void pin22Fall(void) { PIN_MESSAGE_SEND(22, 0); }
-void pin23Rise(void) { PIN_MESSAGE_SEND(23, 1); }
-void pin23Fall(void) { PIN_MESSAGE_SEND(23, 0); }
-void pin24Rise(void) { PIN_MESSAGE_SEND(24, 1); }
-void pin24Fall(void) { PIN_MESSAGE_SEND(24, 0); }
-
-int main() {
-
-    messageReceived = false;
-    messageSystem.baud(115200);
-    messageSystem.attach(&messageReceive, MODSERIAL::RxAutoDetect);
-    messageSystem.autoDetectChar('\n'); 
-
-    // Enable pullup resistors on pins.
-    P21.mode(PullUp); P22.mode(PullUp); P23.mode(PullUp); P24.mode(PullUp);
-    
-    // Fix Mbed library bug, see http://mbed.org/forum/bugs-suggestions/topic/1498
-    LPC_GPIOINT->IO2IntClr = (1UL << 5) | (1UL << 4) | (1UL << 3) | (1UL << 2); 
-    
-    // Attach InterruptIn pin callbacks.
-    P21.rise(&pin21Rise); P21.fall(&pin21Fall);
-    P22.rise(&pin22Rise); P22.fall(&pin22Fall);
-    P23.rise(&pin23Rise); P23.fall(&pin23Fall);
-    P24.rise(&pin24Rise); P24.fall(&pin24Fall);
-    
-    while(1) {
-        // Process incoming messages.
-        if (messageReceived) messageProcess();
-    }
-}
-
-#endif