File content as of revision 1:4f46d81502aa:

#include "mbed.h"
#include "menbed.h"

AnalogIn photocell(p15);
PwmOut led1(LED1);
PwmOut led2(LED2);
DigitalOut led3(LED3);
DigitalOut led4(LED4);

float photocellVoltage(void) {return 3.3 * photocell;}
void setLed1Pwm (float d) {led1 = d / 100.0;}
float getLed1Pwm (void) {return led1 * 100.0;}
void setLed2Pwm (float d) {led2 = d / 100.0;}
float getLed2Pwm (void) {return led2 * 100.0;}
void toggleLed3 () {led3 = led3 ^ 1;}
void lightLed4 () {led4 = 1;}
void extinguishLed4 () {led4 = 0;}

int main() {

    // Declare all the submenus so that they can be referenced in the
    // definitions of other menus
    MenbedMenu *rootMenu;
    MenbedMenu *measurementMenu;
    MenbedMenu *controlMenu;
    MenbedMenu *aboutMenu;

    // Root menu--to create a menu, we first create an array of pointers to 
    // all the menu items that will populate the menu.  The MenbedMenuItem
    // constructor take five arguments: the function to be executed when the
    // item is selected; the child menu to open when the item is selected;
    // a boolean indicating whether the child menu is actually this menu's
    // ancestor, (useful when creating "go to root menu" items); a parameter
    // object that holds a value to be viewed or modified; and a text string
    // indicating what the menu item should say.  The text string may contain
    // a printf-style specifier for a float that is bracketed by \t characters
    // to offset it from the surrounding text.  If the float specified is
    // found, it will be replaced by the value of the parameter.
    MenbedMenuItem *rootMenuItems[3] = {
        new MenbedMenuItem (NULL, &measurementMenu, false, NULL, "Measurements"),
        new MenbedMenuItem (NULL, &controlMenu, false, NULL, "Controls"),
        new MenbedMenuItem (NULL, &aboutMenu, false, NULL, "About"),
    };
    // After we have the array of pointers to menu items, we pass the number of
    // elements in the arry and the array itself to the MenbedMenu constructor.
    rootMenu = new MenbedMenu (3, rootMenuItems);

    // Measurements menu--the first item of the measurement menu displays the
    // voltage and the resistor divider junction formed between a photocell and
    // a fixed resistor.  To print this voltage as part of a menu item, we
    // create a MenbedMenuParam object that takes as arguments to its
    // constructor: a pointer to a function that returns a float containing the
    // value of the parameter; a pointer to a function that we would call to 
    // change the value of the parameter; a boolean (irrevelant here)
    // indicating whether the parameter, if it were modifiable by the user, 
    // should be updated as the user is changing its value or whether its
    // should only be updated after the user has confirmed the new value; a 
    // minimum value for the parameter; a maximum value; and a step size.
    MenbedMenuParam photocellParam (photocellVoltage, NULL, false, 0.0, 0.0, 0.0);
    // Having created the parameter, we pass it as the 4th argument of the 
    // MenbedMenuItem constructor.  Note the \t-offset %.2f format specified
    // in the menu item text.  The menu system will call the photocellVoltage
    // function specified in the parameter constructor above and then print the
    // float that it returns in place of the %.2f in the menu text.
    MenbedMenuItem *measurementMenuItems[2] = {
        new MenbedMenuItem (NULL, NULL, false, &photocellParam, "Photocell: \t%.2f\tV"),
        new MenbedMenuItem (NULL, &rootMenu, true, NULL, "Home") };
    measurementMenu = new MenbedMenu (2, measurementMenuItems);

    // Controls menu--We have modifiable parameters in the first and second
    // meu items of the controls menu.  Walking through the first parameter
    // constructor, the getLed1Pwm function pointer points to a function that
    // returns the current value of the PWM duty cycle.  The setLed1Pwm 
    // function pointer points to a function which sets the PWM duty cycle.
    // The boolean set to true indicates that as soon as the user makes a 
    // change to the parameter, the setLed1Pwm function will be called.  The
    // menu system will not wait for the user to confirm his change before
    // making the call.  The 0.0 and 100.0 represent the minimum and 
    // maximum PWM values.  The final 1.0 paramter is the step size when
    // changing the PWM duty cycle.
    MenbedMenuParam pwmParam1 (getLed1Pwm, setLed1Pwm, true, 0.0, 100.0, 1.0);
    // The only different in this parameter from the one above is that the PWM
    // duty cycle is not updated (setLed2Pwm is not called) until the user
    // confirms the new duty cycle.  If the user cancels his modifications
    // (either by pushing the cancel button or pushing and holding the select
    // button) setLed2PWM is never called.
    MenbedMenuParam pwmParam2 (getLed2Pwm, setLed2Pwm, false, 0.0, 100.0, 1.0);
    // The third, fourth, and fifth items of the control menu demonstrate
    // functions when a menu item is selected.  The ability to call a function
    // can be combined with either displaying a submenu or editing a parameter.
    MenbedMenuItem *controlMenuItems[6] = {
        new MenbedMenuItem (NULL, NULL, false, &pwmParam1, "LED1 PWM: \t%.0f\t%"),
        new MenbedMenuItem (NULL, NULL, false, &pwmParam2, "LED2 PWM: \t%.0f\t%"),
        new MenbedMenuItem (toggleLed3, NULL, false, NULL, "Toggle LED3"),
        new MenbedMenuItem (lightLed4, NULL, false, NULL, "Light LED4"),
        new MenbedMenuItem (extinguishLed4, NULL, false, NULL, "Extinguish LED4"),
        new MenbedMenuItem (NULL, &rootMenu, true, NULL, "Home") };
    controlMenu = new MenbedMenu (6, controlMenuItems);       

    // About menu--there's nothing fancy here, but the lack of a "Home" item
    // forces the user to employ the cancel button, either directly or by
    // pushing and hold the select button, to return to the root menu.
    MenbedMenuItem *aboutMenuItems[3] = {
        new MenbedMenuItem (NULL, NULL, false, NULL, "     NXP3915"),
        new MenbedMenuItem (NULL, NULL, false, NULL, "  Copyright 2011"),
        new MenbedMenuItem (NULL, NULL, false, NULL, " xxxxxxxx@xxx.xxx") };
    aboutMenu = new MenbedMenu (3, aboutMenuItems);
            
    // Having created the menus, menu items, and item parameters, we are ready
    // to instantiate the display.  MenbedDisplayHD44780 extends MenbedDisplay
    // and implements the all-important writeLine function allong with some
    // other less important functions.  The pins we pass to the constructor
    // specify the physical interface connection to the LCD.
    MenbedDisplayHD44780 *hd44780Lcd = new MenbedDisplayHD44780 
        (p25, p26, p27, p28, p29, p30, MenbedDisplayHD44780::LCD20x4);

    // Now, we have the menu objects and the display object.  All we have to do
    // is create the menbed menu system.  The number of buttons used by the
    // menu system is specified by the number of pins passed to the Menbed 
    // constructor.  The pin order is select, down, up, cancel.  With 
    // constructor overloading, we can opt out of using the cancel and up
    // buttons.

    /* Four buttons (select, down, up, cancel ) */    
    Menbed menbed(p22, p24, p23, p21,
        rootMenu,
        hd44780Lcd);
    

    /* Three buttons (select, down, up) */
    /*
    Menbed menbed(p22, p24, p23,
        &rootMenu,
        hd44780Lcd);
    */
    
    /* Two buttons (select, down) */
    /*  
    Menbed menbed(p22, p24,
        &rootMenu,
        hd44780Lcd);        
    */

    // The menu system runs in the background using Ticker objects.  The user
    // can now run whatever application code he pleases.
    while(1) {}
}