File content as of revision 0:c1332385cffa:

#include "mbed.h"
#include "mcp4725.h"
#include "TextLCD.h"
#include "math.h"
 
TextLCD lcd(p14, p13, p21, p22, p23, p24, TextLCD::LCD16x2); // rs, e, d4-d7
//
DigitalOut testLed(LED1);
Serial pc(USBTX, USBRX);
AnalogIn analogIn(p15);
// init the DAC module
MCP4725 DAC(p28, p27, MCP4725::Standard100kHz, 0);
//define custom characters
const char sin_char_top[]  = { 0x0, 0xe,0x11,0x11, 0x0, 0x0, 0x0, 0x0};
const char sin_char_bot[]  = { 0x0, 0x0, 0x0, 0x0,0x11,0x11, 0xe, 0x0};
const char sq_char_left[]  = {0x1c, 0x4, 0x4, 0x4, 0x4, 0x4, 0x4, 0x7};
const char sq_char_right[] = { 0x7, 0x4, 0x4, 0x4, 0x4, 0x4, 0x4,0x1c};
const double pi = 3.14159;
int main() {
    //set custom characters
    lcd.setUDC(0, (char *) sin_char_bot);
    lcd.setUDC(1, (char *) sin_char_top);
    lcd.setUDC(2, (char *) sq_char_left);
    lcd.setUDC(3, (char *) sq_char_right);
    int RUN = 0; //start = 1, stop = 0
    int SIGNAL_MODE = 0; //1sin,10ksin,1sq,10ksq = 0,1,2,3

    while(1) {
        int dots = 0;
        while(RUN == 0)
            {
                lcd.setCursor(TextLCD::CurOff_BlkOff);
                lcd.setAddress(0, 0);
                lcd.printf("Waveform: off\n");
                if(dots == 0){
                    lcd.printf("waiting");
                    dots++;
                    }
                else if(dots == 1){
                    lcd.printf("waiting.");
                    dots++;
                    }
                else if(dots == 2){
                    lcd.printf("waiting..");
                    dots++;
                    }
                else if(dots == 3){
                    lcd.printf("waiting...");
                    dots = 0;
                    }
                else{
                    lcd.printf("ERROR CASE");
                    }
                wait_ms(100);
            }
        int i = 0;
        while(RUN == 1)
            {
                //set display on
                lcd.setCursor(TextLCD::CurOff_BlkOff);
                lcd.setAddress(0, 0);
                lcd.printf("Waveform: on\n");
                
                if(SIGNAL_MODE == 0){
                    //sin wave 1Hz or 1s
                    lcd.putc(0); lcd.putc(1); lcd.printf("1Hz Sin Wav");
                    
                    double j = 1.65*sin(2*pi*i/100)+1.65;
                    DAC.write(MCP4725::Normal, (0xFFF * (j/3.3)), false);
                    wait_ms(5);
                    i++;
                    } //end if case
                else if(SIGNAL_MODE == 1){
                    //sin wave 10kHz or 100us
                    lcd.putc(0); lcd.putc(1); lcd.printf("10kHz Sin Wav");
                    
                    double k = 1.65*sin(2*pi*i/100)+1.65;
                    DAC.write(MCP4725::Normal, (0xFFF * (k/3.3)), false);
                    wait_us(0.5);
                    i++;
                    } //end if case
                else if(SIGNAL_MODE == 2){
                    //square wave 1Hz or 1s
                    lcd.putc(2); lcd.putc(3); lcd.printf("1Hz Sq Wav");
                    
                    DAC.write(MCP4725::Normal, 0xFFF, false);
                    wait_ms(500);
                    DAC.write(MCP4725::Normal, 0x000, false);
                    wait_ms(500);
                    } //end if case
                else if(SIGNAL_MODE == 3){
                    //square wave 10kHz or 100us
                    lcd.putc(2); lcd.putc(3); lcd.printf("10kHz Sq Wav");
                    
                    DAC.write(MCP4725::Normal, 0xFFF, false);
                    wait_us(50);
                    DAC.write(MCP4725::Normal, 0x000, false);
                    wait_us(50);
                    } //end if case
                else{
                    lcd.printf("ERROR CASE");
                    //do nothing
                    } //end default
            } //end while(on) loop
    } //end while(1) loop
} //end main