Little easy(for you) program on LPC2138 . ARM

[komabra]

Hello. I have a problem. I don't want to cheat you.I'm good at maths, physics but... agrrr... programming is my Achilles heel. I have never known how to deal with it. It's just like magic to me. I know that every forum's maxim is to try to make sth alone but i dont have any choice...

I have to make a program, but I just don't know anything how to do it.:sad:

I have to do it on microcontroller LPC2138.

So.. It figures on it, that by clicking on buttons S1...S4 there must appear a sound. I have to do it using Digital-to-analog converter (DAC).Probably by changing voltage and then there will be 4 different sunds.

I have nearly the same program that is using ' "beep"command ' ( I dont know how to say it in english. sorry). Someone said that it's nearly finished but there is needed to change some things.( only change beep to DAC )

//buczek podpiety pod p0.26
//ledy p1.16
//buttons s1:s4 p0.4..7
#include <lpc213x.h>
void beep (unsigned int del_time)
{
unsigned int i;
IOSET0= 1<<26;
for(i=0; i<del_time;i++);
IOCLR0=1<<26;
for(i=0;i<del_time; i++);
}
int main (void)
{
IODIR0=0xFFFF0000;
IODIR1=0x00FF0000;
while(1)
{
IOCLR1=0x00FF0000;
if(!(IOPIN0 & 0x00000010))
{
IOSET1=1<<16;
beep(5000);
}
if(!(IOPIN0 & 0x00000020))
{
IOSET1=1<<17;
beep(20000);
}
if(!(IOPIN0 & 0x00000040))
{
IOSET1=1<<18;
beep(30000);
}
if(!(IOPIN0 & 0x00000080))
{
IOSET1=1<<19;
beep(40000);
}
}
}

I can also pay or help with sth to someone who will help with this program because it's so important to me.. but as I said. I dont want to lie. I'm a student from Poland so i dont have much money.

Thanks