Lpc2000

Hi,
Thank you very much for your suggestions. Those are really worthy 
me. Especially your tease helped me to breathe normally and feel 
that microcontroller world is not that magical what I thought. 
 
"Feel like Alice in Wonderland???"

==>In fact my position is just opposite; because I got nobody beside 
me here. So, mentally I was depressed. Only help I have is the 
internet groups and forums. So, I am little bit nervous.

I am trying to understand datasheets and started reading the 
helpfiles came with the IAR workbench compiler.

Thank you. 
 
--- In lpc2000@yahoogroups.com, Rob Jansen <rob@m...> wrote:
>
> Mahbub1833,
> 
> feel like Alice in Wonderland ???
> 
> >I am newbie in microcontroller world as well as in great ARM 
world.
> >
> >WORTHLESS TALK:
> >Although I know that ARM microcontrollers are for the 
professionals; 
> >  
> >
> 
> Welcome in the wonderfull world of ARM microcontrollers, 
defenitely not 
> only for the professionals.
> With different not-too-expensive boards and free Gnu C compiler it 
is a 
> real nice target for hobbyists also.
> 
> >BLOODY REQUEST:
> >My request goes to all great professionals of this group. Please 
> >make a starting point for us (newbie). More examples and projects 
> >are needed to learn programming LPC series smoothly. Especially 
step 
> >by step tutorial with code would be great. (Please give me some 
link 
> >if there any). 
> >  
> >
> It should not be that hard if you start from the IAR examples - I 
guess 
> they have a "Hello World" in the form of a flashing LED or 
something 
> similar. These are always nice examples to start from.
> There is also a good book from Hitex (called something like "The 
> insiders guide to the ARM7") to start with.
> 
> >NEED HELP:
> >
> >I have IAR LPC2148 development kit and J-Link adapter. I tried 
> >example codes using IAR workbench and those run fine. But I 
couldn't 
> >understand the coding with my little PC based programming 
knowledge. 
> >Now my questions are- 
> >
> >1. How would I learn C language specified for this particular 
> >microcontroller? 
> >  
> >
> There is nothing special or magical about C for the lpc21xx 
series. It 
> is just standard (ANSI compliant) C.
> You just have to remember that you do not have all resources as 
you have 
> on a PC. For printf() you need a console - most development 
environments 
> will support this.
> For file I/O you need a storage device - not standard available so 
> forget this for the time being.
> Accessing stuff like the LEDs and other I/O on the board need the 
> different peripheral blocks in the chip. Check out the Philips 
website 
> (www.semiconductors.philips.com) and get the datasheet and - more 
> important - the user manual for your chip.
> This user manual contains detailed information on the meaning of 
all the 
> bits in the I/O registers.
> 
> Note: all I/O is memory mapped an can be read and written using a 
> standard C pointer, but it has to be declared volatile - otherwise 
the 
> compiler may optimize this out ...
> 
> Okay, you got all this ...
> Take your simplest Keil example and try to add code to light an 
LED on 
> the board.
> 
> Now you need some hardware knowledge of the board:
>     When is the LED lit? when the output port is tied to ground or 
to 3.3V ?
>     What is the output bit ?
> 
> Assume the LED is lit when tied to ground, you need to program a 0 
level 
> in the output bit.
> Assume the output bit is P0.20.
> 
> Start reading the user manual of the 2148.
> Chapter 8.4.1 shows the meaning and content of the IODIR register, 
this 
> register determines if a bit is an input or output bit. You have 
to set 
> bit 20 to make P0.20 an output port:
> 
>     IO0DIR |= (1<<20);  // Perform a logical OR of IODIR to set 
bit 20 to 1
> 
> (note: IO0DIR can also be called IODIR0, it is defined in the 
lpc21xx.h 
> - or similar - include file)
> 
> Now all you have to do is set the P0.20 bit to 0, there are two 
ways to 
> do this. See 8.4.3, 8.4.4 and 8.4.5
> You can write all bits using the IO0PIN register (you need to 
apply a 
> mask to set or reset the bits you want), use IO0SET to set any 
bits to 1 
> or IO0CLR to clear any bits (set bits to 0).
> Read the manual: "Writing a 1 produces a low level at the 
corresponding 
> port pins"
> 
>     IO0CLR = (1<<20);
> 
> You don't need any mask or whatever, just writing a 1 is enough - 
as is 
> stated in the manual.
> 
> Now compile the program and download it to your board.
> You may want to check that you compile and download into RAM, not 
in Flash.
> Flash has a limited number of write cycles - do not worry too much 
about 
> this, it's a large number but for these simple tests it is just a 
waste 
> to program flash.
> Then download and run using the IAR debugger.
> 
> Please check the IAR / J-Link manuals on this.
> 
> >5. Somebody please upload or link few more codes to learn step by 
> >step. 
> >  
> >
> The problem is that we all have our favorite environment.
> I use a board from Embedded Artists and they have their own make 
> environment, farily well documented in the manual.
> That manual is available via their web page and an example can be 
found 
> somewhere on my ARM page (http://www.myvoice.nl/electronics/)
> Check out "Timing your programs" that one contains a simple piece 
of 
> code to read a timer and print data on the serial port (UART0).
> 
> 
> >6. Suppose I want to interface a LDR to the circuit and want to 
show 
> >the value in the LCD display. Now which pin (AD) would I use to 
> >connect the LDR? And what would be the program? 
> >  
> >
> Read the manual, as far as I know all AD ports are the same. It 
just 
> depends on which pin is still available on your board for your own 
I/O.
> 
> The program is simple:
> 
>     1) initialize A/D (and UART)
>     2) start A/D conversion
>     3) wait for A/D conversion to be complete
>     4) print out value of the UART
>     5) repeat ...
> 
> Just start reading the user manual carefully. It's all there - 
Best is 
> to read and then drop your detailed questions in this group again.
> 
> >I apologize for my kiddy questions in the professional group. I 
need 
> >your help to go ahead in the microcontroller world.
> >
> we all have to start somewhere. I started about 25 years ago with 
a home 
> built 6502 kit from Elektor, meanwhile I have no problems reading 
> datasheets and user manuals for chips like the lpc2148.
> But I do have problems with standard Windows programming and that 
kind 
> of things. Programming web tablets, telephones and telephone 
exchanges 
> is what I did, but do not ask me to write a Visual C (or Basic) 
version 
> of a calculator ...
> 
> Oh, this group is mixed with professionals and hobbyists on all 
sorts of 
> levels. So all levels of Questions are welcome!
> In time you will be able to tell other how to ...
> 
> Good Luck,
> 
>     Rob
>