On the web i have found a nice LCD library for use with a PIC16F877A. I worked with a sample but I need to change the output ports of the PIC.
The lib indicates a possibility but that does not work. So no other way then trying to understand the lib.
#define LCD_DATA_TRIS D
#define LCD_DATA_POS 0
//LCD_DATA_TRIS &=(~(0x0F<<LCD_DATA_POS));
TRISD &=(~0x0F);
The above brings me to a reduced and working macro but I want to eliminate it completely. Somehow that does not succeed. It has to do with the ~. I can not find the working of it.
Help appreciated
In the meanwhile I have found the answer.
TRISD &= 0xF0 since the ~ reverses all the bits in the hex value.
Related
I have a problem. I want to execute some commands in the Commandline of linux. I tested TProcess (So i am using Lazarus) but now when i am starting the programm, there is nothing, wich the Program do.
Here is my Code:
uses [...], unix, process;
[...]
var LE_Path: TLabeledEdit;
[...]
Pro1:=TProcess.Create(nil);
Pro1.CommandLine:=(('sudo open'+LE_Path.Text));
Pro1.Options := Pro1.Options; //Here i used Options before
Pro1.Execute;
With this Program, i want to open Files with sudo (The Programm is running on the User Interface)
->Sorry for my Bad English; Sorry for fails in the Question: I am using StackOverflow the first time.
I guess the solution was a missing space char?
Change
Pro1.CommandLine:=(('sudo open'+LE_Path.Text));
to
Pro1.CommandLine:=(('sudo open '+LE_Path.Text));
# ----------------------------^--- added this space char.
But if you're a beginner programmer, my other comments are still worth considering:
trying to use sudo in your first bit of code may be adding a whole extra set of problems. SO... Get something easier to work first, maybe
/bin/ls -l /path/to/some/dir/that/has/only/a/few/files.
find out how to print a statement that will be executed. This is the most basic form of debugging and any language should support that.
Your english communicated your problem well enough, and by including sample code and reasonable (not perfect) problem description "we" were able to help you. In general, a good question contains the fewest number of steps to re-create the problem. OR, if you're trying to manipulate data,
a. small sample input,
b. sample output from that same input
c. your "best" code you have tried
d. your current output
e. your thoughts about why it is not working
AND comments to indicate generally other things you have tried.
Clearly, there is something wrong with my understanding of brainfuck, or there's something wrong with bf interpreter on ideone.com.
By entering code as simple as ,.,. (reads two characters and prints them), I get an error "bff: out of memory (871638280)" . Why do I get this ?
NOTE: The true problem is that I'm trying to solve a problem on SPOJ, and some code that works on brainfuck interpreters that I found across the internet, doesn't work on SPOJ and ideone.com.
It appears to work fine, my BF torture test runs properly.
ideone.com 9fQ2Ej
I am NOT going to try to fight this UI to make the BF look correct!
It's here:
https://github.com/rdebath/Brainfuck/blob/master/bitwidth.b
It does appear to have a large cells size though and isn't fast enough to offset this.
EDIT: (No newlines below Grrr)
Anyway Daniel Christofani's end test:
,>+++++++++,>+++++++++++[<++++++<++++++<+>>>-]<<.>.<<-.>.>.<<.
Gives 'LA' showing that the program accepts input successfully, gives the correct character for newline and gives '-1' for end of file. As it's a big cell interpreter this is perfectly acceptable.
HOWEVER; I do see your point, there's something weird going on I suggest you try one of the javaScript implementations. They run in your browser.
http://t-monster.com/apps/brainfuck_IDE
http://www.iwriteiam.nl/Ha_bf_online.html
http://brainfuck.devbar.de/
I'm Flexing a file with the
%option nounput
Option and using the command line
flex --nounput
And flex version 2.5.35.
However, the cpp output still contains the line
#define unput(c) yyunput( c, (yytext_ptr) )
And this causes compilation problems with g++ since unput is not used.
Is there some way to fix this problem in a "clean" way? The two dirty ways are obvious:
Use unput in some useless way.
Remove the line automatically from the generated cpp file using some script.
(I tried to flag this question as "problem no longer reproducible" but the flag timed-out/aged away. I'm answering it so that it does not remain an open unanswered question.)
As mentioned by #akond:
I don't experience this problem. The version I am using is the same (flex 2.5.35). %option nounput does the trick for me.
I also tried this on version 2.5.4 and can confirm there is no issue. The option --nounput is no longer recognised or documented; however, the %option nounput remains in the manual.
The cpp output still does contain the line #define unput(c) yyunput( c, yytext_ptr ) but this does not seem to generate any g++ errors for me. Are you using -pedantic-errors or some other similar option perhaps?
Good program but badly out of date documentation.
I found that version 2.6.4 accepts the nounput option and does the right thing.
Forgive me if this might be a dumb question but, I'm in an assembly class that was mostly taught using an emulated CPU that was supposed to teach the concepts of assembly code. We haven't even written an Intel program, so I'm trying to adjust. In our emulated CPU, we were able to generate a symbol table file that gave the bytes equivalent for instructions:
http://imgur.com/tw5S8.png
Would I be able to do such a thing with Intel x86 instructions?
Try IDA. It has an option to show binary values of opcodes.
EDIT: Well.. it's a disassembler. Try opening a binary file, and set the number of opcode bytes to show (in Options/General/) to something that is not zero.
If you are looking for an IDE that shows you in real time the opcodes for the instruction you've used, then I don't think you'll find one, because of lack of "market". Can you explain why you need it? Do you want to know just their length, or want to learn them? There is simple pattern for lengths, so by dissasembling many binaries you'll catch it. If it's the opcodes you want.. well, there are lots of them, almost no rules, and practically no use to do it.
I see.. then you have to generate the list file . Your assembler should have an option for that. (for NASM it's -l listfile). Just put any instruction(s) in your .asm file, and generate listing for it. It should contain the binary encoding for each instruction.
First, get Intel Instruction Set Refference, or, better, this link: http://siyobik.info/index.php?module=x86 . There you'll find that most opcodes have several encodings. In your particular case, the bit 1 of the opcode specifies direction, and since both operands are registers, you can toggle the direction and swap the register codes, and the result will be the same. Usually you have this freedom on most register to register arithmetic operations. To check this, try decompiling with IDA this source file:
db 02h, E0h
db 00h, C4h
There is a demo program shipped with fasm.dll which has an editor and hex-viewer:
I'm abusing the C preprocessor for my build system to produce a "readme" plain-text file and a web page from the same source file. The construction is something like this:
The actual definitions are in data.h:
#define WEBSITE "http://example.com"
Note that the // in the URL must be quoted, or else it will be treated as the start of a comment. A similar problem occurs when using a , in the argument; the quotes are necessary, or else the comma would be treated as an argument separator.
Using this header, a file readme.txt.pp is run through the C preprocessor:
#include "data.h"
Visit the website at WEBSITE!
Of course, the preprocessor output is:
Visit the website at "http://example.com"!
The quotes appear in the output. Is there any way, or workaround, to get this code to give the output:
Visit the website at http://example.com!
I'm using Visual C++ 2008. I know that the preprocessor is not the ideal tool for this job; suggestions that use other built-in VC++ features are also welcome. (I tried XML with XSLT, but it is impossible to include one XML file into another, which was a show-stopper.)
Regarding XSLT, have a look at the document() function to read from multiple source documents.
I don't think there's any way to remove the quotes from the value of WEBSITE, since they are there in the definition of the macro. You might consider using the m4 macro processor instead of the C preprocessor.
Probably being late for Thomas, this might, however, still be useful for anyone lately stumbling over this question like me...
Try this:
#define DUMMY
#define WEBSITE http:/DUMMY/example.com
So the line comment disappears, and the preprocessor resolves DUMMY to nothing.
Try disabling the C++ style comments if possible. I don't know how that works in VS, but using a GCC compiler I can pass the -std=c89 flag to gcc to disable C++ style comments and hence making
#define WEBSITE http://example.com
possible.