C :: Pages Handling In Embedded Source
Jul 9, 2013
I'ma firmware writing, and usually use only C language (not my decision, unfortunately!).In many application we've only a text display (2 rows 16 columns ascii char, or 4x20 or something else). But the question can be used also for semi graphics panel and so on.
I'm looking for an example / library / sourcecode to handling all the pages in the project. When the program start you've a 1st page (wth info abt release, hallo screen and so on), then with a arrows buttons you can navigate throught many pages. Some of these can be called by SW (or HW) events. (Button, alarm, end of job ...) In abt 20 year of experience3 I?ve seen many type of different code.
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Apr 16, 2014
Data handling for a UAV project I am trying. My background is in Microcontrollers but I have never had exposure to "sound" programming practice...
I have got 2 microcontrollers to drive a UAV craft I've made. One "firmware" micro collects all the sensor data and then passes it to the other "application" micro for control processing. Once decisions have been made this is sent back to the "firmware" micro so that actions are taken.
So in essence I am sharing a raw data chunk periodically between the 2 processors that has outputs and feedback data. For the moment this is captured as one big buffer array on either micro after receiving. For easier structure I thought of bouncing this buffer that contains all sensor information and control variables between the 2 processors (visualize a ping pong game with all the possible variables from both micros - bandwidth between the micros is not a limitation) There are quite a few modules that want to access information from this buffer and write control actions back to it.
I was thinking of constructing a struct on both micros to access this "raw data" from the buffer and set it up with variable names so that it is easier for functions to read info and write controls back.
But this would mean that the data is accessible to every function, and there is the fear that some functions will write to the input data or write to control variables that they should not have access to. I also need to reduce memory copies and the like due to limited memory on each micro.
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Dec 16, 2014
I'm not new to C++ programming but I'm not an expert either. I'm using Borland C++ builder 5. I know it's extremely antiquated, but I have no choice right now. Writing a database reporting program, using third party report building components (ACE) which has it's own print dialogs built in. However, in this report we cannot use the build in dialogs and have to use a standard TPrintDialog. When the TPrintDialog is executed and you click print on the dialog, only one page is sent to the printer.
Here's some code:
// The dataset for the report is executed prior to this code and does not //change.
Once the data is gathered, the report can be run as often as you like // and the same data will appear in the report.
Code:
if (cbxShowForm->Checked){
OverlayBand->Visible = true;
AllowPrint = false;
SctReport1->Prompt = false;// disables ACE Reporter Print Dialog
SctReport2->Prompt = false;
[Code] ....
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Mar 8, 2014
I wanted to remove previous tappages from tab control and add new tab pages on button click, but previous tab pages are not getting removed
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
[code]....
Update:i have added the below code on button click and i am able to create a new tabpages
this.Controls.Remove(tc);
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Oct 24, 2014
For now the app creates a new DateTime property which is binded to a label and shows the user the current time. Eventually I want to have the ability to select the timezone you are in, change font/background colors/etc etc... But that is all in time. My current step that I am trying to implement is having a button click (Binded to an event method) change screens. I find it hard to explain in words, but I would like the same Window to be used, just have different functions on the other when the button is clicked. So for example...
The only way I have found to do this so far is to create a whole new form or create tabs. While those are all good and have their place. I know that I need to start breaking up my code into classes, I am developing a bad habit throwing everything into the MainWindow Class...
Here is the code if needed:
XAML:
<Window x:Class="ClockApp.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
x:Name="MyWindow"
Title="Alarm Clock App" Height="180" Width="360" Visibility="Visible" ResizeMode="NoResize" WindowStyle="ToolWindow">
[Code] ....
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Feb 11, 2014
I created a richtextbox to input the text that I want to print, the command for printing which is the button and instead of printdialog box((PrintDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)) to be display, I created combobox which will display the available printers and then print.
Like this code bellow .
To get the available printers:
foreach (String printer in PrinterSettings.InstalledPrinters)
{
cbox.Items.Add(printer.ToString());
}
And the button for printing :
PrintDocument1.PrinterSettings.PrinterName = cbox.SelectedItem.ToString();
PrintDocument1.Print();
Now what I want to do is I will add some textbox to input the page number to be printed . For example the current pages in the richtextbox are 12pages when I'm going to run the program I will input in the textbox the page/s that I want like (3-7pages). How could it be ?
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Mar 16, 2014
I have function like this:
void OpenURL(LPWSTR url) {
//Notice! 6 parameters, not 7
ShellExecute(NULL, L"open", url, NULL, NULL, NULL);
}
If I then use this function like this:
OpenURL(L"http://www.google.com/");
OpenURL(L"http://bytes.com/");
OpenURL(L"http://www.yahoo.com/");
sometimes only the first web page is opened, but sometimes all of them. What I should do so that all the web pages opened with OpenURL-function are always opened? Also, better ways to open web pages are very welcome. I use Visual Studio 2008 Express and Visual Studio 2013 Express.
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Feb 17, 2014
I am working on writing a game that progresses from one "page" to the next. However, with the knowledge and experience I have right now I am only able to hardcode the "Pages" into the source code. I would like to learn how to put the pages into another file "default.pages" and have the program read the file and input the information into itself after I have compiled it. Then, if I change the pages file I simply have to restart the program instead of recompiling all of it. Someone said I should use XML and input it into an object and use that object, but I'm not sure how to do that yet.
I have 3 files right now:
main.cpp, pages.cpp, and pages.h.
//MAIN//
#include <iostream>
#include <string>
#include <fstream>
#include "pages.h"
using namespace std;
const Page gamePages[] = {};
[Code] ....
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Oct 21, 2012
How can I calculate the total of pages for all file(pdf,word,excel,txt...) types in a directory with c#?
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Oct 14, 2014
I have 10 or so .sql scripts (the number is likely to rise) which are required to be kept with a C# application.
For the most part the embedded resources seem to work fine , however I require a way in which to guarantee the ordering in which the files are run.
What I do currently:
Retrieve the details of the embedded resources using : Assembly.GetManifestResourceNames()
(and a bit of linq to filter based upon my requirements) which I pass to a list, I then later on use the list to grab the physical resource when its needed.
The files are named such as:
1_ScriptDescription.sql
2_ScriptDescription.sql
3_ScriptDescription.sql
10_ScriptDescription.sql <--- Here's my problem! This will come after 1_ScriptDescription.sql
Ideally I need a way in which to order the list or some kind of ordering when I pull from
Assembly.GetManifestResourceNames()
But I'm not really sure of a practical way to do this, I did consider manipulating the string .....
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Jan 30, 2013
I am trying to include library paths in VS 2012 through the new property pages.I downloaded and installed mpich2-64 bit libraries under "C:Program FilesMPICH2include" and set the include path in Microsoft.cpp.x64.user property file so the path now looks like
Code:
"$(VCInstallDir)include;$(VCInstallDir)atlmfcinclude;$(WindowsSDK_IncludePath);C:Program FilesMPICH2include;"
But somehow it fails to find the files.
Code:
fatal error C1083: Cannot open include file: 'mpi.h': No such file or directory
The file is definitely there, so what could be the problem ?
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Oct 13, 2013
What I want to do is abstract and model a device (more specifically in this case, an IMU) in an embedded system.
Now, there are a couple of gotchas:
- It is basically a framework, which means that it should work with any device, any platform and any bus.
- It is an embedded system, so power consumption and memory consumption must be reduced. It is not a PC.
- It cannot be too complex, because I fear that will just make people scrap it and rewrite it from scratch :P
- It should aim for as little code as possible to write the whole model, of course. Adding 100 lines of code for each register would be a bummer.
That said, I must also model the current system, which means that the current platform, the current bus (which is I2C) and the specific IMU model (I have a datasheet).
So the model I am thinking of currently is this:
First, I have a platform. It will know what bus a device is connected on and contains the buses (or specifically, the instances of the buses). It consists of a specific class for each platform and a base. Here are the two I have now:
Code:
namespace Sensors
{
template<typename Platform_t> class GPS;
}
namespace Platforms
{
class RaspberryPi: public PlatformBase
[Code]....
Currently I am making the assumption that all platforms will have an I2c bus and UART bus, but I'm not sure about that. We have only one platform ATM, though, so for now this holds. I'm guessing I might have to move it to the specific platforms later and get rid of PlatformBase.GetI2CBus is a problematic one related to registers, but I'll get back to that.
UART is simple to model since it's just a block read and write, so:
Code:
namespace Buses
{
class UART
{
public:
UART(const std::string& UARTPath): m_Open(false), m_PathToUART(UARTPath) {}
[Code]....
I'm probably going to handle all errors through exceptions. So if I can't open the UART bus, I'll throw an exception.
The I2C bus is a problem. I have a model which deals with it on a register-based level, but ideally I'd like to be able to model and use the devices on the I2C bus on a flag-based level (ie, I have names for each individual flag in the registers which I can read or write to directly instead of writing a hexadecimal value directly to each register).
Here is code:
Code:
namespace Buses {
template<unsigned int Id>
class I2CDevice {
public:
I2CDevice(I2C& Bus): m_Bus(Bus) {}
template<typename T>
[Code]....
So I2CDevice does some checks to see that the data to write to a register is either 8 or 16 bits. It does not check that the size to write matches the register's size, but another class does not.
The idea is also that it checks which device is currently active on the bus, and if it's not the current I2CDevice, then it simply selects that before attempting to read or write (the Open call).
This is not meant for multi-threaded environments. Yet, anyway.
The Impl2::Read/Write just dispatches the call so it calls the correct function for writing and reading the correct size, depending on the size of the data.
This is all well and good, but I2C works with registers, so of course I want a class to model a register which I can read and write to directly. It must tie into the bus class since the bus class is the one that abstracts reads and writes on the bus.
The register class looks like:
Code:
template<unsigned int Bits, unsigned int RegisterId, typename Bus_t>
class Register {
public:
typedef typename Impl::RegisterBase<Bits>::Storage_t Storage_t;
static_assert(!std::is_same<Bus_t, Buses::UART>::value, "Cannot read and write registers on the UART bus.");
static_assert(Bits == 8 || Bits == 16 || Bits == 32 || Bits == 64, "Number of bits must be 8, 16, 32 or 64.");
auto Write(Storage_t Data) -> void
[Code]....
I think this explains itself, except for the Regs struct, which is an experiment by me to enable myself to access registers via Regs.Config, etc.
What is missing is the ability to access and read/write the individual bits inside the registers. I am thinking a two-way access, where you can write to individual bits, but must call .Write() to commit the write to the register for efficiency.
I haven't actually written this. I don't know a good way ATM. I don't want to add a lot of variables and a write function because that would use 1 byte for every bit which is unacceptable.
I don't want to add a lot of code to make it work, either. A good get/set class would be nice, but I can't see that working. The register must store all state and any subsequent classes must not store any state or overhead will increase.
Finally, yes, I know a lot is incomplete and untested. It probably won't even compile. But that is for later. First is finishing the model.
It would be nice if things such as the platform and buses could be made static because there will only be one instance at any time, and that would save overhead if I don't have to store objects or references to them, but I haven't figured out how to achieve this.
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Jun 6, 2014
I am trying to write a C code with embedded MySQL with server and client options. I am trying to important a csv data file for MySQL server and client.
I saw on internet like: LOAD DATA LOCAL INFILE 'data.csv' INTO TABLE test FIELDS TERMINATED BY',' LINES TERMINTED BY' ';
But I think that line is for SQL workspace. How to write in C format?
Code:
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include "/usr/include/mysql/mysql.h"
MYSQL *mysql;
MYSQL_RES *results;
MYSQL_ROW record;
static char *server_options[] = { "data.csv", "--defaults-file=my.cnf" };
int num_elements = sizeof(server_options)/ sizeof(char *);
[Code] ......
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Sep 17, 2013
My earlier attempt to get an answer didn't work, so i want to make my question more straight forward.
Is it possible to create a C++ DLL with Web Browser like CDHtmlDialog embedded in it?
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Dec 1, 2012
i am doing an embedded project on avr microcontroller ATmega8515.actually my project is smart card based electricity billing using UART interfacing..so in this module HEX to ASCII conversion is not possible for me...
how to convert from hex to ascii.
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Apr 19, 2014
I have the following complete code in c++
Code:
void GetMapData () {
MapPair NewMap;
string TempString;
BOOL SkipReadLine = FALSE;
//------
char buffer[MAX_PATH];
std::fstream File;
[code].....
The problem is that I do not want to have an external MapData.txt, rather I access it through a embedded text resource, which in this case I have no knowledge on doing so.
I have the following snippet which demonstrates to my knowledge on how to access a text resource; however, I do not know hot to modify the code above to implant this, but to still have the same functionality as the original code above.
Code:
HRSRC hRes = FindResource(GetModuleHandle(NULL), MAKEINTRESOURCE(IDR_TEXT1), _T("TEXT"));
DWORD dwSize = SizeofResource(GetModuleHandle(NULL), hRes);
HGLOBAL hGlob = LoadResource(GetModuleHandle(NULL), hRes);
const BYTE* pData = reinterpret_cast<const BYTE*>(::LockResource(hGlob));
note that I am compiling with a MBCS.
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Jun 17, 2014
The following code is an example of how task are created with micro cos III in c. I am trying to figure how to create similliar code in C++. My problem is how do I instantiate objects and how to use member functions to represent task. Within the create task routine the address of function is passed as argument. How do I do this in C++? Will I need more than one class? New to embedded C++.
/*!
* @brief LED Flasher Task
*/
void
led5_task (void * p_arg)
{
OS_ERR err;
(void)p_arg; // NOTE: Silence compiler warning about unused param.
[Code]...
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Sep 19, 2014
This project is for an embedded micro controller. In the project i wrote a class that generically services uarts. then i declare 6 objects of that class and hand them configurations for each specific uart.
internally all the objects have a send buffer of data that is still to be sent that gets populated by the object member function.
how can i make an array of function pointers that can point to the same member but of six different objects.
for example (not a working one)
class uart {
private:
struct myData {
unsigned char data[20]
int head
int tail
int count;
[Code] ....
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Nov 13, 2013
I have an SDI app created with VC2012. Main view is a CFormView and it's the parent to four embedded dialogs. All four dialogs have title bars. On three of them, the title bars looks as I'd expect. Normal size, text left justified. On the fourth, the title bar is noticeably thicker and the text is centered. All styles are the same as far as I can tell. The main difference is the one that's acting up has a browser control on it, the others just standard controls. It looks normal on Windows 7.
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Mar 13, 2013
Is there any standard USB protocol which i can follow to send data to my embedded board(and vice versa). I have no clue on USB programming using c,is there any example code i could follow,
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Mar 27, 2014
I need to insert my thesaurus words .txt to my c program applying BST. But I am not sure how.
Here are my file: awwwwwwww.txtthes.c
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May 4, 2014
I am making a game and want to make an updater that grabs the source code from a page on the web. Can this use things that are available to all platforms? It could just be something that grabs the text from the page and executing it (maybe using something like Python's exec() command ?) BTW I'm using mac
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Mar 6, 2015
I am accepting the word from user and arranging it in ascending order like in dictionary in a file . I am doing this by comparing the user entered word from existing word in the file . All the word which is smaller then user entered word is copied to another file "temp.txt" , then the user word is printed and then the remaining word ( which are larger) from "abc.txt" to "temp.txt" . But program close as soon as i enter the second word
Code:
#include<stdio.h>
#include<string.h>
main() {
FILE *fp,*ft ;
fp = fopen("abc.txt","r+");
ft = fopen("temp.txt","r+");
[Code]....
Both file are already created before /
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Dec 29, 2013
I got this issue to tackle which consists of using an FIR LPF filter to filter a wav file using C programming.
Till now I managed to tackle the filter part following this link: Implementation of FIR Filtering in C (Part 1) | Shawn's DSP Tutorials (I have my own filter co-efficients which have been produced using FDAtool on MATLAB and some other minor changes have been applied to match my requirements)
Now, the link shown does not compensate for files having a header. I have three wav files which need to be filtered. Thus I need to first extract the data from the header .. this was done using RIFFpad. Now that I have the data
Info from RIFFpad:
fmt -
Offset=20
ID=fmt
[Code].....
I've got this hint to start with: Each audio datasample inside the wav_files can be made up of a number of bytes and these bytes arestored in the little-endian order. Inside your program you have to change this to a big-endian order.
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Apr 8, 2014
I'm given a project in college to use trees(AVL tree, to be specific) and file handling(not very conversant with it). But I'm not able to relate the two.
I only know that files can be used to store data. But in what way can trees and file handling be connected? I know how to implement trees but how to store it as such in files?
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Oct 14, 2014
I want to start developing Android apps in C++, but I do not know what I could use to compile the source code into an apk. I know that C++ is probably not the best choice for Android development, but I already know it and I do not want to learn Java.
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