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Talking to IO boards inside a computer or microcontroller depends upon the principles used by the microprocessor to address physical devices. On Motorola systems all devices connected to the processor local bus are memory mapped. Therefore it is fairly easier to address by means of a pointer the IO device, since it is just like RAM. In the case of Intel devices, the IO is not memory mapped, it is IO mapped. This causes a minor problem is accessing such devices, since the processor has to use IN, OUT commands and the address, therefore a simple pointer will not do. A non-ANSI function exists on PC's called 'portoutb' and 'portinb' these are used to input and output a byte of data (char) to an IO address (int). The syntax depends upon the compiler used by usually consists of outportb(address,data); data = inportb(address); Care should be taken when porting code from an Intel platform to a Motorola platform since these functions are not standard ANSI and will need to converted for the Motorola Platform. Below is shown an example for a 8255 IO board configured at a base address 0x2b4 #include stdio.h #include dos.h void main() { Date: 26th August 1992 Version 1.0 Function : Reads port A and display it on the screen and portb,c Modifications: Non Standard non portable code PC only */ int CardAddress = 0x2b0, BaseAddress, Port_a; int Port_b, Port_c, ControlRegister; unsigned char ControlWord = 0x90, InputValue; BaseAddress = CardAddress + 4; Port_a = BaseAddress; Port_b = BaseAddress + 1; Port_c = BaseAddress + 2; ControlRegister = BaseAddress + 3; ControlWord = 0x90; outportb(ControlRegister, ControlWord); while (1) { InputValue = inportb(Port_a); outportb(Port_b, InputValue); outportb(Port_c, InputValue); printf("Read from A = %x\n", InputValue); } } Despite these additions NON-ANSI functions they are only DOS commands and hence using Windows NT you will need to write a windows driver, for this you will need C++ and a few books on Windows.
Write a C program to calculate the output Y for a given value of X for the following formula Y=X 2 + 2X +3 #include stdio.h void main() { char promt; float y,x
">http://www.ee.nmt.edu/~erives/289_F12/EE289_Takehome_2.pdf http://www.ee.nmt.edu/~erives/289_F12/Takehome2_maze.GIF
a c program to find the volume of sphere
Project Description: I have software written with VB that i helped design, but now the original author died,(Neil Tromp), and the software ended up in the hands of someone else!
C Program for Palindrome Normal 0 false false false EN-US X-NONE X-NONE MicrosoftInternetExplorer4
Define Advantages of Multi File Program? The main merits of spreading a program across several files are: • Teams of programmers able to work on programs. Every programmer w
Is it legal for a member function to say delete this? A: As long as you're cautious, it's OK for an object to delete this. Here's how I define "cautious": You have to be a
to find the area under the curve y = f(x) between x = a and x = b
A string S is said to be "Super ASCII", if it contains the character frequency equal to their ascii values. String will contain only lower case alphabets (''a''-''z'') and the asci
2 flowcharts, pseudocode for each (at least 4 algorithms), and code for either a stack or a queuestion..
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