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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.
Program for Swapping the Two Integers For example, Swapping the two value int x=4,y=6,t; t
C program to demonstrate Pointer to string: void main() { int a; char str[]="hello how are you?",*ptr_str; ptr_str=&
In general, Roman numerals can be converted mathematically by simply assigning a numerical value to each letter, according to the chart below, and calculating a total: M=1000 | D=5
farnahight of celsus
I can''t figure out how to stop the programming from hitting for the player even when they type in stand.
Identify 2 to 3 existing algorithms commonly used for object tracking. Algorithms should be in C or written in MATLAB language. Document these algorithms in flowcharts and run thes
Function fact explain how the process of recursion works in C++.In your answer assume that the function is called to calculate the factorial of 6?
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HOW THE C PROGRAM CODING IMPLEMENTED DY ITSELF UNDERSTANDING . ALSO HOW I CAN A BECOME A GOOD PROGRAMMER IN C WHAT I DO FOR GOOD PROGRAMMING ,TELL ME HOW C CODING DEVELOP DY ITSELF
THIS PROGRAM IS TO COMPARE THE TWO DATES GIVEN BY THE USER #include #include #include struct date { int dd; int mm; int yy; }; date compare(date d1,date d2) {
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