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Assignment [Total Marks 20]
Q No. 1
Write the C Program that can be used to program the master DMA controller, description of your program is as follows.
We have supposed that an I/O device have acquired the control of channel 1of the master DMA controller and want to write the data from I/O device to RAM using demand transfer mode of DMA. You are required to program therequired DMA internal registers such that I/O device can perform the demandtransfer mode with above specifications.
In your program suppose the following things.
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any one help...............please i have no idea at alll..................
Any idea Dears!!!
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any hints plz share , so we can solve this question from old solved solution assignments..????
any idea solution please.............
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unsigned long int temp;
unsigned int i;
unsigned int count=96; // 96 bytes will be transferred
void main (void)
// As data is globally declared so DS have the segment address of data part.
temp=(unsigned long int)_DS; // Segment address (Address of Data part)
temp=temp4; // Getting absolute (base) address for data part (20 bit address)
i=*((unsigned int *)(&temp));// Lower 16 bits are stored in i of that 20 bit address
temp=temp>>16; // Higher 4 bits of temp are now in temp's least significant position.
// Higher 4 bytes will be loaded in Latch b for channel 2
outportb(0x82,*((unsigned char *)(&temp))); // 0x82 is address of Latch B for channel 2
// Lower 16 bits will be loaded serially into base register
outportb(0x04,*(((unsigned char *)(&i)))); // 0x04 is the base register for channel 2
outportb(0x04,*(((unsigned char *)(&i))+1));
// count will be loaded serially into count register as we did above
outportb(0x05,*((unsigned char *)(&count))); // 0x05 is the count register for channel 2
outportb(0x0b,0x86);// 0x0b is address of mode register
// 0x86 means Mode register is programmed for channel 2 in block transfer mode
// for write cycle and Auto initialization is off
outportb(0x08,0); // 0x08 is address of command register for slave
// 0 means transfer data between memory and I/O
outport(0x0a,2); // unmasking the channel 2
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That's not correct solution.
code complete nahi ha
tariq bhai is main VU ID add nahi ha