process for implementing interrupts in serial port,we have done normal communication by fifo mode and also defined and init the handler function with irq 4,5. but it dose not work properly, please overcome me form this nuisance.
what is the difference between memory mapped io and port mapped io. and please tell me , parallel port and serial port which memory mapping followed??
our realistic work: compatibility: sends one byte data on data port line and take the output by leds, nibble mode: sends data on upper 4bits of the data port and receive by the upper bits of the status register . … Continue reading
I have completed bidirectional DTE to DTE communication using serial port cross cable MDC: multiple data compression and decompression is also done for case 4
I have completed Serial Port Loop back mode
I am currently working on Nibble mode of parallel port and we successfully transferred bytes of information from one PC to another using delay method but, facing problems in handshaking(unable to change control bits )….i want some information about handshaking … Continue reading
sir, i have completed the parallel port driver in NIBBLE mode……But not by handshaking….(by using delay). in handshaking our status is ->control have reached from peripheral to host but we are not able to receive the control from host to … Continue reading
in Nibble mode… -> can we use a single bit in hand_shaking in the parallel port driver..? -> which bit of the control register should i use to handshake->1.strobe bit, 2.autofeed bit. Please tell me the procedure of handshaking in … Continue reading
hows inb and outb work internally? getting problem in handshaking through strobe pin in nibble mode. how can i do it?
Hi, I was working on my Driver and got this Error for a function. I checked out other blogs on Internet and it was written that it occurs when you are calling a function before declaring it. But I did … Continue reading
In my lkm,when i printed the value of “HZ”. It comes out 1000. But the actual value defined in the header #include<asm/param.h> is 100. why..?
How we can access our sucll_dev structure of specific device by a proc file system or in its function like read proc ()……….??????/
In the ioctl function at driver level…….., the switch(cmd) statement have ‘cmd’ as the argument but we can see cmd is of ‘unsigned int’ type… i want to ask how the switch function perform case matching…. switch(cmd) { case IOSQSET: … Continue reading
sir i have completed llseek,semaphor & read write with multiple quantums……..
Is there any function to reallocate memory at the kernel level in spite of kmalloc……????