By Warren Gay
The Raspberry Pi is deceptively basic. Plug it in, boot it up, and use it as a private machine, or connect one million gizmos and modules and invent whatever new and outstanding. both manner, what it could actually truly do isn't really basic, and also you should still comprehend precisely what the Raspberry Pi is all approximately. Raspberry Pi Reference, from studying the Raspberry Pi, is the advisor you wish in your table or workbench.
Every element is roofed: from energy to reminiscence, from the CPU to operating with USB. You'll locate all of the information about operating with either stressed and instant Ethernet, SD playing cards, and the UART interface. The GPIO bankruptcy is helpful, masking strength budgeting, entry, or even small yet vital information just like the right utilization of sudo while operating with GPIO pins. You'll additionally locate information about the 1-Wire motive force, the I2C bus, and the SPI bus. if you would like to grasp whatever approximately your Raspberry Pi's undefined, you will discover it right here, in Raspberry Pi Reference.
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Additional resources for Raspberry Pi Hardware Reference
Put the calling thread to sleep (put on a wait queue) b. Unlock the mutex that was locked in step 1 Unlocking of the mutex in step 2b is necessary so that another thread can do something with the queue (hopefully, take an entry from the queue so that it is no longer full). If the mutex remained locked, no thread would be able to move. At some future point in time, another thread will do the following: 1. Lock the mutex 2. Find entries in the queue (it was currently full), and pull one item out of it 3.
Memory Mapping To gain access to physical memory under Linux, we make use of the /dev/mem character device and the mmap(2) system call. The /dev/mem node is shown here: $ ls −l /dev/mem crw−r−−−−T 1 root kmem 1, 1 Dec 31 1969 /dev/mem From the ownership information shown, it is immediately obvious that you’ll need root privileges to access it. This is sensible given that a process can cause havoc with direct access to the physical memory. Clearly, the Pi developer should exercise caution in what the applications do with it.
This indicates that the application wants both read and write access to the memorymapped region. Flags The flags argument is supplied with the value MAP_SHARED. This permits nonexclusive access to the underlying mapping. File Descriptor This argument supplies the underlying opened file to be mapped into memory. In this case, we map a region of physical ARM memory into our application by using the opened device driver node /dev/mem. Offset This last argument specifies the location in physical memory where we want to start our access.