The BCM2835 is the name of the chipset the Raspberry Pi model 1 uses, and most of the information is good for the model 2 and 3.
#Memory mapped io how to
Another common register is a write register, where anything written in it gets sent off to the hardware.įiguring out where all the peripherals are, what registers they have, and how to use them can mostly be found in the BCM2835 ARM peripheral manual.
For example, it is quite common for one at least one register to be a control register, where each bit in the register corresponds to a certain behavior that the hardware should have. These registers are at predefined offsets from the peripheral’s base address. The Peripheral Base Address, which starts at 0x20000000 on the Raspberry Pi model 1, and at 0x0x3F000000 on the models 2 and 3.Ī Register is a 4 byte piece of memory through that a peripheral can read from or write to. All peripherals can be described by an offset from All interactions with hardware on the Raspberry Pi occur using MMIO.Ī Peripheral is a hardware device with a specific address in memory that it writes data to and/or reads data from. However, when you look at the same thing from the viewpoint of the devices, you have the reverse, and the physical memory address 0 actually shows up as address 2 GB for any IO master. Cluster Comput.Memory Mapped IO or MMIO is the process of interacting with hardware devices by by reading from and writing to predefined memory addresses. 0-2 GB 'real memory' 2 GB-3 GB 'system IO' (inb/out and similar accesses on x86) 3 GB-4 GB 'IO memory' (shared memory over the IO bus) Now, that looks simple enough.
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