How can I access physical devices under On Time RTOS-32 (e.g., I/O ports, memory mapped registers, physical memory, DMA buffers, etc)?
On Time RTOS-32 offers functions to read from and write to I/O ports. All the compiler’s port I/O functions are supported (e.g., inportb(), inp(), etc). None of the restrictions of Windows apply. Your application has full control over the hardware. The same is true for the address space. Since physical and logical addresses are identical, you can load absolute values into pointers to directly access memory mapped devices, DMA buffers, etc. Such memory regions can be defined in the locate process to allow access even when paging is enabled. Programming the hardware under On Time RTOS-32 is very simple.
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