This is a library for accessing memory-mapped I/O.
It assists register access using UIO(User space I/O) and bare-metal access with no_std.
It also assists access using u-dma-buf.
mmio access in bare-metal programming can be written as follows.
rust
type RegisterWordSize = u64;
let mmio_acc = MmioAccessor::<RegisterWordSize>::new(0xffff0000, 0x10000);
mmio_acc.write_mem8 (0x00, 0x12); // addr : 0xffff0000
mmio_acc.write_mem16(0x02, 0x1234); // addr : 0xffff0002
mmio_acc.write_reg32(0x10, 0x12345678); // addr : 0xffff0080 <= 0x10 * size_of<RegisterWordSize>()
mmio_acc.read_reg32(0x10); // addr : 0xffff0080 <= 0x10 * size_of<RegisterWordSize>()
UIO access in Linux programming can be written as follows.
rust
type RegisterWordSize = usize;
let uio_num = 1; // ex.) /dev/uio1
let uio_acc = MmioAccessor::<RegisterWordSize>::new(uio_num);
uio_acc.set_irq_enable(true);
uio_acc.write_reg32(0x00, 0x1);
uio_acc.wait_irq();
u-dma-buf access in Linux programming can be written as follows.
rust
let udmabuf_num = 4; // ex.) /dev/udmabuf4
let udmabuf_acc = UdmabufAccessor::<usize>::new(udmabuf_num, false).unwrap();
println!("udmabuf4 phys addr : 0x{:x}", udmabuf_acc.phys_addr());
println!("udmabuf4 size : 0x{:x}", udmabuf_acc.size());
udmabuf_acc.write_mem32(0x00, 0x1234);