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85 lines
2.7 KiB
Rust
85 lines
2.7 KiB
Rust
7 years ago
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/*
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* MIT License
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*
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* Copyright (c) 2018 Andre Richter <andre.o.richter@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#![no_std]
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#![feature(asm)]
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extern crate raspi3_glue;
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extern crate rlibc; // for memset et al.b
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extern crate volatile_register;
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const MMIO_BASE: u32 = 0x3F000000;
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mod mbox;
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mod gpio;
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mod uart;
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use core::sync::atomic::{compiler_fence, Ordering};
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fn main() {
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let mut mbox = mbox::Mbox::new();
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let uart = uart::MiniUart::new();
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// set up serial console
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uart.init();
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// get the board's unique serial number with a mailbox call
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mbox.buffer[0] = 8 * 4; // length of the message
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mbox.buffer[1] = mbox::REQUEST; // this is a request message
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mbox.buffer[2] = mbox::tag::GETSERIAL; // get serial number command
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mbox.buffer[3] = 8; // buffer size
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mbox.buffer[4] = 8;
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mbox.buffer[5] = 0; // clear output buffer
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mbox.buffer[6] = 0;
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mbox.buffer[7] = mbox::tag::LAST;
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// Insert a compiler fence that ensures that all stores to the
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// mbox buffer are finished before the GPU is signaled (which is
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// done by a store operation as well).
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compiler_fence(Ordering::SeqCst);
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// send the message to the GPU and receive answer
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let serial_avail = match mbox.call(mbox::channel::PROP) {
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Err(_) => false,
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Ok(()) => true,
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};
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uart.getc(); // Press a key first before being greeted
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uart.puts("Hello Rustacean!\n");
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if serial_avail {
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uart.puts("My serial number is: ");
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uart.hex(mbox.buffer[6]);
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uart.hex(mbox.buffer[5]);
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uart.puts("\n");
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} else {
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uart.puts("Unable to query serial!\n");
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}
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// echo everything back
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loop {
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uart.send(uart.getc());
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}
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}
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