{"id":45496,"date":"2022-12-07T04:15:26","date_gmt":"2023-03-25T19:43:30","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/45496-2\/"},"modified":"2024-04-29T04:05:32","modified_gmt":"2024-04-28T20:05:32","slug":"45496-2","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/45496-2\/","title":{"rendered":""},"content":{"rendered":"<h1>Rust\u3067\u7d44\u307f\u8fbc\u307f L\u30c1\u30ab<\/h1>\n<p>Rust\u3067Raspberry Pi4\u3092\u5bfe\u8c61\u306b\u7d44\u307f\u8fbc\u307f\u306e\u958b\u767a\u74b0\u5883\u3092\u6574\u3048\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h2>\u74b0\u5883\u69cb\u7bc9<\/h2>\n<ul class=\"post-ul\">\n<li style=\"list-style-type: none;\">\n<ul class=\"post-ul\">cargo-binutils\u306e\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<ul class=\"post-ul\">toolchain\u306e\u8ffd\u52a0<\/ul>\n<h3>cargo-binutils\u306e\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb<\/h3>\n<p>rust-lld \u3084\u3001rust-objcopy, rust-objdump\u3068\u3044\u3063\u305f\u7d44\u307f\u8fbc\u307f\u306b\u5fc5\u9808\u306e\u30b3\u30de\u30f3\u30c9\u304c\u542b\u307e\u308c\u3066\u3044\u307e\u3059\u3002\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb\u3059\u308b\u306b\u306f<\/p>\n<pre class=\"post-pre\"><code><span class=\"gp\">$<\/span> cargo <span class=\"nb\">install <\/span>cargo-binutils\r\n<span class=\"gp\">$<\/span> rustup component add llvm-tools-preview\r\n<\/code><\/pre>\n<p>\u3092\u5b9f\u884c\u3057\u305f\u3089\u3044\u3044\u3067\u3059\u3002\u3053\u3053\u306b\u8a73\u7d30\u8f09\u3063\u3066\u307e\u3059\u3002<\/p>\n<h3>toolchain\u306e\u8ffd\u52a0<\/h3>\n<p>\u4eca\u56deRaspberry Pi4\u3067\u4f7f\u3046toolchain\u306faarch64-unknown-none\u3067\u3059\u3002target-triple\u306b\u3064\u3044\u3066\u306f\u3053\u3053\u3092\u53c2\u7167\u304f\u3060\u3055\u3044\u3002toolchain\u306e\u8ffd\u52a0\u306f<\/p>\n<pre class=\"post-pre\"><code><span class=\"gp\">rustup target add &lt;target-triple&gt;<\/span>\r\n<\/code><\/pre>\n<p>\u3067\u884c\u3048\u307e\u3059\u3002\u4eca\u56de\u306f rustup target add aarch64-unknown-none \u3067\u3059\u3002<\/p>\n<p>\u74b0\u5883\u69cb\u7bc9\u306f\u4ee5\u4e0a\u3067\u3059\u3002stable \u3092\u4f7f\u3063\u3066\u308b\u65b9\u306fnightly\u3078\u5909\u66f4\u3092\u3002\u3002\u3002<\/p>\n<h2>L\u30c1\u30ab<\/h2>\n<p>\u74b0\u5883\u3082\u6574\u3063\u305f\u3068\u3053\u308d\u3067\u3001\u65e9\u901fL\u30c1\u30ab\u30b3\u30fc\u30c9\u66f8\u3044\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<h3>Makefile\u306e\u4f5c\u6210<\/h3>\n<p>\u5fc5\u9808\u3067\u306f\u306a\u3044\u306e\u3067\u3059\u304c\u3001\u30b3\u30de\u30f3\u30c9\u304c\u9577\u304f\u9762\u5012\u306a\u306e\u3067\u3001\u4f5c\u6210\u3092\u304a\u3059\u3059\u3081\u3057\u307e\u3059\u3002cargo new blink_rust\u3092\u5b9f\u884c\u3057\u305f\u5f8c\u3001\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u79fb\u52d5\u3057\u3066\u4ee5\u4e0b\u306eMakefile\u3092\u4f5c\u6210\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"c\">##project info#############################################################\r\n<\/span><span class=\"nv\">PROJECT<\/span><span class=\"o\">=<\/span>blink_rust\r\n<span class=\"nv\">TARGET<\/span><span class=\"o\">=<\/span>aarch64-unknown-none\r\n<span class=\"nv\">ver<\/span> <span class=\"o\">?=<\/span> debug\r\n<span class=\"nv\">QEMU_DIST<\/span><span class=\"o\">=<\/span>stdio\r\n\r\n<span class=\"c\">##files####################################################################\r\n<\/span><span class=\"nv\">ELF<\/span><span class=\"o\">=<\/span>target\/<span class=\"nv\">$(TARGET)<\/span>\/<span class=\"nv\">$(ver)<\/span>\/<span class=\"nv\">$(PROJECT)<\/span>\r\n<span class=\"nv\">IMG<\/span><span class=\"o\">=<\/span>kernel8.img\r\n<span class=\"nv\">DUMP<\/span><span class=\"o\">=<\/span><span class=\"nv\">$(PROJECT)<\/span>.dump\r\n<span class=\"nv\">SRCS<\/span><span class=\"o\">=<\/span><span class=\"nf\">$(<\/span><span class=\"nb\">wildcard<\/span> src\/<span class=\"k\">*<\/span>.rs<span class=\"nf\">)<\/span>\r\n\r\n<span class=\"c\">###########################################################################\r\n<\/span><span class=\"nl\">all<\/span><span class=\"o\">:<\/span> <span class=\"nf\">build $(DUMP) <\/span>\r\n<span class=\"nl\">build <\/span><span class=\"o\">:<\/span> <span class=\"nf\">$(IMG)<\/span>\r\n<span class=\"nl\">dump<\/span><span class=\"o\">:<\/span> <span class=\"nf\">$(DUMP)<\/span>\r\n        <span class=\"err\">less<\/span> <span class=\"err\">$&lt;<\/span>\r\n<span class=\"nl\">check<\/span><span class=\"o\">:<\/span> <span class=\"nf\">$(SRC)<\/span>\r\n        <span class=\"err\">cargo<\/span> <span class=\"err\">check<\/span>\r\n\r\n<span class=\"c\">###########################################################################\r\n<\/span><span class=\"nl\">$(ELF)<\/span><span class=\"o\">:<\/span> <span class=\"nf\">$(SRCS)<\/span>\r\n        <span class=\"err\">cargo<\/span> <span class=\"err\">rustc<\/span>\r\n\r\n<span class=\"nl\">$(IMG)<\/span><span class=\"o\">:<\/span> <span class=\"nf\">$(ELF)<\/span>\r\n        <span class=\"err\">rust-objcopy<\/span> <span class=\"err\">-O<\/span> <span class=\"err\">binary<\/span> <span class=\"err\">$&lt;<\/span> <span class=\"err\">$@<\/span>\r\n\r\n<span class=\"nl\">clean<\/span><span class=\"o\">:<\/span>\r\n        <span class=\"err\">$(RM)<\/span> <span class=\"err\">src\/*~<\/span> <span class=\"err\">*~<\/span>\r\n\r\n<span class=\"nl\">distclean<\/span><span class=\"o\">:<\/span> <span class=\"nf\">clean<\/span>\r\n        <span class=\"err\">cargo<\/span> <span class=\"err\">clean<\/span>\r\n        <span class=\"err\">$(RM)<\/span> <span class=\"err\">*.lock<\/span> <span class=\"err\">$(DUMP)<\/span> <span class=\"err\">$(DOC_LN)<\/span> <span class=\"err\">$(IMG)<\/span>\r\n\r\n\r\n<span class=\"nl\">$(DUMP)<\/span><span class=\"o\">:<\/span> <span class=\"nf\">$(ELF)<\/span>\r\n        <span class=\"err\">@date<\/span> <span class=\"err\">&gt;<\/span> <span class=\"err\">$(PROJECT).dump<\/span>\r\n        <span class=\"err\">rust-objdump<\/span> <span class=\"err\">-d<\/span> <span class=\"err\">$&lt;<\/span> <span class=\"err\">&gt;&gt;<\/span> <span class=\"err\">$(PROJECT).dump<\/span>\r\n<\/code><\/pre>\n<h3>\u30ab\u30fc\u30cd\u30eb\u30ed\u30fc\u30c9\u306e\u305f\u3081\u306e\u30a2\u30bb\u30f3\u30d6\u30ea\u30b3\u30fc\u30c9\u3068linker script<\/h3>\n<p>Makefile\u4f5c\u6210\u3092\u7d42\u3048\u305f\u3089link\u7528\u306e\u30d5\u30a1\u30a4\u30eb\u3068\u30d6\u30fc\u30c8\u7528\u306e\u30a2\u30bb\u30f3\u30d6\u30ea\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002\u3053\u3053\u3092\u53c2\u8003\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u30a2\u30bb\u30f3\u30d6\u30ea\u306b\u3064\u3044\u3066\u306f\u3001Rust\u306e\u30b3\u30fc\u30c9\u5185\u3067\u3001bss\u30bb\u30af\u30b7\u30e7\u30f3\u306e\u521d\u671f\u5316\u3092\u884c\u3063\u3066\u3044\u308b\u305f\u3081\u3001\u305d\u308c\u306b\u5f53\u305f\u308b\u90e8\u5206\u3092\u524a\u9664\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code>\/* cite from https:\/\/isometimes.github.io\/rpi4-osdev\/part1-bootstrapping *\/\r\nSECTIONS\r\n{\r\n    . = 0x80000;     \/* Kernel load address for AArch64 *\/\r\n    .text : { KEEP(*(.text.boot)) *(.text .text.* .gnu.linkonce.t*) }\r\n    .rodata : { *(.rodata .rodata.* .gnu.linkonce.r*) }\r\n    PROVIDE(_data = .);\r\n    .data : { *(.data .data.* .gnu.linkonce.d*) }\r\n    .bss (NOLOAD) : {\r\n        . = ALIGN(16);\r\n        __bss_start = .;\r\n        *(.bss .bss.*)\r\n        *(COMMON)\r\n        __bss_end = .;\r\n    }\r\n    _end = .;\r\n\r\n   \/DISCARD\/ : { *(.comment) *(.gnu*) *(.note*) *(.eh_frame*) }\r\n}\r\n__bss_size = (__bss_end - __bss_start)&gt;&gt;3;\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code>    .section \".text.boot\"\r\n    .global _start\r\n_start:\r\n    mrs x1, mpidr_el1\r\n    and x1, x1, #3\r\n    cbz x1, 2f\r\n1:\r\n    wfe\r\n    b 1b\r\n2:  \/\/ setting stack pointer\r\n    ldr x1, =_start\r\n    mov sp, x1\r\n    \/\/ load _rust_start \r\n    bl _rust_start\r\n    b 1b\r\n<\/code><\/pre>\n<h3>Rust\u30b3\u30fc\u30c9<\/h3>\n<p>\u3053\u3053\u307e\u3067\u4f5c\u6210\u3057\u305f\u3089Rust\u306e\u30b3\u30fc\u30c9\u3092\u4f5c\u6210\u3057\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"nd\">#![no_std]<\/span>\r\n<span class=\"nd\">#![no_main]<\/span>\r\n<span class=\"nd\">#![feature(asm,<\/span> <span class=\"nd\">global_asm)]<\/span>\r\n\r\n<span class=\"k\">mod<\/span> <span class=\"n\">boot<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">mod<\/span> <span class=\"n\">gpio<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">use<\/span> <span class=\"nn\">gpio<\/span><span class=\"p\">::<\/span><span class=\"o\">*<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"k\">const<\/span> <span class=\"n\">MMIO_BASE<\/span><span class=\"p\">:<\/span> <span class=\"nb\">usize<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">0xFE00_0000<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"c\">\/\/\/ # This is the function loaded by _rust_start in boot.rs<\/span>\r\n<span class=\"c\">\/\/\/ see the code in boot.rs<\/span>\r\n<span class=\"k\">fn<\/span> <span class=\"nf\">main<\/span><span class=\"p\">()<\/span> <span class=\"k\">-&gt;<\/span> <span class=\"o\">!<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"c\">\/\/ set gpio pin<\/span>\r\n    <span class=\"k\">let<\/span> <span class=\"k\">mut<\/span> <span class=\"n\">led<\/span> <span class=\"o\">=<\/span> <span class=\"nn\">gpio<\/span><span class=\"p\">::<\/span><span class=\"nn\">GpioPin<\/span><span class=\"p\">::<\/span><span class=\"nf\">new<\/span><span class=\"p\">(<\/span><span class=\"mi\">16<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"n\">led<\/span><span class=\"nf\">.set_function<\/span><span class=\"p\">(<\/span><span class=\"nn\">GpioFunction<\/span><span class=\"p\">::<\/span><span class=\"n\">OUTPUT<\/span><span class=\"p\">);<\/span>\r\n\r\n    <span class=\"k\">let<\/span> <span class=\"k\">mut<\/span> <span class=\"n\">dur<\/span><span class=\"p\">;<\/span>\r\n    <span class=\"k\">loop<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">dur<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">30000<\/span><span class=\"p\">;<\/span>\r\n        <span class=\"k\">while<\/span> <span class=\"n\">dur<\/span> <span class=\"o\">&gt;<\/span> <span class=\"mi\">5000<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"n\">led<\/span><span class=\"nf\">.set_high<\/span><span class=\"p\">();<\/span>\r\n            <span class=\"nf\">busy_wait<\/span><span class=\"p\">(<\/span><span class=\"n\">dur<\/span><span class=\"p\">);<\/span>\r\n            <span class=\"n\">led<\/span><span class=\"nf\">.set_low<\/span><span class=\"p\">();<\/span>\r\n            <span class=\"nf\">busy_wait<\/span><span class=\"p\">(<\/span><span class=\"n\">dur<\/span><span class=\"p\">);<\/span>\r\n            <span class=\"n\">dur<\/span> <span class=\"o\">-=<\/span> <span class=\"mi\">500<\/span><span class=\"p\">;<\/span>\r\n        <span class=\"p\">}<\/span>\r\n        <span class=\"n\">led<\/span><span class=\"nf\">.set_low<\/span><span class=\"p\">();<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"c\">\/\/\/ busy wait function<\/span>\r\n<span class=\"k\">fn<\/span> <span class=\"nf\">busy_wait<\/span><span class=\"p\">(<\/span><span class=\"n\">time<\/span><span class=\"p\">:<\/span> <span class=\"nb\">usize<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">for<\/span> <span class=\"mi\">_<\/span> <span class=\"n\">in<\/span> <span class=\"mi\">0<\/span><span class=\"o\">..<\/span><span class=\"n\">time<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"k\">unsafe<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"nd\">asm!<\/span><span class=\"p\">(<\/span><span class=\"s\">\"\"<\/span><span class=\"p\">);<\/span>\r\n        <span class=\"p\">}<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<span class=\"nd\">#[panic_handler]<\/span>\r\n<span class=\"k\">fn<\/span> <span class=\"nf\">panic<\/span><span class=\"p\">(<\/span><span class=\"mi\">_<\/span><span class=\"n\">info<\/span><span class=\"p\">:<\/span> <span class=\"o\">&amp;<\/span><span class=\"nn\">core<\/span><span class=\"p\">::<\/span><span class=\"nn\">panic<\/span><span class=\"p\">::<\/span><span class=\"n\">PanicInfo<\/span><span class=\"p\">)<\/span> <span class=\"k\">-&gt;<\/span> <span class=\"o\">!<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">loop<\/span> <span class=\"p\">{}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"k\">use<\/span> <span class=\"nn\">core<\/span><span class=\"p\">::<\/span><span class=\"nn\">convert<\/span><span class=\"p\">::{<\/span><span class=\"n\">From<\/span><span class=\"p\">,<\/span> <span class=\"n\">Into<\/span><span class=\"p\">};<\/span>\r\n<span class=\"k\">use<\/span> <span class=\"nn\">core<\/span><span class=\"p\">::<\/span><span class=\"nn\">ptr<\/span><span class=\"p\">::{<\/span><span class=\"n\">read_volatile<\/span><span class=\"p\">,<\/span> <span class=\"n\">write_volatile<\/span><span class=\"p\">};<\/span>\r\n<span class=\"k\">pub<\/span> <span class=\"k\">const<\/span> <span class=\"n\">GPBASE<\/span><span class=\"p\">:<\/span> <span class=\"nb\">usize<\/span> <span class=\"o\">=<\/span> <span class=\"nn\">crate<\/span><span class=\"p\">::<\/span><span class=\"n\">MMIO_BASE<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">0x20_0000<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"k\">const<\/span> <span class=\"n\">GPFSEL<\/span><span class=\"p\">:<\/span> <span class=\"nb\">usize<\/span> <span class=\"o\">=<\/span> <span class=\"n\">GPBASE<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">0x0<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">const<\/span> <span class=\"n\">GPSET<\/span><span class=\"p\">:<\/span> <span class=\"nb\">usize<\/span> <span class=\"o\">=<\/span> <span class=\"n\">GPBASE<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">0x1c<\/span><span class=\"p\">;<\/span>\r\n<span class=\"k\">const<\/span> <span class=\"n\">GPCLR<\/span><span class=\"p\">:<\/span> <span class=\"nb\">usize<\/span> <span class=\"o\">=<\/span> <span class=\"n\">GPBASE<\/span> <span class=\"o\">+<\/span> <span class=\"mi\">0x28<\/span><span class=\"p\">;<\/span>\r\n\r\n<span class=\"k\">pub<\/span> <span class=\"k\">enum<\/span> <span class=\"n\">PullMode<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">PullNone<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"n\">PullUp<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"n\">PullDown<\/span><span class=\"p\">,<\/span>\r\n<span class=\"p\">}<\/span>\r\n<span class=\"k\">impl<\/span> <span class=\"n\">From<\/span><span class=\"o\">&lt;<\/span><span class=\"n\">PullMode<\/span><span class=\"o\">&gt;<\/span> <span class=\"k\">for<\/span> <span class=\"nb\">u32<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">fn<\/span> <span class=\"nf\">from<\/span><span class=\"p\">(<\/span><span class=\"n\">val<\/span><span class=\"p\">:<\/span> <span class=\"n\">PullMode<\/span><span class=\"p\">)<\/span> <span class=\"k\">-&gt;<\/span> <span class=\"nb\">u32<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"k\">match<\/span> <span class=\"n\">val<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"nn\">PullMode<\/span><span class=\"p\">::<\/span><span class=\"n\">PullDown<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"mi\">0b10<\/span><span class=\"p\">,<\/span>\r\n            <span class=\"nn\">PullMode<\/span><span class=\"p\">::<\/span><span class=\"n\">PullNone<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"mi\">0b0<\/span><span class=\"p\">,<\/span>\r\n            <span class=\"nn\">PullMode<\/span><span class=\"p\">::<\/span><span class=\"n\">PullUp<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"mi\">1<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"p\">}<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<span class=\"k\">impl<\/span> <span class=\"nn\">core<\/span><span class=\"p\">::<\/span><span class=\"nn\">clone<\/span><span class=\"p\">::<\/span><span class=\"n\">Clone<\/span> <span class=\"k\">for<\/span> <span class=\"n\">PullMode<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">fn<\/span> <span class=\"nf\">clone<\/span><span class=\"p\">(<\/span><span class=\"o\">&amp;<\/span><span class=\"k\">self<\/span><span class=\"p\">)<\/span> <span class=\"k\">-&gt;<\/span> <span class=\"n\">Self<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"o\">*<\/span><span class=\"k\">self<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<span class=\"k\">impl<\/span> <span class=\"nn\">core<\/span><span class=\"p\">::<\/span><span class=\"nn\">marker<\/span><span class=\"p\">::<\/span><span class=\"nb\">Copy<\/span> <span class=\"k\">for<\/span> <span class=\"n\">PullMode<\/span> <span class=\"p\">{}<\/span>\r\n\r\n<span class=\"k\">pub<\/span> <span class=\"k\">enum<\/span> <span class=\"n\">GpioFunction<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">INPUT<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"n\">OUTPUT<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"n\">ALTF0<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"n\">ALTF1<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"n\">ALTF2<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"n\">ALTF3<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"n\">ALTF4<\/span><span class=\"p\">,<\/span>\r\n    <span class=\"n\">ALTF5<\/span><span class=\"p\">,<\/span>\r\n<span class=\"p\">}<\/span>\r\n<span class=\"k\">impl<\/span> <span class=\"n\">From<\/span><span class=\"o\">&lt;<\/span><span class=\"n\">GpioFunction<\/span><span class=\"o\">&gt;<\/span> <span class=\"k\">for<\/span> <span class=\"nb\">u32<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">fn<\/span> <span class=\"nf\">from<\/span><span class=\"p\">(<\/span><span class=\"n\">val<\/span><span class=\"p\">:<\/span> <span class=\"n\">GpioFunction<\/span><span class=\"p\">)<\/span> <span class=\"k\">-&gt;<\/span> <span class=\"nb\">u32<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"k\">match<\/span> <span class=\"n\">val<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"nn\">GpioFunction<\/span><span class=\"p\">::<\/span><span class=\"n\">INPUT<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"mi\">0<\/span><span class=\"p\">,<\/span>\r\n            <span class=\"nn\">GpioFunction<\/span><span class=\"p\">::<\/span><span class=\"n\">OUTPUT<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"mi\">1<\/span><span class=\"p\">,<\/span>\r\n            <span class=\"nn\">GpioFunction<\/span><span class=\"p\">::<\/span><span class=\"n\">ALTF0<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"mi\">0b100<\/span><span class=\"p\">,<\/span>\r\n            <span class=\"nn\">GpioFunction<\/span><span class=\"p\">::<\/span><span class=\"n\">ALTF1<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"mi\">0b101<\/span><span class=\"p\">,<\/span>\r\n            <span class=\"nn\">GpioFunction<\/span><span class=\"p\">::<\/span><span class=\"n\">ALTF2<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"mi\">0b110<\/span><span class=\"p\">,<\/span>\r\n            <span class=\"nn\">GpioFunction<\/span><span class=\"p\">::<\/span><span class=\"n\">ALTF3<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"mi\">0b111<\/span><span class=\"p\">,<\/span>\r\n            <span class=\"nn\">GpioFunction<\/span><span class=\"p\">::<\/span><span class=\"n\">ALTF4<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"mi\">0b011<\/span><span class=\"p\">,<\/span>\r\n            <span class=\"nn\">GpioFunction<\/span><span class=\"p\">::<\/span><span class=\"n\">ALTF5<\/span> <span class=\"k\">=&gt;<\/span> <span class=\"mi\">0b010<\/span><span class=\"p\">,<\/span>\r\n        <span class=\"p\">}<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">impl<\/span> <span class=\"nn\">core<\/span><span class=\"p\">::<\/span><span class=\"nn\">clone<\/span><span class=\"p\">::<\/span><span class=\"n\">Clone<\/span> <span class=\"k\">for<\/span> <span class=\"n\">GpioFunction<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">fn<\/span> <span class=\"nf\">clone<\/span><span class=\"p\">(<\/span><span class=\"o\">&amp;<\/span><span class=\"k\">self<\/span><span class=\"p\">)<\/span> <span class=\"k\">-&gt;<\/span> <span class=\"n\">Self<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"o\">*<\/span><span class=\"k\">self<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">impl<\/span> <span class=\"nn\">core<\/span><span class=\"p\">::<\/span><span class=\"nn\">marker<\/span><span class=\"p\">::<\/span><span class=\"nb\">Copy<\/span> <span class=\"k\">for<\/span> <span class=\"n\">GpioFunction<\/span> <span class=\"p\">{}<\/span>\r\n\r\n<span class=\"c\">\/\/\/ struct for gpio pin<\/span>\r\n<span class=\"k\">pub<\/span> <span class=\"k\">struct<\/span> <span class=\"n\">GpioPin<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"n\">pin<\/span><span class=\"p\">:<\/span> <span class=\"nb\">u32<\/span><span class=\"p\">,<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">impl<\/span> <span class=\"n\">GpioPin<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"c\">\/\/\/ make new instance witout init<\/span>\r\n    <span class=\"k\">pub<\/span> <span class=\"k\">fn<\/span> <span class=\"nf\">new<\/span><span class=\"p\">(<\/span><span class=\"n\">pin<\/span><span class=\"p\">:<\/span> <span class=\"nb\">u32<\/span><span class=\"p\">)<\/span> <span class=\"k\">-&gt;<\/span> <span class=\"n\">Self<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"n\">Self<\/span> <span class=\"p\">{<\/span> <span class=\"n\">pin<\/span> <span class=\"p\">}<\/span>\r\n    <span class=\"p\">}<\/span>\r\n\r\n    <span class=\"k\">pub<\/span> <span class=\"k\">fn<\/span> <span class=\"nf\">set_function<\/span><span class=\"p\">(<\/span><span class=\"o\">&amp;<\/span><span class=\"k\">self<\/span><span class=\"p\">,<\/span> <span class=\"n\">func<\/span><span class=\"p\">:<\/span> <span class=\"n\">GpioFunction<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"nf\">gpio_ctrl<\/span><span class=\"p\">(<\/span><span class=\"k\">self<\/span><span class=\"py\">.pin<\/span><span class=\"p\">,<\/span> <span class=\"n\">func<\/span><span class=\"nf\">.into<\/span><span class=\"p\">(),<\/span> <span class=\"n\">GPFSEL<\/span><span class=\"p\">,<\/span> <span class=\"mi\">3<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"p\">}<\/span>\r\n\r\n    <span class=\"k\">pub<\/span> <span class=\"k\">fn<\/span> <span class=\"nf\">set_high<\/span><span class=\"p\">(<\/span><span class=\"o\">&amp;<\/span><span class=\"k\">mut<\/span> <span class=\"k\">self<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"nf\">gpio_ctrl<\/span><span class=\"p\">(<\/span><span class=\"k\">self<\/span><span class=\"py\">.pin<\/span><span class=\"p\">,<\/span> <span class=\"mi\">1<\/span><span class=\"p\">,<\/span> <span class=\"n\">GPSET<\/span><span class=\"p\">,<\/span> <span class=\"mi\">1<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"p\">}<\/span>\r\n\r\n    <span class=\"k\">pub<\/span> <span class=\"k\">fn<\/span> <span class=\"nf\">set_low<\/span><span class=\"p\">(<\/span><span class=\"o\">&amp;<\/span><span class=\"k\">mut<\/span> <span class=\"k\">self<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"nf\">gpio_ctrl<\/span><span class=\"p\">(<\/span><span class=\"k\">self<\/span><span class=\"py\">.pin<\/span><span class=\"p\">,<\/span> <span class=\"mi\">1<\/span><span class=\"p\">,<\/span> <span class=\"n\">GPCLR<\/span><span class=\"p\">,<\/span> <span class=\"mi\">1<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">fn<\/span> <span class=\"nf\">gpio_ctrl<\/span><span class=\"p\">(<\/span><span class=\"n\">pin_num<\/span><span class=\"p\">:<\/span> <span class=\"nb\">u32<\/span><span class=\"p\">,<\/span> <span class=\"n\">value<\/span><span class=\"p\">:<\/span> <span class=\"nb\">u32<\/span><span class=\"p\">,<\/span> <span class=\"n\">base<\/span><span class=\"p\">:<\/span> <span class=\"nb\">usize<\/span><span class=\"p\">,<\/span> <span class=\"n\">width<\/span><span class=\"p\">:<\/span> <span class=\"nb\">usize<\/span><span class=\"p\">)<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">let<\/span> <span class=\"n\">frame<\/span> <span class=\"o\">=<\/span> <span class=\"mi\">32<\/span> <span class=\"o\">\/<\/span> <span class=\"n\">width<\/span><span class=\"p\">;<\/span>\r\n    <span class=\"k\">let<\/span> <span class=\"n\">reg<\/span> <span class=\"o\">=<\/span> <span class=\"p\">(<\/span><span class=\"n\">base<\/span> <span class=\"o\">+<\/span> <span class=\"p\">(<\/span><span class=\"n\">pin_num<\/span> <span class=\"k\">as<\/span> <span class=\"nb\">usize<\/span> <span class=\"o\">\/<\/span> <span class=\"n\">frame<\/span><span class=\"p\">)<\/span> <span class=\"o\">*<\/span> <span class=\"mi\">4<\/span><span class=\"p\">)<\/span> <span class=\"k\">as<\/span> <span class=\"o\">*<\/span><span class=\"k\">mut<\/span> <span class=\"nb\">u32<\/span><span class=\"p\">;<\/span>\r\n    <span class=\"k\">let<\/span> <span class=\"n\">shift<\/span> <span class=\"o\">=<\/span> <span class=\"p\">((<\/span><span class=\"n\">pin_num<\/span> <span class=\"k\">as<\/span> <span class=\"nb\">usize<\/span> <span class=\"o\">%<\/span> <span class=\"n\">frame<\/span><span class=\"p\">)<\/span> <span class=\"o\">*<\/span> <span class=\"n\">width<\/span><span class=\"p\">)<\/span> <span class=\"k\">as<\/span> <span class=\"nb\">u32<\/span><span class=\"p\">;<\/span>\r\n    <span class=\"k\">let<\/span> <span class=\"n\">val<\/span> <span class=\"o\">=<\/span> <span class=\"n\">value<\/span> <span class=\"o\">&lt;&lt;<\/span> <span class=\"n\">shift<\/span><span class=\"p\">;<\/span>\r\n    <span class=\"k\">let<\/span> <span class=\"n\">mask<\/span> <span class=\"o\">=<\/span> <span class=\"p\">((<\/span><span class=\"mi\">1<\/span> <span class=\"o\">&lt;&lt;<\/span> <span class=\"n\">width<\/span> <span class=\"k\">as<\/span> <span class=\"nb\">u32<\/span><span class=\"p\">)<\/span> <span class=\"o\">-<\/span> <span class=\"mi\">1<\/span><span class=\"p\">)<\/span> <span class=\"o\">&lt;&lt;<\/span> <span class=\"n\">shift<\/span><span class=\"p\">;<\/span>\r\n\r\n    <span class=\"k\">unsafe<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"k\">let<\/span> <span class=\"n\">tmp<\/span> <span class=\"o\">=<\/span> <span class=\"nf\">read_volatile<\/span><span class=\"p\">(<\/span><span class=\"n\">reg<\/span><span class=\"p\">);<\/span> <span class=\"c\">\/\/ read the previous value<\/span>\r\n        <span class=\"nf\">write_volatile<\/span><span class=\"p\">(<\/span><span class=\"n\">reg<\/span><span class=\"p\">,<\/span> <span class=\"p\">(<\/span><span class=\"n\">tmp<\/span> <span class=\"o\">&amp;<\/span> <span class=\"o\">!<\/span><span class=\"n\">mask<\/span><span class=\"p\">)<\/span> <span class=\"p\">|<\/span> <span class=\"n\">val<\/span><span class=\"p\">);<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<pre class=\"post-pre\"><code><span class=\"k\">use<\/span> <span class=\"nn\">crate<\/span><span class=\"p\">::<\/span><span class=\"n\">main<\/span><span class=\"p\">;<\/span>\r\n<span class=\"nd\">global_asm!<\/span><span class=\"p\">(<\/span><span class=\"nd\">include_str!<\/span><span class=\"p\">(<\/span><span class=\"s\">\"boot.S\"<\/span><span class=\"p\">));<\/span>\r\n\r\n<span class=\"nd\">#[no_mangle]<\/span>\r\n<span class=\"k\">fn<\/span> <span class=\"mi\">_<\/span><span class=\"nf\">rust_start<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"nf\">init_bss<\/span><span class=\"p\">();<\/span>\r\n    <span class=\"nf\">main<\/span><span class=\"p\">();<\/span>\r\n<span class=\"p\">}<\/span>\r\n<span class=\"k\">extern<\/span> <span class=\"s\">\"C\"<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">static<\/span> <span class=\"mi\">__<\/span><span class=\"n\">bss_start<\/span><span class=\"p\">:<\/span> <span class=\"nn\">core<\/span><span class=\"p\">::<\/span><span class=\"nn\">cell<\/span><span class=\"p\">::<\/span><span class=\"n\">UnsafeCell<\/span><span class=\"o\">&lt;<\/span><span class=\"nb\">u64<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">;<\/span>\r\n    <span class=\"k\">static<\/span> <span class=\"mi\">__<\/span><span class=\"n\">bss_end<\/span><span class=\"p\">:<\/span> <span class=\"nn\">core<\/span><span class=\"p\">::<\/span><span class=\"nn\">cell<\/span><span class=\"p\">::<\/span><span class=\"n\">UnsafeCell<\/span><span class=\"o\">&lt;<\/span><span class=\"nb\">u64<\/span><span class=\"o\">&gt;<\/span><span class=\"p\">;<\/span>\r\n<span class=\"p\">}<\/span>\r\n\r\n<span class=\"k\">fn<\/span> <span class=\"nf\">init_bss<\/span><span class=\"p\">()<\/span> <span class=\"p\">{<\/span>\r\n    <span class=\"k\">let<\/span> <span class=\"k\">mut<\/span> <span class=\"n\">ptr<\/span> <span class=\"o\">=<\/span> <span class=\"k\">unsafe<\/span> <span class=\"p\">{<\/span> <span class=\"mi\">__<\/span><span class=\"n\">bss_start<\/span><span class=\"nf\">.get<\/span><span class=\"p\">()<\/span> <span class=\"p\">};<\/span>\r\n    <span class=\"k\">let<\/span> <span class=\"n\">end<\/span> <span class=\"o\">=<\/span> <span class=\"k\">unsafe<\/span> <span class=\"p\">{<\/span> <span class=\"mi\">__<\/span><span class=\"n\">bss_end<\/span><span class=\"nf\">.get<\/span><span class=\"p\">()<\/span> <span class=\"p\">};<\/span>\r\n    <span class=\"k\">while<\/span> <span class=\"n\">ptr<\/span> <span class=\"o\">&lt;=<\/span> <span class=\"n\">end<\/span> <span class=\"p\">{<\/span>\r\n        <span class=\"k\">unsafe<\/span> <span class=\"p\">{<\/span>\r\n            <span class=\"nn\">core<\/span><span class=\"p\">::<\/span><span class=\"nn\">ptr<\/span><span class=\"p\">::<\/span><span class=\"nf\">write_volatile<\/span><span class=\"p\">(<\/span><span class=\"n\">ptr<\/span><span class=\"p\">,<\/span> <span class=\"mi\">0<\/span><span class=\"p\">);<\/span>\r\n            <span class=\"n\">ptr<\/span> <span class=\"o\">=<\/span> <span class=\"n\">ptr<\/span><span class=\"nf\">.offset<\/span><span class=\"p\">(<\/span><span class=\"mi\">1<\/span><span class=\"p\">);<\/span>\r\n        <span class=\"p\">}<\/span>\r\n    <span class=\"p\">}<\/span>\r\n<span class=\"p\">}<\/span>\r\n<\/code><\/pre>\n<p>\u4ee5\u4e0a\u3067\u3059\uff01<\/p>\n<p>\u6700\u5f8c\u306b\u3001.cargo\u3068\u3044\u3046\u30c7\u30a3\u30ec\u30af\u30c8\u30ea\u3092\u4f5c\u3063\u3066\u3001<\/p>\n<pre class=\"post-pre\"><code><span class=\"nn\">[build]<\/span>\r\n<span class=\"py\">target<\/span><span class=\"p\">=<\/span><span class=\"s\">\"aarch64-unknown-none\"<\/span>\r\n<span class=\"py\">rustflags<\/span> <span class=\"p\">=<\/span> <span class=\"nn\">[\"-C\",\"link-arg=-Tsrc\/link.ld\"]<\/span>\r\n<\/code><\/pre>\n<p>\u3068\u5165\u308c\u3066\u304a\u3044\u3066\u304f\u3060\u3055\u3044\u3002\u74b0\u5883\u5909\u6570RUST_FLAGS\u3067\u30a8\u30af\u30b9\u30dd\u30fc\u30c8\u3057\u3066\u3082\u3044\u3044\u306f\u305a\u3067\u3059\u3002\u3042\u3068\u3001Cargo.toml\u306b<\/p>\n<pre class=\"post-pre\"><code>[profile.dev]\r\npanic = \"abort\"\r\n<\/code><\/pre>\n<p>\u3092\u4ed8\u3051\u52a0\u3048\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<p>\u3053\u3053\u307e\u3067\u7d42\u308f\u3063\u305f\u3089make build\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001img\u30d5\u30a1\u30a4\u30eb\u304c\u4f5c\u6210\u3055\u308c\u308b\u306e\u3067\u3001SD\u30ab\u30fc\u30c9\u306b\u30b3\u30d4\u30fc\u3057\u3066\u304f\u3060\u3055\u3044\u3002\u30e9\u30ba\u30d1\u30a4\u306e\u96fb\u6e90\u3092\u3044\u308c\u308c\u3070\u3001L\u30c1\u30ab\u3059\u308b\u306f\u305a\u3002\u3002\u3002<\/p>\n<p>\u3061\u306a\u307f\u306b\u3001\u304b\u3093\u305f\u3093\u306a\u306e\u3067\u56de\u8def\u306f\u7d39\u4ecb\u3057\u3066\u3044\u307e\u305b\u3093\u304c\u3001GPIO16\u306b\u3064\u306a\u3044\u3067\u307e\u3059\u3002<\/p>\n<p>objdump \u5b9f\u884c\u3059\u308b\u3068\u308f\u304b\u308b\u3068\u601d\u3046\u306e\u3067\u3059\u304c\u3001C\u306b\u6bd4\u3079\u3066\u3081\u3063\u3061\u3083\u547d\u4ee4\u6570\u304c\u591a\u3044\u3002\u3002\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Rust\u3067\u7d44\u307f\u8fbc\u307f L\u30c1\u30ab Rust\u3067Raspberry Pi4\u3092\u5bfe\u8c61\u306b\u7d44\u307f\u8fbc\u307f\u306e\u958b\u767a\u74b0\u5883\u3092\u6574\u3048\u3066\u3044\u304d\u307e\u3059\u3002  [&hellip;]<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-45496","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>- Blog - Silicon Cloud<\/title>\n<meta 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