【Arduino工作〜発展編】AVR-RustでAtmega328pをLチカ！レベル2

            $ sudo avrdude -c atmelice_isp -P usb -p m328p -v
avrdude: Version 6.3-20171130
         Copyright (c) 2000-2005 Brian Dean, http://www.bdmicro.com/
         Copyright (c) 2007-2014 Joerg Wunsch

         System wide configuration file is "/etc/avrdude.conf"
         User configuration file is "/root/.avrduderc"
         User configuration file does not exist or is not a regular file, skipping

         Using Port                    : usb
         Using Programmer              : atmelice_isp
avrdude: Found CMSIS-DAP compliant device, using EDBG protocol
         AVR Part                      : ATmega328P
         Chip Erase delay              : 9000 us
         PAGEL                         : PD7
         BS2                           : PC2
         RESET disposition             : dedicated
         RETRY pulse                   : SCK
         serial program mode           : yes
         parallel program mode         : yes
         Timeout                       : 200
         StabDelay                     : 100
         CmdexeDelay                   : 25
         SyncLoops                     : 32
         ByteDelay                     : 0
         PollIndex                     : 3
         PollValue                     : 0x53
         Memory Detail                 :

                                  Block Poll               Page                       Polled
           Memory Type Mode Delay Size  Indx Paged  Size   Size #Pages MinW  MaxW   ReadBack
           ----------- ---- ----- ----- ---- ------ ------ ---- ------ ----- ----- ---------
           eeprom        65    20     4    0 no       1024    4      0  3600  3600 0xff 0xff
           flash         65     6   128    0 yes     32768  128    256  4500  4500 0xff 0xff
           lfuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           hfuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           efuse          0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           lock           0     0     0    0 no          1    0      0  4500  4500 0x00 0x00
           calibration    0     0     0    0 no          1    0      0     0     0 0x00 0x00
           signature      0     0     0    0 no          3    0      0     0     0 0x00 0x00

         Programmer Type : JTAG3_ISP
         Description     : Atmel-ICE (ARM/AVR) in ISP mode
         Vtarget         : 5.0 V
         SCK period      : 8.00 us

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.00s

avrdude: Device signature = 0x1e950f (probably m328p)
avrdude: safemode: lfuse reads as 62
avrdude: safemode: hfuse reads as D9
avrdude: safemode: efuse reads as FF

avrdude: safemode: lfuse reads as 62
avrdude: safemode: hfuse reads as D9
avrdude: safemode: efuse reads as FF
avrdude: safemode: Fuses OK (E:FF, H:D9, L:62)

avrdude done.  Thank you.
        

            $ tree
.
├── Cargo.toml
├── src
│   └── main.rs
└── avr-atmega328p.json
        

            [package]
name = "std-blink"
version = "0.1.0"
authors = ["tacoskingdom<contact@tacoskingdom.com>"]
edition = "2018"

[dependencies]
avr-std-stub = "1.0.2"
avrd = "0.3.1"
avr_delay = { git = "https://github.com/avr-rust/delay" }
        

            {
    "arch": "avr",
    "cpu": "atmega328p",
    "data-layout": "e-P1-p:16:8-i8:8-i16:8-i32:8-i64:8-f32:8-f64:8-n8-a:8",
    "env": "",
    "executables": true,
    "linker": "avr-gcc",
    "linker-flavor": "gcc",
    "linker-is-gnu": true,
    "llvm-target": "avr-unknown-unknown",
    "no-compiler-rt": true,
    "os": "unknown",
    "position-independent-executables": false,
    "exe-suffix": ".elf",
    "eh-frame-header": false,
    "pre-link-args": {
      "gcc": ["-mmcu=atmega328p"]
    },
    "late-link-args": {
      "gcc": ["-lgcc", "-lc"]
    },
    "target-c-int-width": "16",
    "target-endian": "little",
    "target-pointer-width": "16",
    "vendor": "unknown"
}
        

            pub fn delay(count: u32) {
    // Our asm busy-wait takes a 16 bit word as an argument,
    // so the max number of loops is 2^16
    let outer_count = count / 65536;
    let last_count = ((count % 65536)+1) as u16;
    for _ in 0..outer_count {
        // Each loop through should be 4 cycles.
        unsafe {llvm_asm!("1: sbiw $0,1
                      brne 1b"
                     :
                     : "w" (0)
                     :
                     :)}
    }
    unsafe {llvm_asm!("1: sbiw $0,1
                      brne 1b"
                 :
                 : "w" (last_count)
                 :
                 :)}
}
        

            #![feature(llvm_asm, lang_items, unwind_attributes)]
#![no_std]
#![no_main]

extern crate avr_delay;
extern crate avr_std_stub;
extern crate avrd;

//👇①
use avrd::atmega328p::{DDRB, PORTB};

use avr_delay::{delay};

//👇Rust組込関数のwrite_volatileからメモリへの書き込みを行う
use core::ptr::write_volatile;

#[no_mangle]
pub extern "C" fn main() {
    unsafe {
        //👇②
        write_volatile(DDRB, 0b00000010);
    }
    let mut out = 0b00000000;
    loop {
        unsafe {
            //👇③
            write_volatile(PORTB, out);
        }
        //システムクロック周波数1MHzで1秒待つ
        delay(250000);
        //👇④
        out ^= 1 << 1;
    }
}
        

            $ export AVR_CPU_FREQUENCY_HZ=16000000
$ cargo build -Z build-std=core --target avr-atmega328p.json --release
    Updating crates.io index
    Updating git repository `https://github.com/avr-rust/delay`
  Downloaded proc-macro2 v1.0.30
  #...中略
  Downloaded 13 crates (1.8 MB) in 0.72s
   Compiling std-blink v0.1.0 (/usr/src/app/std-blink)
    Finished release [optimized] target(s) in 0.31s
        

            $ sudo avrdude -p m328p -c atmelice_isp -P usb -U flash:w:target/avr-atmega328p/release/std-blink.elf:e

avrdude: AVR device initialized and ready to accept instructions

Reading | ################################################## | 100% 0.00s

avrdude: Device signature = 0x1e950f (probably m328p)
avrdude: NOTE: "flash" memory has been specified, an erase cycle will be performed
         To disable this feature, specify the -D option.
avrdude: erasing chip
avrdude: reading input file "target/avr-atmega328p/release/std-blink.elf"
avrdude: writing flash (2446 bytes):

Writing | ################################################## | 100% 0.72s

avrdude: 2446 bytes of flash written
avrdude: verifying flash memory against target/avr-atmega328p/release/std-blink.elf:
avrdude: load data flash data from input file target/avr-atmega328p/release/std-blink.elf:
avrdude: input file target/avr-atmega328p/release/std-blink.elf contains 2446 bytes
avrdude: reading on-chip flash data:

Reading | ################################################## | 100% 0.72s

avrdude: verifying ...
avrdude: 2446 bytes of flash verified

avrdude: safemode: Fuses OK (E:FF, H:D9, L:62)

avrdude done.  Thank you.