基于STM32的寄存器实现点亮LED--基于RUST实现

main.rs

#![no_std]
#![no_main]

use core::ptr;
use cortex_m_rt::entry;
use panic_halt as _; // 当发生 panic 时停止执行

// 定义寄存器地址
const RCC_BASE: u32 = 0x40021000;
const GPIOB_BASE: u32 = 0x40010C00;

const RCC_APB2ENR_OFFSET: u32 = 0x18;
const GPIOB_CRL_OFFSET: u32 = 0x00;
const GPIOB_ODR_OFFSET: u32 = 0x0C;

#[entry]
fn main() -> ! {
    // 开启 GPIOB 时钟
    unsafe {
        let rcc_apb2enr = (RCC_BASE + RCC_APB2ENR_OFFSET) as *mut u32;
        ptr::write_volatile(rcc_apb2enr, ptr::read_volatile(rcc_apb2enr) | (1 << 3));
    }

    // 配置 PB5 为推挽输出模式，2MHz
    unsafe {
        let gpio_crl = (GPIOB_BASE + GPIOB_CRL_OFFSET) as *mut u32;
        // 清除 PB5 的模式和配置位
        ptr::write_volatile(gpio_crl, ptr::read_volatile(gpio_crl) & !(0b0110 << (4 * 5)));
        // 设置 PB5 为推挽输出，模式为 2MHz
        ptr::write_volatile(gpio_crl, ptr::read_volatile(gpio_crl) | (0b0010 << (4 * 5)));
    }

    // 设置 PB5 低电平（点亮 LED）
    unsafe {
        let gpio_odr = (GPIOB_BASE + GPIOB_ODR_OFFSET) as *mut u32;
        ptr::write_volatile(gpio_odr, ptr::read_volatile(gpio_odr) & !(1 << 5));
    }

    // 无限循环，防止程序结束
    loop {}
}

完整的项目源码地址

https://gitee.com/navysummer/stm32-rust-demo/tree/master/reg_led