set blue pill LED using rust stm32 hal

blue_pill_hal.rs

#![no_std]
#![cfg_attr(not(doc), no_main)]

//use panic_rtt_target as _;
use panic_halt as _;

use cortex_m_rt::entry;
//use core::ptr;
//use stm32f1::stm32f103;
use stm32f1xx_hal::{pac, prelude::*};

//use embedded_hal::digital::v2::OutputPin;

#[entry]
fn main() -> ! {
    // Get access to the device specific peripherals from the peripheral access crate
    let dp = pac::Peripherals::take().unwrap();    
    let mut rcc = dp.RCC.constrain();    

    
    // Acquire the GPIOC peripheral
    let mut gpioc = dp.GPIOC.split(&mut rcc.apb2);

    // Configure gpio C pin 13 as a push-pull output. The `crh` register is passed to the function
    // in order to configure the port. For pins 0-7, crl should be passed instead.
    gpioc.pc13.into_push_pull_output(&mut gpioc.crh);

       
    loop {}
}