写出 stm32f103 控制 led 灯闪烁的 代码

Sure, the code for controlling an LED on the STM32F103 microcontroller would look something like this:

#include "stm32f103xb.h" // Include the appropriate header file for your device

int main(void)
{
    RCC->APB2ENR |= RCC_APB2ENR_IOPCEN; // Enable GPIOC clock
    RCC->APB1ENR |= RCC_APB1ENR_TIM3EN; // Enable TIM3 clock

    GPIOC->CRH |= GPIO_CRH_MODE13_0; // Configure PC13 as push-pull output
    GPIOC->CRH &= ~GPIO_CRH_CNF13; // Configure PC13 as GPIO

    TIM3->PSC = 7200; // Set prescaler to 7200
    TIM3->ARR = 1000; // Set auto-reload value to 1000
    TIM3->CR1 |= TIM_CR1_CEN; // Enable timer

    while(1)
    {
        TIM3->CNT = 0; // Reset timer counter
        while(TIM3->CNT < 500); // Wait for 1/2 second
        GPIOC->BSRR |= GPIO_BSRR_BS13; // Turn on LED
        TIM3->CNT = 0; // Reset timer counter
        while(TIM3->CNT < 500); // Wait for 1/2 second
        GPIOC->BSRR |= GPIO_BSRR_BR13; // Turn off LED
    }
    
    return 0;
}

Note that this is just sample code and you would need to modify it to fit your specific hardware setup.