STM32F103C8T6使用独立按键控制呼吸灯的代码

您可以参考以下代码实现：

#include <stm32f10x.h>

#define LED_PIN     GPIO_Pin_1
#define LED_PORT    GPIOC

#define KEY_PIN     GPIO_Pin_0
#define KEY_PORT    GPIOA

#define PERIOD      1000

void led_breath(uint16_t delay);
void delay_ms(uint32_t ms);

int main(void)
{
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOA, ENABLE);

    GPIO_InitTypeDef GPIO_InitStructure;

    GPIO_InitStructure.GPIO_Pin = LED_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(LED_PORT, &GPIO_InitStructure);

    GPIO_InitStructure.GPIO_Pin = KEY_PIN;
    GPIO_InitStructure.GPIO_Mode  = GPIO_Mode_IPU;
    GPIO_Init(KEY_PORT, &GPIO_InitStructure);

    uint8_t state = 0;
    while (1)
    {
        if (GPIO_ReadInputDataBit(KEY_PORT, KEY_PIN) == RESET)
        {
            if (state == 0)
            {
                state = 1;
                led_breath(10);
            }
        }
        else
        {
            state = 0;
            GPIO_WriteBit(LED_PORT, LED_PIN, Bit_RESET);
        }
    }
}

void led_breath(uint16_t delay)
{
    int i = 0;
    while (1)
    {
        for (i = 0; i <= PERIOD; i++)
        {
            GPIO_WriteBit(LED_PORT, LED_PIN, Bit_SET);
            delay_ms((PERIOD + 1 - i) * delay);
            GPIO_WriteBit(LED_PORT, LED_PIN, Bit_RESET);
            delay_ms(i * delay);
        }
        for (i = PERIOD; i >= 0; i--)
        {
            GPIO_WriteBit(LED_PORT, LED_PIN, Bit_SET);
            delay_ms((PERIOD + 1 - i) * delay);
            GPIO_WriteBit(LED_PORT, LED_PIN, Bit_RESET);
            delay_ms(i * delay);
        }
    }
}

void delay_ms(uint32_t ms)
{
    uint32_t i, j;
    for (i = 0; i < ms; i++)
        for (j = 0; j < 1000; j++);
}

该代码使用独立按键控制一个LED呼吸灯，使用的是STM32F103C8T6开发板。在按下按键时，LED会呼吸灯效果。该代码使用了delay_ms函数进行毫秒级延时。