用keil4写一个STM32F103中断控制4个流水灯C语言代码，要求按键1控制流水灯方向，按键2控制流水灯亮灭。

好的，以下是符合你要求的C语言代码：

#include "stm32f10x.h"

#define LED_GPIO GPIOB
#define LED_PIN GPIO_Pin_12 | GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15

#define KEY1_GPIO GPIOA
#define KEY1_PIN GPIO_Pin_0

#define KEY2_GPIO GPIOA
#define KEY2_PIN GPIO_Pin_1

uint8_t direction = 1;  // 流水灯方向，1为向右，-1为向左
uint8_t led_on = 1;     // 流水灯亮灭状态，1为亮，0为灭

void GPIO_Configuration(void)
{
    GPIO_InitTypeDef GPIO_InitStructure;

    /* LED GPIO 串口口配置 */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE);
    GPIO_InitStructure.GPIO_Pin = LED_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_Init(LED_GPIO, &GPIO_InitStructure);

    /* KEY1 GPIO 串口口配置 */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    GPIO_InitStructure.GPIO_Pin = KEY1_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(KEY1_GPIO, &GPIO_InitStructure);

    /* KEY2 GPIO 串口口配置 */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
    GPIO_InitStructure.GPIO_Pin = KEY2_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(KEY2_GPIO, &GPIO_InitStructure);
}

void EXTI_Configuration(void)
{
    EXTI_InitTypeDef EXTI_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    /* KEY1 EXTI 串口口配置 */
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
    GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0);
    EXTI_InitStructure.EXTI_Line = EXTI_Line0;
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_Init(&EXTI_InitStructure);

    NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x01;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);

    /* KEY2 EXTI 串口口配置 */
    GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource1);
    EXTI_InitStructure.EXTI_Line = EXTI_Line1;
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling;
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_Init(&EXTI_InitStructure);

    NVIC_InitStructure.NVIC_IRQChannel = EXTI1_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x02;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init(&NVIC_InitStructure);
}

void delay_ms(uint32_t n)
{
    uint32_t i, j;
    for (i = 0; i < n; i++)
        for (j = 0; j < 7200; j++);
}

int main(void)
{
    GPIO_Configuration();
    EXTI_Configuration();

    while (1)
    {
        if (led_on)
        {
            if (direction == 1)
            {
                LED_GPIO->ODR = GPIO_Pin_12;
                delay_ms(100);
                LED_GPIO->ODR = GPIO_Pin_13;
                delay_ms(100);
                LED_GPIO->ODR = GPIO_Pin_14;
                delay_ms(100);
                LED_GPIO->ODR = GPIO_Pin_15;
                delay_ms(100);
            }
            else
            {
                LED_GPIO->ODR = GPIO_Pin_15;
                delay_ms(100);
                LED_GPIO->ODR = GPIO_Pin_14;
                delay_ms(100);
                LED_GPIO->ODR = GPIO_Pin_13;
                delay_ms(100);
                LED_GPIO->ODR = GPIO_Pin_12;
                delay_ms(100);
            }
        }
        else
        {
            LED_GPIO->ODR = 0x0000;
        }
    }
}

void EXTI0_IRQHandler(void)
{
    if (EXTI_GetITStatus(EXTI_Line0) != RESET)
    {
        EXTI_ClearITPendingBit(EXTI_Line0);
        direction = -direction;
    }
}

void EXTI1_IRQHandler(void)
{
    if (EXTI_GetITStatus(EXTI_Line1) != RESET)
    {
        EXTI_ClearITPendingBit(EXTI_Line1);
        led_on = !led_on;
    }
}

这段代码使用了STM32F103的4个GPIO口控制4个LED灯，使用了2个GPIO口作为按键输入控制流水灯的方向和亮灭状态，使用了EXTI外部中断来实现按键的检测。具体实现细节请参考代码注释。