图中的4个按键，只有3个IO，如何实现按键检测

杂杂辉520 · 发表于 2025-4-8 10:43:50

在学习51单片机，从别人的产品上弄的按键电路，这4个按键怎么扫描检测？怎么按下亮下熄灭，求大神附上代码谢谢。使用豆包这个AI也解决不了

yfpc2006 · 发表于 2025-4-8 10:43:51

我用STM32G030F6P6两个IO，实现4个按钮功能都很好实现，楼主这个更简单了一些，

uint8_t OUT1_Flag = 0, OUT2_Flag = 0, OUT3_Flag = 0, OUT4_Flag = 0;
uint8_t K1_Down_Flag = 0, K2_Down_Flag = 0, K3_Down_Flag = 0, K4_Down_Flag = 0; //KEY1,2,3,4按下标志

void KEY_IO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};          //定义一个设置GPIO的变量
__HAL_RCC_GPIOB_CLK_ENABLE();             //使能时钟
__HAL_RCC_GPIOC_CLK_ENABLE();             //使能时钟

GPIO_InitStruct.Pin = K1_2_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;          //输入模式
GPIO_InitStruct.Pull = GPIO_NOPULL;             //弱下拉
HAL_GPIO_Init(K1_2_GROUP, &GPIO_InitStruct);

GPIO_InitStruct.Pin = K3_4_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;          //输入模式
GPIO_InitStruct.Pull = GPIO_NOPULL;             //弱下拉
HAL_GPIO_Init(K3_4_GROUP, &GPIO_InitStruct);
}

void K1_IO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.Pin = K1_2_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;          //输入模式
GPIO_InitStruct.Pull = GPIO_PULLDOWN;          //弱下拉开
HAL_GPIO_Init(K1_2_GROUP, &GPIO_InitStruct);
}

void K2_IO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};
GPIO_InitStruct.Pin = K1_2_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;          //输入模式
GPIO_InitStruct.Pull = GPIO_PULLUP;             //弱上拉开
HAL_GPIO_Init(K1_2_GROUP, &GPIO_InitStruct);
}

void K3_IO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};

GPIO_InitStruct.Pin = K3_4_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;          //输入模式
GPIO_InitStruct.Pull = GPIO_PULLDOWN;          //弱下拉开
HAL_GPIO_Init(K3_4_GROUP, &GPIO_InitStruct);
}

void K4_IO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStruct = {0};

GPIO_InitStruct.Pin = K3_4_PIN;
GPIO_InitStruct.Mode = GPIO_MODE_INPUT;          //输入模式
GPIO_InitStruct.Pull = GPIO_PULLUP;             //弱上拉开
HAL_GPIO_Init(K3_4_GROUP, &GPIO_InitStruct);
}

//按键输出
void KEY_TO_OUT(void)
{
K1_TO_OUT1();
K2_TO_OUT2();
K3_TO_OUT3();
K4_TO_OUT4();
}

void K1_TO_OUT1(void)
{
K1_IO_Init(); //下拉
if(K1_2_IN_STA == 1)    //K1按下
{
Delay_Ms(5);
if(K1_2_IN_STA == 1)    //K1按下
{
if(OUT1_Flag == 0)
{
OUT1_Flag = 1;

if(OUT1_IN_STA == 0)
{
OUT1_ON;
u1_printf("OUT1_ON ");
                  OUT1_State(); //发送当前开关状态
}
else
{
OUT1_OFF;
OUT1_State(); //发送当前开关状态
u1_printf("OUT1_OFF ");
}
}
}
}
else
{
OUT1_Flag = 0;
}
}

void K2_TO_OUT2(void)
{
K2_IO_Init();//上拉
if(K1_2_IN_STA == 0) //K2按下
{
Delay_Ms(5);
if(K1_2_IN_STA == 0) //K2按下
{
if(OUT2_Flag == 0)
{
OUT2_Flag = 1;

if(OUT2_IN_STA == 0)
{
OUT2_ON;
OUT2_State(); //发送当前开关状态
u1_printf("OUT2_ON ");
}
else
{
OUT2_OFF;
OUT2_State(); //发送当前开关状态
u1_printf("OUT2_OFF ");
}
}
}
}
else
{
OUT2_Flag = 0;
}
}

void K3_TO_OUT3(void)
{
K3_IO_Init();//下拉
if(K3_4_IN_STA == 1) //K2按下
{
Delay_Ms(5);
if(K3_4_IN_STA == 1) //K2按下
{
if(OUT3_Flag == 0)
{
OUT3_Flag = 1;

if(OUT3_IN_STA == 0)
{
OUT3_ON;
OUT3_State(); //发送当前开关状态
u1_printf("OUT3_ON ");
}
else
{
OUT3_OFF;
OUT3_State(); //发送当前开关状态
u1_printf("OUT3_OFF ");
}
}
}
}
else
{
OUT3_Flag = 0;
}
}

void K4_TO_OUT4(void)
{
K4_IO_Init();//上拉
if(K3_4_IN_STA == 0) //K2按下
{
Delay_Ms(5);
if(K3_4_IN_STA == 0) //K2按下
{
if(OUT4_Flag == 0)
{
OUT4_Flag = 1;

if(OUT4_IN_STA == 0)
{
OUT4_ON;
OUT4_State(); //发送当前开关状态
u1_printf("OUT4_ON ");
}
else
{
OUT4_OFF;
OUT4_State(); //发送当前开关状态
u1_printf("OUT4_OFF ");
}
}
}
}
else
{
OUT4_Flag = 0;
}
}