stm32f103 所对应的 3x4 键盘中断模式
时间: 2023-08-06 07:05:10 浏览: 36
对于STM32F103微控制器,你可以使用外部中断来实现3x4键盘的输入,以提高响应速度和降低功耗。以下是一个使用外部中断的示例代码,用于连接3x4键盘并在按键按下时触发中断:
```c
#include "stm32f10x.h"
// 定义行和列的GPIO引脚
#define ROW1_PIN GPIO_Pin_0
#define ROW2_PIN GPIO_Pin_1
#define ROW3_PIN GPIO_Pin_2
#define COL1_PIN GPIO_Pin_3
#define COL2_PIN GPIO_Pin_4
#define COL3_PIN GPIO_Pin_5
void keypad_init()
{
// 初始化行为输出模式,列为输入模式
GPIO_InitTypeDef GPIO_InitStructure;
// 配置行为推挽输出模式
GPIO_InitStructure.GPIO_Pin = ROW1_PIN | ROW2_PIN | ROW3_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// 配置列为上拉输入模式
GPIO_InitStructure.GPIO_Pin = COL1_PIN | COL2_PIN | COL3_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IPU;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
void EXTI_Configuration()
{
// 配置外部中断线
EXTI_InitTypeDef EXTI_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
// 配置列引脚为外部中断输入
GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource3);
GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource4);
GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource5);
// 配置外部中断线为上升沿触发
EXTI_InitStructure.EXTI_Line = EXTI_Line3 | EXTI_Line4 | EXTI_Line5;
EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
EXTI_InitStructure.EXTI_LineCmd = ENABLE;
EXTI_Init(&EXTI_InitStructure);
// 配置外部中断线对应的中断处理函数
NVIC_InitStructure.NVIC_IRQChannel = EXTI3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = EXTI4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = EXTI9_5_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void EXTI3_IRQHandler(void)
{
if (EXTI_GetITStatus(EXTI_Line3) != RESET)
{
// 处理按键3的中断
// 在这里添加你的按键处理逻辑
EXTI_ClearITPendingBit(EXTI_Line3);
}
}
void EXTI4_IRQHandler(void)
{
if (EXTI_GetITStatus(EXTI_Line4) != RESET)
{
// 处理按键4的中断
// 在这里添加你的按键处理逻辑
EXTI_ClearITPendingBit(EXTI_Line4);
}
}
void EXTI9_5_IRQHandler(void)
{
if (EXTI_GetITStatus(EXTI_Line5) != RESET)
{
// 处理按键5的中断
// 在这里添加你的按键处理逻辑
EXTI_ClearITPendingBit(EXTI_Line5);
}
}
int main()
{
// 初始化键盘
keypad_init();
// 配置外部中断
EXTI_Configuration();
while (1)
{
// 主循环中不需要做任何处理
}
}
```
请注意,以上代码只是一个简单的示例,你可能需要根据你具体的硬件连接和需求进行调整。希望对你有所帮助!