Matrix - Button/zh

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1 介绍

Btn01

该按键在未按时输出高电平,按下后输出低电平。

2 特性

  • 使用标准的3 PIN接口
  • 尺寸为 8x24mm

3 使用方法

3.1 连接

  • 连接到Tiny4412 SDK (1505)
将配件S针脚连接到GPIO PIN1, V接5V,G接地

3.2 Linux下的C示例

#include <stdio.h>
#include "libfahw.h"
 
static struct sensor button[] = {
        {
                TINY4412_GPIO_PIN1,
                IRQ_TYPE_EDGE_FALLING,
        }
};
 
int main(void)
{
    int i;
    int retSize = -1;
    char value[ARRAY_SIZE(button)];
    int devFD = -1;
    if ((devFD =sensorInit(button, ARRAY_SIZE(button))) == -1) {
        printf("Fail to init sensor\n");
        return -1;
    }
    printf("Press the button...\n");
    if (( retSize = sensorRead(devFD, value, ARRAY_SIZE(button)) ) == -1) {
        printf("Fail to read sensors\n");
    }
    if (retSize > 0) {
        i = 0;
        for (i=0; i<retSize; i++) {
            printf("Button[%d]:%d\n", i, value[i]);
        }
    }
    sensorDeinit(devFD);
    return 0;
}

3.3 编译并运行示例

git clone http://github.com/friendlyarm/fa-hardware.git
cd fa-hardware
cd demo
cd button
make

将编译生成的button通过ftp上传到开发板上运行即可测试。

4 相关资料