HAL KEY 的头文件 按键定义为什么要采用寄存器操作,而不是函数操作
/* 1 - KEY */ #define KEY1_BV BV(22) #define KEY2_BV #define KEY3_BV #define KEY4_BV #define KEY1_PU (R32_PB_PU |= KEY1_BV) #define KEY2_PU () #define KEY3_PU () #define KEY4_PU () #define KEY1_DIR (R32_PB_DIR &= ~KEY1_BV) #define KEY2_PU () #define KEY3_PU () #define KEY4_PU () #define KEY1_IN (ACTIVE_LOW(R32_PB_PIN&KEY1_BV)) #define KEY2_IN () #define KEY3_IN () #define KEY4_IN () #define HAL_PUSH_BUTTON1() ( KEY1_IN ) //添加自定义按键 #define HAL_PUSH_BUTTON2() ( 0 ) #define HAL_PUSH_BUTTON3() ( 0 ) #define HAL_PUSH_BUTTON4() ( 0 )
为什么不直接定义
#define HAL_PUSH_BUTTON1() ( GPIOB_ReadPortPin(GPIO_Pin_22 ) //添加自定义按键
if( HAL_PUSH_BUTTON1()==0 ){
keys |= HAL_KEY_SW_1;
}
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CH394: 以太网协议栈芯片
