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将下列程序段进行改造为:PA0、PA1、PA2、PA3使用下拉输入模式,PA4、PA5、PA6、PA7为开漏输出模式。 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE); GPIO_InitStructure.GPIO_Pin=GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7; GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP; GPIO_InitStructure.GPIO_Speed=GPIO_Speed_2MHz; GPIO_Init(GPIOA,&GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin=GPIO_Pin_0 | GPIO_Pin_1 | GPIO_Pin_2 | GPIO_Pin_3; GPIO_InitStructure.GPIO_Mode=GPIO_Mode_IPU; GPIO_Init(GPIOA,&GPIO_InitStructure); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB,ENABLE); GPIO_InitStructure.GPIO_Pin=GPIO_Pin_All; GPIO_InitStructure.GPIO_Mode=GPIO_Mode_Out_PP; GPIO_InitStructure.GPIO_Speed=GPIO_Speed_2MHz; GPIO_Init(GPIOB,&GPIO_InitStructure);
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参考答案:
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参考解析:
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