如果现在用GPIOF口连接led灯,用GPIOB连接按键,下面的指令如何修改RCC_AHB1PeriphClockCmd ( RCC_AHB1Periph_GPIOB, ENABLE);
A. RCC_AHB1PeriphClockCmd ( RCC_AHB1Periph_GPIOB, ENABLE);
B. RCC_AHB1PeriphClockCmd ( RCC_AHB1Periph_GPIOF, ENABLE);
C. RCC_AHB1PeriphClockCmd ( RCC_AHB1Periph_GPIOB|RCC_AHB1Periph_GPIOF, ENABLE);
D. RCC_AHB1PeriphClockCmd ( RCC_AHB1Periph_GPIOB|RCC_AHB1Periph_GPIOF, DISNABLE);