我想把SDA接的引腳改成PF4,奈何本人對寄存器所知不多，麻煩大佬幫忙看看....
#define SCCB_SDA_IN() {GPIOG->CRH&=0XFF0FFFFF;GPIOG->CRH|=0X00800000;}
#define SCCB_SDA_OUT() {GPIOG->CRH&=0XFF0FFFFF;GPIOG->CRH|=0X00300000;}
//IO操作函數
#define SCCB_SCL PDout(3) //SCL
#define SCCB_SDA PGout(13) //SDA
#define SCCB_READ_SDA PGin(13) //輸入SDA
#define SCCB_ID 0X42 //OV7670的ID
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