为什么其他所有的GPIO都可以使用RCC，但这个会出错？

Question

我正在为我的STM32F446RE编写简单的GPIO驱动程序，有趣的是，我遇到了一个问题。因此，我正在定义宏和一个结构来保存RCC的寄存器。GPIO的每个端口都指向RCC的寄存器，以连接到正确的总线。但是，当我试图将位设置为1时，GPIOB会给出以下错误：" error：'->‘(有’int‘)的无效类型参数“

#define GPIOB_PCLOCK_EN()       (RCC -> RCC_AHB1ENR |= (1 << 1)  )

typedef struct{
__vo    uint32_t RCC_CR;                //RCC clock control register
__vo    uint32_t RCC_PLLCFGR;           //RCC PLL configuration register
__vo    uint32_t RCC_CFGR;              //RCC clock configuration register
__vo    uint32_t RCC_CIR;               //RCC clock interrupt register
__vo    uint32_t RCC_AHB1RSTR;          //RCC AHB1 peripheral reset register
__vo    uint32_t RCC_AHB2RSTR;          //RCC AHB2 peripheral reset register
__vo    uint32_t RCC_AHB3RSTR;          //RCC AHB3 peripheral reset register
uint32_t RESERVED0;             //RESERVED
__vo    uint32_t RCC_APB1RSTR;          //RCC APB1 peripheral reset register
__vo    uint32_t RCC_APB2RSTR;          //RCC APB2 peripheral reset register
uint32_t RESERVED1[2];              //RESERVED
__vo    uint32_t RCC_AHB1ENR;           //RCC AHB1 peripheral clock enable register
__vo    uint32_t RCC_AHB2ENR;           //RCC AHB2 peripheral clock enable register
__vo    uint32_t RCC_AHB3ENR;           //RCC AHB3 peripheral clock enable register

__vo    uint32_t RCC_APB1ENR;           //RCC APB1 peripheral clock enable register
__vo    uint32_t RCC_APB2ENR;           //RCC APB2 peripheral clock enable register
uint32_t RESERVED2[2];              //RESERVED
__vo    uint32_t RCC_AHB1LPENR;         //RCC AHB1 peripheral clock enable in low power mode register
__vo    uint32_t RCC_AHB2LPENR;         //RCC AHB2 peripheral clock enable in low power mode register
__vo    uint32_t RCC_AHB3LPENR;         //RCC AHB3 peripheral clock enable in low power mode register
uint32_t RESERVED3;             //RESERVED
__vo    uint32_t RCC_APB1LPENR;         //RCC APB1 peripheral clock enable in low power mode register
__vo    uint32_t RCC_APB2LPENR;         //RCC APB2 peripheral clock enabled in low power mode register
uint32_t RESERVED4[2];              //RESERVED
__vo    uint32_t RCC_BDCR;              //RCC Backup domain control register
__vo    uint32_t RCC_CSR;               //RCC clock control & status register
uint32_t RESERVED5[2];              //RESERVED
__vo    uint32_t RCC_SSCGR;             //RCC spread spectrum clock generation register
__vo    uint32_t RCC_PLLI2SCFGR;        //RCC PLLI2S configuration register
__vo    uint32_t RCC_PLLSAICFGR;        //RCC PLL configuration register
__vo    uint32_t RCC_DCKCFGR;           //RCC Dedicated Clock Configuration Register
__vo    uint32_t CKGATENR;              //RCC clocks gated enable register
__vo    uint32_t DCKCFGR2;              //RCC dedicated clocks configuration register 2


}RCC_RegDef_t;

#define RCC     (RCC_RegDef_t*) RCC_BASEADDR


/*Clock Enable Presets For GPIAOs*/

#define GPIOA_PCLOCK_EN()       (RCC -> RCC_AHB1ENR |= (1 << 0)  )
//#define GPIOB_PCLOCK_EN           (RCC -> RCC_AHB1ENR |= (1 << 1)  )
#define GPIOC_PCLOCK_EN()       (RCC -> RCC_AHB1ENR |= (1 << 2)  )
#define GPIOD_PCLOCK_EN()       (RCC -> RCC_AHB1ENR |= (1 << 3)  )
#define GPIOE_PCLOCK_EN()       (RCC -> RCC_AHB1ENR |= (1 << 4)  )
#define GPIOF_PCLOCK_EN()       (RCC -> RCC_AHB1ENR |= (1 << 5)  )
#define GPIOG_PCLOCK_EN()       (RCC -> RCC_AHB1ENR |= (1 << 6)  )
#define GPIOH_PCLOCK_EN()       (RCC -> RCC_AHB1ENR |= (1 << 7)  )

Answer 1

您需要在RCC的替换文本周围加上括号，如下所示：

#define RCC ((RCC_RegDef_t*) RCC_BASEADDR)

表达式的先例是这样的，->比cast具有更高的优先级。

使用您的定义，编译器尝试使用->的LHS操作数作为指针，但它是一个整数。