[嵌入式]初出茅庐的小李第85篇博客之STM32寄存器操作模板编写

操作寄存器有

#1.GPIO  端口模式寄存器      (GPIOx_MODER)   (x = A..I)
#2.GPIO  端口输出类型寄存器  (GPIOx_OTYPER)  (x = A..I)
#3.GPIO  端口输出速度寄存器  (GPIOx_OSPEEDR) (x = A..I)
#4.GPIO  端口上拉/下拉寄存器 (GPIOx_PUPDR)   (x = A..I)
#5.GPIO  端口输入数据寄存器  (GPIOx_IDR)     (x = A..I)
#6.GPIO  端口输出数据寄存器  (GPIOx_ODR)     (x = A..I)
#7.GPIO  端口置位/复位寄存器 (GPIOx_BSRR)    (x = A..I)
#8.GPIO  端口配置锁定寄存器  (GPIOx_LCKR)    (x = A..I)
#9.GPIO  复用功能低位寄存器  (GPIOx_AFRL)    (x = A..I)
#10.GPIO 复用功能高位寄存器  (GPIOx_AFRH)    (x = A..I)

操作方法如下

/*
*******************************************************/
/*00：输入模式（复位状态） */
GPIOx->MODER   &= ~(0x3<<(2*PIN_NUM));
GPIOx->MODER   |=  (0x0<<(2*PIN_NUM));

/*01：通用输出模式*/
GPIOx->MODER   &= ~(0x3<<(2*PIN_NUM));
GPIOx->MODER   |=  (0x1<<(2*PIN_NUM));

/*10：复用功能模式*/
GPIOx->MODER   &= ~(0x3<<(2*PIN_NUM));
GPIOx->MODER   |=  (0x2<<(2*PIN_NUM));

/*11：模拟模式*/
GPIOx->MODER   &= ~(0x3<<(2*PIN_NUM));
GPIOx->MODER   |=  (0x3<<(2*PIN_NUM));


/*0：输出推挽（复位状态）*/
GPIOx->OTYPER  &= ~(0x1<<(PIN_NUM));
GPIOx->OTYPER  |=  (0x0<<(PIN_NUM));

/*1：输出开漏*/
GPIOx->OTYPER  &= ~(0x1<<(PIN_NUM));
GPIOx->OTYPER  |=  (0x0<<(PIN_NUM));


 


/*00：2 MHz（低速） */
GPIOx->OSPEEDR &= ~(0x3<<(2*PIN_NUM));
GPIOx->OSPEEDR |=  (0x0<<(2*PIN_NUM));
/*01：25 MHz（中速）*/
GPIOx->OSPEEDR &= ~(0x3<<(2*PIN_NUM));
GPIOx->OSPEEDR |=  (0x1<<(2*PIN_NUM));
/*10：50 MHz（快速） */
GPIOx->OSPEEDR &= ~(0x3<<(2*PIN_NUM));
GPIOx->OSPEEDR |=  (0x2<<(2*PIN_NUM));
/*11：30 pF 时为 100 MHz（高速）（15 pF 时为 80 MHz 输出（最大速度））*/
GPIOx->OSPEEDR &= ~(0x3<<(2*PIN_NUM));
GPIOx->OSPEEDR |=  (0x3<<(2*PIN_NUM));






/*00：无上拉或下拉 */
GPIOx->PUPDR   &= ~(0x3<<(2*PIN_NUM));
GPIOx->PUPDR   |=  (0x0<<(2*PIN_NUM));
/*01：上拉 */
GPIOx->PUPDR   &= ~(0x3<<(2*PIN_NUM));
GPIOx->PUPDR   |=  (0x1<<(2*PIN_NUM));
/*10：下拉 */
GPIOx->PUPDR   &= ~(0x3<<(2*PIN_NUM));
GPIOx->PUPDR   |=  (0x2<<(2*PIN_NUM));


/*测试输入寄存器值是否为1*/
((GPIOx->IDR&(0x1<<PIN_NUM))>>PIN_NUM))
/*复位输出寄存器值使其为0*/
GPIOx->ODR     &= ~(0x1<<PIN_NUM);
GPIOx->ODR     |=  (0x0<<PIN_NUM);
/*置位输出寄存器值使其为1*/
GPIOx->ODR     &= ~(0x1<<PIN_NUM);
GPIOx->ODR     |=  (0x1<<PIN_NUM);


/*1：对相应的 ODRx 位进行复位*/
GPIOx->BSRR    &= ~(0x1<<(16+PIN_NUM));
GPIOx->BSRR    |=  (0x1<<(16+PIN_NUM));

/*1：对相应的 ODRx 位进行置位*/
GPIOx->BSRR    &= ~(0x1<<PIN_NUM);
GPIOx->BSRR    |=  (0x1<<PIN_NUM);



/*0：端口配置锁定键未激活。*/ 
GPIOx->AFRL    &= ~(0x1<<16);
GPIOx->AFRH    &=  (0x0<<16);
/*1：端口配置锁定键已激活。直到 MCU 复位时，才锁定 GPIOx_LCKR 寄存器*/
GPIOx->LCKR    &= ~(0x1<<16);
GPIOx->LCKR    |=  (0x1<<16);

/*端口 x 的复用功能选择  (PIN_NUM = 0..7) AF_NUM = (0000 - 1111)*/
GPIOx->AFRL    &= ~(0xf<<(4*PIN_NUM));
GPIOx->AFRL    |=  ((AF_NUM)<<(4*PIN_NUM));

/*端口 x 的复用功能选择  (PIN_NUM = 8..15) AF_NUM = (0000 - 1111)*/
GPIOx->AFRH    &= ~(0xf<<(4*(PIN_NUM-8)));
GPIOx->AFRH    |=  ((AF_NUM)<<(4*(PIN_NUM-8)));