待机唤醒实验的困惑

xfaye

[mw_shl_code=c,true]void Sys_Enter_Standby(void) { while(WKUP_KD); //????WK_UP°??ü????(????RTC?????±,±?????WK_UP?????????????ú) RCC_AHB1PeriphResetCmd(0X04FF,ENABLE);//?????ù??IO?? [/mw_shl_code] [mw_shl_code=c,true] RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);//????PWR?±?? PWR_BackupAccessCmd(ENABLE);//?ó±????ò·??????? //???????????±????±??à??RTC???? RTC_ITConfig(RTC_IT_TS|RTC_IT_WUT|RTC_IT_ALRB|RTC_IT_ALRA,DISABLE);//??±?RTC?à??????????????RTC???é?ò?????? RTC_ClearITPendingBit(RTC_IT_TS|RTC_IT_WUT|RTC_IT_ALRB|RTC_IT_ALRA);//????RTC?à??????±ê?????? PWR_ClearFlag(PWR_FLAG_WU);//????Wake-up ±ê?? PWR_WakeUpPinCmd(ENABLE);//?è??WKUP???????? PWR_EnterSTANDBYMode(); //???????ú???? }[/mw_shl_code]

以上有行代码RCC_AHB1PeriphResetCmd(0X04FF,ENABLE);//复位所有I/O口。
0X04FF 代表是I/O吗？试着改了改这个数没看出结果的变化，原子哥0X04FF分别代表啥？

xfaye

查看数据手册之后：位0-位8分别对应PA-PH复位的话置1，位9-11保留，寄存器复位值为0X0000 0000 那么为什么位10变成1了呢？

正点原子

回复【5楼】xfaye:
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你可以设置为0

561787965

[mw_shl_code=c,true] /** * @brief Forces or releases AHB1 peripheral reset. * @param RCC_AHB1Periph: specifies the AHB1 peripheral to reset. * This parameter can be any combination of the following values: * @arg RCC_AHB1Periph_GPIOA: GPIOA clock * @arg RCC_AHB1Periph_GPIOB: GPIOB clock * @arg RCC_AHB1Periph_GPIOC: GPIOC clock * @arg RCC_AHB1Periph_GPIOD: GPIOD clock * @arg RCC_AHB1Periph_GPIOE: GPIOE clock * @arg RCC_AHB1Periph_GPIOF: GPIOF clock * @arg RCC_AHB1Periph_GPIOG: GPIOG clock * @arg RCC_AHB1Periph_GPIOG: GPIOG clock * @arg RCC_AHB1Periph_GPIOI: GPIOI clock * @arg RCC_AHB1Periph_GPIOJ: GPIOJ clock (STM32F42xxx/43xxx devices) * @arg RCC_AHB1Periph_GPIOK: GPIOK clock (STM32F42xxx/43xxxdevices) * @arg RCC_AHB1Periph_CRC: CRC clock * @arg RCC_AHB1Periph_DMA1: DMA1 clock * @arg RCC_AHB1Periph_DMA2: DMA2 clock * @arg RCC_AHB1Periph_DMA2D: DMA2D clock (STM32F429xx/439xx devices) * @arg RCC_AHB1Periph_ETH_MAC: Ethernet MAC clock * @arg RCC_AHB1Periph_OTG_HS: USB OTG HS clock * * @param NewState: new state of the specified peripheral reset. * This parameter can be: ENABLE or DISABLE. * @retval None */ void RCC_AHB1PeriphResetCmd(uint32_t RCC_AHB1Periph, FunctionalState NewState) { /* Check the parameters */ assert_param(IS_RCC_AHB1_RESET_PERIPH(RCC_AHB1Periph)); assert_param(IS_FUNCTIONAL_STATE(NewState)); if (NewState != DISABLE) { RCC->AHB1RSTR |= RCC_AHB1Periph; } else { RCC->AHB1RSTR &= ~RCC_AHB1Periph; } } [/mw_shl_code]

[mw_shl_code=c,true]#define RCC_AHB1Periph_GPIOA ((uint32_t)0x00000001) #define RCC_AHB1Periph_GPIOB ((uint32_t)0x00000002) #define RCC_AHB1Periph_GPIOC ((uint32_t)0x00000004) #define RCC_AHB1Periph_GPIOD ((uint32_t)0x00000008) #define RCC_AHB1Periph_GPIOE ((uint32_t)0x00000010) #define RCC_AHB1Periph_GPIOF ((uint32_t)0x00000020) #define RCC_AHB1Periph_GPIOG ((uint32_t)0x00000040) #define RCC_AHB1Periph_GPIOH ((uint32_t)0x00000080) #define RCC_AHB1Periph_GPIOI ((uint32_t)0x00000100) #define RCC_AHB1Periph_GPIOJ ((uint32_t)0x00000200) #define RCC_AHB1Periph_GPIOK ((uint32_t)0x00000400)[/mw_shl_code]

把所有十六进制的数转换成二进制，对比一下，就明白怎么回事了。

xfaye

按照你说的我计算了一下，STM32F4ZGT6的I/O直到PH， 复位所有的I/0就是把PA-PH全部置1，得到的结果是0X00FF，二原子哥的0X4FF是这样得出的：PA-PH置1，PI和PJ置0，PK置1，那么，我觉得这个地方应该修改为0X00FF。这样我说的是否合理？

xfaye

回复【2楼】561787965:
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按照你说的我计算了一下，STM32F4ZGT6的I/O直到PH， 复位所有的I/0就是把PA-PH全部置1，得到的结果是0X00FF，二原子哥的0X4FF是这样得出的：PA-PH置1，PI和PJ置0，PK置1，那么，我觉得这个地方应该修改为0X00FF。这样我说的是否合理？

佩奇宝宝

可以设置位0X00FF，