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发表于 2015-11-4 14:54:31
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以前我遇到过类似的情况,比如刚开始引脚是配置为USART功能,后来切换成SPI引脚就不干活了,不知道怎么回事。
做IO功能切换的时候,调用这个时钟复位函数试试看- /**
- * @brief Forces or releases High Speed APB (APB2) peripheral reset.
- * @param RCC_APB2Periph: specifies the APB2 peripheral to reset.
- * This parameter can be any combination of the following values:
- * @arg RCC_APB2Periph_AFIO, RCC_APB2Periph_GPIOA, RCC_APB2Periph_GPIOB,
- * RCC_APB2Periph_GPIOC, RCC_APB2Periph_GPIOD, RCC_APB2Periph_GPIOE,
- * RCC_APB2Periph_GPIOF, RCC_APB2Periph_GPIOG, RCC_APB2Periph_ADC1,
- * RCC_APB2Periph_ADC2, RCC_APB2Periph_TIM1, RCC_APB2Periph_SPI1,
- * RCC_APB2Periph_TIM8, RCC_APB2Periph_USART1, RCC_APB2Periph_ADC3,
- * RCC_APB2Periph_TIM15, RCC_APB2Periph_TIM16, RCC_APB2Periph_TIM17,
- * RCC_APB2Periph_TIM9, RCC_APB2Periph_TIM10, RCC_APB2Periph_TIM11
- * @param NewState: new state of the specified peripheral reset.
- * This parameter can be: ENABLE or DISABLE.
- * @retval None
- */
- void RCC_APB2PeriphResetCmd(uint32_t RCC_APB2Periph, FunctionalState NewState)
- {
- /* Check the parameters */
- assert_param(IS_RCC_APB2_PERIPH(RCC_APB2Periph));
- assert_param(IS_FUNCTIONAL_STATE(NewState));
- if (NewState != DISABLE)
- {
- RCC->APB2RSTR |= RCC_APB2Periph;
- }
- else
- {
- RCC->APB2RSTR &= ~RCC_APB2Periph;
- }
- }
- /**
- * @brief Forces or releases Low Speed APB (APB1) peripheral reset.
- * @param RCC_APB1Periph: specifies the APB1 peripheral to reset.
- * This parameter can be any combination of the following values:
- * @arg RCC_APB1Periph_TIM2, RCC_APB1Periph_TIM3, RCC_APB1Periph_TIM4,
- * RCC_APB1Periph_TIM5, RCC_APB1Periph_TIM6, RCC_APB1Periph_TIM7,
- * RCC_APB1Periph_WWDG, RCC_APB1Periph_SPI2, RCC_APB1Periph_SPI3,
- * RCC_APB1Periph_USART2, RCC_APB1Periph_USART3, RCC_APB1Periph_USART4,
- * RCC_APB1Periph_USART5, RCC_APB1Periph_I2C1, RCC_APB1Periph_I2C2,
- * RCC_APB1Periph_USB, RCC_APB1Periph_CAN1, RCC_APB1Periph_BKP,
- * RCC_APB1Periph_PWR, RCC_APB1Periph_DAC, RCC_APB1Periph_CEC,
- * RCC_APB1Periph_TIM12, RCC_APB1Periph_TIM13, RCC_APB1Periph_TIM14
- * @param NewState: new state of the specified peripheral clock.
- * This parameter can be: ENABLE or DISABLE.
- * @retval None
- */
- void RCC_APB1PeriphResetCmd(uint32_t RCC_APB1Periph, FunctionalState NewState)
- {
- /* Check the parameters */
- assert_param(IS_RCC_APB1_PERIPH(RCC_APB1Periph));
- assert_param(IS_FUNCTIONAL_STATE(NewState));
- if (NewState != DISABLE)
- {
- RCC->APB1RSTR |= RCC_APB1Periph;
- }
- else
- {
- RCC->APB1RSTR &= ~RCC_APB1Periph;
- }
- }
复制代码 比如串口的的复位:
- /**
- * @brief Deinitializes the USARTx peripheral registers to their default reset values.
- * @param USARTx: Select the USART or the UART peripheral.
- * This parameter can be one of the following values:
- * USART1, USART2, USART3, UART4 or UART5.
- * @retval None
- */
- void USART_DeInit(USART_TypeDef* USARTx)
- {
- /* Check the parameters */
- assert_param(IS_USART_ALL_PERIPH(USARTx));
- if (USARTx == USART1)
- {
- RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, ENABLE);
- RCC_APB2PeriphResetCmd(RCC_APB2Periph_USART1, DISABLE);
- }
- else if (USARTx == USART2)
- {
- RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, ENABLE);
- RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2, DISABLE);
- }
- else if (USARTx == USART3)
- {
- RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, ENABLE);
- RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART3, DISABLE);
- }
- else if (USARTx == UART4)
- {
- RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART4, ENABLE);
- RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART4, DISABLE);
- }
- else
- {
- if (USARTx == UART5)
- {
- RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART5, ENABLE);
- RCC_APB1PeriphResetCmd(RCC_APB1Periph_UART5, DISABLE);
- }
- }
- }
复制代码 |
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