STM32F103标准库实战速查指南按场景快速定位关键函数刚接触STM32开发时面对数百个库函数和复杂的寄存器配置很多工程师都会陷入该用哪个函数参数怎么填的困境。本文不是简单的函数列表堆砌而是从实际项目场景出发将标准库中最常用、最易错的API按功能模块重新组织配合典型代码片段和参数说明让你在开发中快速找到解决方案。1. GPIO配置从基础操作到高级应用GPIO是STM32开发中最基础也最常用的模块。很多新手会直接调用GPIO_SetBits/GPIO_ResetBits却忽略了更高效的配置方式。以下按使用场景分类1.1 基础输入输出初始化配置必须设置时钟和引脚模式// 启用GPIOA时钟 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); GPIO_InitTypeDef GPIO_InitStruct; GPIO_InitStruct.GPIO_Pin GPIO_Pin_5; // PA5 GPIO_InitStruct.GPIO_Mode GPIO_Mode_Out_PP; // 推挽输出 GPIO_InitStruct.GPIO_Speed GPIO_Speed_50MHz; GPIO_Init(GPIOA, GPIO_InitStruct);快速操作GPIO_SetBits(GPIOA, GPIO_Pin_5)输出高电平GPIO_ResetBits(GPIOA, GPIO_Pin_5)输出低电平GPIO_WriteBit(GPIOA, GPIO_Pin_5, Bit_SET)带状态检查的写入注意输出模式选择GPIO_Mode_Out_PP(推挽)还是GPIO_Mode_Out_OD(开漏)取决于驱动电路设计1.2 中断与事件触发外部中断配置需要联动NVIC模块// 配置EXTI线 GPIO_InitStruct.GPIO_Pin GPIO_Pin_0; GPIO_InitStruct.GPIO_Mode GPIO_Mode_IPU; // 上拉输入 GPIO_Init(GPIOA, GPIO_InitStruct); GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0); EXTI_InitTypeDef EXTI_InitStruct; EXTI_InitStruct.EXTI_Line EXTI_Line0; EXTI_InitStruct.EXTI_Mode EXTI_Mode_Interrupt; EXTI_InitStruct.EXTI_Trigger EXTI_Trigger_Rising; // 上升沿触发 EXTI_InitStruct.EXTI_LineCmd ENABLE; EXTI_Init(EXTI_InitStruct); // 配置NVIC NVIC_InitTypeDef NVIC_InitStruct; NVIC_InitStruct.NVIC_IRQChannel EXTI0_IRQn; NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority 0x0F; NVIC_InitStruct.NVIC_IRQChannelSubPriority 0x0F; NVIC_InitStruct.NVIC_IRQChannelCmd ENABLE; NVIC_Init(NVIC_InitStruct);2. 定时器应用PWM生成与输入捕获定时器是STM32最强大的外设之一以下是两种典型场景2.1 PWM信号生成配置TIM3的通道1输出PWM// 时钟使能 RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); // GPIO配置 GPIO_InitStruct.GPIO_Pin GPIO_Pin_6; // PA6对应TIM3_CH1 GPIO_InitStruct.GPIO_Mode GPIO_Mode_AF_PP; GPIO_InitStruct.GPIO_Speed GPIO_Speed_50MHz; GPIO_Init(GPIOA, GPIO_InitStruct); // 定时器基础配置 TIM_TimeBaseInitTypeDef TIM_TimeBaseStruct; TIM_TimeBaseStruct.TIM_Period 999; // 自动重装载值 TIM_TimeBaseStruct.TIM_Prescaler 71; // 72MHz/(711)1MHz TIM_TimeBaseStruct.TIM_ClockDivision 0; TIM_TimeBaseStruct.TIM_CounterMode TIM_CounterMode_Up; TIM_TimeBaseInit(TIM3, TIM_TimeBaseStruct); // PWM通道配置 TIM_OCInitTypeDef TIM_OCStruct; TIM_OCStruct.TIM_OCMode TIM_OCMode_PWM1; TIM_OCStruct.TIM_OutputState TIM_OutputState_Enable; TIM_OCStruct.TIM_Pulse 500; // 初始占空比50% TIM_OCStruct.TIM_OCPolarity TIM_OCPolarity_High; TIM_OC1Init(TIM3, TIM_OCStruct); TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable); TIM_Cmd(TIM3, ENABLE);动态调整占空比TIM_SetCompare1(TIM3, 750); // 修改为75%占空比2.2 输入捕获测频率测量TIM2通道1的输入信号频率TIM_ICInitTypeDef TIM_ICInitStruct; TIM_ICInitStruct.TIM_Channel TIM_Channel_1; TIM_ICInitStruct.TIM_ICPolarity TIM_ICPolarity_Rising; TIM_ICInitStruct.TIM_ICSelection TIM_ICSelection_DirectTI; TIM_ICInitStruct.TIM_ICPrescaler TIM_ICPSC_DIV1; TIM_ICInitStruct.TIM_ICFilter 0x0; TIM_ICInit(TIM2, TIM_ICInitStruct); // 配置捕获中断 TIM_ITConfig(TIM2, TIM_IT_CC1, ENABLE); NVIC_EnableIRQ(TIM2_IRQn); TIM_Cmd(TIM2, ENABLE);中断服务程序中计算频率void TIM2_IRQHandler(void) { static uint32_t last_capture 0; if(TIM_GetITStatus(TIM2, TIM_IT_CC1) ! RESET) { uint32_t current_capture TIM_GetCapture1(TIM2); uint32_t period current_capture - last_capture; float frequency 72000000.0 / (period * (TIM2-PSC 1)); last_capture current_capture; TIM_ClearITPendingBit(TIM2, TIM_IT_CC1); } }3. ADC采样单通道与多通道扫描3.1 单次采样配置ADC1通道1单次采样RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_GPIOA, ENABLE); // GPIO配置 GPIO_InitStruct.GPIO_Pin GPIO_Pin_1; GPIO_InitStruct.GPIO_Mode GPIO_Mode_AIN; GPIO_Init(GPIOA, GPIO_InitStruct); // ADC配置 ADC_InitTypeDef ADC_InitStruct; ADC_InitStruct.ADC_Mode ADC_Mode_Independent; ADC_InitStruct.ADC_ScanConvMode DISABLE; ADC_InitStruct.ADC_ContinuousConvMode DISABLE; ADC_InitStruct.ADC_ExternalTrigConv ADC_ExternalTrigConv_None; ADC_InitStruct.ADC_DataAlign ADC_DataAlign_Right; ADC_InitStruct.ADC_NbrOfChannel 1; ADC_Init(ADC1, ADC_InitStruct); // 通道配置 ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_55Cycles5); ADC_Cmd(ADC1, ENABLE); // 开始转换 ADC_ResetCalibration(ADC1); while(ADC_GetResetCalibrationStatus(ADC1)); ADC_StartCalibration(ADC1); while(ADC_GetCalibrationStatus(ADC1)); ADC_SoftwareStartConvCmd(ADC1, ENABLE); while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC)); uint16_t adc_value ADC_GetConversionValue(ADC1);3.2 多通道DMA传输使用DMA自动传输3个通道的采样值__IO uint16_t ADC_ConvertedValue[3]; // DMA配置 DMA_InitTypeDef DMA_InitStruct; DMA_InitStruct.DMA_PeripheralBaseAddr (uint32_t)ADC1-DR; DMA_InitStruct.DMA_MemoryBaseAddr (uint32_t)ADC_ConvertedValue; DMA_InitStruct.DMA_DIR DMA_DIR_PeripheralSRC; DMA_InitStruct.DMA_BufferSize 3; DMA_InitStruct.DMA_PeripheralInc DMA_PeripheralInc_Disable; DMA_InitStruct.DMA_MemoryInc DMA_MemoryInc_Enable; DMA_InitStruct.DMA_PeripheralDataSize DMA_PeripheralDataSize_HalfWord; DMA_InitStruct.DMA_MemoryDataSize DMA_MemoryDataSize_HalfWord; DMA_InitStruct.DMA_Mode DMA_Mode_Circular; DMA_InitStruct.DMA_Priority DMA_Priority_High; DMA_InitStruct.DMA_M2M DMA_M2M_Disable; DMA_Init(DMA1_Channel1, DMA_InitStruct); DMA_Cmd(DMA1_Channel1, ENABLE); // ADC多通道配置 ADC_InitStruct.ADC_ScanConvMode ENABLE; ADC_InitStruct.ADC_ContinuousConvMode ENABLE; ADC_Init(ADC1, ADC_InitStruct); ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_55Cycles5); ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 2, ADC_SampleTime_55Cycles5); ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 3, ADC_SampleTime_55Cycles5); ADC_DMACmd(ADC1, ENABLE); ADC_Cmd(ADC1, ENABLE); // 启动连续转换 ADC_SoftwareStartConvCmd(ADC1, ENABLE);4. 通信接口USART与SPI实战4.1 USART中断接收配置USART1中断接收// GPIO配置 GPIO_InitStruct.GPIO_Pin GPIO_Pin_9; // TX GPIO_InitStruct.GPIO_Mode GPIO_Mode_AF_PP; GPIO_InitStruct.GPIO_Speed GPIO_Speed_50MHz; GPIO_Init(GPIOA, GPIO_InitStruct); GPIO_InitStruct.GPIO_Pin GPIO_Pin_10; // RX GPIO_InitStruct.GPIO_Mode GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOA, GPIO_InitStruct); // USART配置 USART_InitTypeDef USART_InitStruct; USART_InitStruct.USART_BaudRate 115200; USART_InitStruct.USART_WordLength USART_WordLength_8b; USART_InitStruct.USART_StopBits USART_StopBits_1; USART_InitStruct.USART_Parity USART_Parity_No; USART_InitStruct.USART_HardwareFlowControl USART_HardwareFlowControl_None; USART_InitStruct.USART_Mode USART_Mode_Rx | USART_Mode_Tx; USART_Init(USART1, USART_InitStruct); // 使能接收中断 USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); NVIC_EnableIRQ(USART1_IRQn); USART_Cmd(USART1, ENABLE);中断服务程序处理void USART1_IRQHandler(void) { if(USART_GetITStatus(USART1, USART_IT_RXNE) ! RESET) { uint8_t data USART_ReceiveData(USART1); // 处理接收数据 USART_SendData(USART1, data); // 回传 while(USART_GetFlagStatus(USART1, USART_FLAG_TC) RESET); USART_ClearITPendingBit(USART1, USART_IT_RXNE); } }4.2 SPI全双工通信SPI1主模式全双工通信// GPIO配置 GPIO_InitStruct.GPIO_Pin GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7; // SCK/MISO/MOSI GPIO_InitStruct.GPIO_Mode GPIO_Mode_AF_PP; GPIO_InitStruct.GPIO_Speed GPIO_Speed_50MHz; GPIO_Init(GPIOA, GPIO_InitStruct); // SPI配置 SPI_InitTypeDef SPI_InitStruct; SPI_InitStruct.SPI_Direction SPI_Direction_2Lines_FullDuplex; SPI_InitStruct.SPI_Mode SPI_Mode_Master; SPI_InitStruct.SPI_DataSize SPI_DataSize_8b; SPI_InitStruct.SPI_CPOL SPI_CPOL_Low; SPI_InitStruct.SPI_CPHA SPI_CPHA_1Edge; SPI_InitStruct.SPI_NSS SPI_NSS_Soft; SPI_InitStruct.SPI_BaudRatePrescaler SPI_BaudRatePrescaler_8; SPI_InitStruct.SPI_FirstBit SPI_FirstBit_MSB; SPI_InitStruct.SPI_CRCPolynomial 7; SPI_Init(SPI1, SPI_InitStruct); SPI_Cmd(SPI1, ENABLE); // 发送并接收数据 uint8_t SPI_Transfer(uint8_t data) { while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) RESET); SPI_I2S_SendData(SPI1, data); while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) RESET); return SPI_I2S_ReceiveData(SPI1); }
别再死记硬背了！用这份STM32F103标准库函数速查表，快速定位GPIO、TIM、ADC等常用API
STM32F103标准库实战速查指南按场景快速定位关键函数刚接触STM32开发时面对数百个库函数和复杂的寄存器配置很多工程师都会陷入该用哪个函数参数怎么填的困境。本文不是简单的函数列表堆砌而是从实际项目场景出发将标准库中最常用、最易错的API按功能模块重新组织配合典型代码片段和参数说明让你在开发中快速找到解决方案。1. GPIO配置从基础操作到高级应用GPIO是STM32开发中最基础也最常用的模块。很多新手会直接调用GPIO_SetBits/GPIO_ResetBits却忽略了更高效的配置方式。以下按使用场景分类1.1 基础输入输出初始化配置必须设置时钟和引脚模式// 启用GPIOA时钟 RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); GPIO_InitTypeDef GPIO_InitStruct; GPIO_InitStruct.GPIO_Pin GPIO_Pin_5; // PA5 GPIO_InitStruct.GPIO_Mode GPIO_Mode_Out_PP; // 推挽输出 GPIO_InitStruct.GPIO_Speed GPIO_Speed_50MHz; GPIO_Init(GPIOA, GPIO_InitStruct);快速操作GPIO_SetBits(GPIOA, GPIO_Pin_5)输出高电平GPIO_ResetBits(GPIOA, GPIO_Pin_5)输出低电平GPIO_WriteBit(GPIOA, GPIO_Pin_5, Bit_SET)带状态检查的写入注意输出模式选择GPIO_Mode_Out_PP(推挽)还是GPIO_Mode_Out_OD(开漏)取决于驱动电路设计1.2 中断与事件触发外部中断配置需要联动NVIC模块// 配置EXTI线 GPIO_InitStruct.GPIO_Pin GPIO_Pin_0; GPIO_InitStruct.GPIO_Mode GPIO_Mode_IPU; // 上拉输入 GPIO_Init(GPIOA, GPIO_InitStruct); GPIO_EXTILineConfig(GPIO_PortSourceGPIOA, GPIO_PinSource0); EXTI_InitTypeDef EXTI_InitStruct; EXTI_InitStruct.EXTI_Line EXTI_Line0; EXTI_InitStruct.EXTI_Mode EXTI_Mode_Interrupt; EXTI_InitStruct.EXTI_Trigger EXTI_Trigger_Rising; // 上升沿触发 EXTI_InitStruct.EXTI_LineCmd ENABLE; EXTI_Init(EXTI_InitStruct); // 配置NVIC NVIC_InitTypeDef NVIC_InitStruct; NVIC_InitStruct.NVIC_IRQChannel EXTI0_IRQn; NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority 0x0F; NVIC_InitStruct.NVIC_IRQChannelSubPriority 0x0F; NVIC_InitStruct.NVIC_IRQChannelCmd ENABLE; NVIC_Init(NVIC_InitStruct);2. 定时器应用PWM生成与输入捕获定时器是STM32最强大的外设之一以下是两种典型场景2.1 PWM信号生成配置TIM3的通道1输出PWM// 时钟使能 RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM3, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); // GPIO配置 GPIO_InitStruct.GPIO_Pin GPIO_Pin_6; // PA6对应TIM3_CH1 GPIO_InitStruct.GPIO_Mode GPIO_Mode_AF_PP; GPIO_InitStruct.GPIO_Speed GPIO_Speed_50MHz; GPIO_Init(GPIOA, GPIO_InitStruct); // 定时器基础配置 TIM_TimeBaseInitTypeDef TIM_TimeBaseStruct; TIM_TimeBaseStruct.TIM_Period 999; // 自动重装载值 TIM_TimeBaseStruct.TIM_Prescaler 71; // 72MHz/(711)1MHz TIM_TimeBaseStruct.TIM_ClockDivision 0; TIM_TimeBaseStruct.TIM_CounterMode TIM_CounterMode_Up; TIM_TimeBaseInit(TIM3, TIM_TimeBaseStruct); // PWM通道配置 TIM_OCInitTypeDef TIM_OCStruct; TIM_OCStruct.TIM_OCMode TIM_OCMode_PWM1; TIM_OCStruct.TIM_OutputState TIM_OutputState_Enable; TIM_OCStruct.TIM_Pulse 500; // 初始占空比50% TIM_OCStruct.TIM_OCPolarity TIM_OCPolarity_High; TIM_OC1Init(TIM3, TIM_OCStruct); TIM_OC1PreloadConfig(TIM3, TIM_OCPreload_Enable); TIM_Cmd(TIM3, ENABLE);动态调整占空比TIM_SetCompare1(TIM3, 750); // 修改为75%占空比2.2 输入捕获测频率测量TIM2通道1的输入信号频率TIM_ICInitTypeDef TIM_ICInitStruct; TIM_ICInitStruct.TIM_Channel TIM_Channel_1; TIM_ICInitStruct.TIM_ICPolarity TIM_ICPolarity_Rising; TIM_ICInitStruct.TIM_ICSelection TIM_ICSelection_DirectTI; TIM_ICInitStruct.TIM_ICPrescaler TIM_ICPSC_DIV1; TIM_ICInitStruct.TIM_ICFilter 0x0; TIM_ICInit(TIM2, TIM_ICInitStruct); // 配置捕获中断 TIM_ITConfig(TIM2, TIM_IT_CC1, ENABLE); NVIC_EnableIRQ(TIM2_IRQn); TIM_Cmd(TIM2, ENABLE);中断服务程序中计算频率void TIM2_IRQHandler(void) { static uint32_t last_capture 0; if(TIM_GetITStatus(TIM2, TIM_IT_CC1) ! RESET) { uint32_t current_capture TIM_GetCapture1(TIM2); uint32_t period current_capture - last_capture; float frequency 72000000.0 / (period * (TIM2-PSC 1)); last_capture current_capture; TIM_ClearITPendingBit(TIM2, TIM_IT_CC1); } }3. ADC采样单通道与多通道扫描3.1 单次采样配置ADC1通道1单次采样RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_GPIOA, ENABLE); // GPIO配置 GPIO_InitStruct.GPIO_Pin GPIO_Pin_1; GPIO_InitStruct.GPIO_Mode GPIO_Mode_AIN; GPIO_Init(GPIOA, GPIO_InitStruct); // ADC配置 ADC_InitTypeDef ADC_InitStruct; ADC_InitStruct.ADC_Mode ADC_Mode_Independent; ADC_InitStruct.ADC_ScanConvMode DISABLE; ADC_InitStruct.ADC_ContinuousConvMode DISABLE; ADC_InitStruct.ADC_ExternalTrigConv ADC_ExternalTrigConv_None; ADC_InitStruct.ADC_DataAlign ADC_DataAlign_Right; ADC_InitStruct.ADC_NbrOfChannel 1; ADC_Init(ADC1, ADC_InitStruct); // 通道配置 ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_55Cycles5); ADC_Cmd(ADC1, ENABLE); // 开始转换 ADC_ResetCalibration(ADC1); while(ADC_GetResetCalibrationStatus(ADC1)); ADC_StartCalibration(ADC1); while(ADC_GetCalibrationStatus(ADC1)); ADC_SoftwareStartConvCmd(ADC1, ENABLE); while(!ADC_GetFlagStatus(ADC1, ADC_FLAG_EOC)); uint16_t adc_value ADC_GetConversionValue(ADC1);3.2 多通道DMA传输使用DMA自动传输3个通道的采样值__IO uint16_t ADC_ConvertedValue[3]; // DMA配置 DMA_InitTypeDef DMA_InitStruct; DMA_InitStruct.DMA_PeripheralBaseAddr (uint32_t)ADC1-DR; DMA_InitStruct.DMA_MemoryBaseAddr (uint32_t)ADC_ConvertedValue; DMA_InitStruct.DMA_DIR DMA_DIR_PeripheralSRC; DMA_InitStruct.DMA_BufferSize 3; DMA_InitStruct.DMA_PeripheralInc DMA_PeripheralInc_Disable; DMA_InitStruct.DMA_MemoryInc DMA_MemoryInc_Enable; DMA_InitStruct.DMA_PeripheralDataSize DMA_PeripheralDataSize_HalfWord; DMA_InitStruct.DMA_MemoryDataSize DMA_MemoryDataSize_HalfWord; DMA_InitStruct.DMA_Mode DMA_Mode_Circular; DMA_InitStruct.DMA_Priority DMA_Priority_High; DMA_InitStruct.DMA_M2M DMA_M2M_Disable; DMA_Init(DMA1_Channel1, DMA_InitStruct); DMA_Cmd(DMA1_Channel1, ENABLE); // ADC多通道配置 ADC_InitStruct.ADC_ScanConvMode ENABLE; ADC_InitStruct.ADC_ContinuousConvMode ENABLE; ADC_Init(ADC1, ADC_InitStruct); ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 1, ADC_SampleTime_55Cycles5); ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 2, ADC_SampleTime_55Cycles5); ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 3, ADC_SampleTime_55Cycles5); ADC_DMACmd(ADC1, ENABLE); ADC_Cmd(ADC1, ENABLE); // 启动连续转换 ADC_SoftwareStartConvCmd(ADC1, ENABLE);4. 通信接口USART与SPI实战4.1 USART中断接收配置USART1中断接收// GPIO配置 GPIO_InitStruct.GPIO_Pin GPIO_Pin_9; // TX GPIO_InitStruct.GPIO_Mode GPIO_Mode_AF_PP; GPIO_InitStruct.GPIO_Speed GPIO_Speed_50MHz; GPIO_Init(GPIOA, GPIO_InitStruct); GPIO_InitStruct.GPIO_Pin GPIO_Pin_10; // RX GPIO_InitStruct.GPIO_Mode GPIO_Mode_IN_FLOATING; GPIO_Init(GPIOA, GPIO_InitStruct); // USART配置 USART_InitTypeDef USART_InitStruct; USART_InitStruct.USART_BaudRate 115200; USART_InitStruct.USART_WordLength USART_WordLength_8b; USART_InitStruct.USART_StopBits USART_StopBits_1; USART_InitStruct.USART_Parity USART_Parity_No; USART_InitStruct.USART_HardwareFlowControl USART_HardwareFlowControl_None; USART_InitStruct.USART_Mode USART_Mode_Rx | USART_Mode_Tx; USART_Init(USART1, USART_InitStruct); // 使能接收中断 USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); NVIC_EnableIRQ(USART1_IRQn); USART_Cmd(USART1, ENABLE);中断服务程序处理void USART1_IRQHandler(void) { if(USART_GetITStatus(USART1, USART_IT_RXNE) ! RESET) { uint8_t data USART_ReceiveData(USART1); // 处理接收数据 USART_SendData(USART1, data); // 回传 while(USART_GetFlagStatus(USART1, USART_FLAG_TC) RESET); USART_ClearITPendingBit(USART1, USART_IT_RXNE); } }4.2 SPI全双工通信SPI1主模式全双工通信// GPIO配置 GPIO_InitStruct.GPIO_Pin GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7; // SCK/MISO/MOSI GPIO_InitStruct.GPIO_Mode GPIO_Mode_AF_PP; GPIO_InitStruct.GPIO_Speed GPIO_Speed_50MHz; GPIO_Init(GPIOA, GPIO_InitStruct); // SPI配置 SPI_InitTypeDef SPI_InitStruct; SPI_InitStruct.SPI_Direction SPI_Direction_2Lines_FullDuplex; SPI_InitStruct.SPI_Mode SPI_Mode_Master; SPI_InitStruct.SPI_DataSize SPI_DataSize_8b; SPI_InitStruct.SPI_CPOL SPI_CPOL_Low; SPI_InitStruct.SPI_CPHA SPI_CPHA_1Edge; SPI_InitStruct.SPI_NSS SPI_NSS_Soft; SPI_InitStruct.SPI_BaudRatePrescaler SPI_BaudRatePrescaler_8; SPI_InitStruct.SPI_FirstBit SPI_FirstBit_MSB; SPI_InitStruct.SPI_CRCPolynomial 7; SPI_Init(SPI1, SPI_InitStruct); SPI_Cmd(SPI1, ENABLE); // 发送并接收数据 uint8_t SPI_Transfer(uint8_t data) { while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) RESET); SPI_I2S_SendData(SPI1, data); while(SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) RESET); return SPI_I2S_ReceiveData(SPI1); }
