void myUSART_Init() { RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE); GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_USART1); GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_USART1); GPIO_InitTypeDef GPIO_InitStructure; GPIO_InitStructure.GPIO_Mode =GPIO_Mode_AF; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOB,&GPIO_InitStructure); USART_InitTypeDef USART_InitStuctyre; USART_InitStuctyre.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; USART_InitStuctyre.USART_Parity = USART_Parity_No; USART_InitStuctyre.USART_StopBits = USART_StopBits_1; USART_InitStuctyre.USART_BaudRate = 9600; USART_InitStuctyre.USART_WordLength = USART_WordLength_8b; USART_InitStuctyre.USART_HardwareFlowControl =USART_HardwareFlowControl_None; USART_Init(USART1,&USART_InitStuctyre); USART_Cmd(USART1,ENABLE); USART_ITConfig(USART1,USART_IT_TXE,ENABLE); NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); NVIC_InitTypeDef NVIC_InitStructure; NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3; NVIC_Init(&NVIC_InitStructure); } void myUSARTsend_Byte(uint16_t Byte) { USART_SendData(USART1,Byte); while(USART_GetFlagStatus(USART1,USART_FLAG_TXE)==RESET); } void myUSARTsend_Array(uint8_t *Array,uint16_t Length) { uint16_t i; for(i=0;i<=Length;i++) { myUSARTsend_Byte(Array[i]); } }

时间: 2023-09-03 12:10:12 浏览: 54
这是一个使用 STM32F4 的 USART1 进行串口通信的初始化和发送函数的示例代码。 ```c void myUSART_Init() { RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE); GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_USART1); GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_USART1); GPIO_InitTypeDef GPIO_InitStructure; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStructure); USART_InitTypeDef USART_InitStructure; USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; USART_InitStructure.USART_Parity = USART_Parity_No; USART_InitStructure.USART_StopBits = USART_StopBits_1; USART_InitStructure.USART_BaudRate = 9600; USART_InitStructure.USART_WordLength = USART_WordLength_8b; USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_Init(USART1, &USART_InitStructure); USART_Cmd(USART1, ENABLE); USART_ITConfig(USART1, USART_IT_TXE, ENABLE); NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); NVIC_InitTypeDef NVIC_InitStructure; NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3; NVIC_Init(&NVIC_InitStructure); } void myUSARTsend_Byte(uint16_t Byte) { USART_SendData(USART1, Byte); while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET); } void myUSARTsend_Array(uint8_t *Array, uint16_t Length) { uint16_t i; for (i = 0; i < Length; i++) { myUSARTsend_Byte(Array[i]); } } ``` `myUSART_Init()` 函数用于初始化 USART1,配置相关的 GPIO 和 USART 参数。`myUSARTsend_Byte()` 函数用于发送一个字节的数据,`myUSARTsend_Array()` 函数用于发送一个字节数组。 请注意,这只是一个简单的示例,你可能需要根据你的具体需求进行适当的修改。另外,还需要在程序中定义 USART1 的中断处理函数 `USART1_IRQHandler()` 来处理接收中断和其他相关操作。

相关推荐

RCC_AHB1PeriphClockCmd和RCC_APB2PeriphClockCmd是用于STM32系列微控制器的RCC(Reset and Clock Control)模块的函数。 RCC_AHB1PeriphClockCmd函数用于使能或禁用AHB1总线上的外设时钟。AHB1总线上的外设包括GPIO端口、DMA、CRC等。函数原型如下: c void RCC_AHB1PeriphClockCmd(uint32_t RCC_AHB1Periph, FunctionalState NewState); 其中,RCC_AHB1Periph参数指定要使能或禁用的外设,可以使用逻辑或运算符(|)同时指定多个外设。NewState参数指定要设置的状态,可以是ENABLE(使能)或DISABLE(禁用)。 例如,要使能GPIOA和GPIOB的时钟,可以使用以下代码: c RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOB, ENABLE); RCC_APB2PeriphClockCmd函数用于使能或禁用APB2总线上的外设时钟。APB2总线上的外设包括USART、SPI、ADC等。函数原型如下: c void RCC_APB2PeriphClockCmd(uint32_t RCC_APB2Periph, FunctionalState NewState); 其中,RCC_APB2Periph参数指定要使能或禁用的外设,可以使用逻辑或运算符(|)同时指定多个外设。NewState参数指定要设置的状态,可以是ENABLE(使能)或DISABLE(禁用)。 例如,要使能USART1和SPI1的时钟,可以使用以下代码: c RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_SPI1, ENABLE); 需要注意的是,具体使用哪个函数取决于外设所连接的总线。AHB1总线连接的外设使用RCC_AHB1PeriphClockCmd函数,而APB2总线连接的外设使用RCC_APB2PeriphClockCmd函数。请根据具体的外设和总线类型选择适当的函数。
当将代码从STM32F103C8T6更改为STM32F4ZET6时,需要注意以下几点: 1. 更改头文件引用:包含正确的头文件。例如,将#include "stm32f10x_gpio.h"更改为#include "stm32f4xx_gpio.h"。 2. 更改外设时钟使能函数:在STM32F4系列中,外设时钟使能函数的名称可能会有所不同。例如,将RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB|RCC_APB2Periph_GPIOA, ENABLE);更改为RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB|RCC_AHB1Periph_GPIOA, ENABLE);。 3. 更改GPIO初始化结构:由于不同系列的STM32芯片具有不同的寄存器映射和功能,需要根据STM32F4系列的GPIO寄存器和功能进行相应更改。例如,将GPIO_InitTypeDef GPIO_InitStructure;更改为GPIO_InitTypeDef GPIO_InitStruct;。 4. 更改引脚宏定义:由于引脚定义可能会因芯片型号而有所不同,需要根据实际情况更改引脚宏定义。例如,将GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5|GPIO_Pin_7;更改为适用于STM32F4ZET6的引脚宏定义。 下面是修改后的代码: c void ADS1256_GPIOInit(void) { GPIO_InitTypeDef GPIO_InitStruct; RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB|RCC_AHB1Periph_GPIOA, ENABLE); //使能PB,PA端口时钟 GPIO_InitStruct.GPIO_Pin = GPIO_Pin_5|GPIO_Pin_7; //PA5 PA7 端口配置 GPIO_InitStruct.GPIO_Mode = GPIO_Mode_OUT; //推挽输出 GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz; //IO口速度为50MHz GPIO_InitStruct.GPIO_OType = GPIO_OType_PP; //推挽输出 GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL; //不使用上下拉电阻 GPIO_Init(GPIOA, &GPIO_InitStruct); GPIO_SetBits(GPIOA,GPIO_Pin_5|GPIO_Pin_7); // GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0; // 端口配置 PB0 GPIO_Init(GPIOB, &GPIO_InitStruct); GPIO_SetBits(GPIOB,GPIO_Pin_0); // GPIO_InitStruct.GPIO_Pin = GPIO_Pin_6; // 端口配置 PA6 DOUT GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN; //上拉输入 GPIO_Init(GPIOA, &GPIO_InitStruct); GPIO_InitStruct.GPIO_Pin = GPIO_Pin_1; // 端口配置 PB1 DRDY GPIO_Init(GPIOB, &GPIO_InitStruct); } 请注意,以上代码只是对GPIO初始化的修改,其他与ADS1256相关的代码可能需要根据芯片型号进行相应的修改。确保在修改代码时参考STM32F4系列的技术手册和参考手册,以确保正确配置引脚和外设。
nvic_irq_enable is a function in the C programming language that enables interrupts for a specific interrupt request line (IRQ) in a microcontroller. The function is typically used in embedded systems programming to allow the microcontroller to respond to external events or signals in real-time. The function takes an argument that specifies the IRQ line number to be enabled. Once the function is executed, the microcontroller's interrupt controller will be configured to allow interrupts on the specified line. This means that when an interrupt signal is received on that line, the microcontroller will pause its current task and jump to the interrupt service routine (ISR) associated with that line. Here is an example of how nvic_irq_enable might be used in a program: #include <stdio.h> #include "stm32f4xx.h" // includes the appropriate header file for the specific microcontroller being used void EXTI0_IRQHandler(void) // ISR for EXTI0 (external interrupt on line 0) { printf("External interrupt on line 0 has occurred!\n"); } int main(void) { // enable clock for GPIO and EXTI peripherals RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE); // configure GPIO pin as input with interrupt GPIO_InitTypeDef GPIO_InitStruct; GPIO_InitStruct.GPIO_Pin = GPIO_Pin_0; GPIO_InitStruct.GPIO_Mode = GPIO_Mode_IN; GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOA, &GPIO_InitStruct); // configure EXTI line for GPIO pin SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_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; EXTI_InitStruct.EXTI_LineCmd = ENABLE; EXTI_Init(&EXTI_InitStruct); // enable interrupt for EXTI0 line NVIC_EnableIRQ(EXTI0_IRQn); while(1) { // main program loop } return 0; } In this example, the program configures an external interrupt on GPIO pin 0 of port A on an STM32F4 microcontroller. The nvic_irq_enable function is used to enable interrupts for EXTI line 0, which is associated with the GPIO pin. When the button attached to the pin is pressed, an interrupt signal is generated and the program jumps to the EXTI0_IRQHandler function, which prints a message to the console.
好的,以下是一个使用 DMA1_Channel1_IRQn 中断的 STM32F4 程序的代码示例,主要实现了从 ADC1 数据寄存器中读取采样数据,通过 DMA1 传输到内存中,并在传输完成时通过 DMA1_Channel1_IRQHandler 中断进行处理: c #include "stm32f4xx.h" #include "stm32f4xx_dma.h" #include "stm32f4xx_adc.h" #define ADC1_DR_ADDRESS ((uint32_t)0x4001204C) #define ADC1_CHANNEL 0 volatile uint16_t ADCValue; void DMA_Configuration(void) { DMA_InitTypeDef DMA_InitStructure; RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE); DMA_DeInit(DMA1_Stream0); DMA_InitStructure.DMA_Channel = DMA_Channel_0; DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR; DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADCValue; DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; DMA_InitStructure.DMA_BufferSize = 1; DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable; DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; DMA_InitStructure.DMA_Priority = DMA_Priority_High; DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable; DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull; DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; DMA_Init(DMA1_Stream0, &DMA_InitStructure); DMA_Cmd(DMA1_Stream0, ENABLE); } void ADC_Configuration(void) { ADC_InitTypeDef ADC_InitStructure; GPIO_InitTypeDef GPIO_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOA, &GPIO_InitStructure); ADC_CommonInitTypeDef ADC_CommonInitStructure; ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent; ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2; ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled; ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles; ADC_CommonInit(&ADC_CommonInitStructure); ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; ADC_InitStructure.ADC_ScanConvMode = DISABLE; ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None; ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1; ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; ADC_InitStructure.ADC_NbrOfConversion = 1; ADC_Init(ADC1, &ADC_InitStructure); ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_15Cycles); ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE); ADC_DMACmd(ADC1, ENABLE); ADC_Cmd(ADC1, ENABLE); ADC_SoftwareStartConv(ADC1); } void NVIC_Configuration(void) { NVIC_InitTypeDef NVIC_InitStructure; NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); } void DMA1_Channel1_IRQHandler(void) { if(DMA_GetFlagStatus(DMA1_Stream0, DMA_FLAG_TCIF0) != RESET) { DMA_ClearFlag(DMA1_Stream0, DMA_FLAG_TCIF0); ADC_SoftwareStartConv(ADC1); // 处理采样数据 } } int main(void) { DMA_Configuration(); ADC_Configuration(); NVIC_Configuration(); while(1); } 这份代码主要完成了以下工作: 1. 配置 ADC1 和 GPIOA0,设置采样通道和采样时间; 2. 配置 DMA1_Stream0,将 ADC1 的 DR 寄存器的值传输到 ADCValue 变量中; 3. 配置 DMA1_Channel1_IRQn 中断,设置优先级,并在传输完成时进行处理。 在程序中,ADC_SoftwareStartConv 函数用于启动 ADC1 的转换,将采样数据传输到 ADCValue 变量中,当 DMA1_Stream0 传输完成时,会触发 DMA1_Channel1_IRQHandler 中断,我们可以在此中断服务函数中进行采样数据的处理。
抱歉,我的回答之前可能有误导性。在使用SPI接口时,通常只需要将SPI的SCK(时钟线)、MISO(主设备输出从设备输入)和MOSI(主设备输入从设备输出)引脚配置为复用功能(Alternate Function)模式即可,而不需要将它们同时配置为推挽输出类型(GPIO_OType_PP)。 正确的代码应该是将这三个引脚配置为复用功能模式,并根据具体的SPI外设和引脚复用映射关系进行配置。SPI的引脚复用映射关系可能因不同的STM32系列和具体型号而有所不同,因此需要查阅相关的芯片手册或参考示例代码。 下面是一个修正后的示例代码,假设我们将SPI1的SCK引脚配置为GPIOA的Pin5,MISO引脚配置为GPIOA的Pin6,MOSI引脚配置为GPIOA的Pin7: c #include "stm32f4xx.h" void SPI_Init(void) { GPIO_InitTypeDef GPIO_InitStruct; SPI_InitTypeDef SPI_InitStruct; // 使能SPI时钟 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE); // 配置SCK、MISO和MOSI引脚 RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStruct.GPIO_OType = GPIO_OType_PP; GPIO_InitStruct.GPIO_Speed = GPIO_Speed_100MHz; GPIO_InitStruct.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7; GPIO_Init(GPIOA, &GPIO_InitStruct); // 配置SPI引脚复用 GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_SPI1); GPIO_PinAFConfig(GPIOA, GPIO_PinSource6, GPIO_AF_SPI1); GPIO_PinAFConfig(GPIOA, GPIO_PinSource7, GPIO_AF_SPI1); // 配置SPI参数 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_2; // 设置SPI时钟频率为APB2时钟的1/2 SPI_InitStruct.SPI_FirstBit = SPI_FirstBit_MSB; SPI_InitStruct.SPI_CRCPolynomial = 7; SPI_Init(SPI1, &SPI_InitStruct); // 使能SPI SPI_Cmd(SPI1, ENABLE); } uint8_t SPI_Transfer(uint8_t data) { // 等待发送缓冲区为空 while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_TXE) == RESET); // 发送数据 SPI_I2S_SendData(SPI1, data); // 等待接收缓冲区非空 while (SPI_I2S_GetFlagStatus(SPI1, SPI_I2S_FLAG_RXNE) == RESET); // 返回接收到的数据 return SPI_I2S_ReceiveData(SPI1); } int main(void) { uint8_t txData = 0xAA; uint8_t rxData; SPI_Init(); while (1) { // 发送并接收数据 rxData = SPI_Transfer(txData); // 处理接收到的数据 // ... // 延时一段时间 for (int i = 0; i < 100000; i++); } } 这个示例代码将SCK、MISO和MOSI引脚配置为复用功能模式,并将它们与SPI1外设的引脚复用映射关系对应起来。在实际使用时,请根据具体的芯片手册和引脚映射关系来进行配置。
以下是一个使用USART_SendData函数向外发送八位数字的C语言程序例子: c #include <stm32f4xx.h> void USART1_Send_Byte(uint8_t byte); int main(void) { // 初始化USART1 RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE); GPIO_InitTypeDef GPIO_InitStruct; GPIO_StructInit(&GPIO_InitStruct); GPIO_InitStruct.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10; GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStruct.GPIO_OType = GPIO_OType_PP; GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP; GPIO_Init(GPIOA, &GPIO_InitStruct); GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_USART1); GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_USART1); USART_InitTypeDef USART_InitStruct; USART_StructInit(&USART_InitStruct); USART_InitStruct.USART_BaudRate = 9600; 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_Tx; USART_Init(USART1, &USART_InitStruct); USART_Cmd(USART1, ENABLE); // 发送八位数字 uint8_t data = 0x12; // 代表一个八位数字,例如 18 USART1_Send_Byte(data); while(1) { } } void USART1_Send_Byte(uint8_t byte) { while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET); USART_SendData(USART1, byte); } 在这个例子中,使用了STM32F4xx系列的单片机,通过初始化USART1的GPIO和USART的寄存器来配置串口通信。在主函数中,将一个八位数字的值赋给了data变量,并通过调用USART1_Send_Byte函数将其发送出去。函数内部通过USART_SendData函数将数据发送出去,发送的数据为byte变量。需要注意的是,在发送数据之前需要检查USART_FLAG_TXE标志位,以确保数据可以成功发送。
NVIC_Type结构体是用于控制中断的结构体,下面是一个使用实例: #include "stm32f4xx.h" int main(void) { // 使能SYSCFG时钟 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE); // 配置PA0为外部中断 GPIO_InitTypeDef GPIO_InitStructure; EXTI_InitTypeDef EXTI_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOA, &GPIO_InitStructure); SYSCFG_EXTILineConfig(EXTI_PortSourceGPIOA, EXTI_PinSource0); EXTI_InitStructure.EXTI_Line = EXTI_Line0; EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising; EXTI_InitStructure.EXTI_LineCmd = ENABLE; EXTI_Init(&EXTI_InitStructure); NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x00; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x00; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); while(1) { // 程序主循环 } } void EXTI0_IRQHandler(void) { if(EXTI_GetITStatus(EXTI_Line0) != RESET) { // 处理中断事件 EXTI_ClearITPendingBit(EXTI_Line0); } } 在上面的代码中,我们使用了NVIC_InitTypeDef结构体来初始化NVIC控制器。NVIC_InitStructure.NVIC_IRQChannel表示中断通道,NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority表示抢占优先级,NVIC_InitStructure.NVIC_IRQChannelSubPriority表示子优先级,NVIC_InitStructure.NVIC_IRQChannelCmd表示中断使能状态。在上面的代码中,我们将PA0配置为外部中断,并且当PA0引脚上升沿触发时,会触发EXTI0_IRQn中断,并且处理该中断事件。
好的,以下是一个简单的STM32实例DAC数模转换实验,采用ADC采集DAC输出的数据。 首先,我们需要初始化DAC和ADC,以及配置ADC的DMA传输。 c #include "stm32f4xx.h" #define ADC_DR_ADDRESS ((uint32_t)0x4001204C) void DAC_ADC_Init(void) { GPIO_InitTypeDef GPIO_InitStructure; DAC_InitTypeDef DAC_InitStructure; ADC_InitTypeDef ADC_InitStructure; DMA_InitTypeDef DMA_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; /* Enable GPIOA clock */ RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); /* Configure PA4 (DAC1) in analog mode */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOA, &GPIO_InitStructure); /* Enable DAC clock */ RCC_APB1PeriphClockCmd(RCC_APB1Periph_DAC, ENABLE); /* Configure DAC */ DAC_InitStructure.DAC_Trigger = DAC_Trigger_None; DAC_InitStructure.DAC_WaveGeneration = DAC_WaveGeneration_None; DAC_InitStructure.DAC_OutputBuffer = DAC_OutputBuffer_Enable; DAC_Init(DAC_Channel_1, &DAC_InitStructure); /* Enable DAC Channel1 */ DAC_Cmd(DAC_Channel_1, ENABLE); /* Enable ADC1 clock */ RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); /* Configure PA5 (ADC1 Channel 5) in analog mode */ GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOA, &GPIO_InitStructure); /* Configure ADC1 */ ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; ADC_InitStructure.ADC_ScanConvMode = DISABLE; ADC_InitStructure.ADC_ContinuousConvMode = DISABLE; ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1; ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; ADC_InitStructure.ADC_NbrOfChannel = 1; ADC_Init(ADC1, &ADC_InitStructure); /* ADC1 regular channel5 configuration */ ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 1, ADC_SampleTime_480Cycles); /* Enable DMA1 clock */ RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE); /* DMA1 Stream0 channel0 configuration */ DMA_InitStructure.DMA_Channel = DMA_Channel_0; DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC_DR_ADDRESS; DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t) &ADCConvertedValue; DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; DMA_InitStructure.DMA_BufferSize = 1; DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable; DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; DMA_InitStructure.DMA_Priority = DMA_Priority_High; DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable; DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull; DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; DMA_Init(DMA1_Stream0, &DMA_InitStructure); /* Enable DMA1 Stream0 */ DMA_Cmd(DMA1_Stream0, ENABLE); /* Enable ADC1 DMA */ ADC_DMACmd(ADC1, ENABLE); /* Enable ADC1 */ ADC_Cmd(ADC1, ENABLE); /* Enable ADC1 reset calibration register */ ADC_ResetCalibration(ADC1); while(ADC_GetResetCalibrationStatus(ADC1)); /* Start ADC1 calibration */ ADC_StartCalibration(ADC1); while(ADC_GetCalibrationStatus(ADC1)); } 然后,我们需要编写一个函数来设置DAC输出的电压值。 c void Set_DAC_Voltage(uint16_t value) { DAC_SetChannel1Data(DAC_Align_12b_R, value); DAC_SoftwareTriggerCmd(DAC_Channel_1, ENABLE); } 最后,我们可以编写一个函数来读取ADC采集到的DAC输出的电压值。 c uint16_t Get_ADC_Voltage(void) { return ADCConvertedValue; } 我们可以在主函数中调用这些函数来进行实验。 c int main(void) { DAC_ADC_Init(); while (1) { Set_DAC_Voltage(2048); uint16_t adc_value = Get_ADC_Voltage(); // 处理采集到的ADC数值 } } 这样,我们就可以进行STM32实例DAC数模转换实验了。
首先,你需要连接一个PWM输出引脚到电机或其他装置上,以控制它的转速或运动。然后,你需要连接一个按键到单片机的GPIO引脚上,以便输入按键状态。以下是一个简单的代码实现,可以让你通过按键来控制PWM占空比输出: c #include "stm32f4xx.h" int main(void) { GPIO_InitTypeDef GPIO_InitStructure; TIM_TimeBaseInitTypeDef TIM_TimeBaseStructure; TIM_OCInitTypeDef TIM_OCInitStructure; // 开启外设时钟 RCC_APB1PeriphClockCmd(RCC_APB1Periph_TIM2, ENABLE); RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); // 配置GPIO引脚为输入模式 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; GPIO_Init(GPIOA, &GPIO_InitStructure); // 配置PWM输出引脚 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz; GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOA, &GPIO_InitStructure); // 将引脚与定时器关联 GPIO_PinAFConfig(GPIOA, GPIO_PinSource5, GPIO_AF_TIM2); // 初始化定时器 TIM_TimeBaseStructure.TIM_Period = 8399; // PWM频率为10kHz TIM_TimeBaseStructure.TIM_Prescaler = 0; TIM_TimeBaseStructure.TIM_ClockDivision = 0; TIM_TimeBaseStructure.TIM_CounterMode = TIM_CounterMode_Up; TIM_TimeBaseInit(TIM2, &TIM_TimeBaseStructure); // 配置PWM输出通道 TIM_OCInitStructure.TIM_OCMode = TIM_OCMode_PWM1; TIM_OCInitStructure.TIM_OutputState = TIM_OutputState_Enable; TIM_OCInitStructure.TIM_OCPolarity = TIM_OCPolarity_High; TIM_OCInitStructure.TIM_Pulse = 0; TIM_OC2Init(TIM2, &TIM_OCInitStructure); TIM_OC2PreloadConfig(TIM2, TIM_OCPreload_Enable); // 启动定时器 TIM_Cmd(TIM2, ENABLE); while (1) { // 检查按键状态 if (GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_0) == RESET) { // 按键按下,增加PWM占空比 uint16_t pulse = TIM_GetCapture2(TIM2); if (pulse < 8400) pulse++; TIM_SetCompare2(TIM2, pulse); // 等待按键释放 while (GPIO_ReadInputDataBit(GPIOA, GPIO_Pin_0) == RESET); } } } 在这个例子中,我们使用了TIM2的第二个通道来生成PWM输出,频率为10kHz,占空比默认为0。当按下按键时,我们将占空比逐步增加,直到达到最大值为100%。当占空比达到100%时,再次按下按键将会重新从0开始。
STM32F411标准库支持SPI1和SPI2两个SPI接口。下面是使用标准库配置和使用SPI1和SPI2的示例代码: 1. 配置SPI1: c #include "stm32f4xx.h" void SPI1_Init(void) { // 使能SPI1时钟 RCC_APB2PeriphClockCmd(RCC_APB2Periph_SPI1, ENABLE); // 配置SPI1引脚 GPIO_InitTypeDef GPIO_InitStruct; RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); GPIO_InitStruct.GPIO_Pin = GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7; GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStruct.GPIO_OType = GPIO_OType_PP; GPIO_InitStruct.GPIO_Speed = GPIO_Speed_100MHz; GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOA, &GPIO_InitStruct); // 配置SPI1参数 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_256; SPI_InitStruct.SPI_FirstBit = SPI_FirstBit_MSB; SPI_InitStruct.SPI_CRCPolynomial = 7; SPI_Init(SPI1, &SPI_InitStruct); // 使能SPI1 SPI_Cmd(SPI1, ENABLE); } 2. 配置SPI2: c #include "stm32f4xx.h" void SPI2_Init(void) { // 使能SPI2时钟 RCC_APB1PeriphClockCmd(RCC_APB1Periph_SPI2, ENABLE); // 配置SPI2引脚 GPIO_InitTypeDef GPIO_InitStruct; RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE); GPIO_InitStruct.GPIO_Pin = GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15; GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStruct.GPIO_OType = GPIO_OType_PP; GPIO_InitStruct.GPIO_Speed = GPIO_Speed_100MHz; GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOB, &GPIO_InitStruct); // 配置SPI2参数 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_256; SPI_InitStruct.SPI_FirstBit = SPI_FirstBit_MSB; SPI_InitStruct.SPI_CRCPolynomial = 7; SPI_Init(SPI2, &SPI_InitStruct); // 使能SPI2 SPI_Cmd(SPI2, ENABLE); }
下面是分别初始化串口1、2、3的代码示例(以STM32F4为例): 串口1初始化: #include "stm32f4xx.h" void USART1_Init(void) { GPIO_InitTypeDef GPIO_InitStruct; USART_InitTypeDef USART_InitStruct; NVIC_InitTypeDef NVIC_InitStruct; // Enable clock for GPIOB RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOB, ENABLE); // Enable clock for USART1 RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE); // Configure PB6 as TX pin GPIO_InitStruct.GPIO_Pin = GPIO_Pin_6; GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStruct.GPIO_OType = GPIO_OType_PP; GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP; GPIO_Init(GPIOB, &GPIO_InitStruct); // Configure PB7 as RX pin GPIO_InitStruct.GPIO_Pin = GPIO_Pin_7; GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOB, &GPIO_InitStruct); // Connect TX and RX pins to USART1 alternative function GPIO_PinAFConfig(GPIOB, GPIO_PinSource6, GPIO_AF_USART1); GPIO_PinAFConfig(GPIOB, GPIO_PinSource7, GPIO_AF_USART1); // Configure USART1 USART_InitStruct.USART_BaudRate = 9600; 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); // Enable receive interrupt USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); // Configure USART1 interrupt NVIC_InitStruct.NVIC_IRQChannel = USART1_IRQn; NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0; NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStruct); // Enable USART1 USART_Cmd(USART1, ENABLE); } 串口2初始化: #include "stm32f4xx.h" void USART2_Init(void) { GPIO_InitTypeDef GPIO_InitStruct; USART_InitTypeDef USART_InitStruct; NVIC_InitTypeDef NVIC_InitStruct; // Enable clock for GPIOA RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); // Enable clock for USART2 RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2, ENABLE); // Configure PA2 as TX pin GPIO_InitStruct.GPIO_Pin = GPIO_Pin_2; GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStruct.GPIO_OType = GPIO_OType_PP; GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP; GPIO_Init(GPIOA, &GPIO_InitStruct); // Configure PA3 as RX pin GPIO_InitStruct.GPIO_Pin = GPIO_Pin_3; GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOA, &GPIO_InitStruct); // Connect TX and RX pins to USART2 alternative function GPIO_PinAFConfig(GPIOA, GPIO_PinSource2, GPIO_AF_USART2); GPIO_PinAFConfig(GPIOA, GPIO_PinSource3, GPIO_AF_USART2); // Configure USART2 USART_InitStruct.USART_BaudRate = 9600; 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(USART2, &USART_InitStruct); // Enable receive interrupt USART_ITConfig(USART2, USART_IT_RXNE, ENABLE); // Configure USART2 interrupt NVIC_InitStruct.NVIC_IRQChannel = USART2_IRQn; NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0; NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStruct); // Enable USART2 USART_Cmd(USART2, ENABLE); } 串口3初始化: #include "stm32f4xx.h" void USART3_Init(void) { GPIO_InitTypeDef GPIO_InitStruct; USART_InitTypeDef USART_InitStruct; NVIC_InitTypeDef NVIC_InitStruct; // Enable clock for GPIOC RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE); // Enable clock for USART3 RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE); // Configure PC10 as TX pin GPIO_InitStruct.GPIO_Pin = GPIO_Pin_10; GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStruct.GPIO_OType = GPIO_OType_PP; GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_UP; GPIO_Init(GPIOC, &GPIO_InitStruct); // Configure PC11 as RX pin GPIO_InitStruct.GPIO_Pin = GPIO_Pin_11; GPIO_InitStruct.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStruct.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStruct.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOC, &GPIO_InitStruct); // Connect TX and RX pins to USART3 alternative function GPIO_PinAFConfig(GPIOC, GPIO_PinSource10, GPIO_AF_USART3); GPIO_PinAFConfig(GPIOC, GPIO_PinSource11, GPIO_AF_USART3); // Configure USART3 USART_InitStruct.USART_BaudRate = 9600; 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(USART3, &USART_InitStruct); // Enable receive interrupt USART_ITConfig(USART3, USART_IT_RXNE, ENABLE); // Configure USART3 interrupt NVIC_InitStruct.NVIC_IRQChannel = USART3_IRQn; NVIC_InitStruct.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStruct.NVIC_IRQChannelSubPriority = 0; NVIC_InitStruct.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStruct); // Enable USART3 USART_Cmd(USART3, ENABLE); }
下面是一个UCOSIII外部中断控制key0、key1、key2按键的代码示例: c #include "stm32f4xx.h" #include "ucos_ii.h" #define KEY0_GPIO_PORT GPIOA #define KEY0_GPIO_PIN GPIO_Pin_0 #define KEY0_EXTI_LINE EXTI_Line0 #define KEY0_EXTI_PORT EXTI_PortSourceGPIOA #define KEY0_EXTI_PIN EXTI_PinSource0 #define KEY0_EXTI_IRQ EXTI0_IRQn #define KEY1_GPIO_PORT GPIOE #define KEY1_GPIO_PIN GPIO_Pin_2 #define KEY1_EXTI_LINE EXTI_Line2 #define KEY1_EXTI_PORT EXTI_PortSourceGPIOE #define KEY1_EXTI_PIN EXTI_PinSource2 #define KEY1_EXTI_IRQ EXTI2_IRQn #define KEY2_GPIO_PORT GPIOE #define KEY2_GPIO_PIN GPIO_Pin_3 #define KEY2_EXTI_LINE EXTI_Line3 #define KEY2_EXTI_PORT EXTI_PortSourceGPIOE #define KEY2_EXTI_PIN EXTI_PinSource3 #define KEY2_EXTI_IRQ EXTI3_IRQn static OS_EVENT* key_sem; void Key_Init(void) { GPIO_InitTypeDef GPIO_InitStructure; EXTI_InitTypeDef EXTI_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA | RCC_AHB1Periph_GPIOE, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_SYSCFG, ENABLE); GPIO_InitStructure.GPIO_Pin = KEY0_GPIO_PIN; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; GPIO_Init(KEY0_GPIO_PORT, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = KEY1_GPIO_PIN; GPIO_Init(KEY1_GPIO_PORT, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = KEY2_GPIO_PIN; GPIO_Init(KEY2_GPIO_PORT, &GPIO_InitStructure); SYSCFG_EXTILineConfig(KEY0_EXTI_PORT, KEY0_EXTI_PIN); SYSCFG_EXTILineConfig(KEY1_EXTI_PORT, KEY1_EXTI_PIN); SYSCFG_EXTILineConfig(KEY2_EXTI_PORT, KEY2_EXTI_PIN); EXTI_InitStructure.EXTI_Line = KEY0_EXTI_LINE; EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt; EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Falling; EXTI_InitStructure.EXTI_LineCmd = ENABLE; EXTI_Init(&EXTI_InitStructure); EXTI_InitStructure.EXTI_Line = KEY1_EXTI_LINE; EXTI_Init(&EXTI_InitStructure); EXTI_InitStructure.EXTI_Line = KEY2_EXTI_LINE; EXTI_Init(&EXTI_InitStructure); NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0f; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0f; NVIC_InitStructure.NVIC_IRQChannel = KEY0_EXTI_IRQ; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); NVIC_InitStructure.NVIC_IRQChannel = KEY1_EXTI_IRQ; NVIC_Init(&NVIC_InitStructure); NVIC_InitStructure.NVIC_IRQChannel = KEY2_EXTI_IRQ; NVIC_Init(&NVIC_InitStructure); } void Key_ISR(uint8_t key) { OS_ERR err; EXTI_ClearITPendingBit(key == 0 ? KEY0_EXTI_LINE : key == 1 ? KEY1_EXTI_LINE : KEY2_EXTI_LINE); OSSemPost(key_sem, OS_OPT_POST_ALL, &err); } void Key_Task(void* pdata) { OS_ERR err; uint8_t key; while (1) { OSSemPend(key_sem, 0, OS_OPT_PEND_BLOCKING, NULL, &err); if (GPIO_ReadInputDataBit(KEY0_GPIO_PORT, KEY0_GPIO_PIN) == RESET) { key = 0; } else if (GPIO_ReadInputDataBit(KEY1_GPIO_PORT, KEY1_GPIO_PIN) == RESET) { key = 1; } else if (GPIO_ReadInputDataBit(KEY2_GPIO_PORT, KEY2_GPIO_PIN) == RESET) { key = 2; } // 处理按键按下事件 printf("Key%d pressed!\r\n", key); } } int main(void) { OS_ERR err; OSInit(); Key_Init(); key_sem = OSSemCreate(0, &err); OSTaskCreate(Key_Task, NULL, OSTaskStkChk, 10, 0, NULL, &err); OSStart(); return 0; } void HardFault_Handler(void) { while (1); } 上述代码中,Key_Init()函数用于初始化三个按键所对应的GPIO口、中断线和中断服务函数。在中断服务函数Key_ISR()中,使用OSSemPost()函数发送信号量,以通知任务处理按键按下事件。而在任务函数Key_Task()中,则使用OSSemPend()函数等待信号量,并在信号量被触发时通过GPIO口读取按键状态,从而确定是哪个按键被按下,并处理相应的事件。
以下是使用STM32F4库函数编写ADC1的DMA2的示例代码: #include "stm32f4xx.h" #define ADC1_DR_ADDRESS ((uint32_t)0x4001204C) void ADC_DMA_Init(void) { GPIO_InitTypeDef GPIO_InitStructure; ADC_InitTypeDef ADC_InitStructure; DMA_InitTypeDef DMA_InitStructure; // Enable clock for ADC1, DMA2 and GPIOA RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 | RCC_AHB1Periph_GPIOA, ENABLE); RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE); // Configure PA0 as analog input GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN; GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOA, &GPIO_InitStructure); // ADC1 configuration ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b; ADC_InitStructure.ADC_ScanConvMode = DISABLE; ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None; ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; ADC_InitStructure.ADC_NbrOfConversion = 1; ADC_Init(ADC1, &ADC_InitStructure); // Configure DMA2 stream 0 for ADC1 DMA_InitStructure.DMA_Channel = DMA_Channel_0; DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR; DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADC_Value; DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; DMA_InitStructure.DMA_BufferSize = 1; DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable; DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; DMA_InitStructure.DMA_Priority = DMA_Priority_High; DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable; DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull; DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single; DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single; DMA_Init(DMA2_Stream0, &DMA_InitStructure); // Enable DMA2 stream 0 DMA_Cmd(DMA2_Stream0, ENABLE); // Enable ADC1 DMA ADC_DMACmd(ADC1, ENABLE); // Enable ADC1 ADC_Cmd(ADC1, ENABLE); // Start ADC1 conversion ADC_SoftwareStartConv(ADC1); } int main(void) { ADC_DMA_Init(); while (1) { // Do something with ADC_Value } } 在上面的代码中,我们首先定义了ADC1_DR_ADDRESS常量,它的值等于ADC1数据寄存器的地址。我们还定义了ADC_DMA_Init函数,这个函数用于初始化ADC1和DMA2。在函数中,我们首先启用了ADC1、DMA2和GPIOA的时钟。然后,我们配置了PA0为模拟输入,并使用ADC_Init函数配置了ADC1。接下来,我们使用DMA_Init函数配置了DMA2流0用于ADC1,并启用了DMA2流0。最后,我们启用了ADC1 DMA和ADC1,并启动了ADC1转换。 在main函数中,我们只需调用ADC_DMA_Init函数即可初始化ADC1和DMA2。在while循环中,我们可以读取ADC_Value变量的值,并对其进行操作。需要注意的是,ADC_Value变量是uint16_t类型,因为我们使用的是12位ADC。如果你使用的是10位ADC,则需要将它改为uint16_t类型。

最新推荐

0690、断线检测式报警电路.rar

0689、短路检测式报警电路.rar

网络技术-综合布线-河南农村宽带客户细分的研究.pdf

网络技术-综合布线-河南农村宽带客户细分的研究.pdf

管理建模和仿真的文件

管理Boualem Benatallah引用此版本:布阿利姆·贝纳塔拉。管理建模和仿真。约瑟夫-傅立叶大学-格勒诺布尔第一大学,1996年。法语。NNT:电话:00345357HAL ID:电话:00345357https://theses.hal.science/tel-003453572008年12月9日提交HAL是一个多学科的开放存取档案馆,用于存放和传播科学研究论文,无论它们是否被公开。论文可以来自法国或国外的教学和研究机构,也可以来自公共或私人研究中心。L’archive ouverte pluridisciplinaire

理解Socket编程的基础概念

# 1. 介绍Socket编程的基本概念 ## 1.1 什么是Socket编程 Socket编程是一种在网络编程中使用的抽象概念,它允许应用程序通过网络进行通信。通过Socket编程,可以实现客户端与服务器端之间的数据交换和通信。 ## 1.2 Socket编程的应用范围 Socket编程广泛应用于网络通信领域,包括但不限于Web服务、即时通讯、网络游戏、远程控制等。 ## 1.3 Socket编程的基本原理 Socket编程基于网络套接字(socket)的概念,通过套接字建立连接、传输数据和关闭连接来实现通信。在Socket编程中,使用不同的协议(如TCP、UDP)来实现数据传输和通信

c语言桌子上有几堆糖果,每堆糖果的数量记录在一个整型数组 nums 中。我们可以每次选择任意一堆,拿走其中的一颗或者两颗糖果,求拿完所有糖果的最少次数。

好的,以下是 C 语言的实现代码: ```c #include <stdio.h> #include <stdlib.h> int min(int a, int b) { return a < b ? a : b; } int minSteps(int* nums, int numsSize) { int dp[numsSize + 1]; dp[0] = 0; dp[1] = 1; for (int i = 2; i <= numsSize; i++) { dp[i] = min(dp[i-1] + 1, dp[i-2] + 1)

供应链管理制度(全).ppt

供应链管理制度

"互动学习:行动中的多样性与论文攻读经历"

多样性她- 事实上SCI NCES你的时间表ECOLEDO C Tora SC和NCESPOUR l’Ingén学习互动,互动学习以行动为中心的强化学习学会互动,互动学习,以行动为中心的强化学习计算机科学博士论文于2021年9月28日在Villeneuve d'Asq公开支持马修·瑟林评审团主席法布里斯·勒菲弗尔阿维尼翁大学教授论文指导奥利维尔·皮耶昆谷歌研究教授:智囊团论文联合主任菲利普·普雷教授,大学。里尔/CRISTAL/因里亚报告员奥利维耶·西格德索邦大学报告员卢多维奇·德诺耶教授,Facebook /索邦大学审查员越南圣迈IMT Atlantic高级讲师邀请弗洛里安·斯特鲁布博士,Deepmind对于那些及时看到自己错误的人...3谢谢你首先,我要感谢我的两位博士生导师Olivier和Philippe。奥利维尔,"站在巨人的肩膀上"这句话对你来说完全有意义了。从科学上讲,你知道在这篇论文的(许多)错误中,你是我可以依

Gunicorn监控和自动化运维

# 1. Gunicorn简介 ### 1.1 什么是Gunicorn Gunicorn是一个轻量级的Python WSGI HTTP服务器,可用于运行Django、Flask等Web应用。它通过将请求传递给应用程序的多个进程来实现并发处理,从而提高Web应用的性能和稳定性。 ### 1.2 Gunicorn的特点和优势 - **简单易用**:Gunicorn易于安装和配置,使用简单。 - **性能稳定**:Gunicorn能够有效管理并发连接,提供稳定的性能。 - **资源占用低**:相较于其他服务器,Gunicorn对资源的消耗相对较低。 - **支持异步处理**:Gunicorn

inno setup 怎么在脚本中设置程序的安装目录

在 Inno Setup 脚本中,你可以使用 `[Setup]` 节点中的 `DefaultDirName` 属性来设置应用程序的安装目录。默认情况下,`DefaultDirName` 属性设置为 `{pf}\{#MyAppPublisher}\{#MyAppName}`,其中 `{pf}` 表示“Program Files”目录,`{#MyAppPublisher}` 和 `{#MyAppName}` 分别表示你在脚本中定义的应用程序发布者和名称。 以下是一个示例脚本,演示如何设置应用程序的安装目录: ``` [Setup] AppName=MyApp AppVersion=1.0 De

中铁隧道集团机械设备管理规则.docx

中铁隧道集团机械设备管理规则.docx