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(一)USART寄存器映象 (二)时钟函数及其参数 USART1在APB2(高速) USART2、USART3、USART4、USART5在APB1(低速) void RCC_APB2PeriphClockCmd(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->APB2ENR |= RCC_APB2Periph; } else { RCC->APB2ENR &= ~RCC_APB2Periph; } } @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 clock. This parameter can be: ENABLE or DISABLE. (三)初始化USART_InitTypeDef; typedef struct { uint32_t USART_BaudRate; /*!< This member configures the USART communication baud rate. The baud rate is computed using the following formula: - IntegerDivider = ((PCLKx) / (16 * (USART_InitStruct->USART_BaudRate))) - FractionalDivider = ((IntegerDivider - ((u32) IntegerDivider)) * 16) + 0.5 */ uint16_t USART_WordLength; /*!< Specifies the number of data bits transmitted or received in a frame. This parameter can be a value of @ref USART_Word_Length */ uint16_t USART_StopBits; /*!< Specifies the number of stop bits transmitted. This parameter can be a value of @ref USART_Stop_Bits */ uint16_t USART_Parity; /*!< Specifies the parity mode. This parameter can be a value of @ref USART_Parity @note When parity is enabled, the computed parity is inserted at the MSB position of the transmitted data (9th bit when the word length is set to 9 data bits; 8th bit when the word length is set to 8 data bits). */ uint16_t USART_Mode; /*!< Specifies wether the Receive or Transmit mode is enabled or disabled. This parameter can be a value of @ref USART_Mode */ uint16_t USART_HardwareFlowControl; /*!< Specifies wether the hardware flow control mode is enabled or disabled. This parameter can be a value of @ref USART_Hardware_Flow_Control */ } USART_InitTypeDef; void USART_Init(USART_TypeDef* USARTx, USART_InitTypeDef* USART_InitStruct); 1 (四)代码 #ifndef __BSP_USART_H #define __BSP_USART_H #include "stm32f10x.h" #include #define DEBUG_USART1 1 #define DEBUG_USART2 0 #define DEBUG_USART3 0 #define DEBUG_USART4 0 #define DEBUG_USART5 0 #if DEBUG_USART1 // 串口1-USART1 #define DEBUG_USARTx USART1 #define DEBUG_USART_CLK RCC_APB2Periph_USART1 #define DEBUG_USART_APBxClkCmd RCC_APB2PeriphClockCmd #define DEBUG_USART_BAUDRATE 115200 // USART GPIO 引脚宏定义 #define DEBUG_USART_GPIO_CLK (RCC_APB2Periph_GPIOA) #define DEBUG_USART_GPIO_APBxClkCmd RCC_APB2PeriphClockCmd #define DEBUG_USART_TX_GPIO_PORT GPIOA #define DEBUG_USART_TX_GPIO_PIN GPIO_Pin_9 #define DEBUG_USART_RX_GPIO_PORT GPIOA #define DEBUG_USART_RX_GPIO_PIN GPIO_Pin_10 #define DEBUG_USART_IRQ USART1_IRQn #define DEBUG_USART_IRQHandler USART1_IRQHandler #elif DEBUG_USART2 //串口2-USART2 #define DEBUG_USARTx USART2 #define DEBUG_USART_CLK RCC_APB1Periph_USART2 #define DEBUG_USART_APBxClkCmd RCC_APB1PeriphClockCmd #define DEBUG_USART_BAUDRATE 115200 // USART GPIO 引脚宏定义 #define DEBUG_USART_GPIO_CLK (RCC_APB2Periph_GPIOA) #define DEBUG_USART_GPIO_APBxClkCmd RCC_APB2PeriphClockCmd #define DEBUG_USART_TX_GPIO_PORT GPIOA #define DEBUG_USART_TX_GPIO_PIN GPIO_Pin_2 #define DEBUG_USART_RX_GPIO_PORT GPIOA #define DEBUG_USART_RX_GPIO_PIN GPIO_Pin_3 #define DEBUG_USART_IRQ USART2_IRQn #define DEBUG_USART_IRQHandler USART2_IRQHandler #elif DEBUG_USART3 //串口3-USART3 #define DEBUG_USARTx USART3 #define DEBUG_USART_CLK RCC_APB1Periph_USART3 #define DEBUG_USART_APBxClkCmd RCC_APB1PeriphClockCmd #define DEBUG_USART_BAUDRATE 115200 // USART GPIO 引脚宏定义 #define DEBUG_USART_GPIO_CLK (RCC_APB2Periph_GPIOB) #define DEBUG_USART_GPIO_APBxClkCmd RCC_APB2PeriphClockCmd #define DEBUG_USART_TX_GPIO_PORT GPIOB #define DEBUG_USART_TX_GPIO_PIN GPIO_Pin_10 #define DEBUG_USART_RX_GPIO_PORT GPIOB #define DEBUG_USART_RX_GPIO_PIN GPIO_Pin_11 #define DEBUG_USART_IRQ USART3_IRQn #define DEBUG_USART_IRQHandler USART3_IRQHandler #elif DEBUG_USART4 //串口4-UART4 #define DEBUG_USARTx UART4 #define DEBUG_USART_CLK RCC_APB1Periph_UART4 #define DEBUG_USART_APBxClkCmd RCC_APB1PeriphClockCmd #define DEBUG_USART_BAUDRATE 115200 // USART GPIO 引脚宏定义 #define DEBUG_USART_GPIO_CLK (RCC_APB2Periph_GPIOC) #define DEBUG_USART_GPIO_APBxClkCmd RCC_APB2PeriphClockCmd #define DEBUG_USART_TX_GPIO_PORT GPIOC #define DEBUG_USART_TX_GPIO_PIN GPIO_Pin_10 #define DEBUG_USART_RX_GPIO_PORT GPIOC #define DEBUG_USART_RX_GPIO_PIN GPIO_Pin_11 #define DEBUG_USART_IRQ UART4_IRQn #define DEBUG_USART_IRQHandler UART4_IRQHandler #elif DEBUG_USART5 //串口5-UART5 #define DEBUG_USARTx UART5 #define DEBUG_USART_CLK RCC_APB1Periph_UART5 #define DEBUG_USART_APBxClkCmd RCC_APB1PeriphClockCmd #define DEBUG_USART_BAUDRATE 115200 // USART GPIO 引脚宏定义 #define DEBUG_USART_GPIO_CLK (RCC_APB2Periph_GPIOC|RCC_APB2Periph_GPIOD) #define DEBUG_USART_GPIO_APBxClkCmd RCC_APB2PeriphClockCmd #define DEBUG_USART_TX_GPIO_PORT GPIOC #define DEBUG_USART_TX_GPIO_PIN GPIO_Pin_12 #define DEBUG_USART_RX_GPIO_PORT GPIOD #define DEBUG_USART_RX_GPIO_PIN GPIO_Pin_2 #define DEBUG_USART_IRQ UART5_IRQn #define DEBUG_USART_IRQHandler UART5_IRQHandler #endif void USART_Config(void); void Usart_SendByte(USART_TypeDef* pUSARTx, uint8_t data); void Usart_SendHalfWord(USART_TypeDef* pUSARTx, uint16_t data); void Usart_SendArray(USART_TypeDef* pUSARTx, uint8_t *array,uint8_t num); void Usart_SendStr(USART_TypeDef* pUSARTx, uint8_t *str); #endif /* __BSP_USART_H */ #include "bsp_usart.h" static void NVIC_Configuration(void) { NVIC_InitTypeDef NVIC_InitStructure; /* 嵌套向量中断控制器组选择 */ NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); /* 配置USART为中断源 */ NVIC_InitStructure.NVIC_IRQChannel = DEBUG_USART_IRQ; /* 抢断优先级*/ NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; /* 子优先级 */ NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; /* 使能中断 */ NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; /* 初始化配置NVIC */ NVIC_Init(&NVIC_InitStructure); } void USART_Config(void) { GPIO_InitTypeDef GPIO_InitStructure; USART_InitTypeDef USART_InitStructure; // 打开串口GPIO的时钟 DEBUG_USART_GPIO_APBxClkCmd(DEBUG_USART_GPIO_CLK, ENABLE); // 打开串口外设的时钟 DEBUG_USART_APBxClkCmd(DEBUG_USART_CLK, ENABLE); // 将USART Tx的GPIO配置为推挽复用模式 GPIO_InitStructure.GPIO_Pin = DEBUG_USART_TX_GPIO_PIN; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(DEBUG_USART_TX_GPIO_PORT, &GPIO_InitStructure); // 将USART Rx的GPIO配置为浮空输入模式 GPIO_InitStructure.GPIO_Pin = DEBUG_USART_RX_GPIO_PIN; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; GPIO_Init(DEBUG_USART_RX_GPIO_PORT, &GPIO_InitStructure); // 配置串口的工作参数 // 配置波特率 USART_InitStructure.USART_BaudRate = DEBUG_USART_BAUDRATE; // 配置 针数据字长 USART_InitStructure.USART_WordLength = USART_WordLength_8b; // 配置停止位 USART_InitStructure.USART_StopBits = USART_StopBits_1; // 配置校验位 USART_InitStructure.USART_Parity = USART_Parity_No ; // 配置硬件流控制 USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; // 配置工作模式,收发一起 USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; // 完成串口的初始化配置 USART_Init(DEBUG_USARTx, &USART_InitStructure); // 串口中断优先级配置 NVIC_Configuration(); // 使能串口接收中断 USART_ITConfig(DEBUG_USARTx, USART_IT_RXNE, ENABLE); // 使能串口 USART_Cmd(DEBUG_USARTx, ENABLE); } /* 发送一个字节 */ void Usart_SendByte(USART_TypeDef* pUSARTx, uint8_t data) { USART_SendData(pUSARTx, data); while( USART_GetFlagStatus(pUSARTx, USART_FLAG_TXE) == RESET ); } /* 发送两个字节的数据 */ void Usart_SendHalfWord(USART_TypeDef* pUSARTx, uint16_t data) { uint8_t temp_h,temp_l; temp_h = (data&0xff00) >> 8 ; temp_l = data&0xff; USART_SendData(pUSARTx, temp_h); while( USART_GetFlagStatus(pUSARTx, USART_FLAG_TXE) == RESET ); USART_SendData(pUSARTx, temp_l); while( USART_GetFlagStatus(pUSARTx, USART_FLAG_TXE) == RESET ); } /* 发送8位数据的数组 */ void Usart_SendArray(USART_TypeDef* pUSARTx, uint8_t *array,uint8_t num) { uint8_t i; for( i=0; i Usart_SendByte(pUSARTx, array); } while( USART_GetFlagStatus(pUSARTx, USART_FLAG_TC) == RESET ); } /* 发送字符串 */ void Usart_SendStr(USART_TypeDef* pUSARTx, uint8_t *str) { uint8_t i=0; do { Usart_SendByte(pUSARTx, *(str+i)); i++; }while(*(str+i) != ' |