刚学单片机, 弄了2天没有搞定,希望大家帮帮忙。谢谢! void USART_Config_USART1() { GPIO_InitTypeDef GPIO_InitStructure9; GPIO_InitTypeDef GPIO_InitStructure10; USART_InitTypeDef USART_InitStructure; NVIC_InitTypeDef NVIC_InitStructure; // Enable GPIO clock RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE); // Enable USART clock RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE); // Configure USART Tx as alternate function GPIO_InitStructure9.GPIO_Pin = GPIO_Pin_9; GPIO_InitStructure9.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStructure9.GPIO_OType = GPIO_OType_PP; GPIO_InitStructure9.GPIO_Speed = GPIO_Speed_50MHz; GPIO_InitStructure9.GPIO_PuPd = GPIO_PuPd_UP; GPIO_Init(GPIOA, &GPIO_InitStructure9); // Configure USART Rx as alternate function GPIO_InitStructure10.GPIO_Pin = GPIO_Pin_10; GPIO_InitStructure10.GPIO_Mode = GPIO_Mode_AF; GPIO_InitStructure10.GPIO_PuPd = GPIO_PuPd_NOPULL; GPIO_Init(GPIOA, &GPIO_InitStructure10); // Config AF pin GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_USART1); GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_USART1); // Initialize USART USART_InitStructure.USART_BaudRate = 9600; USART_InitStructure.USART_WordLength = USART_WordLength_8b; USART_InitStructure.USART_StopBits = USART_StopBits_1; USART_InitStructure.USART_Parity = USART_Parity_No; USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None; USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; USART_Init(USART1, &USART_InitStructure); // Enable USART interrupt USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); //USART_ITConfig(USART1, USART_IT_TXE, ENABLE); // Enable USART USART_Cmd(USART1, ENABLE); // Initialize USART interrupt on NVIC NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0F; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0x0F; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure); } void USART1_IRQHANDLER(void) { if(USART_GetFlagStatus(USART1, USART_FLAG_RXNE) != RESET) { USART_GetFlagStatus(USART1, USART_FLAG_TC); // Read one byte from the receive data register USART_SendData(USART1, USART_ReceiveData(USART1)); while(USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET) { } } } |
// NVIC configration
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
// USART configuation
USART_Config();
void USART_Config_USART1()
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
// Enable GPIO clock
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
// Enable USART clock
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
// Configure USART Tx as alternate function
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// Configure USART Rx as alternate function
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
// Config AF pin
GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_USART1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_USART1);
// Initialize USART
USART_InitStructure.USART_BaudRate = 9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USART1, &USART_InitStructure);
// Enable USART
USART_Cmd(USART1, ENABLE);
#if defined(INNO_DEBUG)
USART1_SendDataStrings("USART1 enabled! \n");
#endif
// Initialize USART interrupt on NVIC
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0xF;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
#if defined(INNO_DEBUG)
USART1_SendDataStrings("USART1 NVIC enabled! \n");
#endif
// Enable USART interrupt
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
#if defined(INNO_DEBUG)
USART1_SendDataStrings("USART1 IT_RXNE enabled! \n");
#endif
//USART_ITConfig(USART1, USART_IT_TXE, ENABLE);
#if defined(INNO_DEBUG)
USART1_SendDataStrings("USART1 IT_TXE enabled! \n");
#endif
}
void USART_Config()
{
USART_Config_USART1();
#if defined(INNO_DEBUG)
USART1_SendDataStrings("USART1 configuration finished! \n");
#endif
#if defined(INNO_DEBUG)
USART1_SendDataStrings("USART all configuration finished! \n");
#endif
}
it.c
void USART1_IRQHandler(void)
{
uint16_t receiveData = 0;
if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
{
receiveData = USART_ReceiveData(USART1);
USART1_SendDataCharacter(receiveData);
}
}
USART_GetITStatus && USART_ReceiveData
USART_GetFlagStatus && USART_ReceiveData
软件流清标志位都可
void USART_Config_USART1()
{
GPIO_InitTypeDef GPIO_InitStructure9;
GPIO_InitTypeDef GPIO_InitStructure10;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
USART_ClearITPendingBit(USART1, USART_IT_RXNE);
USART_ClearFlag(USART1, USART_FLAG_RXNE);
// Enable GPIO clock
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA, ENABLE);
// Enable USART clock
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
// Configure USART Tx as alternate function
GPIO_InitStructure9.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure9.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure9.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure9.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure9.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure9);
// Configure USART Rx as alternate function
GPIO_InitStructure10.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure10.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure10.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOA, &GPIO_InitStructure10);
// Config AF pin
GPIO_PinAFConfig(GPIOA, GPIO_PinSource9, GPIO_AF_USART1);
GPIO_PinAFConfig(GPIOA, GPIO_PinSource10, GPIO_AF_USART1);
// Initialize USART
USART_InitStructure.USART_BaudRate = 9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;
USART_InitStructure.USART_StopBits = USART_StopBits_1;
USART_InitStructure.USART_Parity = USART_Parity_No;
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USART1, &USART_InitStructure);
// Enable USART interrupt
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
//USART_ITConfig(USART1, USART_IT_TXE, ENABLE);
// Enable USART
USART_Cmd(USART1, ENABLE);
#if defined(INNO_DEBUG)
USART1_SendDataStrings("USART1 CMD enabled! \n");
#endif
// Initialize USART interrupt on NVIC
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0xF;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
#if defined(INNO_DEBUG)
USART1_SendDataStrings("USART1 NVIC enabled! \n");
#endif
}
void USART_Config()
{
USART_Config_USART1();
}
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
/* USART configuration */
USART_Config();
#if defined(INNO_DEBUG)
USART1_SendDataStrings("USART configuration finished! \n");
#endif
// Enable USART interrupt
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
//USART_ITConfig(USART1, USART_IT_TXE, ENABLE);
// Enable USART
USART_Cmd(USART1, ENABLE);
#if defined(INNO_DEBUG)
USART1_SendDataStrings("USART1 CMD enabled! \n");
#endif
// Initialize USART interrupt on NVIC
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0x0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0xF;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
问题: 使能中断不能在使能NVIC 表格之前
还不行,把Rx设置成上拉试试,我一直都是Rx跟Tx都上拉。
DR 接收数据正确
SR RXNE = 0 始终
// Enable USART clock
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
容易出错的地方,看看参考手册
#define RCC_AHB1Periph_GPIOA ((uint32_t)0x00000001)
应该也没有问题