串口1和串口2能同时工作吗？

水晶球 · 发表于 2015-9-4 09:48:20

STM32F103C8T6 USART1和USART2能同时工作吗？
USART2要怎么配置，与USART1有区别吗？

xuande · 发表于 2015-9-4 09:48:21

互相不影响、完全独立的硬件，当然能，5个、8个都行。

当年51芯片不行，因为要借用外部的定时器，不是“独立硬件”。

水晶球 · 发表于 2015-9-4 10:17:11

回复【2楼】xuande:
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USART1_Configuration();    // 串口1初始化
USART2_Configuration();    // 串口2初始化
当我这样设置时，串口1就不能工作了。

当把串口2屏蔽之后就可以工作了，所以我质疑是不是串口2的配置影响到了串口1？求助
USART1_Configuration();    // 串口1初始化
//USART2_Configuration();    // 串口2初始化

andyzhao365 · 发表于 2015-9-4 10:30:29

回复【3楼】水晶球:
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可以同时工作
USART1_Configuration();    // 串口1初始化
USART2_Configuration();    // 串口2初始化
但是只有这两行代码看不出问题来啊

逍遥居士_888 · 发表于 2015-9-4 10:36:18

当然可以
亲都是初始化可是初始化函数里面的语句可以设置呀。波特率硬件连接等用到中断还有中断不同设置。

水晶球 · 发表于 2015-9-4 13:54:57

回复【4楼】andyzhao365:
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回复【4楼】andyzhao365:
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void USART1_Configuration(void)
{
  USART_InitTypeDef USART_InitStructure;
  GPIO_InitTypeDef GPIO_InitStructure;

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE);
  USART_DeInit(USART1);
  //USART1_TX

A.9
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
  GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化PA9

  //USART1_RX

A.10
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
  GPIO_Init(GPIOA, &GPIO_InitStructure);  //初始化PA10

  USART_InitStructure.USART_BaudRate = 57600;//115200;
  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);


  USART_ClearFlag(USART1, USART_FLAG_TC);        // 清标志

  USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); // 允许接收中断
  USART_Cmd(USART1, ENABLE);                     // 使能串口

}

void USART2_Configuration(void)
{
  USART_InitTypeDef USART_InitStructure;
  GPIO_InitTypeDef GPIO_InitStructure;

  RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
  RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2 , ENABLE);

  USART_DeInit(USART2);  //复位串口2

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
  GPIO_Init(GPIOA, &GPIO_InitStructure);

  USART_InitStructure.USART_BaudRate = 57600;//115200;
  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(USART2, &USART_InitStructure);

  USART_ClearFlag(USART2, USART_FLAG_TC);        // 清标志

  USART_ITConfig(USART2, USART_IT_RXNE, ENABLE); // 允许接收中断
  USART_Cmd(USART2, ENABLE);                     // 使能串口
}

void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);

NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;   //用到串口1时，
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;   //用到串口2时，
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}

我是这样配置两个串口的，有问题吗？
我这样配置后，就出现当两个串口都打开时，串口1就不能工作了
为什么我用J-Link第一次下载进去可以执行程序，但是当我拔掉J-Link，然后重启就不能运行程序了。（我的程序有无线接收功能）

水晶球 · 发表于 2015-9-4 15:59:59

回复【5楼】逍遥居士_888:
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都设置了，还是有问题

逍遥居士_888 · 发表于 2015-9-4 16:33:32

回复【7楼】水晶球:
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仔细检查下吧一个不留神就出问题。
这两天我用2个定时器做东西，最开始不好使，后来发现是初始化那里的问题

张鋆 · 发表于 2015-9-4 19:32:44

回复【2楼】xuande:
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串口1和串口2同时通信可以吗？串口一发数据给串口2？

xuande · 发表于 2015-9-4 20:27:48

回复【9楼】张鋆:
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当然可以，
甚至可以和自己。

张鋆 · 发表于 2015-9-4 20:34:27

回复【10楼】xuande:
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我的天，这个真厉害

Caaaaaaat · 发表于 2015-9-11 20:42:32

回复【6楼】水晶球:
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nvic第0组，要不你把抢占式改0试试

fanghuiopenedv · 发表于 2015-9-14 13:54:22

void usart1_init(u32 bound)
{
    //GPIO端口设置
    GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO, ENABLE);
    //USART1_TX

A.9
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    //USART1_RX

A.10
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    //Usart1 NVIC 配置
    NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0; //1
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //1

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
NVIC_Init(&NVIC_InitStructure); //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器USART1

    //USART 初始化设置
USART_InitStructure.USART_BaudRate = bound;//一般设置为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);
    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//开启中断
    USART_Cmd(USART1, ENABLE);                    //使能串口
//USART1->CR3|=1<<7; //使能串口DMA
}

void usart2_init(u32 bound)
{
    //GPIO端口设置
    GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
USART_ClockInitTypeDef USART_ClockInitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA|RCC_APB2Periph_AFIO, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);
     //USART2_TX

A.2
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    //USART3_RX

A.3
    GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
    GPIO_Init(GPIOA, &GPIO_InitStructure);

    NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1; //0
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; //0

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
NVIC_Init(&NVIC_InitStructure); //根据NVIC_InitStruct中指定的参数初始化外设NVIC寄存器USART1

USART_InitStructure.USART_BaudRate = bound;
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_ClockInitStructure.USART_Clock = USART_Clock_Disable;
USART_ClockInitStructure.USART_CPOL = USART_CPOL_Low;
USART_ClockInitStructure.USART_CPHA = USART_CPHA_2Edge;
USART_ClockInitStructure.USART_LastBit = USART_LastBit_Disable;
USART_ClockInit(USART2, &USART_ClockInitStructure);
//---------------------------------------------------------------------------------
    USART_Init(USART2, &USART_InitStructure);
    USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//开启中断
    USART_Cmd(USART2, ENABLE);                    //使能串口
//USART2->CR3|=1<<7;//使能串口DMA
}