新手学习STM32，完成代码后发现，串口1收发正常，串口2发送不正常（仿真单步运行，数据正常；全速运行数据不对），请帮忙看看……
串口代码：
static void USART_NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
/* Configure the NVIC Preemption Priority Bits */
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0);
/* Enable the USART1 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn; //设置串口1中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* Enable the USART2 Interrupt */
NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn; //设置串口2中断
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
/***********************************************************************
* 函数名：USART_Config
* 描述 ：USART1 USART1 双串口 GPIO 配置,工作模式配置。115200 8-N-1
* 输入 ：无
* 输出 : 无
* 调用 ：外部调用
***********************************************************************/
void USART_Config(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
/* config USART1 clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2 | RCC_APB2Periph_GPIOA,ENABLE);
/* USART1 GPIO config */
/* Configure USART1 Tx (PA9)and USART2 Tx (PA2) as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure USART1 Rx (PA10)and USART2 Rx (PA3) as input floating */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* USART1 mode config */
USART_InitStructure.USART_BaudRate = 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_Cmd(USART1, ENABLE); //配置串口参数函数
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE); //使能接收中断
// USART_ITConfig(USART1, USART_IT_TC, ENABLE);
/* USART2 GPIO config */
/* Configure USART1 Tx (PA9)and USART2 Tx (PA2) as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure USART1 Rx (PA10)and USART2 Rx (PA3) as input floating */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* USART2 mode config */
USART_InitStructure.USART_BaudRate = 38400;
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_Cmd(USART2, ENABLE); //配置串口参数函数
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE); //使能接收中断
// USART_ITConfig(USART1, USART_IT_TC, ENABLE); //使能发送中断
USART_NVIC_Configuration(); //中断向量配置
}
中断代码：
u8 USART1_Rx_Data[Usart1_Rx_Len];
u8 Usart1_Rx_Flag = 0;
u8 Uasrt1_Len = 0;
u8 PC_Receive_Flag = 0;
void USART1_IRQHandler(void)
{
u8 RES = 0;
if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
{
RES=USART_ReceiveData(USART1);
Rx_Time = 0; //清空定时器
//接收数据
if((Uasrt1_Len < USART1_Rx_Data[1])&&(Usart1_Rx_Flag == 0x02))
{
USART1_Rx_Data[Uasrt1_Len+2] = RES;
Uasrt1_Len++;
}
//接受数据长度
if(Usart1_Rx_Flag == 0x01)
{
USART1_Rx_Data[1] = RES;
Usart1_Rx_Flag = 0x02;
}
//判断包头 //命令处理不完，不接新收数据
if((RES == Start_Frame) && (Usart1_Rx_Flag == 0x00)&& (PC_Receive_Flag == 0x00))
{
USART1_Rx_Data[0] = RES;
Usart1_Rx_Flag = 0x01;
Uasrt1_Len = 0;
START_TIME3; //开启定时器
}
//接受完成
if((Uasrt1_Len >= USART1_Rx_Data[1])&&(Usart1_Rx_Flag == 0x02))
{
PC_Receive_Flag = 1;
Usart1_Rx_Flag = 0;
Uasrt1_Len = 0;
STOP_TIME3;
Rx_Time =0;
}
}
USART_ClearITPendingBit(USART1, USART_IT_RXNE );
}
/**------------------------------------------------------
* 函数名：USART2_IRQHandler(void)
* 描述 ：串口中断函数
* 输入 ：无
* 输出 : 接收到的数据 ，放在数组USART_Rx_Data[]中
* 调用 ：无
**-----------------------------------------------------
*/
u8 USART2_Rx_Data[Usart2_Rx_Len];
u8 Usart2_Rx_Flag = 0;
u8 Uasrt2_Len = 0;
u8 EndDevice_Receive_Flag = 0;
void USART2_IRQHandler(void)
{
u8 RES = 0;
if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET)
{
RES=USART_ReceiveData(USART2);
Rx_Time = 0; //清空定时器
if((Uasrt2_Len < (Usart2_Rx_Len-1))&&(Usart2_Rx_Flag == 0x01))
{
USART2_Rx_Data[Uasrt2_Len+1] = RES;
Uasrt2_Len++;
}
if((RES == 0xAA) &&(Usart2_Rx_Flag == 0x00)&& (EndDevice_Receive_Flag == 0x00))//ZIGBEE包头 0xaa
{
USART2_Rx_Data[0] = RES;
Usart2_Rx_Flag = 0x01;
Uasrt2_Len = 0;
EndDevice_Receive_Flag = 0;
START_TIME3; //开启定时器
}
if((Uasrt2_Len >= (Usart2_Rx_Len-1))&&(Usart2_Rx_Flag == 0x01))
{
LED1 = ~LED1;
Usart2_Rx_Flag = 0;
Uasrt2_Len = 0;
EndDevice_Receive_Flag = 1;
STOP_TIME3;
}
}
USART_ClearITPendingBit(USART2, USART_IT_RXNE );
}
逻辑比较乱
..&& EndDevice_Receive_Flag == 0x00))//ZIGBEE包头 0xaa
{
...
EndDevice_Receive_Flag = 0;
条件为0又赋值0?
回复 板凳huo_hu 的帖子
我把EndDevice_Receive_Flag = 0; 注释掉了，结果也是一样的
在USART2_IRQHandler(void)中又添加了
if(Usart2_Rx_Flag == 0x01)
{
USART2_Rx_Data[1] = RES;
Usart2_Rx_Flag = 0x02;
}
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