我用232通讯，发现仿真时候，IO口接收不到数据。用示波器捕捉了下 MAX232的输出口 有时序的变化。想请问下大婶们 这个问题可能发生在什么位置，我以前是弄485的 232通讯是第一次用。不知道这两个在编程上面有什么区别？
void UART3_Init(unsigned short baudrate)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
// RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA, ENABLE);
// GPIO_InitStructure.GPIO_Pin = GPIO_Pin_8;
// GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
// GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
// GPIO_Init(GPIOA, &GPIO_InitStructure);
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;//推挽输出
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
RCC_APB2PeriphClockCmd( RCC_APB2Periph_GPIOA, ENABLE);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; //浮空输入
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3, ENABLE);
USART_DeInit(USART3);
USART_InitStructure.USART_BaudRate = baudrate;
USART_InitStructure.USART_WordLength = USART_WordLength_8b; //字长8
USART_InitStructure.USART_StopBits = USART_StopBits_1;//1位停止位
USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无流控制
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;//打开rx跟tx功能
USART_Init(USART3, &USART_InitStructure);//初始化
USART_Cmd(USART3, ENABLE);//启动串口
while(USART_GetFlagStatus(USART3,USART_FLAG_TC)!=SET);
USART_ClearFlag( USART3, USART_FLAG_TC );//发送完成标志
}
这个是配置口
这个是优先级配置
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
#ifdef VECT_TAB_RAM
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_3);
NVIC_InitStructure.NVIC_IRQChannel = TIM2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
NVIC_InitStructure.NVIC_IRQChannel = TIM3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
// NVIC_InitStructure.NVIC_IRQChannel = TIM4_IRQn;
// NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 3;
// NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
// NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
// NVIC_Init(&NVIC_InitStructure);
// NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
// NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0 ;
// NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
// NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
// NVIC_Init(&NVIC_InitStructure);
// USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=0 ;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);
}
void SYS_Init(void)
{
uchar i;
IO_Init(); //将相关IO口初始化
UART3_Init(9600); //将串口3波特率设为9600，且将其初始化
TIM2_Int_Init(10000-1,7200-1);//1s //将定时器2定时时间设为1秒，并将其初始化
TIM3_Int_Init(208-1,72-1);//20ms/96 //将定时器3定时时间设为20/96ms，并将其初始化
// TIM4_Int_Init(10000-1,4800-1);//0.667s //将定时器4定时时间设为0.667s
NVIC_Configuration(); //设置中断嵌套优先级
RTCInit(); //初始化RTC实时时钟，显示初始时间为2014年1月1日
Iwdg_Init(); //初始化独立看门狗
for(i=0;i<9;i++)
{
power_rule[i]=0;
power_Delay[i]=0;
}
} |
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