UART3发送中断进不去

Lion_chang_1988 · 发表于 2015-3-17 17:49:36

各位大侠：
我UART3发送中断进不去，并且寄存器TCE一直是灰色的不能修改和清除，初始化时TXE和TC就直接被置为了，下面是我的配置程序

[mw_shl_code=c,true]void USART3_Configuration(void) { USART_InitTypeDef USART_InitStructure; USART_ClockInitTypeDef USART_ClockInitStructure; //????UART3?±?? RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE); USART_InitStructure.USART_BaudRate = 4800; USART_InitStructure.USART_Parity = USART_Parity_No; USART_InitStructure.USART_WordLength = USART_WordLength_8b; USART_InitStructure.USART_StopBits = USART_StopBits_1; 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(USART3, &USART_ClockInitStructure); USART_Init(USART3, &USART_InitStructure); USART_Cmd(USART3, ENABLE); USART_ITConfig(USART3, USART_IT_RXNE, ENABLE); USART_ClearFlag(USART3, USART_FLAG_TXE); USART_ClearFlag(USART3, USART_FLAG_TC); } [/mw_shl_code]

当执行完 [mw_shl_code=c,true]RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE); 配置时钟是TXE和TC就应经被置为了[/mw_shl_code]

Lion_chang_1988 · 发表于 2015-3-17 17:49:37

问题解决了，可不知道为什么，哪个大侠能帮忙解释一下
方法：把开发送中断USART_ITConfig(USART3, USART_IT_TC, ENABLE);改成USART_ITConfig(USART3, USART_IT_TXE, ENABLE);就能够进发送中断了，但是TXE和TC标志位始终为1，没法查询标志位来判断数据是否真的发送出去了