如題，通過USB轉(zhuǎn)串口，發(fā)送數(shù)據(jù)，INI腳一直處于高電平狀態(tài)，不響應(yīng)中斷程序

您好，您可以看一下你使用的串口的IER寄存器與MCR寄存器配置是否正確。如果想要發(fā)送報中斷的話，那么IER寄存器的IETHRE位必須設(shè)置為1，這樣才會允許發(fā)送保存寄存器空中斷。其次MCR寄存器的OUT2位要設(shè)置為1，這樣該串口的中斷才會有低電平的輸出。

串口的IER和MCR寄存器均參照51Demo移植，使能了IER中斷接收和MCR中斷輸出，發(fā)送數(shù)據(jù)還是產(chǎn)生不了中斷

以下為串口初始化配置：

void?CH438_Uart_Init(unsigned?char?num,unsigned?long?value)
{
????CH438_Uart_SetBandrate(num,?value);
????CH438_Uart_TranConfig(num);
????CH438_Uart_INTConfig(num);
}

void?CH438_Uart_SetBandrate(unsigned?char?num,?unsigned?long?value)
{
????uint16_t?div;
????uint8_t?DLL,?DLM;
????
????div?=?Fpclk/16/value;
????DLM?=?div>>8;
????DLL?=?div&0xff;
????
????CH438_WriteReg(offsetadd[num]|REG_LCR_ADDR,?BIT_LCR_DLAB);
????CH438_WriteReg(offsetadd[num]|REG_DLL_ADDR,?DLL);
????CH438_WriteReg(offsetadd[num]|REG_DLM_ADDR,?DLM);
}

void?CH438_Uart_TranConfig(unsigned?char?num)
{

????CH438_WriteReg(offsetadd[num]|REG_FCR_ADDR,?BIT_FCR_RECVTG1?|?BIT_FCR_RECVTG0?|?BIT_FCR_FIFOEN);
????

????CH438_WriteReg(offsetadd[num]|REG_LCR_ADDR,?BIT_LCR_WORDSZ1?|?BIT_LCR_WORDSZ0);
}

void?CH438_Uart_INTConfig(unsigned?char?num)
{

????CH438_WriteReg(offsetadd[num]|REG_IER_ADDR,BIT_IER_IELINES?|?BIT_IER_IETHRE?|?BIT_IER_IERECV);

????CH438_WriteReg(offsetadd[num]|REG_MCR_ADDR,BIT_MCR_OUT2/*?|?BIT_MCR_RTS?|?BIT_MCR_DTR*/);

????CH438_WriteReg(offsetadd[num]|REG_FCR_ADDR,?CH438_ReadReg(offsetadd[num]|REG_FCR_ADDR)|?BIT_FCR_TFIFORST?|?BIT_FCR_RFIFORST);
}

那您可以看一下您的接口時序是否正確，您可以發(fā)送數(shù)據(jù)到SCR寄存器，再讀取看是否為剛剛寫入的數(shù)據(jù)，如果不一致，則表示時序有問題。