28335向SCITXBUF写入数据的时候TXRDY为什么没有变低，empty位变高了

user1900697

SCITXBUF is written to; thus, (1) the transmitter is no longer empty, and (2) TXRDY goes low.

初始化如下：

void InitScib(void)
{
ScibRegs.SCICCR.bit.STOPBITS=1; //1位停止位
ScibRegs.SCICCR.bit.PARITYENA=0; //禁止极性功能
ScibRegs.SCICCR.bit.LOOPBKENA=0; //禁止回送测试模式功能
ScibRegs.SCICCR.bit.ADDRIDLE_MODE=0; //空闲线模式
ScibRegs.SCICCR.bit.SCICHAR=7; //8位数据位

ScibRegs.SCICTL1.bit.TXENA=1; //Scib模块的发送使能
ScibRegs.SCICTL1.bit.RXENA=1; //Scib模块的接收使能

ScibRegs.SCIHBAUD=0;
ScibRegs.SCILBAUD=0xF3; //波特率为19200

ScibRegs.SCICTL1.bit.SWRESET=1; //重启SCI
}

11 年多前

0 Chen Jones 11 年多前

Genius 3875 points

请参考TI官方SCI的初始化程序：

void scib_fifo_init()
{
   ScibRegs.SCICCR.all =0x0007;    // 1 stop bit, No loopback
                                   // No parity,8 char bits,
                                   // async mode, idle-line protocol
   ScibRegs.SCICTL1.all =0x0003;   // enable TX, RX, internal SCICLK,
                                   // Disable RX ERR, SLEEP, TXWAKE
   ScibRegs.SCICTL2.bit.TXINTENA =1;
   ScibRegs.SCICTL2.bit.RXBKINTENA =1;
   ScibRegs.SCIHBAUD    =0x0000;
   ScibRegs.SCILBAUD    =SCI_PRD;
   ScibRegs.SCICCR.bit.LOOPBKENA =0; // Disnable loop back
   ScibRegs.SCIFFTX.all=0xC028;
   ScibRegs.SCIFFRX.all=0x0028;
   ScibRegs.SCIFFCT.all=0x00;

   ScibRegs.SCICTL1.all =0x0023;     // Relinquish SCI from Reset
   ScibRegs.SCIFFTX.bit.TXFIFOXRESET=1;
   ScibRegs.SCIFFRX.bit.RXFIFORESET=1;

}