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TMS320F28335的串口有三个串口，SCIA，SCIB和SCIC，GPIO的管脚对应如下:
SCIA对应GPIO28/29和GPIO35/36两组可选，SCIB有四组管脚可以选择，分别是GPIO9/11,GPIO14/15,GPIO18/19,GPIO22/23,SCIC对应的是GPIO62/63。
首先需要定义管脚。
void InitSciaGpio() //初始化GPIO管脚
{
EALLOW;
//根据硬件设计决定采用GPIO28/29和GPIO35/36中的哪一组。这里以35/36为例
//定义管脚为上拉
GpioCtrlRegs.GPBPUD.bit.GPIO36 = 0;
GpioCtrlRegs.GPBPUD.bit.GPIO35 = 0;
//定义管脚为异步输入
GpioCtrlRegs.GPBQSEL1.bit.GPIO36 = 3;
//配置管脚为SCI功能管脚
GpioCtrlRegs.GPBMUX1.bit.GPIO36 = 1;
GpioCtrlRegs.GPBMUX1.bit.GPIO35 = 1;
EDIS;
}
SCIB和SCIC的配置差不多。
下来就要定义波特率等等了。例子是9600bps,1,8,n,1.
void scia_init()
{
SciaRegs.SCICCR.all =0x0007; // 1 stop bit, No loopback
// No parity,8 char bits,
// async mode, idle-line protocol
SciaRegs.SCICTL1.all =0x0003; // enable TX, RX, internal SCICLK,
// Disable RX ERR, SLEEP, TXWAKE
SciaRegs.SCICTL2.bit.TXINTENA =1; //发送中断使能
SciaRegs.SCICTL2.bit.RXBKINTENA =1;//接收中断使能
SciaRegs.SCIHBAUD =0x0001; // 9600 baud @LSPCLK = 37.5MHz.
SciaRegs.SCILBAUD =0x00E7;
SciaRegs.SCICTL1.all =0x0023; // Relinquish SCI from Reset
}
接着进行中断的配置
EALLOW; // This is needed to write to EALLOW protected registers
PieVectTable.SCIRXINTA = &sciaRxIsr;
PieVectTable.SCITXINTA = &sciaTxIsr;
PieVectTable.SCIRXINTB = &scibRxIsr;
PieVectTable.SCITXINTB = &scibTxIsr;
EDIS; // This is needed to disable write to EALLOW protected registers
上面是将SCIA和SCIB的中断服务程序连到PIE的中断表中，发生中断就会跑到你的ISR去了
下面就是开中断了。PieCtrlRegs.PIECTRL.bit.ENPIE = 1; // Enable the PIEblock
PieCtrlRegs.PIEIER9.bit.INTx1=1; // PIEGroup 9, int1
PieCtrlRegs.PIEIER9.bit.INTx2=1; // PIEGroup 9, INT2
PieCtrlRegs.PIEIER9.bit.INTx3=1; // PIEGroup 9, INT3
PieCtrlRegs.PIEIER9.bit.INTx4=1; // PIEGroup 9, INT4
IER = 0x100; // Enable CPU INT
EINT;
。。。。串口 OK 了
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