TMS320F28335 串口 SCI

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 PIE block
PieCtrlRegs.PIEIER9.bit.INTx1=1; // PIE Group 9, int1
PieCtrlRegs.PIEIER9.bit.INTx2=1; // PIE Group 9, INT2
PieCtrlRegs.PIEIER9.bit.INTx3=1; // PIE Group 9, INT3
PieCtrlRegs.PIEIER9.bit.INTx4=1; // PIE Group 9, INT4
IER = 0x100; // Enable CPU INT
EINT;

。。。。串口OK了