(5)?DSP28335--SCI

?(2016-07-01 22:39:13)

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分類：?DSP學習

對于28335---SCI編程例程

1 ?SCI模塊初始化(主頻100M)

在main函數的初始化外設中設置SCI模塊，這里使用SCIA僅用于接收；

SCIC采用中斷接收，定時發送；

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//----------------------------------------------------------

使能SCI外設時鐘

{

???SysCtrlRegs.PCLKCR0.bit.SCIAENCLK = 1; ??// SCI-A

???SysCtrlRegs.PCLKCR0.bit.SCICENCLK = 1; ??// SCI-A

}

//-----------------------------------------------------------

?//設置SCI模塊

void InitSCI()

{

SCIC

???ScicRegs.SCICCR.all =0x0007; ??// 1 stop bit, ?No loopback?

??????????????????????????????????// No parity,8 char bits,

??????????????????????????????????// async mode, idle-line protocol

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???ScicRegs.SCICTL1.all =0x0003; ?// enable TX, RX, internal SCICLK,

??????????????????????????????????// Disable RX ERR, SLEEP, TXWAKE

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???ScicRegs.SCICTL2.bit.TXINTENA =1;//enable TXRDY isr

???ScicRegs.SCICTL2.bit.RXBKINTENA =1;//enable RXBKINTENA isr

??

???ScicRegs.SCIHBAUD = 0x0000;

???ScicRegs.SCILBAUD = 0x001a; ??????//25MHZ ?115200bps

??

???ScicRegs.SCIFFTX.all=0xE000;

???ScicRegs.SCIFFRX.all=0x2028;//收取8個字符后進中斷

???ScicRegs.SCIFFCT.all=0x00;

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???ScicRegs.SCICTL1.all =0x0023; ????// Relinquish SCI from Reset

}

//----------------------------------------------------

{// GPIO28-29設置成SCIA

???GpioCtrlRegs.GPAPUD.bit.GPIO28=0; ????????//使能GPIO28內部上拉電阻

???GpioCtrlRegs.GPAPUD.bit.GPIO29=0; ????????//使能GPIO29內部上拉電阻

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???GpioCtrlRegs.GPAQSEL2.bit.GPIO28=3; ??????//異步輸入

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???GpioCtrlRegs.GPAMUX2.bit.GPIO28=1; ??????//GPIO28=SCIRXDA

???GpioCtrlRegs.GPAMUX2.bit.GPIO29=1; ??????//GPIO29=SCITXDA

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???//GPIO62設置成SCICRX

???GpioCtrlRegs.GPBPUD.bit.GPIO62=0; ????????//使能GPIO62內部上拉電阻

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???GpioCtrlRegs.GPBQSEL2.bit.GPIO62=3; ??????//異步輸入

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???GpioCtrlRegs.GPBMUX2.bit.GPIO62=1; ??????//GPIO62=SCIRXDC

}

//----------------------------------------------------------------------

{

EALLOW;

PieVectTable.SCIRXINTC = &scicRxFifoIsr;

?????????EDIS; ??// This is needed to disable write to EALLOW protected registers

IER |=M_INT8;

PieCtrlRegs.PIEIER8.bit.INTx5=1; ????//PIE Group 8, INT5

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}

//-----------------------------------------------------

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中斷函數接收數據

interrupt void scicRxFifoIsr(void)

{

???Uint16 j;

DINT;

for(j = 0; j < 8; j++)

{

??scicTempBuf[j] = ScicRegs.SCIRXBUF.all; // Read data ?一幀數據包包含16個字節

}

scicRecIntFlag = 1; //接收中斷標志

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ScicRegs.SCIFFRX.bit.RXFFOVRCLR = 1; ??// Clear Overflow flag

ScicRegs.SCIFFRX.bit.RXFFINTCLR = 1; ??// Clear Interrupt flag

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PieCtrlRegs.PIEACK.all |= 0x080; ??????// Issue PIE ack

EINT;

}

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//----------------------------------------------

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