将DSP（28377S,HTQFP100封装的）的GPIO62,GPIO63,GPIO64,GPIO65设置位位eQEP3功能使用，正常，可以读到编码器数据。但是如果加上GPIO58,GPIO59,GPIO60,GPIO61设置位SPIB初始化，那么原来的eQEP3功能就无效了，读不到数据。加上SPIB程序后可以通过SPI读到数据，但是eQEP3读到的数据不对一直是0。
eQEP配置如下：
// 强制 62-65
// GpioCtrlRegs.GPBCSEL4.bit.GPIO62 = 2; // Core Select Register CPU1
GpioCtrlRegs.GPBGMUX2.bit.GPIO62 = 1;
GpioCtrlRegs.GPBMUX2.bit.GPIO62 = 1; //MUX POSITION 05 (Enhanced QEP1 input A)
GpioCtrlRegs.GPBDIR.bit.GPIO62 = 0; // 1=OUTput, 0=INput
GpioCtrlRegs.GPBQSEL2.bit.GPIO62 = 2;
GpioCtrlRegs.GPBCTRL.bit.QUALPRD3 = 1;//
//
// GpioCtrlRegs.GPBCSEL4.bit.GPIO63 = 2;
GpioCtrlRegs.GPBGMUX2.bit.GPIO63 = 1;
GpioCtrlRegs.GPBMUX2.bit.GPIO63 = 1;
GpioCtrlRegs.GPBDIR.bit.GPIO63 = 0; // 1=OUTput, 0=INput
GpioCtrlRegs.GPBQSEL2.bit.GPIO63 = 2;
GpioCtrlRegs.GPBCTRL.bit.QUALPRD3 = 1;
//
// GpioCtrlRegs.GPCCSEL1.bit.GPIO65 = 2;
GpioCtrlRegs.GPCGMUX1.bit.GPIO65 = 1;
GpioCtrlRegs.GPCMUX1.bit.GPIO65 = 1;
GpioCtrlRegs.GPCDIR.bit.GPIO65 = 0; // 1=OUTput, 0=INput
GpioCtrlRegs.GPCQSEL1.bit.GPIO65 = 2;
GpioCtrlRegs.GPCCTRL.bit.QUALPRD0 = 1;
EQep3Regs.QDECCTL.bit.QSRC = 0; // 00 = Quadrature count mode
EQep3Regs.QEPCTL.bit.FREE_SOFT = 3; // counters ignore debugger halt
EQep3Regs.QEPCTL.bit.PCRM = 1; // position counter reset on the maximum position
// EQep2Regs.QEPCTL.bit.PCRM = 0; // for debug reset position on index!!
// EQep2Regs.QEPCTL.bit.IEI = 3; // for debug reset position on index!!
EQep3Regs.QEPCTL.bit.IEL = 1; // z信号上升沿触发锁存
EQep3Regs.QPOSINIT = 0; // the position will be initialized to 0
EQep3Regs.QPOSMAX = 0xFFFFFFFF; // max position is the maximum possible num
EQep3Regs.QEPCTL.bit.SWI = 1; // initialize position (software init)
EQep3Regs.QEPCTL.bit.QPEN = 1; // Position counter enabled
EQep3Regs.QEPCTL.bit.SWI = 0; // clear the software init bit
SPIB配置如下：
void InitSPIB(void)
{
//
EALLOW;
// Enable the clock
CpuSysRegs.PCLKCR8.bit.SPI_B = 1; // SPI-B
//
// Configure the GPIO
//
// GPIO-60 - PIN FUNCTION = SPISIMOB
GpioCtrlRegs.GPBCSEL4.bit.GPIO60 = 0;
GpioCtrlRegs.GPBGMUX2.bit.GPIO60 = 1;
GpioCtrlRegs.GPBMUX2.bit.GPIO60 = 2;
GpioCtrlRegs.GPBDIR.bit.GPIO60 = 1;
// GPIO-61 - PIN FUNCTION = SPISOMIB
GpioCtrlRegs.GPBCSEL4.bit.GPIO61 = 0;
GpioCtrlRegs.GPBGMUX2.bit.GPIO61 = 1;
GpioCtrlRegs.GPBMUX2.bit.GPIO61 = 2;
GpioCtrlRegs.GPBDIR.bit.GPIO61 = 0;
// GPIO-58 - PIN FUNCTION = SPICLKB
GpioCtrlRegs.GPBCSEL4.bit.GPIO58 = 0;
GpioCtrlRegs.GPBGMUX2.bit.GPIO58 = 1;
GpioCtrlRegs.GPBMUX2.bit.GPIO58 = 2;
GpioCtrlRegs.GPBDIR.bit.GPIO58 = 1;
// GPIO-59 - PIN FUNCTION = SPISTEA
GpioCtrlRegs.GPBCSEL4.bit.GPIO59 = 0;
GpioCtrlRegs.GPBGMUX2.bit.GPIO59 = 1;
GpioCtrlRegs.GPBMUX2.bit.GPIO59 = 2;
GpioCtrlRegs.GPBDIR.bit.GPIO59 = 1;
GpioDataRegs.GPBSET.bit.GPIO59 = 1; // uncomment if --> Set High initially
SpibRegs.SPICCR.all = 0x000F; //下降升沿发送，上升沿接受16位数据
SpibRegs.SPICTL.bit.MASTER_SLAVE = 1; // CPU is master
SpibRegs.SPICTL.bit.TALK = 1; // Transmit enable
SpibRegs.SPICTL.bit.CLK_PHASE = 1; // Transmit enable
SpibRegs.SPIBRR =12;//6//9; // a little bit above 10MHz
SpibRegs.SPICCR.all = 0x00CF; //自测模式
SpibRegs.SPIPRI.bit.FREE = 1; // Let the SPI continue working when the debugger stops
SpibRegs.SPIFFTX.all = 0xE044; //使能FIFO TX缓冲区位4WORD
SpibRegs.SPIFFRX.all = 0x2044; //使能FIFO RX缓冲区位4WORD
SpibRegs.SPIFFCT.all = 0x0;
EDIS;
}
