/SPI初始化
void InitSPI8bit(void)
{
EALLOW;
GpioMuxRegs.GPFMUX.all |= 0x000F; // Select GPIOs to be SPI pins
EDIS;
SpiaRegs.SPICCR.bit.SPISWRESET=0; // Reset SPI
SpiaRegs.SPICCR.all=0x0007; // 8-bit character, Loopback mode disabled*
SpiaRegs.SPICTL.all=0x0006; // SPI Interrupt disabled, Master mode, Master/slave transmit enabled
SpiaRegs.SPISTS.all=0x0000;
SpiaRegs.SPIBRR=0x0026;
SpiaRegs.SPIPRI.all=0x0040;
SpiaRegs.SPICCR.all=0x0087; // Enable SPI
}
//SPI发送
void eeprom_SPI_send8(Uint16 SPITXD)
{
Uint16 SPIBUF;
SpiaRegs.SPITXBUF = SPITXD;
while(SpiaRegs.SPISTS.all == 0) {} //wait for SPI send buf blank
SPIBUF = SpiaRegs.SPIRXBUF;
}
//接收函数
Uint16 eeprom_SPI_receive(void)
{
unsigned char SPIRXD_L,SPIRXD_H;
Uint16 SPIRXD;
SpiaRegs.SPITXBUF = 0x00; //发送伪数据
while(SpiaRegs.SPISTS.bit.INT_FLAG == 0) {}
SPIRXD_H = SpiaRegs.SPIRXBUF ;
SpiaRegs.SPITXBUF = 0x00; //发送伪数据
while(SpiaRegs.SPISTS.bit.INT_FLAG == 0) {}
SPIRXD_L = SpiaRegs.SPIRXBUF ;
SPIRXD = SPIRXD_H << 8 + SPIRXD_L;
return(SPIRXD);
}
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