#include?
#include?“RFID.h“
#include?
#include?

void?writeMFRC522（unsigned?char?Address?unsigned?char?value）;
void?antennaOn（void）;
void?RFID_init（）
{
	bcm2835_spi_begin（）;
?
	bcm2835_spi_setBitOrder（BCM2835_SPI_BIT_ORDER_MSBFIRST）;
	bcm2835_spi_setDataMode（BCM2835_SPI_MODE0）;
	bcm2835_spi_setClockDivider（BCM2835_SPI_CLOCK_DIVIDER_65536）;
	bcm2835_spi_chipSelect（BCM2835_SPI_CS0）;
	bcm2835_spi_setChipSelectPolarity（BCM2835_SPI_CS0?LOW）;
?
	writeMFRC522（CommandReg?PCD_RESETPHASE）;
	writeMFRC522（TModeReg?0x8D）;
	writeMFRC522（TPrescalerReg?0x3E）;
	writeMFRC522（TReloadRegL?30）;
	writeMFRC522（TReloadRegH?0）;
	writeMFRC522（TxAutoReg?0x40）;
	writeMFRC522（ModeReg?0x3D）;
	antennaOn（）;
}

void?writeMFRC522（unsigned?char?Address?unsigned?char?value）
{
????char?buff[2];
????buff[0]?=?（char）（（Address<<1）&0x7E）;
????buff[1]?=?（char）value;
????
????bcm2835_spi_transfern（buff2）;?
}

unsigned?char?readMFRC522（unsigned?char?Address）
{
????char?buff[2];
????buff[0]?=?（（Address<<1）&0x7E）|0x80;
????bcm2835_spi_transfern（buff2）;
????return?（uint8_t）buff[1];
}

void?setBitMask（unsigned?char?reg?unsigned?char?mask）
{
	unsigned?char?tmp;
	tmp?=?readMFRC522（reg）;
	writeMFRC522（reg?tmp?|?mask）;
}

void?clearBitMask（unsigned?char?reg?unsigned?char?mask）
{
	unsigned?char?tmp;
	tmp?=?readMFRC522（reg）;
	writeMFRC522（reg?tmp?&?（~mask））;
}

void?antennaOn（void）
{
	unsigned?char?temp;
	temp?=?readMFRC522（TxControlReg）;
	if（!（temp?&?0x03））
	{
		setBitMask（TxControlReg?0x03）;
	}
}

void?antennaOff（void）
{
	unsigned?char?temp;
	temp?=?readMFRC522（TxControlReg）;
	if（!（temp?&?0x03））
	{
		clearBitMask（TxControlReg?0x03）;
	}
}

void?calculateCRC（unsigned?char?*pIndata?unsigned?char?len?unsigned?char?*pOutData）
{
	unsigned?char?i?n;
	clearBitMask（DivIrqReg?0x04）;
	setBitMask（FIFOLevelReg?0x80）;
	for?（i=0;?i	{
		writeMFRC522（FIFODataReg?*（pIndata+i））;
	}
	writeMFRC522（CommandReg?PCD_CALCCRC）;
	i?=?0xFF;
	do
	{
		n?=?readMFRC522（DivIrqReg）;
		i--;
	}
	while?（（i!=0）?&&?!（n&0x04））;
	pOutData[0]?=?readMFRC522（CRCResultRegL）;
	pOutData[1]?=?readMFRC522（CRCResultRegM）;
}

unsigned?char?MFRC522ToCard（unsigned?char?command?unsigned?char?*sendData?unsigned?char?sendLen?unsigned?char?*backData?unsigned?int?*backLen）
{
	unsigned?char?status?=?MI_ERR;
	unsigned?char?irqEn?=?0x00;
	unsigned?char?waitIRq?=?0x00;
	unsigned?char?lastBits;
	unsigned?char?n;
	unsigned?int?i;
	switch（command）
	{
		case?PCD_AUTHENT:?????//認證卡密
		{
			irqEn?=?0x12;
			waitIRq?=?0x10;
			break;
		}
		case?PCD_TRANSCEIVE:??//發送FIFO中數據
		{
			irqEn?=?0x77;
			waitIRq?=?0x30;
			break;
		}
		default:
			break;
??}
	writeMFRC522（CommIEnReg?irqEn|0x80）;?//允許中斷請求
	clearBitMask（CommIrqReg?0x80）;???????//清除所有中斷請求位
	setBitMask（FIFOLevelReg?0x80）;???????//Flush