基于STM32的RFID子產品簡單應用
天氣冷了，更新的頻率也越來越低了，前天剛拿到一塊RFID子產品，玩了一下，這裡做個簡單的RFID刷卡點亮OLED燈分享出來吧！
話不多說，先上個效果圖看看，效果如下：
環境：
1.核心闆：STM32F103C8T6最小系統闆
2.RFID子產品：SPI接口
3.編譯環境：Keil MDK
操作步驟：
一、先把子產品和系統闆接好，接線圖如下：
RFID子產品 STM32F103C8T6最小系統闆
3.3V ----------------------------------- 3V3
RST ----------------------------------- PA12
GND ----------------------------------- GND
IRQ ----------------------------------- 不接
MISO ----------------------------------- PA11
MOSI ----------------------------------- PA8
SCK ------------------------------------ PB14
SDA ------------------------------------ PB12
自制LED燈---------------------------- PB0（+）、GND（-）
二、程式代碼
既然說了是簡單應用，那就話不多說，直接上代碼，首先看下main函數：
int main(void)
{
char status;
unsigned char snr, buf[16], TagType[2], SelectedSnr[4], DefaultKey[6] = {0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF};
delay_init();
usart_init(72,9600);
RFID_GPIO_Init();
Pcd_init();
while (1)
{
status= PcdRequest(REQ_ALL,TagType);
if(!status)
{
status = PcdAnticoll(SelectedSnr);
if(!status)
{
status=PcdSelect(SelectedSnr);
if(!status)
{
snr = 1; //扇區号1
status = PcdAuthState(KEYA, (snr*4+3), DefaultKey, SelectedSnr);// 校驗1扇區密碼，密碼位于每一扇區第3塊
{
if(!status)
{
status = PcdRead((snr*4+0), buf); // 讀卡，讀取1扇區0塊資料到buf[0]-buf[16]
//status = PcdWrite((snr*4+0), buf); // 寫卡，将buf[0]-buf[16]寫入1扇區0塊
if(!status)
{
//讀寫成功，點亮LED
LED_ON;
for(int a=0;a<16;a++)
{
printf("CardNum: %c \n",buf[a]);
}
WaitCardOff();
}
}
}
}
}
}
LED_OFF;
}
}
然後是RC522.h
/
//函數原型
/
extern char PcdReset(void);
extern void PcdAntennaOn(void);
extern void PcdAntennaOff(void);
extern char PcdRequest(unsigned char req_code,unsigned char *pTagType);
extern char PcdAnticoll(unsigned char *pSnr);
extern char PcdSelect(unsigned char *pSnr);
extern char PcdAuthState(unsigned char auth_mode,unsigned char addr,unsigned char *pKey,unsigned char *pSnr);
extern char PcdRead(unsigned char addr,unsigned char *pData);
extern char PcdWrite(unsigned char addr,unsigned char *pData);
extern char PcdValue(unsigned char dd_mode,unsigned char addr,unsigned char *pValue);
extern char PcdBakValue(unsigned char sourceaddr, unsigned char goaladdr);
extern char PcdHalt(void);
extern char PcdComMF522(unsigned char Command,
unsigned char *pInData,
unsigned char InLenByte,
unsigned char *pOutData,
unsigned int *pOutLenBit);
extern void CalulateCRC(unsigned char *pIndata,unsigned char len,unsigned char *pOutData);
extern void WriteRawRC(unsigned char Address,unsigned char value);
extern unsigned char ReadRawRC(unsigned char Address);
extern void SetBitMask(unsigned char reg,unsigned char mask);
extern void ClearBitMask(unsigned char reg,unsigned char mask);
extern char M500PcdConfigISOType(unsigned char type);
extern void delay_10ms(unsigned int _10ms);
extern void WaitCardOff(void);
/
//MF522指令字
/
#define PCD_IDLE 0x00 //取消目前指令
#define PCD_AUTHENT 0x0E //驗證密鑰
#define PCD_RECEIVE 0x08 //接收資料
#define PCD_TRANSMIT 0x04 //發送資料
#define PCD_TRANSCEIVE 0x0C //發送并接收資料
#define PCD_RESETPHASE 0x0F //複位
#define PCD_CALCCRC 0x03 //CRC計算
/
//Mifare_One卡片指令字
/
#define PICC_REQIDL 0x26 //尋天線區内未進入休眠狀态
#define PICC_REQALL 0x52 //尋天線區内全部卡
#define PICC_ANTICOLL1 0x93 //防沖撞
#define PICC_ANTICOLL2 0x95 //防沖撞
#define PICC_AUTHENT1A 0x60 //驗證A密鑰
#define PICC_AUTHENT1B 0x61 //驗證B密鑰
#define PICC_READ 0x30 //讀塊
#define PICC_WRITE 0xA0 //寫塊
#define PICC_DECREMENT 0xC0 //扣款
#define PICC_INCREMENT 0xC1 //充值
#define PICC_RESTORE 0xC2 //調塊資料到緩沖區
#define PICC_TRANSFER 0xB0 //儲存緩沖區中資料
#define PICC_HALT 0x50 //休眠
/
//MF522 FIFO長度定義
/
#define DEF_FIFO_LENGTH 64 //FIFO size=64byte
/
//MF522寄存器定義
/
// PAGE 0
#define RFU00 0x00
#define CommandReg 0x01
#define ComIEnReg 0x02
#define DivlEnReg 0x03
#define ComIrqReg 0x04
#define DivIrqReg 0x05
#define ErrorReg 0x06
#define Status1Reg 0x07
#define Status2Reg 0x08
#define FIFODataReg 0x09
#define FIFOLevelReg 0x0A
#define WaterLevelReg 0x0B
#define ControlReg 0x0C
#define BitFramingReg 0x0D
#define CollReg 0x0E
#define RFU0F 0x0F
// PAGE 1
#define RFU10 0x10
#define ModeReg 0x11
#define TxModeReg 0x12
#define RxModeReg 0x13
#define TxControlReg 0x14
#define TxAutoReg 0x15
#define TxSelReg 0x16
#define RxSelReg 0x17
#define RxThresholdReg 0x18
#define DemodReg 0x19
#define RFU1A 0x1A
#define RFU1B 0x1B
#define MifareReg 0x1C
#define RFU1D 0x1D
#define RFU1E 0x1E
#define SerialSpeedReg 0x1F
// PAGE 2
#define RFU20 0x20
#define CRCResultRegM 0x21
#define CRCResultRegL 0x22
#define RFU23 0x23
#define ModWidthReg 0x24
#define RFU25 0x25
#define RFCfgReg 0x26
#define GsNReg 0x27
#define CWGsCfgReg 0x28
#define ModGsCfgReg 0x29
#define TModeReg 0x2A
#define TPrescalerReg 0x2B
#define TReloadRegH 0x2C
#define TReloadRegL 0x2D
#define TCounterValueRegH 0x2E
#define TCounterValueRegL 0x2F
// PAGE 3
#define RFU30 0x30
#define TestSel1Reg 0x31
#define TestSel2Reg 0x32
#define TestPinEnReg 0x33
#define TestPinValueReg 0x34
#define TestBusReg 0x35
#define AutoTestReg 0x36
#define VersionReg 0x37
#define AnalogTestReg 0x38
#define TestDAC1Reg 0x39
#define TestDAC2Reg 0x3A
#define TestADCReg 0x3B
#define RFU3C 0x3C
#define RFU3D 0x3D
#define RFU3E 0x3E
#define RFU3F 0x3F
#define REQ_ALL 0x52
#define KEYA 0x60
/
//和MF522通訊時傳回的錯誤代碼
/
#define MI_OK (char)0
#define MI_NOTAGERR (char)(-1)
#define MI_ERR (char)(-2)
//
//端口定義
/
//MFRC522
#define MF522_RST_PIN GPIO_Pin_12
#define MF522_RST_PORT GPIOA
#define MF522_RST_CLK RCC_APB2Periph_GPIOA
#define MF522_MISO_PIN GPIO_Pin_11
#define MF522_MISO_PORT GPIOA
#define MF522_MISO_CLK RCC_APB2Periph_GPIOA
#define MF522_MOSI_PIN GPIO_Pin_8
#define MF522_MOSI_PORT GPIOA
#define MF522_MOSI_CLK RCC_APB2Periph_GPIOA
#define MF522_SCK_PIN GPIO_Pin_14
#define MF522_SCK_PORT GPIOB
#define MF522_SCK_CLK RCC_APB2Periph_GPIOB
#define MF522_NSS_PIN GPIO_Pin_12
#define MF522_NSS_PORT GPIOB
#define MF522_NSS_CLK RCC_APB2Periph_GPIOB
//訓示燈
#define LED_PIN GPIO_Pin_0
#define LED_PORT GPIOB
#define LED_CLK RCC_APB2Periph_GPIOB
#define RST_H GPIO_SetBits(MF522_RST_PORT, MF522_RST_PIN)
#define RST_L GPIO_ResetBits(MF522_RST_PORT, MF522_RST_PIN)
#define MOSI_H GPIO_SetBits(MF522_MOSI_PORT, MF522_MOSI_PIN)
#define MOSI_L GPIO_ResetBits(MF522_MOSI_PORT, MF522_MOSI_PIN)
#define SCK_H GPIO_SetBits(MF522_SCK_PORT, MF522_SCK_PIN)
#define SCK_L GPIO_ResetBits(MF522_SCK_PORT, MF522_SCK_PIN)
#define NSS_H GPIO_SetBits(MF522_NSS_PORT, MF522_NSS_PIN)
#define NSS_L GPIO_ResetBits(MF522_NSS_PORT, MF522_NSS_PIN)
#define READ_MISO GPIO_ReadInputDataBit(MF522_MISO_PORT, MF522_MISO_PIN)
#define LED_ON GPIO_SetBits(LED_PORT, LED_PIN)
#define LED_OFF GPIO_ResetBits(LED_PORT, LED_PIN)
/
//函數原型
/
#define TRUE 1
#define FALSE 0
void RFID_GPIO_Init(void);
void Pcd_init(void);
接着是RC522.c
#include "stm32f10x_gpio.h"
#include "stm32f10x_rcc.h"
#include "rc522.h"
#include "delay.h"
//#include <string.h>
void Pcd_init(void)
{
LED_OFF;
delay_ms(100);
PcdReset();
PcdAntennaOff();
PcdAntennaOn();
M500PcdConfigISOType( 'A' );
LED_ON;
delay_ms(100);
LED_OFF;
delay_ms(100);
LED_ON;
delay_ms(100);
LED_OFF;
}
void RFID_GPIO_Init(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
/* Enable the GPIO Clock */
RCC_APB2PeriphClockCmd(MF522_RST_CLK, ENABLE);
/* Configure the GPIO pin */
GPIO_InitStructure.GPIO_Pin = MF522_RST_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(MF522_RST_PORT, &GPIO_InitStructure);
/* Enable the GPIO Clock */
RCC_APB2PeriphClockCmd(MF522_MISO_CLK, ENABLE);
/* Configure the GPIO pin */
GPIO_InitStructure.GPIO_Pin = MF522_MISO_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(MF522_MISO_PORT, &GPIO_InitStructure);
/* Enable the GPIO Clock */
RCC_APB2PeriphClockCmd(MF522_MOSI_CLK, ENABLE);
/* Configure the GPIO pin */
GPIO_InitStructure.GPIO_Pin = MF522_MOSI_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(MF522_MOSI_PORT, &GPIO_InitStructure);
/* Enable the GPIO Clock */
RCC_APB2PeriphClockCmd(MF522_SCK_CLK, ENABLE);
/* Configure the GPIO pin */
GPIO_InitStructure.GPIO_Pin = MF522_SCK_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(MF522_SCK_PORT, &GPIO_InitStructure);
/* Enable the GPIO Clock */
RCC_APB2PeriphClockCmd(MF522_NSS_CLK, ENABLE);
/* Configure the GPIO pin */
GPIO_InitStructure.GPIO_Pin = MF522_NSS_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(MF522_NSS_PORT, &GPIO_InitStructure);
/* Enable the GPIO Clock */
RCC_APB2PeriphClockCmd(LED_CLK, ENABLE);
/* Configure the GPIO pin */
GPIO_InitStructure.GPIO_Pin = LED_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(LED_PORT, &GPIO_InitStructure);
}
#define MAXRLEN 18
/
//功 能：尋卡
//參數說明: req_code[IN]:尋卡方式
// 0x52 = 尋感應區内所有符合14443A标準的卡
// 0x26 = 尋未進入休眠狀态的卡
// pTagType[OUT]：卡片類型代碼
// 0x4400 = Mifare_UltraLight
// 0x0400 = Mifare_One(S50)
// 0x0200 = Mifare_One(S70)
// 0x0800 = Mifare_Pro(X)
// 0x4403 = Mifare_DESFire
//返 回: 成功傳回MI_OK
/
char PcdRequest(unsigned char req_code,unsigned char *pTagType)
{
char status;
unsigned int unLen;
unsigned char ucComMF522Buf[MAXRLEN];
// unsigned char xTest ;
ClearBitMask(Status2Reg,0x08);
WriteRawRC(BitFramingReg,0x07);
// xTest = ReadRawRC(BitFramingReg);
// if(xTest == 0x07 )
// { LED_GREEN =0 ;}
// else {LED_GREEN =1 ;while(1){}}
SetBitMask(TxControlReg,0x03);
ucComMF522Buf[0] = req_code;
status = PcdComMF522(PCD_TRANSCEIVE,ucComMF522Buf,1,ucComMF522Buf,&unLen);
// if(status == MI_OK )
// { LED_GREEN =0 ;}
// else {LED_GREEN =1 ;}
if ((status == MI_OK) && (unLen == 0x10))
{
*pTagType = ucComMF522Buf[0];
*(pTagType+1) = ucComMF522Buf[1];
}
else
{ status = MI_ERR; }
return status;
}
/
//功 能：防沖撞
//參數說明: pSnr[OUT]:卡片序列号，4位元組
//返 回: 成功傳回MI_OK
/
char PcdAnticoll(unsigned char *pSnr)
{
char status;
unsigned char i,snr_check=0;
unsigned int unLen;
unsigned char ucComMF522Buf[MAXRLEN];
ClearBitMask(Status2Reg,0x08);
WriteRawRC(BitFramingReg,0x00);
ClearBitMask(CollReg,0x80);
ucComMF522Buf[0] = PICC_ANTICOLL1;
ucComMF522Buf[1] = 0x20;
status = PcdComMF522(PCD_TRANSCEIVE,ucComMF522Buf,2,ucComMF522Buf,&unLen);
if (status == MI_OK)
{
for (i=0; i<4; i++)
{
*(pSnr+i) = ucComMF522Buf[i];
snr_check ^= ucComMF522Buf[i];
}
if (snr_check != ucComMF522Buf[i])
{ status = MI_ERR; }
}
SetBitMask(CollReg,0x80);
return status;
}
/
//功 能：標明卡片
//參數說明: pSnr[IN]:卡片序列号，4位元組
//返 回: 成功傳回MI_OK
/
char PcdSelect(unsigned char *pSnr)
{
char status;
unsigned char i;
unsigned int unLen;
unsigned char ucComMF522Buf[MAXRLEN];
ucComMF522Buf[0] = PICC_ANTICOLL1;
ucComMF522Buf[1] = 0x70;
ucComMF522Buf[6] = 0;
for (i=0; i<4; i++)
{
ucComMF522Buf[i+2] = *(pSnr+i);
ucComMF522Buf[6] ^= *(pSnr+i);
}
CalulateCRC(ucComMF522Buf,7,&ucComMF522Buf[7]);
ClearBitMask(Status2Reg,0x08);
status = PcdComMF522(PCD_TRANSCEIVE,ucComMF522Buf,9,ucComMF522Buf,&unLen);
if ((status == MI_OK) && (unLen == 0x18))
{ status = MI_OK; }
else
{ status = MI_ERR; }
return status;
}
/
//功 能：驗證卡片密碼
//參數說明: auth_mode[IN]: 密碼驗證模式
// 0x60 = 驗證A密鑰
// 0x61 = 驗證B密鑰
// addr[IN]：塊位址
// pKey[IN]：密碼
// pSnr[IN]：卡片序列号，4位元組
//返 回: 成功傳回MI_OK
/
char PcdAuthState(unsigned char auth_mode,unsigned char addr,unsigned char *pKey,unsigned char *pSnr)
{
char status;
unsigned int unLen;
unsigned char i,ucComMF522Buf[MAXRLEN];
ucComMF522Buf[0] = auth_mode;
ucComMF522Buf[1] = addr;
for (i=0; i<6; i++)
{ ucComMF522Buf[i+2] = *(pKey+i); }
for (i=0; i<6; i++)
{ ucComMF522Buf[i+8] = *(pSnr+i); }
// memcpy(&ucComMF522Buf[2], pKey, 6);
// memcpy(&ucComMF522Buf[8], pSnr, 4);
status = PcdComMF522(PCD_AUTHENT,ucComMF522Buf,12,ucComMF522Buf,&unLen);
if ((status != MI_OK) || (!(ReadRawRC(Status2Reg) & 0x08)))
{ status = MI_ERR; }
return status;
}
/
//功 能：讀取M1卡一塊資料
//參數說明: addr[IN]：塊位址
// pData[OUT]：讀出的資料，16位元組
//返 回: 成功傳回MI_OK
/
char PcdRead(unsigned char addr,unsigned char *pData)
{
char status;
unsigned int unLen;
unsigned char i,ucComMF522Buf[MAXRLEN];
ucComMF522Buf[0] = PICC_READ;
ucComMF522Buf[1] = addr;
CalulateCRC(ucComMF522Buf,2,&ucComMF522Buf[2]);
status = PcdComMF522(PCD_TRANSCEIVE,ucComMF522Buf,4,ucComMF522Buf,&unLen);
if ((status == MI_OK) && (unLen == 0x90))
// { memcpy(pData, ucComMF522Buf, 16); }
{
for (i=0; i<16; i++)
{ *(pData+i) = ucComMF522Buf[i]; }
}
else
{ status = MI_ERR; }
return status;
}
/
//功 能：寫資料到M1卡一塊
//參數說明: addr[IN]：塊位址
// pData[IN]：寫入的資料，16位元組
//返 回: 成功傳回MI_OK
/
char PcdWrite(unsigned char addr,unsigned char *pData)
{
char status;
unsigned int unLen;
unsigned char i,ucComMF522Buf[MAXRLEN];
ucComMF522Buf[0] = PICC_WRITE;
ucComMF522Buf[1] = addr;
CalulateCRC(ucComMF522Buf,2,&ucComMF522Buf[2]);
status = PcdComMF522(PCD_TRANSCEIVE,ucComMF522Buf,4,ucComMF522Buf,&unLen);
if ((status != MI_OK) || (unLen != 4) || ((ucComMF522Buf[0] & 0x0F) != 0x0A))
{ status = MI_ERR; }
if (status == MI_OK)
{
//memcpy(ucComMF522Buf, pData, 16);
for (i=0; i<16; i++)
{ ucComMF522Buf[i] = *(pData+i); }
CalulateCRC(ucComMF522Buf,16,&ucComMF522Buf[16]);
status = PcdComMF522(PCD_TRANSCEIVE,ucComMF522Buf,18,ucComMF522Buf,&unLen);
if ((status != MI_OK) || (unLen != 4) || ((ucComMF522Buf[0] & 0x0F) != 0x0A))
{ status = MI_ERR; }
}
return status;
}
/
//功 能：指令卡片進入休眠狀态
//返 回: 成功傳回MI_OK
/
char PcdHalt(void)
{
unsigned int unLen;
unsigned char ucComMF522Buf[MAXRLEN];
ucComMF522Buf[0] = PICC_HALT;
ucComMF522Buf[1] = 0;
CalulateCRC(ucComMF522Buf,2,&ucComMF522Buf[2]);
PcdComMF522(PCD_TRANSCEIVE,ucComMF522Buf,4,ucComMF522Buf,&unLen);
return MI_OK;
}
/
//用MF522計算CRC16函數
/
void CalulateCRC(unsigned char *pIndata,unsigned char len,unsigned char *pOutData)
{
unsigned char i,n;
ClearBitMask(DivIrqReg,0x04);
WriteRawRC(CommandReg,PCD_IDLE);
SetBitMask(FIFOLevelReg,0x80);
for (i=0; i<len; i++)
{ WriteRawRC(FIFODataReg, *(pIndata+i)); }
WriteRawRC(CommandReg, PCD_CALCCRC);
i = 0xFF;
do
{
n = ReadRawRC(DivIrqReg);
i--;
}
while ((i!=0) && !(n&0x04));
pOutData[0] = ReadRawRC(CRCResultRegL);
pOutData[1] = ReadRawRC(CRCResultRegM);
}
/
//功 能：複位RC522
//返 回: 成功傳回MI_OK
/
char PcdReset(void)
{
RST_H;
delay_ms(10);
RST_L;
delay_ms(10);
RST_H;
delay_ms(100);
if(ReadRawRC(0x02) == 0x80)
{
LED_ON;
delay_ms(100);
LED_OFF;
delay_ms(100);
LED_ON;
delay_ms(100);
LED_OFF;
delay_ms(100);
}
WriteRawRC(CommandReg,PCD_RESETPHASE);
WriteRawRC(ModeReg,0x3D); //和Mifare卡通訊，CRC初始值0x6363
WriteRawRC(TReloadRegL,30);
WriteRawRC(TReloadRegH,0);
WriteRawRC(TModeReg,0x8D);
WriteRawRC(TPrescalerReg,0x3E);
WriteRawRC(TxAutoReg,0x40);
return MI_OK;
}
//
//設定RC632的工作方式
//
char M500PcdConfigISOType(unsigned char type)
{
if (type == 'A') //ISO14443_A
{
ClearBitMask(Status2Reg,0x08);
/* WriteRawRC(CommandReg,0x20); //as default
WriteRawRC(ComIEnReg,0x80); //as default
WriteRawRC(DivlEnReg,0x0); //as default
WriteRawRC(ComIrqReg,0x04); //as default
WriteRawRC(DivIrqReg,0x0); //as default
WriteRawRC(Status2Reg,0x0);//80 //trun off temperature sensor
WriteRawRC(WaterLevelReg,0x08); //as default
WriteRawRC(ControlReg,0x20); //as default
WriteRawRC(CollReg,0x80); //as default
*/
WriteRawRC(ModeReg,0x3D);//3F
/* WriteRawRC(TxModeReg,0x0); //as default???
WriteRawRC(RxModeReg,0x0); //as default???
WriteRawRC(TxControlReg,0x80); //as default???
WriteRawRC(TxSelReg,0x10); //as default???
*/
WriteRawRC(RxSelReg,0x86);//84
// WriteRawRC(RxThresholdReg,0x84);//as default
// WriteRawRC(DemodReg,0x4D); //as default
// WriteRawRC(ModWidthReg,0x13);//26
WriteRawRC(RFCfgReg,0x7F); //4F
/* WriteRawRC(GsNReg,0x88); //as default???
WriteRawRC(CWGsCfgReg,0x20); //as default???
WriteRawRC(ModGsCfgReg,0x20); //as default???
*/
WriteRawRC(TReloadRegL,30);//tmoLength);// TReloadVal = 'h6a =tmoLength(dec)
WriteRawRC(TReloadRegH,0);
WriteRawRC(TModeReg,0x8D);
WriteRawRC(TPrescalerReg,0x3E);
// PcdSetTmo(106);
delay_ms(10);
PcdAntennaOn();
}
else{ return (char)-1; }
return MI_OK;
}
/
//功 能：讀RC632寄存器
//參數說明：Address[IN]:寄存器位址
//返 回：讀出的值
/
unsigned char ReadRawRC(unsigned char Address)
{
unsigned char i, ucAddr;
unsigned char ucResult=0;
NSS_L;
ucAddr = ((Address<<1)&0x7E)|0x80;
for(i=8;i>0;i--)
{
SCK_L;
if(ucAddr&0x80)
MOSI_H;
else
MOSI_L;
SCK_H;
ucAddr <<= 1;
}
for(i=8;i>0;i--)
{
SCK_L;
ucResult <<= 1;
SCK_H;
if(READ_MISO == 1)
ucResult |= 1;
}
NSS_H;
SCK_H;
return ucResult;
}
/
//功 能：寫RC632寄存器
//參數說明：Address[IN]:寄存器位址
// value[IN]:寫入的值
/
void WriteRawRC(unsigned char Address, unsigned char value)
{
unsigned char i, ucAddr;
SCK_L;
NSS_L;
ucAddr = ((Address<<1)&0x7E);
for(i=8;i>0;i--)
{
if(ucAddr&0x80)
MOSI_H;
else
MOSI_L;
SCK_H;
ucAddr <<= 1;
SCK_L;
}
for(i=8;i>0;i--)
{
if(value&0x80)
MOSI_H;
else
MOSI_L;
SCK_H;
value <<= 1;
SCK_L;
}
NSS_H;
SCK_H;
}
/
//功 能：置RC522寄存器位
//參數說明：reg[IN]:寄存器位址
// mask[IN]:置位值
/
void SetBitMask(unsigned char reg,unsigned char mask)
{
char tmp = 0x0;
tmp = ReadRawRC(reg);
WriteRawRC(reg,tmp | mask); // set bit mask
}
/
//功 能：清RC522寄存器位
//參數說明：reg[IN]:寄存器位址
// mask[IN]:清位值
/
void ClearBitMask(unsigned char reg,unsigned char mask)
{
char tmp = 0x0;
tmp = ReadRawRC(reg);
WriteRawRC(reg, tmp & ~mask); // clear bit mask
}
/
//功 能：通過RC522和ISO14443卡通訊
//參數說明：Command[IN]:RC522指令字
// pInData[IN]:通過RC522發送到卡片的資料
// InLenByte[IN]:發送資料的位元組長度
// pOutData[OUT]:接收到的卡片傳回資料
// *pOutLenBit[OUT]:傳回資料的位長度
/
char PcdComMF522(unsigned char Command,
unsigned char *pInData,
unsigned char InLenByte,
unsigned char *pOutData,
unsigned int *pOutLenBit)
{
char status = MI_ERR;
unsigned char irqEn = 0x00;
unsigned char waitFor = 0x00;
unsigned char lastBits;
unsigned char n;
unsigned int i;
switch (Command)
{
case PCD_AUTHENT:
irqEn = 0x12;
waitFor = 0x10;
break;
case PCD_TRANSCEIVE:
irqEn = 0x77;
waitFor = 0x30;
break;
default:
break;
}
WriteRawRC(ComIEnReg,irqEn|0x80);
ClearBitMask(ComIrqReg,0x80);
WriteRawRC(CommandReg,PCD_IDLE);
SetBitMask(FIFOLevelReg,0x80);
for (i=0; i<InLenByte; i++)
{ WriteRawRC(FIFODataReg, pInData[i]); }
WriteRawRC(CommandReg, Command);
if (Command == PCD_TRANSCEIVE)
{ SetBitMask(BitFramingReg,0x80); }
// i = 600;//根據時鐘頻率調整，操作M1卡最大等待時間25ms
i = 2000;
do
{
n = ReadRawRC(ComIrqReg);
i--;
}
while ((i!=0) && !(n&0x01) && !(n&waitFor));
ClearBitMask(BitFramingReg,0x80);
if (i!=0)
{
if(!(ReadRawRC(ErrorReg)&0x1B))
{
status = MI_OK;
if (n & irqEn & 0x01)
{ status = MI_NOTAGERR; }
if (Command == PCD_TRANSCEIVE)
{
n = ReadRawRC(FIFOLevelReg);
lastBits = ReadRawRC(ControlReg) & 0x07;
if (lastBits)
{ *pOutLenBit = (n-1)*8 + lastBits; }
else
{ *pOutLenBit = n*8; }
if (n == 0)
{ n = 1; }
if (n > MAXRLEN)
{ n = MAXRLEN; }
for (i=0; i<n; i++)
{ pOutData[i] = ReadRawRC(FIFODataReg); }
}
}
else
{ status = MI_ERR; }
}
SetBitMask(ControlReg,0x80); // stop timer now
WriteRawRC(CommandReg,PCD_IDLE);
return status;
}
/
//開啟天線
//每次啟動或關閉天險發射之間應至少有1ms的間隔
/
void PcdAntennaOn()
{
unsigned char i;
i = ReadRawRC(TxControlReg);
if (!(i & 0x03))
{
SetBitMask(TxControlReg, 0x03);
}
}
/
//關閉天線
/
void PcdAntennaOff()
{
ClearBitMask(TxControlReg, 0x03);
}
//等待卡離開
void WaitCardOff(void)
{
char status;
unsigned char TagType[2];
while(1)
{
status = PcdRequest(REQ_ALL, TagType);
if(status)
{
status = PcdRequest(REQ_ALL, TagType);
if(status)
{
status = PcdRequest(REQ_ALL, TagType);
if(status)
{
return;
}
}
}
delay_ms(100);
}
}
當然RFID子產品點燈隻是入門，隻要用心網上找找就會有一大堆的例程，我也是參考了一些，這裡隻是個開始，後面想深入了解做智能門禁，智能讀寫卡器和圖書管理刷卡系統之類的需要了解IC卡的和RFID子產品的工作原理，加上手機軟體或者小程式的控制就更完美了，想想就很激動，同時歡迎朋友們在評論區互相交流學習。
![視窗看門狗WWDG[圖]](data:image/gif;base64,R0lGODlhAQABAIAAAP///wAAACwAAAAAAQABAAACAkQBADs=)