谁会pn532 i2c通信例程（nfc通信模块） -

#include <hidef.h> /* common defines and macros */
#include "derivative.h" /* derivative-specific definitions */
#define WHO_AM_I 0x0F
#define CTRL_REG1 0x20
#define CTRL_REG2 0x21
#define CTRL_REG3 0x22
#define CTRL_REG4 0x23
#define CTRL_REG5 0x24
#define OUT_X_L 0x28
#define OUT_X_H 0x29
#define OUT_Y_L 0x2A
#define OUT_Y_H 0x2B
#define OUT_Z_L 0x2C
#define OUT_Z_H 0x2D
#define SlaveAddress 0xD2
//定义器件在IIC总线中的从地址,根据ALT ADDRESS地址引脚不同修改
#define SCL PTM_PTM2
#define SDA PTM_PTM5
#define SCL_dir DDRM_DDRM2
#define SDA_dir DDRM_DDRM5
#define BUS_CLOCK 48000000 //总线频率
#define OSC_CLOCK 16000000 //晶振频率
#define somenop(); asm("nop"); asm("nop");/*asm("nop");asm("nop");asm("nop");asm("nop");asm("nop");asm("nop");asm("nop");asm("nop");*/\
//asm("nop");asm("nop");asm("nop");asm("nop");asm("nop");asm("nop");asm("nop");asm("nop");asm("nop");asm("nop");\
//asm("nop");asm("nop");asm("nop");asm("nop");asm("nop");asm("nop");asm("nop");asm("nop");asm("nop");asm("nop");\
//asm("nop");asm("nop");asm("nop");asm("nop");asm("nop");asm("nop");asm("nop");asm("nop");asm("nop");asm("nop");
//asm("nop");晶振频率的倒数
char BUF[8]; //接收数据缓存区
uchar ge,shi,bai,qian,wan; //显示变量
int dis_data1,dis_data2,dis_data3;//变量
uchar TxBuf[10] = {0,0,0,0,0,0,0,0,0,0};
/*************************************************************/
/* 初始化锁相环 */
/*************************************************************/
void INIT_PLL(void)
{
CLKSEL &= 0x7f; //set OSCCLK as sysclk
PLLCTL &= 0x8F; //Disable PLL circuit
CRGINT &= 0xDF;
#if(BUS_CLOCK == 48000000)
SYNR = 0x45;
#elif(BUS_CLOCK == 40000000)
SYNR = 0x44;
#elif(BUS_CLOCK == 32000000)
SYNR = 0x43;
#elif(BUS_CLOCK == 24000000)
SYNR = 0x42;
#endif
REFDV = 0x81; //PLLCLK=2×OSCCLK×(SYNR+1)/(REFDV+1)＝64MHz ,fbus=32M
PLLCTL =PLLCTL|0x70; //Enable PLL circuit
asm NOP;
asm NOP;
while(!(CRGFLG&0x08)); //PLLCLK is Locked already
CLKSEL |= 0x80; //set PLLCLK as sysclk
}
/*************************************************************/
/* 延时函数 */
/*************************************************************/
void delay(void)
{
unsigned int i;
for(i=0;i<5000;i++);
}
/*************************************************************/
/* 初始化IIC */
/*************************************************************/
void INIT_IIC(void)
{
SCL_dir = 1;
SCL_dir = 1;
SCL = 1;
SDA = 1;
}
/*************************************************************/
/* 启动IIC */
/*************************************************************/
void I2Cstart(void)
{
SCL_dir = 1;
SDA_dir = 1;
SDA = 1;
somenop();
SCL = 1;
somenop();
somenop();
SDA = 0;
somenop();
somenop();
SCL = 0;
}
/**************************************
接收应答信号
**************************************/
void L3G4200D_RecvACK()
{
SCL_dir = 1;
SDA_dir = 0;
SCL = 1; //拉高时钟线
somenop();
somenop(); //延时
while(SDA==1);
SCL = 0; //拉低时钟线
somenop();
somenop(); //延时
}
/*************************************************************/
/* IIC发送数据 */
/*************************************************************/
void I2Csend(byte data)
{
unsigned char i=8;
SCL_dir = 1;
SDA_dir = 1;
for (i=0; i<8; i++) //8位计数器
{
SDA = (data&0x80)>>7; //送数据口
data=data<<1;
SCL = 1; //拉高时钟线
somenop();
somenop(); //延时
SCL = 0; //拉低时钟线
somenop();
somenop(); //延时
}
L3G4200D_RecvACK();
}
/*************************************************************/
/* IIC接收数据 */
/*************************************************************/
signed char I2Creceive(void)
{
byte i;
byte dat = 0;
SCL_dir = 1;
SDA_dir = 0;
for (i=0; i<8; i++) //8位计数器
{
dat <<= 1; //这里的1是 00000001
SCL = 1; //拉高时钟线
somenop();
somenop(); //延时
dat |= SDA; //读数据 SDA 00000000 or 00000001
SCL = 0; //拉低时钟线
somenop();
somenop(); //延时
}
return dat;
}
/**************************************
发送应答信号
入口参数:ack (0:ACK 1:NAK)
**************************************/
void I2Csendack(char ack)
{
SCL_dir = 1;
SDA_dir = 1;
if(ack==1)
{
SDA = 1; //写应答信号
SCL = 1; //拉高时钟线
somenop();
somenop();
SCL = 0; //拉低时钟线
somenop();
somenop();
}
else
{
SDA = 0; //写应答信号
SCL = 1; //拉高时钟线
somenop();
somenop();
SCL = 0; //拉低时钟线
somenop();
somenop();
}
}
/*************************************************************/
/* 停止IIC */
/*************************************************************/
void I2Cstop(void)
{
SCL_dir = 1;
SDA_dir = 1;
SCL = 1;
SDA = 0;
somenop();
somenop();
SDA = 1;
somenop();
somenop();
}
//单字节写入*******************************************
void Single_WriteL3G4200D(uchar REG_Address,uchar REG_data)
{
I2Cstart(); //起始信号
I2Csend(SlaveAddress); //发送设备地址+写信号
I2Csend(REG_Address); //内部寄存器地址，请参考中文pdf22页
I2Csend(REG_data); //内部寄存器数据，请参考中文pdf22页
I2Cstop(); //发送停止信号
}
//单字节读取*****************************************
uchar Single_ReadL3G4200D(uchar REG_Address)
{
uchar REG_data;
I2Cstart(); //起始信号
I2Csend(SlaveAddress); //发送设备地址+写信号
I2Csend(REG_Address); //发送存储单元地址，从0开始
I2Cstart(); //起始信号
I2Csend(SlaveAddress+1); //发送设备地址+读信号
REG_data=I2Creceive(); //读出寄存器数据
I2Csendack(1);
I2Cstop(); //停止信号
return REG_data;
}
//*************************************************
//*****************************************************************
//初始化L3G4200D，根据需要请参考pdf，第27页，进行修改************************
void InitL3G4200D()
{
Single_WriteL3G4200D(CTRL_REG1, 0x0f); // 0x0f=00001111 普通模式 X Y Z 启用。
Single_WriteL3G4200D(CTRL_REG2, 0x00); // 选择高通滤波模式和高通截止频率此为普通模式
Single_WriteL3G4200D(CTRL_REG3, 0x08); // 0x08=0000 1000 DRDY/INT2 数据准备(0: Disable; 1: Enable)默认0
Single_WriteL3G4200D(CTRL_REG4, 0x00 ); // 选择量程满量程选择（默认 00）（00：250dps)
Single_WriteL3G4200D(CTRL_REG5, 0x00); // 篎FIFO使能，高通滤波使
}
void SCI_Init()
{
SCI1BD = BUS_CLOCK/16/9600; //设置SCI1波特率为9600
SCI1CR1 = 0x00; //设置SCI1为正常模式，八位数据位，无奇偶校验
SCI1CR2 = 0x0c; //允许发送和接收数据，禁止中断功能*/
MODRR|=0X80;
}
void SCI_send(unsigned char data)
{
while(!SCI1SR1_TDRE); //等待发送数据寄存器（缓冲器）为空
SCI1DRL = data;
}
/*************************************************************/
/* 串口发送字符串函数 */
/*************************************************************/
void send_string(unsigned char *putchar)
{
while(*putchar!=0x00) //判断字符串是否发送完毕
{
SCI_send(*putchar++);
}
}
uchar SCI_receive()
{
uchar a;
while(!SCI1SR1_RDRF);
a=SCI1DRL;
return a;
}
void SCI_sendstring(unsigned char *a,unsigned char stringlen)
{
unsigned char i;
for(i=0;i<=stringlen;i++)
SCI_send(*(a++));
}
unsigned int CRC_Check(unsigned char *Buf, unsigned char crc_count)
{
unsigned short CRC_Temp;
unsigned char i,j;
CRC_Temp = 0xffff;
for (i=0;i<crc_count; i++)
{
CRC_Temp ^= Buf[i];
for(j=0;j<8;j++)
{
if (CRC_Temp & 0x01)
CRC_Temp = (CRC_Temp >>1 ) ^ 0xa001;
else
CRC_Temp = CRC_Temp >> 1;
}
}
return(CRC_Temp);
}
void WirelessSerial(int a,int b,int c,int d)
{
int num;
unsigned char *data;
unsigned char nrf_flag = 0,error;
int *pdat;
#if 1
num = (int)a; //Speed
data = (unsigned char *)&num;
TxBuf[1] = *data;
data++;
TxBuf[0] = *data;
num = (int)b; //MotorPWM
data = (unsigned char *)&num;
TxBuf[3] = *data;
data++;
TxBuf[2] = *data;
num = (int)c; //angle
data = (unsigned char *)&num;
TxBuf[5] = *data;
data++;
TxBuf[4] = *data;
num = (int)d;
data = (unsigned char *)&num;
TxBuf[7] = *data;
data++;
TxBuf[6] = *data;
#endif
num = CRC_Check(TxBuf,8);
TxBuf[8] = num & 0xFF;
TxBuf[9] = num >> 8;
SCI_sendstring(TxBuf,9);
}
void main(void)
{
DisableInterrupts;
INIT_PLL();
INIT_IIC();
SCI_Init();
InitL3G4200D();
EnableInterrupts;
for(;;)
{
BUF[0]= Single_ReadL3G4200D(OUT_X_L);
BUF[1]= Single_ReadL3G4200D(OUT_X_H);
dis_data1=(BUF[1]<<8)+BUF[0];
BUF[2]= Single_ReadL3G4200D(OUT_Y_L);
BUF[3]= Single_ReadL3G4200D(OUT_Y_H);
dis_data2=(BUF[3]<<8)+BUF[2];
BUF[4]= Single_ReadL3G4200D(OUT_Z_L);
BUF[5]= Single_ReadL3G4200D(OUT_Z_H);
dis_data3=(BUF[5]<<8)+BUF[4];
WirelessSerial(dis_data1,0,0,0);
}
}

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