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#include "led.h"

#include "delay.h"

#include "sys.h"

#include "usart.h"

#define PRESET_VALUE 0xFFFF

#define POLYNOMIAL  0x8408

unsigned int uiCrc16Cal(unsigned char const  * pucY, unsigned char ucX)

{

unsigned char ucI,ucJ;

unsigned short int  uiCrcValue = PRESET_VALUE;//short int 是16位长的用来保存CRC16返回值的

    for(ucI = 0; ucI < ucX; ucI++)

  {

  uiCrcValue = uiCrcValue ^ *(pucY + ucI);//异或运算相同为0不同1

    for(ucJ = 0; ucJ < 8; ucJ++)

   {

if(uiCrcValue & 0x0001)

  {

    uiCrcValue = (uiCrcValue >> 1) ^ POLYNOMIAL;

  }

else

  {

    uiCrcValue = (uiCrcValue >> 1);

  }

}

  }

return uiCrcValue;

}

 int main(void)

 {

u8 t;

unsigned short int crc16;

unsigned char lsb,msb;

  //unsigned char buf_ReadEPC[5] = {0x04,0x00,0x01,0x00,0x00};//读取标签的EPC号  5

//unsigned char buf_readerget[]={0x04,0x00,0x21,0x00,0x00};//读取读写器信息    5

//unsigned char buf_getTID[]={0x06,0x00,0x01,0x00,0x06,0xFA,0x34};//查询TID    7

//unsigned char buf_readresver[13]={0x0C,0x00,0x02,0x00,0x00,0x00,0x04,0x00,0x00,0x00,0x00,0x3E,0xA4};//读取保留区数据    13

unsigned char buf_writeresver[21]={0x14,0x00,0x03,0x04,0x00,0x00,0x00,0x11,0x22,0x33,0x44,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x9C,0xB5};//写入保留区数据    21     

//unsigned char buf_WriteEPC[22]={0x15,0x00,0x04,0x06,0x00,0x00,0x00,0x00,0xE2,0x80,0x68,0x10,0x20,0x00,0x00,0x01,0x0D,0xD1,0x5E,0xF4,0x05,0x93};//写入EPC号       22

delay_init();     //延时函数初始化

NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);// 设置中断优先级分组2

uart_init(9600); //串口初始化为9600

LED_Init();   //初始化与LED连接的硬件接口 

  crc16=uiCrc16Cal(buf_writeresver,19);

lsb=crc16 & 0x00ff;

msb=crc16 >> 8;

buf_writeresver[19] = lsb;

buf_writeresver[20] = msb;

while(1)

{

delay_ms(2000);

for(t=0;t<21;t++)

{

USART1->DR=buf_writeresver[t];

while((USART1->SR&0X40)==0);//等待发送结束

}

}

}  

与读头RD915通讯需要进行CRC16校验

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