PN532 P2P模式开发

环境

硬件

2片PN532

2个串口（一般都会和PN532集成在一块PCB上）

2个串口读写器（简单来说就是电脑）

接线示意图

 软件

串口调试工具

概念简介

PN532的P2P模式有些概念需要了解一下，通道的建立需要有一方先寻找目标设备，这一方成为Initializer，也就是发起者，另一方是被动的，叫做Target，好了够了

流程

 

关键数据帧内容

1、SAMConfiguration

{0x55, 0x55, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,0x00, 0x00, 0x00, 0x00, 0xFF, 0x03, 0xFD, 0xD4, 0x14, 0x01, 0x17, 0x00}

 2、InJumpForDEP

{0x00, 0x00, 0xFF, 0x09, 0xF7, 0xD4, 0x56, 0x01, 0x00, 0x01, 0x08, 0x12,0x34, 0x56, 0x30, 0x00}

3、TgInitAsTarget

{0x00, 0x00, 0xFF, 0x27, 0xD9, 0xD4, 0x8C, 0x02, 0x08, 0x00, 0x12, 0x34, 0x56,0x40, 0x01, 0xFE, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xC0, 0xC1, 0xC2, 0xC3,0xC4, 0xC5, 0xC6, 0xC7, 0xff, 0xff, 0xaa, 0x99, 0x98, 0x77, 0x66, 0x55, 0x44,0x33, 0x22, 0x11, 0x00, 0x00, 0x0F, 0x00}

4、InDataExchange

参考如下代码

UcVec MakeDataChangeBuf(const char* data1, int& len)
{
    if (len <= 0)
        return nullptr;
    const unsigned char* data = (const unsigned char*)data1;
    UcVec res = MAKE_UCVEC();
    res->clear();
    res->push_back(0x00);
    res->push_back(0x00);
    res->push_back(0xff);
    unsigned char len1 = 3 + len;
    unsigned char lcs = 0x100 - len1;
    unsigned char dcs = 0xd4 + 0x40 + 0x01;
    res->push_back(len1);
    res->push_back(lcs);
    res->push_back(0xd4);
    res->push_back(0x40);
    res->push_back(0x01);
    for (int i = 0; i < len; i++)
    {
        dcs += data[i];
        res->push_back(data[i]);
    }
    res->push_back(0x100 - dcs);
    res->push_back(0x00);
    return res;
}

 5、TgGetData

{0x00, 0x00, 0xFF, 0x02, 0xFE, 0xD4, 0x86, 0xA6, 0x00}