This project forked from openwch/nfc
The whole NFC solution (source code and schematic&layout) based on WCH chips
NFC-EVT是沁恒微电子在CH32通用系列单片机上实现的无需额外芯片的NFC读写方案。
NFC操作代码位于工程目录中Drivers/NFC_Reader目录下。
NFC硬件底层使用了一个高级定时器，一个通用定时器，一个DMA通道。
高级定时器做为主定时器，通用定时器做为从定时器。在主定时器每个周期PWM波发出后，从定时器计数值+1，达到从定时器设定的周期值后，进入从定时器中断。在通用定时器中断中，通过修改寄存器CHCTLRx，对高级定时器产生的PWM输出进行开关。
DMA通道为该通用定时器更新事件所对应的DMA通道。
在波形发送完成后，通用定时器切换到接收模式，进行接收。
LPCD低功耗检卡参考CH32V208 NFC双晶振低功耗检卡操作例程。
硬件相关注意事项请查看硬件设计
软件相关注意事项请查看软件设计
NFC_Reader_M1.c中为NFC M1卡操作库。
NFC_Reader.c中为NFC代码操作示例。
在NFC_Reader.c中演示了常用的读卡号、选中卡、读、写、扣款、充值等操作。
针对本方案所进行的一些测试请查看测试汇总
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