pic source code for controlling an Siemens GSM modem in PPP mode, reading an RFID with 125Khz

Rfid design with only using microchip pic

1.按下一个按键读写卡中的内容。 2.不需按下按键，当卡靠近读写卡中的内容。(1. Press a button to read and write the contents of the card. 2. Do not press the button when the card is close to the contents of the reading and writing card.)