AS393x_FW_Sources_1.0.2.zip源码

PIC单片机控制AS3933接收和发送 IRQ_COUNT = 0; // all I/O digital AD1PCFG = 0xFFFF; // set as output TRISA = ~0x001C; TRISB = ~0xE01F; // turn on internal pull ups for switch BUTTON_INTERNAL_PULL_UP = 1; EXT_INT_VBUS_INTERNAL_PULL_UP = 0; // set up spi interface /* route SDI1 to pin RP5 (RA0) */ RPINR20bits.SDI1R = 5; /* route pin RP4 (RB4) to SDO1 */ RPOR2bits.RP4R = 7; /* route pin RP3 (RB3) to SCK1 */ RPOR1bits.RP3R = 8; // /* route pin RP2 (RB2) to SS1 */ // RPOR1bits.RP2R = 9; // enable external interrupt for wake pin /* route INT1 to pin RP8 () */ RPINR0bits.INT1R = 8; INTCON2bits.INT1EP = 0; // on positive edge IPC5bits.INT1IP = 3; // middle priority IFS1bits.INT1IF = 0; // clear pending interrupts IEC1bits.INT1IE = 1; // enable interrupt // enable capture for frequency measurement (CL_DAT, 32 kHz oscillator) /* route IC1 to pin RP6 (RA1) */ RPINR7bits.IC1R = 6; // IC1 gets set up every time we need it //IPC0bits.IC1IP = 4; // middle priority //IEC0bits.IC1IE = 1; // enable interrupt // enable capture for frequency measurement (DAT, LFxP on LCO (125 kHz)) /* route IC2 to pin RP7 (RB7) */ RPINR7bits.IC2R = 7;

AS3933_DS000353_1-00.pdf

The AS3933 is a 3-channel low power ASK receiver that is able to generate a wake-up upon detection of a data signal which uses a LF carrier frequency between 15-150 kHz. The integrated correlator can be used for detection of a programmable 16-bit or 32-bit Manchester wake-up pattern. The device can operate using one, two, or three active channels. The AS3933 provides a digital RSSI value for each active channel, it supports a programmable data rate and Manchester decoding with clock recovery. The AS3933 offers an internal Clock Generator, which is either derived from a crystal oscillator or the internal RC oscillator. The user can decide to use the external clock generator instead.

2011年RFID基础知识学习大全(学习手册).pdf

RFID行业的技术知识点，包括频率的划分、介绍电子标签、中间件、阅读器工作原理、防碰撞算法分类和工作原理

FAT32系统.pdf

磁盘FAT32文件系统数据结构体 硬盘由很多盘片(platter)组成，每个盘片的每个面都有一个读写磁头。如果有 N 个盘片。就有 2N 个面， 对应 2N 个磁头(Heads)，从 0、1、2 开始编号。每个盘片被划分成若干个同心圆磁道(逻辑上的，是不可见的。) 每个盘片的划分规则通常是一样的。这样每个盘片的半径均为固定值 R 的同心圆再逻辑上形成了一个以电机主轴 为轴的柱面(Cylinders)，从外至里编号为 0、1、2……每个盘片上的每个磁道又被划分为几十个扇区(Sector)， 通常的容量是 512byte，并按照一定规则编号为 1、2、3……形成 Cylinders×Heads×Sector 个扇区。这三个参 数即是硬盘的物理参数。我们下面的很多实践需要深刻理解这三个参数的意义

ICAO Doc 9303 中文护照协议.rar

国际民航组织机读旅行证件的工作始于 1968 年，当时理事会航空运输委员会成立了护照卡专家组。该专家组负 责就标准化的机读护照本或护照卡提出建议，以加快旅客在护照检查点的通关速度。该专家组提出过一些建议，其 中包括采用光学字符阅读 (OCR) 作为选定的机读技术，因为该技术成熟、经济、可靠。1980 年，该专家组编写的 规范和指导材料作为 Doc 9303 号文件第一版出版，标题为《具有机读能力的护照》，该文件成为澳大利亚、加拿大 和美国最初签发机读护照的基础。

High Security FeRAM-Based EPC C1G2.pdf

The metal-ferroelectric-metal (MFM) capacitor in the ferroelectric random access memory (FeRAM) embedded RFID chip is used in both the memory cell region and the peripheral analog and digital circuit area for capacitance parameter control. The capacitance value of the MFM capacitor is about 30 times larger than that of conventional capacitors, such as the poly-insulator-poly (PIP) capacitor and the metal-insulator-metal (MIM) capacitor. An MFM capacitor directly stacked over the analog and memory circuit region can share the layout area with the circuit region; thus, the chip size can be reduced by about 60%. The energy transformation efficiency using the MFM scheme is higher than that of the PIP scheme in RFID chips. The radio frequency operational signal properties using circuits with MFM capacitors are almost the same as or better than with PIP, MIM, and MOS capacitors. For the default value specification requirement, the default set cell is designed with an additional dummy cell.

CLRC663.pdf官方资料

The CLRC663’s internal transmitter is able to drive a reader/writer antenna designed to communicate with ISO/IEC 14443A/MIFARE cards and transponders without additional active circuitry. The digital module manages the complete ISO/IEC 14443A framing and error detection functionality (parity and CRC). The CLRC663 supports MIFARE Classic 1K, MIFARE Classic 4K, MIFARE Ultralight, MIFARE Ultralight C, MIFARE PLUS and MIFARE DESFire products. The CLRC663 supports MIFARE higher transfer speeds of up to 848 kbit/s in both directions. The CLRC663 supports layer 2 and 3 of the ISO/IEC 14443B reader/writer communication scheme except anticollision. The anticollision needs to be implemented in the firmware of the host controller as well as in the upper layers. The CLRC663 is able to demodulate and decode FeliCa coded signals.The FeliCa receiver part provides the demodulation and decoding circuitry for FeliCa coded signals. The CLRC663 handles the FeliCa framing and error detection such as CRC. The CLRC663 supports FeliCa higher transfer speeds of up to 424 kbit/s in both directions.

crc5.pdf算法表达式和代码

CRC5算法的表达式、verilog source code and the simulation result

paho.mqtt.embedded-c-master.zip

mqtt的mast嵌入式系统代码，带有操作系统 len += MQTTstrlen(options->clientID)+2; if (options->willFlag) len += MQTTstrlen(options->will.topicName)+2 + MQTTstrlen(options->will.message)+2; if (options->username.cstring || options->username.lenstring.data) len += MQTTstrlen(options->username)+2; if (options->password.cstring || options->password.lenstring.data) len += MQTTstrlen(options->password)+2;

STM串口转tcp实现Mqtt客户端.pdf

使用STM32和串口转TCPIP模块，实现MQTT客户端的通信，topic的长度不超过64字节，message最大长度不超过1024字节