Interfacing the Microchip PIC1. F Microcontroller Master Synchronous Serial Port MSSP to various I2. C Devices. The Inter Integrated Circuit or I2. C read as I square C bus has been introduced in 1. Philips, and has become a de facto world standard for data exchange between Microcontroller and various devices such as temperature sensor, ADC analog to digital converter, DAC digital to analog converter, IO expander, EEPROM, and many more. With more than thousand different IC devices have been manufactured with an I2. C bus interface, making the understanding of the working principle of this I2. C bus is an essential knowledge that has to be acquired by anyone who want to involve in the embedded world professionally or just as hobbyist. In this project we will learn of how to use the powerful 8 Bit Microchip PIC1. F1. 4K2. 2 microcontroller Master Synchronous Serial Port MSSP in the I2. C master mode to control various I2. C devices simultaneously. The I2. C Bus Protocol. The I2. C bus use master and slave communication principle which mean the slave will response to any master request and only one master or one slave could use the I2. C bus at the time half duplex communication. Therefore the master and slave have to be connected known as Wired OR connection using the pull up resistors for both the I2. C serial data SDA and serial clock SCL as shown on this following picture. Pickit 2 Device List Updated' title='Pickit 2 Device List Updated' />Unlike the SPI Serial Peripheral Interface slave devices, the I2. C devices dont have the chip select CS pin where the SPI master could simply drive the CS pin to logic 0 in order to communicate with the target SPI slave device, instead in I2. C protocol the I2. C master will transmit the I2. C slave device unique address in order to communicate with it. When the I2. C bus is idle both of the SDA and SCL line will be logic 1. Main website for UBW32 project a PIC32 based UBW deisgn. Microchip Technology Inc. DS51553E PICkit 2 ProgrammerDebugger Users Guide. Blog Entry Interfacing the Microchip PIC18F Microcontroller Master Synchronous Serial Port MSSP to various I2C Devices December 11, 2011 by rwb, under Microcontroller. You can also download the firmware form the microchip web site. For Supported device list Please refer to Readme. Device Support List 2. ProgrammerToGo updated to support 3rd party PICkit 2 workalike devices with more ProgrammerToGo memory. Bug. When the I2. C master want to start communicate first it will send the START signal by putting the SDA line to logic 0 then it start to send the 7 bit I2. C slave address followed by 1 bit I2. C bus transfer direction command WRITE logic 0 or READ logic 1. Cost Of 3 Ton Air Conditioner Installed on this page. The 7 bits I2. C slave address consists of the upper 4 bits ID3, ID2, ID1, and ID0 whose are the device specific ID identification and encoded within each of the I2. Dynamic Balancing Machine Software'>Dynamic Balancing Machine Software. C slave device. The next 3 bits address is called a configurable I2. C slave device address as it depend on the address pins A2, A1, and A0 on the I2. C slave device logical input. For example if we connect the A2, A1, and A0 pins to the ground GND or logic 0, then these 3 bits become 0. VCC, then these 3 bits become 1. For example the complete I2. C slave address for writing to the Microchip 2. LC0. B EEPROM whose configurable address A2, A1, and A0 pins connected to logic 0 is 1. After the I2. C master send the I2. C slave address, then the I2. C slave address will response by pulling the SDA line to low logical 0 and this is known as the acknowledge ACK to the I2. C master. Next the I2. C master will continue send the data or terminated the communication by changing the SDA line from logic 0 to logic 1 or known as the STOP signal to all the I2. C slave devices and the I2. C bus is back to the idle state status which both of SDA and SCL line is not being driven by both of I2. C master and slave devices. In idle state the pull up resistors will pull up the SDA and SCL lines to become logic 1. The I2. C master read operation could be done by supplying the read transfer command LSB with logic 1, for example the complete I2. C slave address for reading from the Microchip 2. LC0. 2B EEPROM whose configurable address A2, A1, and A0 pins connected to logic 0 is 1. Next the I2. C master will send the not acknowledge NACK signal logic 1 to the I2. C slave before sending the STOP signal, this NACK signal usually will tell the I2. C slave device to stop transmitting any data to the I2. C master. Sometimes before the I2. C master read operation could be accomplish indirect read, we have to do the I2. C master write operation first which is used to set the I2. C slave internal register, then we send the RESTART signal condition i. STOP and START signal followed by the I2. C master read operation command. The I2. C Project. As I mention before in this project we learn to control various I2. C slave devices simultaneously using the Microchip PIC1. F1. 4K2. 2 microcontroller, now lets list down all the necessary hardware, software, and some supported documents in order to accomplish this project objective Microchip PICkit. TM Serial I2. C Demo Board, this board has Microchip 2. K I2. C 2. 4LC0. B EEPROM, MCP9. Microchip 2 Wire High Accuracy Temperature Sensor, MCP3. Microchip Low Power 1. Bit AD Converter With I2. C Interface, TC1. Microchip 1. 0 Bit Digital to Analog Converter with Two Wire Interface, and MCP2. Microchip 8 Bit IO Expander with Serial Interface. Additional SMD pull up 1. K 2 resistors for the PICKit Serial I2. C Demo Board, you need to solder these two SMD resistors on the board. PCA8. 57. 4 PhilipsNXP 8 bit IO expander for I2. C bus. One Hitachi HD4. U or compatible 21. LCD with blue backlight. SMD Resistors 1. K 1 and 4. K 1One 1. 0K Trimpot. One SMD LED 1One SMD N Channel MOSFET MMBF1. One half size breadboard for the I2. C LCDJaz. Mate 5 and 3. LM2. 58. 7 switching power supply from ermicro. PICJazz 2. 0 PIN learning board with Microchip PIC1. F1. 4K2. 2 microcontroller from ermicro. Microchip PICKit. Microchip PICKit. Microchip MPLAB IDE version 8. Microchip HI TECH C PRO for the PIC1. MCU Family Lite V9. PL3. Reference Document Microchip PIC1. F1. 4K2. 2 datasheet, Microchip 2. LC0. 2B datasheet, Microchip MCP9. Microchip MCP3. 22. Microchip TC1. 32. Microchip MCP2. 30. PhilipsNXP PCA8. The following is the complete C source code for this project. File Name i. 2cmaster. Version 1. 0. Description I2. C Master With Microchip PIC1. F1. 4K2. 2 Microcontroller. Author RWB. Target PICJazz 2. PIN Board PIC1. 8F1. K2. 2. Microchip PICKit Serial I2. C Demo Board. Philips PCA8. I2. C IO Expander and 2x. LCD. Compiler HI TECH C PRO for the PIC1. MCU Family Lite V9. Caldera Sky Islands Southwest here. PL3. IDE Microchip MPLAB IDE v. Programmer Microchip PICkit 2 Operating System Version 2. Last Updated 1. Nov 2. PIC1. 8F1. 4K2. 2 Configuration Bit. Alternative Microchip MPLAB IDE Menu Configure Configuration Bits. CONFIG1. H CONFIGURATION REGISTER 1 HIGH. FCMEN OFF Fail Safe Clock Monitor disabled. PCLKEN ON Primary Clock Enable. PLLEN OFF PLL is under software control. FOSC IRC Internal RC Oscillator. CONFIG2. L CONFIGURATION REGISTER 2 LOW. PWRTEN OFF Power Up Timer Enabled. BOREN OFF Brown out Reset disabled in hardware and software. CONFIG2. H CONFIGURATION REGISTER 2 HIGH. WDTEN OFF WDT is controlled by SWDTEN bit of the WDTCON register. CONFIG3. H CONFIGURATION REGISTER 3 HIGH. MCLRE ON MCLR pin enabled, RE3 input pin disabled. HFOFST ON Clocking the CPU without waiting for the oscillator to stabilize. CONFIG4. L CONFIGURATION REGISTER 4 LOW. XINST ON Instruction set extension and Indexed Addressing mode enabled. STVREN ON Stack fullunderflow will cause Reset. LVP ON Single Supply ICSP Enable. CONFIG5. H, CONFIG6. L, CONFIG6. H, CONFIG7. L, CONFIG7. H All Not Protected.