I2c answers some of the problems of spi including no multimaster mode, no slave flow control and more pins to use. Next, we will examine the use of i2c on the picmicro microcontroller. Support multimasterslave mode with 7bit10bit addressing. Pic24 peripherals uart i2c and spi microchip technology. This was originally written as the firmware for a robot capable of shooting pingpong balls into a goal indicated by infrared led beacons, and used two wiimote ir sensors like the those found here to get position and angle meaurements to the ir led. This section of the manual contains the following topics. I2c master mode i2 c master mode microchip technology. Read from one register in a device s a6 a5 a4 a3 a2 a1 a0 0 device slave address7 bits b7 b6 b5 b4 b3 b2 b1 b0 a register address n 8 bits a start ack ack. Figure 1 shows a typical i2c bus for an embedded system, where multiple slave devices are used. Data can flow in any direction on the i2c bus, but when it flows is controlled by the master device. Send the appropriate i2c commands to initialize the. It is written in c for the pic processor, but should be applicable to most.
In this example, the message will read a specified byte from a 24lc256 i2c serial eeprom. I2c communication with pic microcontroller mplab xc8. Hi guys, i couldnt find an i2c library for the pic24f, so i wrote one over the last 4 days. The microcontroller represents the i2c master, and controls the. Using the pic microcontroller ssp for slave i2c communication.
I2c i2c overviewoverview l i2c is a bidirectional protocol l data is sent either direction on the serial data line sda by the master or slave. May 20, 2014 abstract modern microcontrollers provide an amazingly diverse selection of hardware peripherals, all within a single chip. A tutorial guide to programming pic18, pic24 and atmega microcontrollers with flashforth. The raspberry pi is the master and the pic is the s. I2c driver written for the purpose of the byu me 495r mechatronics class by gellings, emros, and superjax. Jacobs school of mechanical and mining engineering the university of queensland. This implements the master side using blocking style function calls. But in terms of speed, spi is still faster due to its pushpull driver compared to the opencollector driver for i2c. Capacitance to digital converter and the microchip pic 18f4520 as examples, this application. In this presentation we will connect a serial eeprom. This chapter of the presentation will introduce you to the i2c protocol and its concepts. Integrating a microcontroller with a i2c peripheral device. I is a bidirectional protocol i2c is a bidirectional protocol. In this tutorial we will learn how to operate mssp module of pic microcontroller as i2c master or slave.
The uart, or universal asynchronous receiver transmitter, is a feature of your microcontroller useful for communicating serial data text, numbers, etc. Contribute to friend0pic24 development by creating an account on github. This is tested working code, but no guarantees are given. A tutorial guide to programming pic18, pic24 and atmega. The interintegrated circuit i2c module is a serial interface useful for communicating with. In this experiment, we will cover an overview of i2c protocol, its implementation in pic microcontrollers, and the method of connecting single. An introductory course in microcontrollers, with accompanying book and software libraries microcontrollers.
Interintegrated circuit i2c communication embedded lab. Using the pic devices ssp and mssp modules for slave i2c. I2c communication using pic16f877a microcontroller youtube. I2c library for pic24f a robust implementation enjoy. A slave cannot initiate a transfer over the i2c bus, only a master can do that. Many possibilities exist and they will be discussed in detail in the manual for the device you are interfacing to. Highspeed mode for more demanding applications the mid range pic wont be up this mode yet. This document supersedes the following pic24 and dspic dsc family reference manual sections. C, i2c, or iic is the serial bidirectional twowire communication. Im new to pics and pic programming but im working on a little project to try get a pic24f32ka301 to communicate with a raspberry pi using i2c.
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