What is bit banging I2C?
The I2C bit banging is a technique for serial communi- cations using software instead of a dedicated hardware module. This means that the code controls the state of the MCU pins, related to all parameters of the signals: timing, levels and synchronization.
What is bit banging method of serial communication?
Bit Banging is technique for serial communication using software intead of dedicated hardware(MC inbuilt HW). Software directly sets and samples the state of pins on the microcontroller, and is responsible for all parameters of the signal: timing, levels, synchronization, etc.
What is I2C frame format?
I2C stands for Inter-Integrated Circuit. It is a bus interface connection protocol incorporated into devices for serial communication. It was originally designed by Philips Semiconductor in 1982. Recently, it is a widely used protocol for short-distance communication. It is also known as Two Wired Interface(TWI).
What is SPI and I2C interface?
I2C is a half-duplex communication protocol. SPI is a full-duplex commination protocol. I2C has the feature of clock stretching, which means if the slave cannot able to send fast data as fast enough then it suppresses the clock to stop the communication.
What is the speed of SPI?
The SPI bus can run at high speed, transferring data at up to 60 Mbps over short distances like between chips on a board. The bus is conceptually simple, consisting of a clock, two data lines, and a chip select signal.
What is GPIO bit banging?
Software directly sets and samples the states of GPIOs (e.g., pins on a microcontroller), and is responsible for meeting all timing requirements and protocol sequencing of the signals. Bit banging allows a device to implement different protocols with minimal or no hardware changes.
What are I2C devices?
The I2C, or inter-integrated circuit, protocol is one example of a serial protocol for devices to communicate with one another. I2C is a serial protocol because it has a clock line and single data line which is used for both sending and receiving data.
What is I2C EEPROM?
The I2C protocol is a 2-wire interface, meaning that the bus has 2 signal lines: clock and data. Every device on the bus connects to both signals. When a master wants to communicate with one of the devices on the bus, it sends a start bit followed by a control byte. You can see a typical EEPROM control byte now.
Is I2C faster than SPI?
I2C is used only two wire for the communication, one wire is used for the data and the second wire is used for the clock. I2C is slower than SPI. In comparison to I2C, SPI is faster. I2C draws more power than SPI.
Is I2C full duplex?
Full-duplex/Half-duplex The I2C protocol is inherently half-duplex, while the SPI protocol is inherently full-duplex. So with SPI, every read is also a write.
Should I use SPI or I2C?
Overall, SPI is better for high speed and low power applications, while I2C is better suited for communication with a large number of peripherals, as well as in situations involving dynamic changing of the primary device role among peripherals on the I2C bus.
Can a bit bang library be used for I2C?
On the ATtiny85, this is the only pin numbering supported so that the Wire library doesn’t get linked in (to save FLASH space). This latest version allows you to use this library for both bit-bang I2C or make use of the Wire library indirectly.
Why do I need to write an I2C protocol?
The I2C protocol doesn’t require any special functionality of the pins beyond standard GPIO features. The reason I wrote it was for getting easy access to I2C devices on various microcontrollers that don’t necessarily have exposed I2C interfaces. This has come in handy on a variety of projects including AVR, ESP32, and nRF5 micrcontrollers.
Why is there no line up in I2C?
No device ever holds a bus line up — it can only bring it down. This is because I2C uses an open-drain type of communication, meaning that instead of outputting a positive voltage for a logical 1 the device goes into a high-impedence (Hi-Z) state, effectively removing its pin from the bus.
Which is the default PIN number for I2C?
If using the hardware I2C (Wire library), the pin numbers can be set to 0xff to use the default I2C pins or to specific pins on systems which support multiple I2C buses. Frequencies above 400Khz are possible, but not necessarily accurate.