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Can GPIO pins be used for I2C?
I2C can be implemented using two GPIO pins of the Intel® IXP42X Product Line of Network Processors and IXC1100 Control Plane Processor, including the I2C standard communication protocol, hardware interface implementation, and I2C software written for the Intel® IXP42X product line and IXC1100 control plane processors …
Can GPIO be used for SPI?
It is fine to use a GPIO pin for SPI Chip Select (CS) signal but user has to manually set/clear and take care while communicating with SPI device. Normally using CS pin of SPI module itself is beneficial because there is no additional software overhead needed.
Can SPI and I2C be implemented using GPIO pins?
Can SPI and I2C be implemented using digital GPIO pins? I.e. can the SDA and SCK pins of I2C and the MISO, MOSI, SCK, and SS pins of SPI be emulated by setting GPIO pins as input and output accordingly? For example in the case of an Arduino/Atmega328p, certain pins have been dedicated for SPI and I2C use.
Can a bit bang slave be implemented using GPIO pins?
To bit-bang a slave means that the software must be ready on time to the incoming clock. To fully implement I2C, the master also needs to monitor the SCL line for variable amounts of time to allow the slave to acknowledge transactions. Yes, it is no problem.
Can a SCK emulation use a GPIO pin?
1 For the SCK emulation, assume that somehow you are able to pass the clock pulse to a GPIO pin set in output mode. Note: The Arduino is just an example. I am asking in a general sense. Sometimes you can bit-bang these interfaces but it will take more resources and may not work on all cases.
Why are GPIO pins used in the MCU?
The specified pins are connected to dedicated hardware inside which makes it easier to use and it generally will work better, faster and will use less resources. For example, you can be off doing something else whilst the bus is sending or receiving data. Read the MCU datasheet to see which pins are used and if there are an alternates available.