CODEWITHSUNDEEP
embeddedspigpiostm32f4discoverycoocox
Pavan Koneru
Pavan Koneru

Reputation: 21

Is it possible to do SPI operation using GPIO Pins?

I want to to execute the SPI protocol operation using GPIO Pins, want to configure to single slave operation, in which way I have to configure that, I am using STM32F100RB Microcontroller and Coocox IDE for this executing in windowsxp.

if any body have example source code regarding the configuration of SPI Protocol operation using GPIO pins, then please send me that. it very helpful for my project, Thanks in advance.

Regards, Pavan Neo.

Upvotes: 1

Views: 5744

Answers (1)

rjp
rjp

Reputation: 1820

You're asking about Bit banging. This is the process of using an IO (or several) to encode or decode a serial signal. Wikipedia has a good description of this process.

For SPI specifically, you will need two or three outputs (depending on whether or not chip select is needed) and one input. You'll have to ensure that your bits are set or read in the correct order to not violate any setup/hold requirements of your peripheral, and you'll need to pay attention to the polarity needed on the clock signal (to make sure you're reading/writing data on the correct edge).

The Wikipedia link has some example code for bit banging that you may find useful as a starting point.

Upvotes: 5

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