I am trying to connect STM32 (slave) and raspberry pi (master) via I2C. I need Codesys running on raspberry pi to be able to read data from I2C using an interrupt.
Is it possible? Is there any example? I would appreciate any help.
I currently use the I2C_master.read library to read data in Codesys.
Thanks
Pavel
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1
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You're talking about pulling one of the GPIO pins high/low to trigger an interrupt and read something over the i2c bus? I don't believe that interrupts triggered from the GPIO are supported.
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Do you perform a cyclic I2C already and it is not enough?
Or do you only want to read I2C only when there is a change (interrupt) in the slave?
If its the latter then you can use a GPIO as input to trigger a I2C read as Morberis said.
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1
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I was assuming it was a hardware interrupt that was wanted though if that's not required it could definately trigger a read through a variety of methods.
My reference for hardware interrupts not being supported is this post here.
If you would like to refer to this comment somewhere else in this project, copy and paste the following link:
Hello,
I am trying to connect STM32 (slave) and raspberry pi (master) via I2C. I need Codesys running on raspberry pi to be able to read data from I2C using an interrupt.
Is it possible? Is there any example? I would appreciate any help.
I currently use the I2C_master.read library to read data in Codesys.
Thanks
Pavel
You're talking about pulling one of the GPIO pins high/low to trigger an interrupt and read something over the i2c bus? I don't believe that interrupts triggered from the GPIO are supported.
more posts ...
Do you perform a cyclic I2C already and it is not enough?
Or do you only want to read I2C only when there is a change (interrupt) in the slave?
If its the latter then you can use a GPIO as input to trigger a I2C read as Morberis said.
Sorry yes that could work.
I was assuming it was a hardware interrupt that was wanted though if that's not required it could definately trigger a read through a variety of methods.
My reference for hardware interrupts not being supported is this post here.