h. Copyright © Infineon Technologies AG 2020. All rights reserved. Page 6. Implementation. › The below figures from the AURIX™. TC29x B-Step User's Manual ...
ERU_Interrupt_1 for KIT_AURIX_TC297_TFT
External interrupt generation
AURIXTM TC2xx Microcontroller Training V1.0.1
Please read the Important Notice and Warnings at the end of this document
Scope of work
The ERU is used to generate an interrupt on each rising and falling edge at an input pin. The code example uses the External Request Unit (ERU) to generate an interrupt for each falling and rising edge at the input pin P02.0. The falling and rising edges are generated with pin P02.1. If an interrupt occurs, an LED will be toggled.
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Introduction
> The External Request Unit (ERU) is a versatile event and pattern detection unit.
> Its main task is the generation of interrupts based on selectable trigger events at different inputs, e.g. to generate external interrupt requests if an edge occurs at an input pin.
> The detected events can also be used by other modules to trigger or to gate module specific actions.
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Hardware setup
This code example has been developed for the board KIT_AURIX_TC297_TFT_BC-Step.
The two pins P02.0 and P02.1 have to be connected to each other.
Input
Output
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Implementation
> To generate an interrupt via a falling and rising edges on an input pin, a few configuration steps are required: Initialize external request pin (IfxScuEru_initReqPin()) Select which edge should trigger the interrupt (IfxScuEru_enableRisingEdgeDetection() and/or IfxScuEru_enableFallingEdgeDetection()) Enable generation of trigger events with the function IfxScuEru_enableTriggerPulse() Choose the output channel by selecting the Output Gating Unit (OGUz) and the trigger pulse output (TRxz) An event from the Event Trigger Logic (ETL0) triggers the OGU0 (signal TRx0). The function IfxScuEru_connectTrigger() determines the output channel for the trigger event Select the condition to generate an interrupt with the function IfxScuEru_setInterruptGatingPattern() Configure and enable the service request with the functions IfxSrc_init() and IfxSrc_enable()
> The functions above are provided by the iLLD headers IfxScuEru.h and IfxSrc.h.
Copyright © Infineon Technologies AG 2020. All rights reserved.
Implementation
> The below figures from the AURIXTM TC29x B-Step User's Manual illustrate the configuration steps that were followed in this example.
Copyright © Infineon Technologies AG 2020. All rights reserved.
Implementation
The Interrupt Service Routine (ISR) Blinking an LED is implemented inside an ISR triggered by the ERU which generates interrupt requests according to its configuration. The method implementing the ISR needs to be assigned a priority and a CPU core responsible for its execution. This is done with the macro IFX_INTERRUPT(isr, vectabNum, priority). When triggered, the ISR blinks the LED by toggling the state of the connected pin using the function IfxPort_setPinState().
Copyright © Infineon Technologies AG 2020. All rights reserved.
Run and Test
After code compilation and flashing the
device, perform the following steps:
1. Connect the two pins P02.0 and
P02.1 to each other.
P02.1 is used to generate the
falling and rising edges by
toggling the state from high to
low. P02.0 is the input of the
ERU which generates the
interrupts on falling and rising
edges.
2. Toggle the P02.1 pin state via
the value of the variable
LEDstate of the structure
1
g_ERUconfig with the
debugger.
3. Check LED D107 (1) is
changing state when the
variable is modified.
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References
> AURIXTM Development Studio is available online: > https://www.infineon.com/aurixdevelopmentstudio > Use the ,,Import..." function to get access to more code examples.
> More code examples can be found on the GIT repository: > https://github.com/Infineon/AURIX_code_examples
> For additional trainings, visit our webpage: > https://www.infineon.com/aurix-expert-training
> For questions and support, use the AURIXTM Forum: > https://www.infineonforums.com/forums/13-Aurix-Forum
Copyright © Infineon Technologies AG 2020. All rights reserved.
Revision history
Revision V1.0.1 V1.0.0
Description of change Update of version to be in line with the code example's version Initial version
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Edition 2020-12 Published by Infineon Technologies AG 81726 Munich, Germany
© 2020 Infineon Technologies AG. All Rights Reserved.
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Document reference ERU_Interrupt_1_KIT_TC297_TFT
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