Infineon GPT12 Timer Concatenation 1 Bedienungsanleitung
Scope of work
A 32-bit timer is formed by the concatenation of two timers of the
GPT12 module. On timer overflow an interrupt is generated, which
toggles an LED.
A 32-bit timer is formed by the concatenation of two 16-bit timers of the
GPT12 module. When the 32-bit timer overflows, an interrupt is generated
toggling an LED.
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Introduction
›The General Purpose Timer Unit GPT12 is divided into two GPT blocks
(GPT1 and GPT2).
›The GPT12 unit incorporates five 16-bit timers which may operate
independently in several different modes.
›Block GPT2 contains two timers/counter: the core timer T6 and one auxiliary
timer T5.
›Both timers of block GPT2 can run in Timer Mode, Gated Timer Mode or
Counter Mode.
›An additional Capture/Reload register (CAPREL) supports also capture and
reload operation.
›The timer T5 in Counter Mode and the timer T6 in Timer Mode are used
together in this example.
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Hardware setup
This code example has been
developed for the board
KIT_AURIX_TC297_TFT_BC-Step.
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Implementation
Configuration of the GPT12 module
The function init_GPT12_module() is used to configure the two timers T5 and T6 of
GPT2 for concatenated 32-bit operation. It contains the following steps:
›The GPT12 module is enabled by calling the function IfxGpt12_enableModule().
›GPT2 prescaler is set to IfxGpt12_Gpt2BlockPrescaler_2 to get the highest possible
frequency by calling IfxGpt12_setGpt2BlockPrescaler().
›The functions IfxGpt12_T6_setMode() and IfxGpt12_T5_setMode() are used to
configure the modes of both timers. The core timer T6 is set to IfxGpt12_Mode_timer
and the auxiliary timer T5 is set to IfxGpt12_Mode_counter.
›Both the rising and falling edge of the Output Toggle Latch of timer T6 are selected as
active transition with the function IfxGpt12_T5_setCounterInputMode().
›The function IfxGpt12_T5_setRemoteControl() configures the timer T5 to be
activated by the run bit of core timer T6. IfxGpt12_T6_run() function starts timer T6
and implicitly timer T5, because the overflow of T6 is used as clock for T5.
The functions above are provided by the iLLD header IfxGpt12.h.
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Implementation
Configuring the interrupt service routing for block GPT2
›The function IfxGpt12_T5_getSrc() returns the pointer to the service request control
(SRC) register of timer T5.
›The function IfxGpt12_T6_getSrc() returns the pointer to the SRC register of timer T6.
›The above mentioned pointers to the SRC registers are used to initialize and enable
the ISRs by setting the service provider and the priority number. This is done via the
functions IfxSrc_init() and IfxSrc_enable() provided by the iLLD header IfxSrc.h.
›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).
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Implementation
The Interrupt Service Routines (ISRs)
›The incrementation of the counter values is different for both timers:
–The counter of timer T6 (Timer Mode) is incremented with the frequency of timer T6.
–The counter of timer T5 (Counter Mode) is incremented by each overflow of timer
T6.
›The overflow of each timer triggers an interrupt.
›Each timer has associated its own Interrupt Service Routine.
›The ISR of timer T6 is triggered after the overflow of the 16-bit timer value of timer T6.
›Due to the timer concatenation, the ISR of timer T5 is triggered with the overflow of the
32-bit timer value. This ISR toggles an LED.
›The 32-bit timer value is calculated in the ISR of T6 and is represented by
timerValueHIGH (T5) and timerValueLOW (T6).
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2019-10-17 Copyright © Infineon Technologies AG 2019. All rights reserved.
Run and Test
After code compilation and flashing the
device, perform the following steps:
›Check if LED D107 (1) is toggling its
state every 86 seconds:
–Maximum value of 32-bit timer is
4294967295
–Frequency of GPT12 module is 100
MHz
–Prescaler of GPT2 block is set to 2
–Timer T6 frequency is 100 MHz / 2
= 50 MHz, which means the value
of the 32-bit timer will be
incremented each 20 ns (1 / 50
MHz)
–Overflow of 32-bit timer after ≈ 86 s
(4294967295 * 20 ns)
›Check in the debugger if parameter
g_timerValue32Bit is incrementing
1
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References
›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
›AURIX™ Development Studio is available online:
›https://www.infineon.com/aurixdevelopmentstudio
›Use the „Import...“ function to get access to more code examples.
›For questions and support, use the AURIX™ Forum:
›https://www.infineonforums.com/forums/13-Aurix-Forum
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2019-10-17 Copyright © Infineon Technologies AG 2019. All rights reserved.
IMPORTANT NOTICE
The information given in this document shall in no
event be regarded as a guarantee of conditions or
characteristics (“Beschaffenheitsgarantie”).
With respect to any examples, hints or any typical
values stated herein and/or any information
regarding the application of the product, Infineon
Technologies hereby disclaims any and all
warranties and liabilities of any kind, including
without limitation warranties of non-infringement
of intellectual property rights of any third party.
In addition, any information given in this
document is subject to customer’s compliance
with its obligations stated in this document and
any applicable legal requirements, norms and
standards concerning customer’s products and
any use of the product of Infineon Technologies in
customer’s applications.
The data contained in this document is exclusively
intended for technically trained staff. It is the
responsibility of customer’s technical
departments to evaluate the suitability of the
product for the intended application and the
completeness of the product information given in
this document with respect to such application.
For further information on the product,
technology, delivery terms and conditions and
prices please contact your nearest Infineon
Technologies office (www.infineon.com).
WARNINGS
Due to technical requirements products may
contain dangerous substances. For information
on the types in question please contact your
nearest Infineon Technologies office.
Except as otherwise explicitly approved by
Infineon Technologies in a written document
signed by authorized representatives of Infineon
Technologies, Infineon Technologies’ products
may not be used in any applications where a
failure of the product or any consequences of the
use thereof can reasonably be expected to result
in personal injury.
Edition 2019-10
Published by
Infineon Technologies AG
81726 Munich, Germany
© 2019 Infineon Technologies AG.
All Rights Reserved.
Do you have a question about this
document?
Email: erratum@infineon.com
Document reference
GPT12_Timer_Concatenation_1
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