Infineon CCU6 PWM Capture 1 Manual de usuario
Scope of work
The CCU6 unit is used to capture an external PWM signal and calculate
its frequency and duty cycle.
A simple PWM signal is generated by toggling a port pin. The resulting PWM
frequency and duty cycle is measured by the Capture/Control Unit 6 (CCU6).
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2020-01-17 Copyright © Infineon Technologies AG 2020. All rights reserved.
Introduction
›The Capture/Compare Unit 6 (CCU6) is a high resolution 16 bit capture
and compare unit specially designed for motor control purposes.
›The CCU6 unit is made up of a timer T12 Block with three
capture/compare channels and a timer T13 Block with one compare
channel.
›Among other features, the CCU6 has the capability to capture external
input signals. In this example, the Input Capture Unit and the timer T12 of
the CCU6 module are used to capture a PWM signal and calculate its
frequency and duty cycle.
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2020-01-17 Copyright © Infineon Technologies AG 2020. All rights reserved.
Hardware setup
This code example has been developed
for the board
KIT_AURIX_TC297_TFT_BC-Step.
Connect the two pins
P02.1 (PWM signal) and P02.0
(CC60 input) to each other.
PWM signalinput pin A
of CC60
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2020-01-17 Copyright © Infineon Technologies AG 2020. All rights reserved.
Implementation
Configuring the CCU6 Input Capture Unit
To properly configure the CCU6 module for capturing a PWM signal, the module itself
and one of its channels need to be configured.
For the configuration of the module, the following steps are required:
›An instance of the structure IfxCcu6_Icu_Config needs to be created and default
values are assigned to the configuration with the function
IfxCcu6_Icu_initModuleConfig()
›For capturing a PWM signal, no changes to the default configuration are required,
therefore the module can be initialized with the default configuration by calling the
function IfxCcu6_Icu_initModule()
›After the successful initialization of the CCU6 module, its handle structure
(IfxCcu6_Icu) contains the configured capture frequency of the timer. For further
usage, this parameter is stored in the global variable
g_CCU6captureFrequency_Hz.
All used functions and structures can be found in the iLLD header IfxCcu6_Icu.h.
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2020-01-17 Copyright © Infineon Technologies AG 2020. All rights reserved.
Implementation
Configuring the CCU6 Input Capture Unit
For the configuration of the channel, an instance of the structure IfxCcu6_Icu_ChannelConfig
is created and default values are assigned to the configuration with the function
IfxCcu6_Icu_initChannelConfig(). Then, the following changes to the default configuration are
required:
›channelld –Select the channel of timer T12. In this example, channel 0 is selected
›channelMode –Select the operating mode for the channel. In this example, the rising and
falling edges of an external signal are captured using the double register capture mode
›Interrupt1 structure –Configure an interrupt by selecting the source, the service request
output, its priority and the service provider. In this example, the CCU6 service request 0 is
configured to trigger an interrupt on every rising edge at the input pin of capture/compare
channel 0 (CC60). To calculate the duty cycle, a shadow register filled when a falling edge
occurs, is used. Therefore, no interrupt is required for the falling edge.
›Interrupt2 structure –Configure another interrupt similar with the previous, where the CCU6
service request 1 is configured to trigger an interrupt on every period match (match of the
timer T12 counter value with the period value)
Note: An interrupt is needed to capture the PWM frequency, while the other counts the number
of timer overflows (for more details, see slides 8-12).
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2020-01-17 Copyright © Infineon Technologies AG 2020. All rights reserved.
Implementation
Configuring the CCU6 Input Capture Unit
›trigger.extInputTrigger - Select the internal start controlled by the run bit T12R
by setting a null pointer (NULL_PTR) to this field
›pins –A structure to set the used port pins for the CCU6 configuration. Only
CC60In with input mode IfxPort_InputMode_pullUp is selected
›multiInputCaptureEnabled –Disable the multiple input capture mode
After the initialization of the channel with the user configuration (which is applied by
calling the function IfxCcu6_Icu_initChannel()), the capture process is started by
setting the run bit T12R through the function IfxCcu6_Icu_startCapture().
All functions and structures used for the configuration of the CCU6 channel can be
found in the iLLD header IfxCcu6_Icu.h.
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2020-01-17 Copyright © Infineon Technologies AG 2020. All rights reserved.
Implementation
The Interrupt Service Routines (ISR)
For capturing of PWM signals with the CCU6 module, two ISRs are required:
›CCU6_ICU_Period_Match_Int_Handler() - Interrupt on every period
match, used for counting the timer overflows
›CCU6_ICU_Rising_Edge_Int_Handler() - Interrupt on every rising edge
at the input pin of capture/compare channel 0, used to calculate
–the time between two rising edges and the PWM frequency
–the time between a rising edge and the falling edge and the PWM duty
cycle
The method implementing each 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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2020-01-17 Copyright © Infineon Technologies AG 2020. All rights reserved.
Implementation
The Interrupt Service Routines (ISR)
›When the rising edge is detected at the input pin of capture/compare channel 0 (CC60), the
interrupt handler (CCU6_ICU_Rising_Edge_Int_Handler()) is triggered
›The interrupt status flags of the CC60 interrupt have to be cleared inside the ISR
›The PWM frequency is calculated by dividing the CCU6 capture frequency
(g_CCU6captureFrequency_Hz) by the total amount of increments of the timer T12 (the
time between two rising edges)
›The PWM duty cycle is calculated as a percentage value between the amount of increments
of the timer T12 between the rising and falling edge (high level time) and the total amount of
increments between two rising edges (period).
›An overflow of timer T12 triggers the second interrupt
(CCU6_ICU_Period_Match_Int_Handler()) which is used for counting:
–the overflows between two rising edges for PWM frequency calculation
–the overflows between the rising edge and the falling edge for PWM duty cycle calculation
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2020-01-17 Copyright © Infineon Technologies AG 2020. All rights reserved.
Implementation
Calculation example of the PWM frequency
Background knowledge:
›Maximum value of timer T12 is 65534 (16 bit –1; default configuration, configured inside
function IfxCcu6_Icu_initModuleConfig())
›Frequency of timer T12 is 781250 Hz (stored inside variable
g_CCU6captureFrequency_Hz; default configuration), which means that the value of timer
T12 is incremented every 1.28 µs (1 / 781250 Hz)
›Overflow of timer T12 occurs after ≈ 0.084 s(65534 * 1.28 µs)
›The total amount of increments can be calculated by comparing the current value of timer
T12 with the value of timer T12 one PWM period ago e.g. 1000
Interrupt on each rising edge:
T12 count
(value is incremented
with frequency of timer T12)
PWM signal
t
t
Period of
timer T12 overflow
Period of
PWM signal High level
time
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2020-01-17 Copyright © Infineon Technologies AG 2020. All rights reserved.
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