Infineon GTM TIM Capture 1 Manual de usuario

AURIX™ TC2xx Microcontroller Training

V1.0.0

GTM_TIM_Capture_1

PWM input capturing via TIM

Please read the Important Notice and Warnings at the end of this document

Scope of work

The Timer Input Module (TIM) of the GTM is used to capture an external

PWM signal and calculate the PWM signal frequency and duty cycle.

The TIM is used in capture mode. The data from the captured PWM signal is

used to calculate the PWM signal frequency and duty cycle in software. The

frequency and the duty cycle are then stored in variables.

Introduction

›The Generic Timer Module (GTM) is a modular timer unit designed to

accommodate many timer applications.

›The Timer Input Module (TIM) is responsible for filtering and capturing

input signals of the GTM.

›The Clock Management Unit (CMU) is responsible for clock generation of

the GTM. The Configurable Clock Generation Subunit (CFGU) provides

eight clock sources for the GTM submodules: TIM, TBU, MON and ATOM.

GTM TIM GTM TOM

Introduction

›The GTM has an in-built Timer Output Module (TOM) that can offer 16

independent channels to generate output signals.

›The Clock Management Unit (CMU) is responsible for clock generation of

the GTM. The Fixed Clock Generation (FXU) is one of its subunits and it

provides five predefined non-configurable clocks for GTM modules,

including the TOM.

GTM TOM

GTM TIM

Hardware setup

This code example has been

developed for the board

KIT_AURIX_TC297_TFT_BC-Step.

Connect the TIM input port pin

P02.0 with the TOM output port pin

P02.3.

Implementation

Configuring the TIM

The configuration of the TIM is done by calling the initialization function init_TIM_module(),

containing the following steps:

›Enable the GTM by calling the function IfxGtm_enable()

›Enable the CMU clock 0 by calling the function IfxGtm_Cmu_enableClocks()

›Initialize an instance of the IfxGtm_Tim_In_Config structure with the default parameters by

calling the iLLD function IfxGtm_Tim_In_initConfig()

›The IfxGtm_Tim_In_Config structure allows the setting of multiple parameters in order to

initialize the module, including the following:

–filter.inputPin –Selection of the input port pin of the TIM (port pin P02.0 in this example)

–filter.inputPinMode –Selection of the input mode for the input port pin of the TIM

(IfxPort_InputMode_pulldown in this example)

›After setting the configuration parameters, the function IfxGtm_Tim_In_init() applies the

user configuration to the module

All the functions used for the configuration of the TIM are provided by the iLLD header

IfxGtm_Tim_In.h.

Implementation

Configuring the TOM

The configuration of the TOM is done by calling the function generate_PWM() containing the

following steps:

›Enable the FXU clocks by calling the function IfxGtm_Cmu_enableClocks().

›Initialize an instance of the structure IfxGtm_Tom_Pwm_Config with its default values by

calling the function IfxGtm_Tom_Pwm_initConfig() .

›The IfxGtm_Tom_Pwm_Config structure allows to set the following parameters to initialize

the module:

–tom –Selection of the TOM which is counting

–tomChannel –Selection of the channel which is driving the output port pin

–period –Setting of the period for the PWM signal to the desired value

–dutyCycle –Setting of the duty cycle of the PWM signal to the desired value

–pin.outputPin –Selection of the output port pin

–synchronousUpdateEnable –Enabling of Synchronous Update of the timer

–clock –Selection of the clock used for the generation of the PWM

Implementation

Configuring the TOM

›After setting the configuration parameters, the function IfxGtm_Tom_Pwm_init() applies the

user configuration to the module

›Start the PWM with the function IfxGtm_Tom_Pwm_start()

All the functions used for the configuration of the TOM are provided by the iLLD header

IfxGtm_Tom_Pwm.h.

Implementation

PWM generation example

The FXU clock 1 frequency (ffxclk1) is 6.250 MHz in this example. The period value to have the

desired PWM frequency (fPWM) is calculated with the following formula:

  







In this example:    

       

PWM signal

Period of PWM

FXU clock 1

Frequency of the

clock

Duty cycle of the PWM

Implementation

Measuring PWM frequency and duty cycle

The measurement of the PWM frequency and duty cycle is done by calling the

function measure_PWM() containing the following steps:

›Update the measured PWM data by calling the iLLD function

IfxGtm_Tim_In_update()

›Get the PWM period in seconds with the iLLD function

IfxGtm_Tim_In_getPeriodSecond()

›Calculate the PWM frequency with the formula: frequency(Hz) = 1 / period(s)

›Get the PWM duty cycle by calling the iLLD function

IfxGtm_Tim_In_getDutyPercent()

All the iLLD functions above are provided by the iLLD header IfxGtm_Tim_In.h

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