After a new call to configure(), the begin() function does not update the submodule registers.

Hi, so I'm using the eFlexPwm library, and for now I can't find a way to synchronize two different modules. Is the library capable of doing that? Or only submodules?

So, I have this code, and when I check with an oscilloscope the signals from FlexPWM2 there's almost no deviation (100ns). But when I compare outputs from PWM2 and PWM 4 there's a delay of 3.0 us. Is there any way to synchronize the timers? So they start at the same time?

/*
eFlexPwm Simple Example

This example generates 3 pairs of PWM signals on a Teensy 4.1 board
Each signal pair corresponds to the PWMA output and the PWMB (A's complement)
output of an eFlexPWM submodule.
In this example, sub-modules 0, 2 and 3 of PWM2 are used. On the Teensy 4.1 board,
this corresponds to the following pins:

This example displays a message on the Serial link (USB CDC), and any error messages:

eFlexPwm Simple Example
Submodules successfuly started
*/
#include <Arduino.h>
#include <eFlexPwm.h>
//#include "TeensyTimerTool.h"

// Definitions
// ----------------------------------------------------------------------------
// avoid systematically prefixing objects with the namespace
using namespace eFlex;
//using namespace TeensyTimerTool;

// Variables
// ----------------------------------------------------------------------------
/* PWM frequence in hz. */
const uint32_t PwmFreq = 15000;
const uint32_t sinefreq = 50;

// My eFlexPWM submodules (Hardware > PWM2: SM[0], SM[2], SM[3])
SubModule Sm20(4,33);
SubModule Sm22(6,9);

SubModule Sm40(22);
SubModule Sm41(23);
SubModule Sm42(2,3);

// Initialize Timers for PWM2 and PWM4
Timer &Tm2 = Sm20.timer();
Timer &Tm4 = Sm40.timer();

// Duty Cycle in %
uint8_t dutyCyclePercent = 0;

// Code
void setup_FlexPWM2() {

Config myConfig;

myConfig.setReloadLogic(kPWM_ReloadPwmFullCycle); // Use full cycle reload
myConfig.setPwmFreqHz(PwmFreq); // Set PWM Frequency for PWM2.

// Initialize SubModule 0
Sm20.configure(myConfig);

// Initialize SubModule 2
myConfig.setClockSource(kPWM_Submodule0Clock); //Same clock as SubModule 0
myConfig.setPrescale(kPWM_Prescale_Divide_1);
myConfig.setInitializationControl(kPWM_Initialize_MasterSync);

Sm22.configure (myConfig);
}

void setup_FlexPWM4() {

Config myConfig;

myConfig.setReloadLogic(kPWM_ReloadPwmFullCycle); // Use full cycle reload
myConfig.setPwmFreqHz(PwmFreq); // Set PWM Frequency for PWM2.

// Initialize SubModule 0
Sm40.configure(myConfig);

// Initialize SubModule 1
myConfig.setClockSource(kPWM_Submodule0Clock); //Same clock as SubModule 0
myConfig.setPrescale(kPWM_Prescale_Divide_1);
myConfig.setInitializationControl(kPWM_Initialize_MasterSync);

Sm41.configure(myConfig);
Sm42.configure(myConfig);
}

void setup(){

setup_FlexPWM2();
setup_FlexPWM4();

Tm2.begin();
Tm4.begin();
}

void loop() {

int dutyCyclePercent_A = 50;
int dutyCyclePercent_B = 50;

Sm20.updateDutyCyclePercent (dutyCyclePercent_A, ChanA);
Sm20.updateDutyCyclePercent (dutyCyclePercent_B, ChanB);
Sm22.updateDutyCyclePercent (dutyCyclePercent_A, ChanA);
Sm22.updateDutyCyclePercent (dutyCyclePercent_B, ChanB);
Sm40.updateDutyCyclePercent (dutyCyclePercent_A); //Only has one channel
Sm41.updateDutyCyclePercent (dutyCyclePercent_B); //Only has one channel
Sm42.updateDutyCyclePercent (dutyCyclePercent_A, ChanA);
Sm42.updateDutyCyclePercent (dutyCyclePercent_B, ChanB);;

Tm2.setPwmLdok();
Tm4.setPwmLdok();
}

PACKAGES:

• framework-arduinoteensy @ 1.158.0 (1.58)
• tool-teensy @ 1.158.0 (1.58)
• toolchain-gccarmnoneeabi-teensy @ 1.110301.0 (11.3.1)

.pio\libdeps\teensy41\eFlexPwm\src\source\eFlexPwmSubmodule.cpp: In constructor 'eFlex::SubModule::SubModule(int, int)':
.pio\libdeps\teensy41\eFlexPwm\src\source\eFlexPwmSubmodule.cpp:15:5: warning: list-initializer for non-class type must not be parenthesized
   15 |     m_pin ({Pin (pinA), Pin (pinB) }), m_tmidx (-1), m_smidx (-1), m_ptr (0), m_wasbegin (false) {

SubModule Sm21 (5);
....
assert(Sm21.isValid());

Fail!