- Important Change from v1.2.0
- Why do we need this nRF52_MBED_Slow_PWM library
- Changelog
- Prerequisites
- Installation
- HOWTO Fix
Multiple Definitions
Linker Error - Usage
- Examples
- Example ISR_16_PWMs_Array_Complex
- Debug Terminal Output Samples
- Debug
- Troubleshooting
- Issues
- TO DO
- DONE
- Contributions and Thanks
- Contributing
- License
- Copyright
Please have a look at HOWTO Fix Multiple Definitions
Linker Error
As more complex calculation and check inside ISR are introduced from v1.2.0, there is possibly some crash depending on use-case.
You can modify to use larger HW_TIMER_INTERVAL_US
, (from current 10uS), according to your board and use-case if crash happens.
// Don't change these numbers to make higher Timer freq. System can hang
#define HW_TIMER_INTERVAL_US 10L
Why do we need this nRF52_MBED_Slow_PWM library
This library enables you to use ISR-based PWM channels on an nRF52-based board using Arduino-mbed mbed_nano core such as Nano-33-BLE to create and output PWM any GPIO pin. Because this library doesn't use the powerful hardware-controlled PWM with limitations, the maximum PWM frequency is currently limited at 1000Hz, which is still suitable for many real-life applications. Now you can also modify PWM settings on-the-fly.
This library enables you to use Interrupt from Hardware Timers on nRF52_MBED-based boards to create and output PWM to pins. It now supports 16 ISR-based synchronized PWM channels, while consuming only 1 Hardware Timer. PWM interval can be very long (uint32_t millisecs). The most important feature is they're ISR-based PWM channels. Therefore, their executions are not blocked by bad-behaving functions or tasks. This important feature is absolutely necessary for mission-critical tasks. These hardware PWM channels, using interrupt, still work even if other functions are blocking. Moreover, they are much more precise (certainly depending on clock frequency accuracy) than other software PWM using millis() or micros(). That's necessary if you need to measure some data requiring better accuracy.
As Hardware Timers are rare, and very precious assets of any board, this library now enables you to use up to 16 ISR-based synchronized PWM channels, while consuming only 1 Hardware Timer. Timers' interval is very long (ulong millisecs).
Now with these new 16 ISR-based PWM-channels, the maximum interval is practically unlimited (limited only by unsigned long milliseconds) while the accuracy is nearly perfect compared to software PWM channels.
The most important feature is they're ISR-based PWM channels. Therefore, their executions are not blocked by bad-behaving functions / tasks. This important feature is absolutely necessary for mission-critical tasks.
The ISR_16_PWMs_Array_Complex example will demonstrate the nearly perfect accuracy, compared to software PWM, by printing the actual period / duty-cycle in microsecs
of each of PWM-channels.
Being ISR-based PWM, their executions are not blocked by bad-behaving functions / tasks, such as connecting to WiFi, Internet or Blynk services. You can also have many (up to 16)
PWM channels to use.
This non-being-blocked important feature is absolutely necessary for mission-critical tasks.
You'll see software-based
SimpleTimer is blocked while system is connecting to WiFi / Internet / Blynk, as well as by blocking task
in loop(), using delay() function as an example. The elapsed time then is very unaccurate
Imagine you have a system with a mission-critical function, measuring water level and control the sump pump or doing something much more important. You normally use a software timer to poll, or even place the function in loop(). But what if another function is blocking the loop() or setup().
So your function might not be executed, and the result would be disastrous.
You'd prefer to have your function called, no matter what happening with other functions (busy loop, bug, etc.).
The correct choice is to use a Hardware Timer with Interrupt to call your function.
These hardware PWM channels, using interrupt, still work even if other functions are blocking. Moreover, they are much more precise (certainly depending on clock frequency accuracy) than other software PWM channels using millis() or micros(). That's necessary if you need to measure some data requiring better accuracy.
Functions using normal software PWM channels, relying on loop() and calling millis(), won't work if the loop() or setup() is blocked by certain operation. For example, certain function is blocking while it's connecting to WiFi or some services.
The catch is your function is now part of an ISR (Interrupt Service Routine), and must be lean / mean, and follow certain rules. More to read on:
- MBED nRF52840-based boards such as Nano_33_BLE, Nano_33_BLE_Sense, etc. using Arduino-mbed mbed_nano core
- Seeeduino nRF52840-based boards such as SEEED_XIAO_NRF52840 and SEEED_XIAO_NRF52840_SENSE, etc. using Seeeduino
mbed
core
-
Inside the attached function, delay() won’t work and the value returned by millis() will not increment. Serial data received while in the function may be lost. You should declare as volatile any variables that you modify within the attached function.
-
Typically global variables are used to pass data between an ISR and the main program. To make sure variables shared between an ISR and the main program are updated correctly, declare them as volatile.
-
Arduino mbed_nano core 3.4.1+
for NRF52-based board using mbed-RTOS such as Nano-33-BLE if you don't useNRF_TIMER_1
. -
Arduino mbed core v1.3.2-
for NRF52-based board using mbed-RTOS such as Nano-33-BLE if you'd like to useNRF_TIMER_1
. -
Seeeduino mbed core 2.7.2+
for Seeeduino nRF52840-based boards such as SEEED_XIAO_NRF52840 and SEEED_XIAO_NRF52840_SENSE -
To use with certain example
The best and easiest way is to use Arduino Library Manager
. Search for nRF52_MBED_Slow_PWM, then select / install the latest version.
You can also use this link for more detailed instructions.
Another way to install is to:
- Navigate to nRF52_MBED_Slow_PWM page.
- Download the latest release
nRF52_MBED_Slow_PWM-main.zip
. - Extract the zip file to
nRF52_MBED_Slow_PWM-main
directory - Copy whole
nRF52_MBED_Slow_PWM-main
folder to Arduino libraries' directory such as~/Arduino/libraries/
.
- Install VS Code
- Install PlatformIO
- Install nRF52_MBED_Slow_PWM library by using Library Manager. Search for nRF52_MBED_Slow_PWM in Platform.io Author's Libraries
- Use included platformio.ini file from examples to ensure that all dependent libraries will installed automatically. Please visit documentation for the other options and examples at Project Configuration File
The current library implementation, using xyz-Impl.h
instead of standard xyz.cpp
, possibly creates certain Multiple Definitions
Linker error in certain use cases.
You can include this .hpp
file
// Can be included as many times as necessary, without `Multiple Definitions` Linker Error
#include "nRF52_MBED_Slow_PWM.hpp" //https://github.com/khoih-prog/nRF52_MBED_Slow_PWM
in many files. But be sure to use the following .h
file in just 1 .h
, .cpp
or .ino
file, which must not be included in any other file, to avoid Multiple Definitions
Linker Error
// To be included only in main(), .ino with setup() to avoid `Multiple Definitions` Linker Error
#include "nRF52_MBED_Slow_PWM.h" //https://github.com/khoih-prog/nRF52_MBED_Slow_PWM
Check the new multiFileProject example for a HOWTO
demo.
Have a look at the discussion in Different behaviour using the src_cpp or src_h lib #80
For Arduino mbed_nano core 2.5.2+
, you can only select NRF52 Hardware Timer NRF_TIMER_3-NRF_TIMER_4 (3 to 4). If you select the already-used NRF_TIMER_0-2, it'll be auto modified to use NRF_TIMER_3
For Arduino mbed core v1.3.2-
, you can only select NRF52 Hardware Timer NRF_TIMER_1, NRF_TIMER_3-NRF_TIMER_4 (1, 3 and 4). But for the sake of compatibility, if you select the NRF_TIMER_0-2, it'll be auto modified to use NRF_TIMER_3
Before using any Timer, you have to make sure the Timer has not been used by any other purpose.
// Init NRF52 timer NRF_TIMER3
NRF52_MBED_Timer ITimer(NRF_TIMER_3);
// Init nRF52_Slow_PWM, each can service 16 different ISR-based PWM channels
NRF52_MBED_Slow_PWM ISR_PWM;
void irqCallbackStartFunc()
{
}
void irqCallbackStopFunc()
{
}
void setup()
{
....
// You can use this with PWM_Freq in Hz
ISR_PWM.setPWM(PWM_Pin, PWM_Freq, PWM_DutyCycle, irqCallbackStartFunc, irqCallbackStopFunc);
....
}
- ISR_16_PWMs_Array
- ISR_16_PWMs_Array_Complex
- ISR_16_PWMs_Array_Simple
- ISR_Changing_PWM
- ISR_Modify_PWM
- multiFileProject New
Example ISR_16_PWMs_Array_Complex
The following is the sample terminal output when running example ISR_16_PWMs_Array_Complex to demonstrate how to use multiple PWM channels with complex callback functions, the accuracy of ISR Hardware PWM-channels, especially when system is very busy. The ISR PWM-channels is running exactly according to corresponding programmed periods and duty-cycles
Starting ISR_16_PWMs_Array_Complex on Nano 33 BLE
NRF52_MBED_Slow_PWM v1.2.2
[PWM] Timer = NRF_TIMER3 , Timer Clock (Hz) = 16000000.00
[PWM] Frequency = 100000.00 , _count = 160
Starting ITimer OK, micros() = 2800208
Channel : 0 Period : 1000000 OnTime : 50000 Start_Time : 2802391
Channel : 1 Period : 500000 OnTime : 50000 Start_Time : 2805669
Channel : 2 Period : 333333 OnTime : 66666 Start_Time : 2809019
Channel : 3 Period : 250000 OnTime : 75000 Start_Time : 2812245
Channel : 4 Period : 200000 OnTime : 80000 Start_Time : 2815525
Channel : 5 Period : 166666 OnTime : 74999 Start_Time : 2818972
Channel : 6 Period : 142857 OnTime : 71428 Start_Time : 2822317
Channel : 7 Period : 125000 OnTime : 68750 Start_Time : 2825720
Channel : 8 Period : 111111 OnTime : 66666 Start_Time : 2829165
Channel : 9 Period : 100000 OnTime : 65000 Start_Time : 2832514
Channel : 10 Period : 66666 OnTime : 46666 Start_Time : 2835951
Channel : 11 Period : 50000 OnTime : 37500 Start_Time : 2839484
Channel : 12 Period : 40000 OnTime : 32000 Start_Time : 2843002
Channel : 13 Period : 33333 OnTime : 28333 Start_Time : 2846504
Channel : 14 Period : 25000 OnTime : 22500 Start_Time : 2850118
Channel : 15 Period : 20000 OnTime : 19000 Start_Time : 2853663
SimpleTimer (ms): 2000, us : 12855209, Dus : 10053055
PWM Channel : 0, programmed Period (us): 1000000.00, actual : 1000016, programmed DutyCycle : 5.00, actual : 5.00
PWM Channel : 1, programmed Period (us): 500000.00, actual : 500034, programmed DutyCycle : 10.00, actual : 10.00
PWM Channel : 2, programmed Period (us): 333333.34, actual : 333344, programmed DutyCycle : 20.00, actual : 20.00
PWM Channel : 3, programmed Period (us): 250000.00, actual : 250023, programmed DutyCycle : 30.00, actual : 29.99
PWM Channel : 4, programmed Period (us): 200000.00, actual : 200012, programmed DutyCycle : 40.00, actual : 40.00
PWM Channel : 5, programmed Period (us): 166666.67, actual : 166689, programmed DutyCycle : 45.00, actual : 44.98
PWM Channel : 6, programmed Period (us): 142857.14, actual : 142882, programmed DutyCycle : 50.00, actual : 49.98
PWM Channel : 7, programmed Period (us): 125000.00, actual : 125016, programmed DutyCycle : 55.00, actual : 54.97
PWM Channel : 8, programmed Period (us): 111111.11, actual : 111133, programmed DutyCycle : 60.00, actual : 59.97
PWM Channel : 9, programmed Period (us): 100000.00, actual : 100009, programmed DutyCycle : 65.00, actual : 64.99
PWM Channel : 10, programmed Period (us): 66666.66, actual : 66672, programmed DutyCycle : 70.00, actual : 69.95
PWM Channel : 11, programmed Period (us): 50000.00, actual : 50031, programmed DutyCycle : 75.00, actual : 74.91
PWM Channel : 12, programmed Period (us): 40000.00, actual : 40005, programmed DutyCycle : 80.00, actual : 79.97
PWM Channel : 13, programmed Period (us): 33333.33, actual : 33377, programmed DutyCycle : 85.00, actual : 84.88
PWM Channel : 14, programmed Period (us): 25000.00, actual : 25001, programmed DutyCycle : 90.00, actual : 89.88
PWM Channel : 15, programmed Period (us): 20000.00, actual : 20003, programmed DutyCycle : 95.00, actual : 94.93
SimpleTimer (ms): 2000, us : 22957454, Dus : 10102245
PWM Channel : 0, programmed Period (us): 1000000.00, actual : 1000011, programmed DutyCycle : 5.00, actual : 5.00
PWM Channel : 1, programmed Period (us): 500000.00, actual : 500024, programmed DutyCycle : 10.00, actual : 9.99
PWM Channel : 2, programmed Period (us): 333333.34, actual : 333349, programmed DutyCycle : 20.00, actual : 19.99
PWM Channel : 3, programmed Period (us): 250000.00, actual : 250015, programmed DutyCycle : 30.00, actual : 29.99
PWM Channel : 4, programmed Period (us): 200000.00, actual : 200028, programmed DutyCycle : 40.00, actual : 39.98
PWM Channel : 5, programmed Period (us): 166666.67, actual : 166678, programmed DutyCycle : 45.00, actual : 44.98
PWM Channel : 6, programmed Period (us): 142857.14, actual : 142854, programmed DutyCycle : 50.00, actual : 49.98
PWM Channel : 7, programmed Period (us): 125000.00, actual : 125008, programmed DutyCycle : 55.00, actual : 54.98
PWM Channel : 8, programmed Period (us): 111111.11, actual : 111143, programmed DutyCycle : 60.00, actual : 59.95
PWM Channel : 9, programmed Period (us): 100000.00, actual : 100003, programmed DutyCycle : 65.00, actual : 64.99
PWM Channel : 10, programmed Period (us): 66666.66, actual : 66676, programmed DutyCycle : 70.00, actual : 69.95
PWM Channel : 11, programmed Period (us): 50000.00, actual : 50030, programmed DutyCycle : 75.00, actual : 74.89
PWM Channel : 12, programmed Period (us): 40000.00, actual : 40008, programmed DutyCycle : 80.00, actual : 79.93
PWM Channel : 13, programmed Period (us): 33333.33, actual : 33375, programmed DutyCycle : 85.00, actual : 84.88
PWM Channel : 14, programmed Period (us): 25000.00, actual : 25040, programmed DutyCycle : 90.00, actual : 89.82
PWM Channel : 15, programmed Period (us): 20000.00, actual : 19995, programmed DutyCycle : 95.00, actual : 94.91
SimpleTimer (ms): 2000, us : 33060835, Dus : 10103381
PWM Channel : 0, programmed Period (us): 1000000.00, actual : 1000000, programmed DutyCycle : 5.00, actual : 5.00
PWM Channel : 1, programmed Period (us): 500000.00, actual : 500029, programmed DutyCycle : 10.00, actual : 10.00
PWM Channel : 2, programmed Period (us): 333333.34, actual : 333354, programmed DutyCycle : 20.00, actual : 19.99
PWM Channel : 3, programmed Period (us): 250000.00, actual : 249993, programmed DutyCycle : 30.00, actual : 30.00
PWM Channel : 4, programmed Period (us): 200000.00, actual : 200017, programmed DutyCycle : 40.00, actual : 40.00
PWM Channel : 5, programmed Period (us): 166666.67, actual : 166676, programmed DutyCycle : 45.00, actual : 45.00
PWM Channel : 6, programmed Period (us): 142857.14, actual : 142867, programmed DutyCycle : 50.00, actual : 49.98
PWM Channel : 7, programmed Period (us): 125000.00, actual : 125008, programmed DutyCycle : 55.00, actual : 54.97
PWM Channel : 8, programmed Period (us): 111111.11, actual : 111122, programmed DutyCycle : 60.00, actual : 59.97
PWM Channel : 9, programmed Period (us): 100000.00, actual : 100020, programmed DutyCycle : 65.00, actual : 64.96
PWM Channel : 10, programmed Period (us): 66666.66, actual : 66652, programmed DutyCycle : 70.00, actual : 70.00
PWM Channel : 11, programmed Period (us): 50000.00, actual : 50024, programmed DutyCycle : 75.00, actual : 74.90
PWM Channel : 12, programmed Period (us): 40000.00, actual : 40028, programmed DutyCycle : 80.00, actual : 79.92
PWM Channel : 13, programmed Period (us): 33333.33, actual : 33343, programmed DutyCycle : 85.00, actual : 84.90
PWM Channel : 14, programmed Period (us): 25000.00, actual : 25001, programmed DutyCycle : 90.00, actual : 89.95
PWM Channel : 15, programmed Period (us): 20000.00, actual : 20061, programmed DutyCycle : 95.00, actual : 94.81
The following is the sample terminal output when running example ISR_16_PWMs_Array on nRF52_MBED-based Nano 33 BLE to demonstrate how to use multiple PWM channels with simple callback functions.
Starting ISR_16_PWMs_Array on Nano 33 BLE
NRF52_MBED_Slow_PWM v1.2.2
[PWM] Timer = NRF_TIMER3 , Timer Clock (Hz) = 16000000.00
[PWM] Frequency = 100000.00 , _count = 160
Starting ITimer OK, micros() = 2802084
Channel : 0 Period : 1000000 OnTime : 50000 Start_Time : 2804151
Channel : 1 Period : 500000 OnTime : 50000 Start_Time : 2807308
Channel : 2 Period : 333333 OnTime : 66666 Start_Time : 2810368
Channel : 3 Period : 250000 OnTime : 75000 Start_Time : 2813604
Channel : 4 Period : 200000 OnTime : 80000 Start_Time : 2816788
Channel : 5 Period : 166666 OnTime : 74999 Start_Time : 2820089
Channel : 6 Period : 142857 OnTime : 71428 Start_Time : 2823211
Channel : 7 Period : 125000 OnTime : 68750 Start_Time : 2826543
Channel : 8 Period : 111111 OnTime : 66666 Start_Time : 2829799
Channel : 9 Period : 100000 OnTime : 65000 Start_Time : 2833222
Channel : 10 Period : 66666 OnTime : 46666 Start_Time : 2836654
Channel : 11 Period : 50000 OnTime : 37500 Start_Time : 2839972
Channel : 12 Period : 40000 OnTime : 32000 Start_Time : 2843511
Channel : 13 Period : 33333 OnTime : 28333 Start_Time : 2846912
Channel : 14 Period : 25000 OnTime : 22500 Start_Time : 2850523
Channel : 15 Period : 20000 OnTime : 19000 Start_Time : 2853974
The following is the sample terminal output when running example ISR_16_PWMs_Array_Simple on nRF52_MBED-based Nano 33 BLE to demonstrate how to use multiple PWM channels.
Starting ISR_16_PWMs_Array_Simple on Nano 33 BLE
NRF52_MBED_Slow_PWM v1.2.2
[PWM] Timer = NRF_TIMER3 , Timer Clock (Hz) = 16000000.00
[PWM] Frequency = 100000.00 , _count = 160
Starting ITimer OK, micros() = 3202330
Channel : 0 Period : 1000000 OnTime : 50000 Start_Time : 3204240
Channel : 1 Period : 500000 OnTime : 50000 Start_Time : 3207337
Channel : 2 Period : 333333 OnTime : 66666 Start_Time : 3210465
Channel : 3 Period : 250000 OnTime : 75000 Start_Time : 3213666
Channel : 4 Period : 200000 OnTime : 80000 Start_Time : 3216872
Channel : 5 Period : 166666 OnTime : 74999 Start_Time : 3220014
Channel : 6 Period : 142857 OnTime : 71428 Start_Time : 3223261
Channel : 7 Period : 125000 OnTime : 68750 Start_Time : 3226495
Channel : 8 Period : 111111 OnTime : 66666 Start_Time : 3229851
Channel : 9 Period : 100000 OnTime : 65000 Start_Time : 3233165
Channel : 10 Period : 66666 OnTime : 46666 Start_Time : 3236525
Channel : 11 Period : 50000 OnTime : 37500 Start_Time : 3239882
Channel : 12 Period : 40000 OnTime : 32000 Start_Time : 3243149
Channel : 13 Period : 33333 OnTime : 28333 Start_Time : 3246655
Channel : 14 Period : 25000 OnTime : 22500 Start_Time : 3250177
Channel : 15 Period : 20000 OnTime : 19000 Start_Time : 3253635
The following is the sample terminal output when running example ISR_Modify_PWM on nRF52_MBED-based Nano 33 BLE to demonstrate how to modify PWM settings on-the-fly without deleting the PWM channel
Starting ISR_Modify_PWM on Nano 33 BLE
NRF52_MBED_Slow_PWM v1.2.2
[PWM] Timer = NRF_TIMER3 , Timer Clock (Hz) = 16000000.00
[PWM] Frequency = 50000.00 , _count = 320
Starting ITimer OK, micros() = 2703294
Using PWM Freq = 200.00, PWM DutyCycle = 1.00
Channel : 0 Period : 5000 OnTime : 50 Start_Time : 3311523
Channel : 0 Period : 10000 OnTime : 555 Start_Time : 13313476
Channel : 0 Period : 5000 OnTime : 50 Start_Time : 23309570
Channel : 0 Period : 10000 OnTime : 555 Start_Time : 33310546
Channel : 0 Period : 5000 OnTime : 50 Start_Time : 43306640
Channel : 0 Period : 10000 OnTime : 555 Start_Time : 53313476
Channel : 0 Period : 5000 OnTime : 50 Start_Time : 63309570
Channel : 0 Period : 10000 OnTime : 555 Start_Time : 73316406
Channel : 0 Period : 5000 OnTime : 50 Start_Time : 83312500
Channel : 0 Period : 10000 OnTime : 555 Start_Time : 93319335
Channel : 0 Period : 5000 OnTime : 50 Start_Time : 103315429
Channel : 0 Period : 10000 OnTime : 555 Start_Time : 113322265
Channel : 0 Period : 5000 OnTime : 50 Start_Time : 123318359
Channel : 0 Period : 10000 OnTime : 555 Start_Time : 133325195
Channel : 0 Period : 5000 OnTime : 50 Start_Time : 143326171
Channel : 0 Period : 10000 OnTime : 555 Start_Time : 153322265
Channel : 0 Period : 5000 OnTime : 50 Start_Time : 163318359
Channel : 0 Period : 10000 OnTime : 555 Start_Time : 173325195
Channel : 0 Period : 5000 OnTime : 50 Start_Time : 183321289
Channel : 0 Period : 10000 OnTime : 555 Start_Time : 193328125
Channel : 0 Period : 5000 OnTime : 50 Start_Time : 203324218
Channel : 0 Period : 10000 OnTime : 555 Start_Time : 213331054
Channel : 0 Period : 5000 OnTime : 50 Start_Time : 223327148
Channel : 0 Period : 10000 OnTime : 555 Start_Time : 233333984
The following is the sample terminal output when running example ISR_Changing_PWM on nRF52_MBED-based Nano 33 BLE to demonstrate how to modify PWM settings on-the-fly by deleting the PWM channel and reinit the PWM channel
Starting ISR_Changing_PWM on Nano 33 BLE
NRF52_MBED_Slow_PWM v1.2.2
[PWM] Timer = NRF_TIMER3 , Timer Clock (Hz) = 16000000.00
[PWM] Frequency = 50000.00 , _count = 320
Starting ITimer OK, micros() = 3024808
Using PWM Freq = 1.00, PWM DutyCycle = 50.00
Channel : 0 Period : 1000000 OnTime : 500000 Start_Time : 3027194
Using PWM Freq = 2.00, PWM DutyCycle = 90.00
Channel : 0 Period : 500000 OnTime : 450000 Start_Time : 13035894
Using PWM Freq = 1.00, PWM DutyCycle = 50.00
Channel : 0 Period : 1000000 OnTime : 500000 Start_Time : 23048753
Debug is enabled by default on Serial.
You can also change the debugging level _PWM_LOGLEVEL_
from 0 to 4
// Don't define _PWM_LOGLEVEL_ > 0. Only for special ISR debugging only. Can hang the system.
#define _PWM_LOGLEVEL_ 0
If you get compilation errors, more often than not, you may need to install a newer version of the core for Arduino boards.
Sometimes, the library will only work if you update the board core to the latest version because I am using newly added functions.
Submit issues to: nRF52_MBED_Slow_PWM issues
- Search for bug and improvement.
- Similar features for remaining Arduino boards
- Basic hardware multi-channel PWM for nRF52_MBED-based Nano-33-BLE or Nano-33-BLE_Sense, etc. using
Arduino mbed_nano core 2.5.2+
orArduino mbed core v1.3.2-
- Add Table of Contents
- Add functions to modify PWM settings on-the-fly
- Fix
multiple-definitions
linker error - Optimize library code by using
reference-passing
instead ofvalue-passing
- Improve accuracy by using
float
, instead ofuint32_t
fordutycycle
- DutyCycle to be optionally updated at the end current PWM period instead of immediately.
- Display informational warning only when
_PWM_LOGLEVEL_
> 3 - Add support to Seeeduino nRF52840-based boards such as SEEED_XIAO_NRF52840 and SEEED_XIAO_NRF52840_SENSE, etc. using Seeeduino
mbed
core - Add astyle using
allman
style. Restyle the library
Many thanks for everyone for bug reporting, new feature suggesting, testing and contributing to the development of this library.
If you want to contribute to this project:
- Report bugs and errors
- Ask for enhancements
- Create issues and pull requests
- Tell other people about this library
- The library is licensed under MIT
Copyright (c) 2021- Khoi Hoang