cobrce / shiftpwm

Arduino library to generate a PWM signal over a shift register (74HC595)

ShiftPWM

ShiftPWM is a library/class for Arduino (tested on ESP32 only) to generate a PWM signal over a shift register (74HC595)

How to use:

• copy ShiftPWM.h and ShiftPWM.cpp in the same folder of your program
• add include "ShiftPWM.h"
• Create instance of ShiftPWM by specifying duty cycles in Duties struct (can be updated later)
• Create a timer (preferably 1MHz), in its handler call ShiftPWM::Calculate() which returns a byte
• Write the byte returned from Calculate() to the shift register
• [ESP] To make timer creation simpler include ESPTimerHelper.h then call StartTimer(SetTimer(TIMER_INDEX,TIMER_HANDLER))

Update:

The class doesn't write the value to shift register anymore but returns a value, this is done to make it compatible with other environments (the ones that don't have pinMode, digtalWrite...etc)

shiftpwm's Issues

Esp32 Error

Error with ESP32

1- Using "example.ino"
2- Checking code (before compiling)
3- Error:

In file included from C:\Users\Tiago\AppData\Local\Temp\arduino_modified_sketch_857920\example.ino:6:0:

C:\Users\Tiago\Documents\Arduino\libraries\ShiftPWM-master/ESPTimerHelper.h:5:17: error: variable or field 'StartTimer' declared void

 void StartTimer(hw_timer_t * timer);

                 ^

C:\Users\Tiago\Documents\Arduino\libraries\ShiftPWM-master/ESPTimerHelper.h:5:17: error: 'hw_timer_t' was not declared in this scope

C:\Users\Tiago\Documents\Arduino\libraries\ShiftPWM-master/ESPTimerHelper.h:5:30: error: 'timer' was not declared in this scope

 void StartTimer(hw_timer_t * timer);

                              ^

C:\Users\Tiago\Documents\Arduino\libraries\ShiftPWM-master/ESPTimerHelper.h:6:1: error: 'hw_timer_t' does not name a type

 hw_timer_t * SetTimer(int timer,void(*callback)(),int periode_us = 10);

 ^

C:\Users\Tiago\AppData\Local\Temp\arduino_modified_sketch_857920\example.ino: In function 'void InitPWMTimer()':

example:33:58: error: 'SetTimer' was not declared in this scope

 void InitPWMTimer() { StartTimer(SetTimer(0, TimerHandler)); }

                                                          ^

example:33:59: error: 'StartTimer' was not declared in this scope

 void InitPWMTimer() { StartTimer(SetTimer(0, TimerHandler)); }

                                                           ^

C:\Users\Tiago\AppData\Local\Temp\arduino_modified_sketch_857920\example.ino: In function 'void InitDutyChangeTimer()':

example:53:57: error: 'SetTimer' was not declared in this scope

     StartTimer(SetTimer(1, DutyChangeTimerHandler, 10000));

                                                         ^

example:53:58: error: 'StartTimer' was not declared in this scope

     StartTimer(SetTimer(1, DutyChangeTimerHandler, 10000));

                                                          ^

exit status 1
'SetTimer' was not declared in this scope