void setPWM( uint32_t channel, uint32_t pin, uint32_t frequency, uint32_t dutycycle, callback_function_t PeriodCallback = nullptr, callback_function_t CompareCallback = nullptr) Void setOverflow( uint32_t val, TimerFormat_t format = TICK_FORMAT) // set AutoReload register depending on format provided uint32_t getOverflow(TimerFormat_t format = TICK_FORMAT) // return overflow depending on format provided void setPWM( uint32_t channel, PinName pin, uint32_t frequency, uint32_t dutycycle, callback_function_t PeriodCallback = nullptr, callback_function_t CompareCallback = nullptr) // Set all in one command freq in HZ, Duty in percentage. Void pause( void) // Pause counter and all output channels void pauseChannel( uint32_t channel) // Timer is still running but channel (output and interrupt) is disabled void resume( void) // Resume counter and all output channels void resumeChannel( uint32_t channel) // Resume only one channel void setPrescaleFactor( uint32_t prescaler) // set prescaler register (which is factor value - 1) uint32_t getPrescaleFactor() Whereas other timers have no complementary, or have only 1 or 2 channels.Įach timer may provide several channels, nevertheless it is important to understand that all channels of the same timer share the same counter and thus have the same period/frequency.įor genericity purpose, HardwareTimer library uses all timers like a 16bits timer (even if some may be wider). Some timers have up to 4 output channels with 4 complementary channels.TIM6 and TIM7 doesn't have outpin and this is the reason why, when available, they are used to implement Tone and Servo.
Arduino pwm timer manual#
Please refer to the Reference Manual of your MCU. The use of this library suppose you have some basic knowledge of STM32 hardware timer architecture.įirst of all remind that all timers are not equivalent and doesn't support the same features. The HardwareTimer library aims to provide access to part of STM32 hardware Timer feature (If other features are required, they could be accessed through STM32Cube HAL/LL). #include "FspTimer.Needs Arduino_Core_STM32 version > 1.6.1 1.
Here is a test sketch that is setting up a GPT timer with a corresponding interrupt which executes a callback method at a defined interval rate e.g. The Arduino API implements the FspTimer class which provides all the necessary functionality. To increase the flexibility you can explicitly request a timer which has been reserved for PWM. There are only 2 16 bit AGT timers (but one is already used to provide the Arduino millis() and microseconds() methods) and there are 7 GPT timers which are also used by PWM. The UNO R4 has two timer peripherals: the General PWM Timer (GPT) and the Asynchronous General Purpose Timer (AGT). Unfortunately I did not find any documentation, so I decided to document my findings here.
Arduino pwm timer how to#
I was wondering how to use the timers in the new Arduino UNO R4.
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