FastPWM
Fork of FastPWM by
Device/FastPWM_STM_TIM.cpp
- Committer:
- Sissors
- Date:
- 2015-06-20
- Revision:
- 24:1f451660d8c0
- Parent:
- 22:db9c0cf445e2
- Child:
- 28:3c8a0d977bc3
File content as of revision 24:1f451660d8c0:
//This should (hopefully) work on all STM targets which use TIM timers for PWM #ifdef TARGET_STM #include "FastPWM.h" typedef __IO uint32_t* CHANNEL_P_T; #define PWM_CHANNEL (**(CHANNEL_P_T*)fast_obj) #define PWM_TIMER ((TIM_TypeDef*)_pwm.pwm) extern CHANNEL_P_T getChannel(TIM_TypeDef* pwm, PinName pin); void FastPWM::initFastPWM( void ) { fast_obj = new (CHANNEL_P_T); *(CHANNEL_P_T*)fast_obj = getChannel(PWM_TIMER, _pwm.pin); //Enable PWM period syncing for glitch free result PWM_TIMER->CR1 |= TIM_CR1_ARPE; bits = 16; } void FastPWM::pulsewidth_ticks( uint32_t ticks ) { PWM_CHANNEL = ticks; } void FastPWM::period_ticks( uint32_t ticks ) { PWM_TIMER->ARR = ticks - 1; } uint32_t FastPWM::getPeriod( void ) { return PWM_TIMER->ARR + 1; } uint32_t FastPWM::setPrescaler(uint32_t reqScale) { if (reqScale == 0) //Return prescaler return PWM_TIMER->PSC + 1; if (reqScale > (uint32_t)(1<<16)) reqScale = 1<<16; //Else set prescaler, we have to substract one from reqScale since a 0 in PCVAL is prescaler of 1 PWM_TIMER->PSC = reqScale - 1; return reqScale; } #endif