FspTimer: add end() and set_frequency() APIs

Author: facchinm

cores/arduino/FspTimer.cpp

@@ -17,6 +17,11 @@ FspTimer::FspTimer(): init_ok(false), agt_timer(nullptr), gpt_timer(nullptr), ty
 }
 
 FspTimer::~FspTimer() {
+    end();
+}
+
+void FspTimer::end() {
+    close();
     if(agt_timer != nullptr) {
         agt_used_channel[timer_cfg.channel] = TIMER_FREE;
         delete agt_timer;
@@ -430,6 +435,9 @@ bool FspTimer::set_period_us(double us) {
     return set_period_ms(us/1000.0);
 }
 
+bool FspTimer::set_frequency(float hz) {
+    return set_period_ms(1000/hz);
+}
 
 /* -------------------------------------------------------------------------- */
 bool FspTimer::set_period(uint32_t p) {

cores/arduino/FspTimer.h

@@ -132,6 +132,8 @@ class FspTimer {
     bool begin(timer_mode_t mode, uint8_t type, uint8_t channel,  float freq_hz, float duty_perc, GPTimerCbk_f cbk = nullptr , void *ctx = nullptr );
     bool begin(timer_mode_t mode, uint8_t type, uint8_t channel,  uint32_t period, uint32_t pulse, timer_source_div_t sd, GPTimerCbk_f cbk = nullptr , void *ctx = nullptr);
 
+    void end();
+
     void set_irq_callback(GPTimerCbk_f cbk , void *ctx = nullptr );
 
     bool setup_overflow_irq(uint8_t priority = 12,  Irq_f isr_fnc = nullptr );
@@ -149,6 +151,7 @@ class FspTimer {
 
     uint32_t get_period_raw();
     void add_pwm_extended_cfg();
+    bool set_frequency(float hz);
     bool set_period_ms(double ms);
     bool set_period_us(double us);
     bool set_pulse_ms(double ms,TimerPWMChannel_t pwm_ch);