libraries/IRremote/src/private/IRTimer.hpp

@@ -2072,6 +2072,65 @@ extern "C" void __attribute__((noinline, section(".ram_text"), optimize("O3")))
   TIM16_CLEAR_INT_MASK(htimer16_0, 0xFFFFFFFF); // reset timer interrupt flags
 }
 
+# if defined(SEND_PWM_BY_TIMER)
+#include "pins_arduino.h"
+#define IR_SEND_PIN        3
+
+static TIMER32_HandleTypeDef            ir_sender_htimer;
+static TIMER32_CHANNEL_HandleTypeDef    ir_sender_htimer_channel;
+
+/*
+ * timerConfigForSend() is used exclusively by IRsend::enableIROut()
+ * Set output pin mode and disable receive interrupt if it uses the same resource
+ */
+void timerConfigForSend(uint16_t aFrequencyKHz) 
+{
+    uint32_t pwmTopVal = 0;
+    if ((aFrequencyKHz*1000) <= PWM_FREQUENCY_MAX)
+        pwmTopVal = F_CPU/(aFrequencyKHz*1000)-3;
+    else
+        ErrorMsgHandler("timerConfigForSend(): invalid frequency for IR sending");
+
+    // initialization of the required timer
+    ir_sender_htimer.Instance         = pwmPinToTimer(IR_SEND_PIN);
+    ir_sender_htimer.Top              = pwmTopVal;
+    ir_sender_htimer.State            = TIMER32_STATE_DISABLE;
+    ir_sender_htimer.Clock.Source     = TIMER32_SOURCE_PRESCALER;
+    ir_sender_htimer.Clock.Prescaler  = 0; // Prescaler = 1
+    ir_sender_htimer.InterruptMask    = 0;
+    ir_sender_htimer.CountMode        = TIMER32_COUNTMODE_FORWARD;
+    HAL_Timer32_Init(&ir_sender_htimer);
+    
+    // gpio init as timer channel pin
+    HAL_GPIO_PinConfig(digitalPinToPort(IR_SEND_PIN), digitalPinToBitMask(IR_SEND_PIN), 
+                    HAL_GPIO_MODE_TIMER_SERIAL, HAL_GPIO_PULL_NONE, HAL_GPIO_DS_2MA);
+
+    ir_sender_htimer_channel.TimerInstance  = ir_sender_htimer.Instance;
+    ir_sender_htimer_channel.ChannelIndex   = pwmPinToTimerChannel(IR_SEND_PIN);
+    ir_sender_htimer_channel.PWM_Invert     = TIMER32_CHANNEL_NON_INVERTED_PWM;
+    ir_sender_htimer_channel.Mode           = TIMER32_CHANNEL_MODE_PWM;
+    ir_sender_htimer_channel.CaptureEdge    = TIMER32_CHANNEL_CAPTUREEDGE_RISING;
+    ir_sender_htimer_channel.OCR            = ((pwmTopVal * IR_SEND_DUTY_CYCLE_PERCENT)/100);
+    ir_sender_htimer_channel.Noise          = TIMER32_CHANNEL_FILTER_OFF;
+    HAL_Timer32_Channel_Init(&ir_sender_htimer_channel);
+
+    HAL_Timer32_Start(&ir_sender_htimer);
+}
+
+void enableSendPWMByTimer() 
+{
+    // start timer with initialized channel
+    HAL_Timer32_Value_Clear(&ir_sender_htimer);
+    HAL_Timer32_Channel_Enable(&ir_sender_htimer_channel);
+}
+
+void disableSendPWMByTimer()
+{
+    HAL_Timer32_Channel_Disable(&ir_sender_htimer_channel);
+    digitalWriteFast(IR_SEND_PIN, 1);
+}
+# endif // defined(SEND_PWM_BY_TIMER)
+
 /***************************************
  * Unknown CPU board
  ***************************************/