Added macro USE_ACTIVE_HIGH_OUTPUT_FOR_SEND_PIN

Author: ArminJo

README.md

@@ -711,24 +711,25 @@ Modify them by enabling / disabling them, or change the values if applicable.
 
 | Name | Default value | Description |
 |-|-:|-|
-| `RAW_BUFFER_LENGTH` |  100 | Buffer size of raw input buffer. Must be even! 100 is sufficient for *regular* protocols of up to 48 bits, but for most air conditioner protocols a value of up to 750 is required. Use the ReceiveDump example to find smallest value for your requirements. |
-| `EXCLUDE_UNIVERSAL_PROTOCOLS` |  disabled | Excludes the universal decoder for pulse distance protocols and decodeHash (special decoder for all protocols) from `decode()`. Saves up to 1000 bytes program memory. |
-| `DECODE_<Protocol name>` |  all | Selection of individual protocol(s) to be decoded. You can specify multiple protocols. See [here](https://github.com/Arduino-IRremote/Arduino-IRremote/blob/master/src/IRremote.hpp#L98-L121)  |
+| `RAW_BUFFER_LENGTH` | 100 | Buffer size of raw input buffer. Must be even! 100 is sufficient for *regular* protocols of up to 48 bits, but for most air conditioner protocols a value of up to 750 is required. Use the ReceiveDump example to find smallest value for your requirements. |
+| `EXCLUDE_UNIVERSAL_PROTOCOLS` | disabled | Excludes the universal decoder for pulse distance protocols and decodeHash (special decoder for all protocols) from `decode()`. Saves up to 1000 bytes program memory. |
+| `DECODE_<Protocol name>` | all | Selection of individual protocol(s) to be decoded. You can specify multiple protocols. See [here](https://github.com/Arduino-IRremote/Arduino-IRremote/blob/master/src/IRremote.hpp#L98-L121)  |
 | `DECODE_STRICT_CHECKS` |  disabled | Check for additional required characteristics of protocol timing like length of mark for a constant mark protocol, where space length determines the bit value. Requires up to 194 additional bytes of program memory. |
 | `IR_REMOTE_DISABLE_RECEIVE_COMPLETE_CALLBACK` |  disabled | Saves up to 60 bytes of program memory and 2 bytes RAM. |
-| `MARK_EXCESS_MICROS` |  20 | MARK_EXCESS_MICROS is subtracted from all marks and added to all spaces before decoding, to compensate for the signal forming of different IR receiver modules. |
-| `RECORD_GAP_MICROS` |  5000 | Minimum gap between IR transmissions, to detect the end of a protocol.<br/>Must be greater than any space of a protocol e.g. the NEC header space of 4500 &micro;s.<br/>Must be smaller than any gap between a command and a repeat; e.g. the retransmission gap for Sony is around 24 ms.<br/>Keep in mind, that this is the delay between the end of the received command and the start of decoding. |
-| `IR_INPUT_IS_ACTIVE_HIGH` |  disabled | Enable it if you use a RF receiver, which has an active HIGH output signal. |
-| `IR_SEND_PIN` |  disabled | If specified, it reduces program size and improves send timing for AVR. If you want to use a variable to specify send pin e.g. with `setSendPin(uint8_t aSendPinNumber)`, you must not use / disable this macro in your source. |
-| `SEND_PWM_BY_TIMER` |  disabled | Disables carrier PWM generation in software and use hardware PWM (by timer). Has the advantage of more exact PWM generation, especially the duty cycle (which is not very relevant for most IR receiver circuits), and the disadvantage of using a hardware timer, which in turn is not available for other libraries and to fix the send pin (but not the receive pin) at the [dedicated timer output pin(s)](https://github.com/Arduino-IRremote/Arduino-IRremote?tab=readme-ov-file#timer-and-pin-usage). Is enabled for ESP32 and RP2040 in all examples, since they support PWM gereration for each pin without using a shared resource (timer). |
-| `USE_NO_SEND_PWM` |  disabled | Uses no carrier PWM, just simulate an **active low** receiver signal. Used for transferring signal by cable instead of IR. Overrides `SEND_PWM_BY_TIMER` definition. |
-| `IR_SEND_DUTY_CYCLE_PERCENT` |  30 | Duty cycle of IR send signal. |
-| `USE_OPEN_DRAIN_OUTPUT_FOR_SEND_PIN` |  disabled | Uses or simulates open drain output mode at send pin. **Attention, active state of open drain is LOW**, so connect the send LED between positive supply and send pin! |
-| `DISABLE_CODE_FOR_RECEIVER` |  disabled |  Disables static receiver code like receive timer ISR handler and static IRReceiver and irparams data. Saves 450 bytes program memory and 269 bytes RAM if receiving functions are not required. |
-| `EXCLUDE_EXOTIC_PROTOCOLS` |  disabled | Excludes BANG_OLUFSEN, BOSEWAVE, WHYNTER, FAST and LEGO_PF from `decode()` and from sending with `IrSender.write()`. Saves up to 650 bytes program memory. |
-| `FEEDBACK_LED_IS_ACTIVE_LOW` |  disabled | Required on some boards (like my BluePill and my ESP8266 board), where the feedback LED is active low. |
-| `NO_LED_FEEDBACK_CODE` |  disabled | Disables the LED feedback code for send and receive. Saves around 100 bytes program memory for receiving, around 500 bytes for sending and halving the receiver ISR (Interrupt Service Routine) processing time. |
-| `MICROS_PER_TICK` |  50 | Resolution of the raw input buffer data. Corresponds to 2 pulses of each 26.3 &micro;s at 38 kHz. |
+| `MARK_EXCESS_MICROS` | 20 | MARK_EXCESS_MICROS is subtracted from all marks and added to all spaces before decoding, to compensate for the signal forming of different IR receiver modules. |
+| `RECORD_GAP_MICROS` | 5000 | Minimum gap between IR transmissions, to detect the end of a protocol.<br/>Must be greater than any space of a protocol e.g. the NEC header space of 4500 &micro;s.<br/>Must be smaller than any gap between a command and a repeat; e.g. the retransmission gap for Sony is around 24 ms.<br/>Keep in mind, that this is the delay between the end of the received command and the start of decoding. |
+| `IR_INPUT_IS_ACTIVE_HIGH` | disabled | Enable it if you use a RF receiver, which has an active HIGH output signal. |
+| `IR_SEND_PIN` | disabled | If specified, it reduces program size and improves send timing for AVR. If you want to use a variable to specify send pin e.g. with `setSendPin(uint8_t aSendPinNumber)`, you must not use / disable this macro in your source. |
+| `SEND_PWM_BY_TIMER` | disabled | Disables carrier PWM generation in software and use hardware PWM (by timer). Has the advantage of more exact PWM generation, especially the duty cycle (which is not very relevant for most IR receiver circuits), and the disadvantage of using a hardware timer, which in turn is not available for other libraries and to fix the send pin (but not the receive pin) at the [dedicated timer output pin(s)](https://github.com/Arduino-IRremote/Arduino-IRremote?tab=readme-ov-file#timer-and-pin-usage). Is enabled for ESP32 and RP2040 in all examples, since they support PWM gereration for each pin without using a shared resource (timer). |
+| `IR_SEND_DUTY_CYCLE_PERCENT` | 30 | Duty cycle of IR send signal. |
+| `USE_NO_SEND_PWM` | disabled | Uses no carrier PWM, just simulate an **active low** receiver signal. Used for transferring signal by cable instead of IR. Overrides `SEND_PWM_BY_TIMER` definition. |
+| `USE_OPEN_DRAIN_OUTPUT_FOR_SEND_PIN` | disabled | Uses or simulates open drain output mode at send pin. **Attention, active state of open drain is LOW**, so connect the send LED between positive supply and send pin! |
+| `USE_ACTIVE_HIGH_OUTPUT_FOR_SEND_PIN` | disabled | Only if `USE_NO_SEND_PWM` is enabled. Simulate an **active high** receiver signal instead of an active low signal. |
+| `DISABLE_CODE_FOR_RECEIVER` | disabled |  Disables static receiver code like receive timer ISR handler and static IRReceiver and irparams data. Saves 450 bytes program memory and 269 bytes RAM if receiving functions are not required. |
+| `EXCLUDE_EXOTIC_PROTOCOLS` | disabled | Excludes BANG_OLUFSEN, BOSEWAVE, WHYNTER, FAST and LEGO_PF from `decode()` and from sending with `IrSender.write()`. Saves up to 650 bytes program memory. |
+| `FEEDBACK_LED_IS_ACTIVE_LOW` | disabled | Required on some boards (like my BluePill and my ESP8266 board), where the feedback LED is active low. |
+| `NO_LED_FEEDBACK_CODE` | disabled | Disables the LED feedback code for send and receive. Saves around 100 bytes program memory for receiving, around 500 bytes for sending and halving the receiver ISR (Interrupt Service Routine) processing time. |
+| `MICROS_PER_TICK` | 50 | Resolution of the raw input buffer data. Corresponds to 2 pulses of each 26.3 &micro;s at 38 kHz. |
 | `TOLERANCE_FOR_DECODERS_MARK_OR_SPACE_MATCHING` | 25 | Relative tolerance (in percent) for matchTicks(), matchMark() and matchSpace() functions used for protocol decoding. |
 | `DEBUG` | disabled | Enables lots of lovely debug output. |
 | `IR_USE_AVR_TIMER*` |  | Selection of timer to be used for generating IR receiving sample interval. |

examples/SendDemo/SendDemo.ino

@@ -40,8 +40,9 @@
 //#define EXCLUDE_EXOTIC_PROTOCOLS  // Saves around 240 bytes program memory if IrSender.write is used
 //#define SEND_PWM_BY_TIMER         // Disable carrier PWM generation in software and use (restricted) hardware PWM.
 //#define USE_NO_SEND_PWM           // Use no carrier PWM, just simulate an active low receiver signal. Overrides SEND_PWM_BY_TIMER definition
+//#define USE_ACTIVE_HIGH_OUTPUT_FOR_SEND_PIN // Simulate an active high receiver signal instead of an active low signal.
+//#define USE_OPEN_DRAIN_OUTPUT_FOR_SEND_PIN  // Use or simulate open drain output mode at send pin. Attention, active state of open drain is LOW, so connect the send LED between positive supply and send pin!
 //#define NO_LED_FEEDBACK_CODE      // Saves 566 bytes program memory
-//#define USE_OPEN_DRAIN_OUTPUT_FOR_SEND_PIN // Use or simulate open drain output mode at send pin. Attention, active state of open drain is LOW, so connect the send LED between positive supply and send pin!
 
 //#undef IR_SEND_PIN // enable this, if you need to set send pin programmatically using uint8_t tSendPin below
 #include <IRremote.hpp>

src/IRSend.hpp

@@ -968,7 +968,10 @@ void IRsend::mark(uint16_t aMarkMicros) {
      * Here we generate no carrier PWM, just simulate an active low receiver signal.
      */
 #  if defined(USE_OPEN_DRAIN_OUTPUT_FOR_SEND_PIN) && !defined(OUTPUT_OPEN_DRAIN)
+    // Here we have no hardware supported Open Drain outputs, so we must mimicking it
     pinModeFast(sendPin, OUTPUT); // active state for mimicking open drain
+#  elif defined(USE_ACTIVE_HIGH_OUTPUT_FOR_SEND_PIN)
+    digitalWriteFast(sendPin, HIGH); // Set output to active high.
 #  else
     digitalWriteFast(sendPin, LOW); // Set output to active low.
 #  endif
@@ -1114,6 +1117,8 @@ void IRsend::IRLedOff() {
 #  if defined(USE_OPEN_DRAIN_OUTPUT_FOR_SEND_PIN) && !defined(OUTPUT_OPEN_DRAIN)
     digitalWriteFast(sendPin, LOW); // prepare for all next active states.
     pinModeFast(sendPin, INPUT);// inactive state for open drain
+#  elif defined(USE_ACTIVE_HIGH_OUTPUT_FOR_SEND_PIN)
+    digitalWriteFast(sendPin, LOW); // Set output to inactive low.
 #  else
     digitalWriteFast(sendPin, HIGH); // Set output to inactive high.
 #  endif