ALTSOFT HTML PDF

Yet another alternate software serial exists for only Arduino Uno , using timer2 and pins 3 and 4. Only one AltSoftSerial can be used, with the fixed pin assignments shown above. This works the same as Serial. If nothing has been received, -1 is returned. Most libraries, HardwareSerial, and the millis timekeeping interrupt are designed to minimize CPU time spend executing interrupts or accessing data with interrupts disabled.

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Yet another alternate software serial exists for only Arduino Uno , using timer2 and pins 3 and 4. Only one AltSoftSerial can be used, with the fixed pin assignments shown above. This works the same as Serial. If nothing has been received, -1 is returned. Most libraries, HardwareSerial, and the millis timekeeping interrupt are designed to minimize CPU time spend executing interrupts or accessing data with interrupts disabled. However, some libraries may disable interrupts for longer than 1 bit time.

If they do, AltSoftSerial will not work properly. If you discover erroneous results from AltSoftSerial, please try testing without other libraries.

Timer Usage AltSoftSerial uses a 16 bit hardware timer to generate the transmit output and measure the receive input waveforms.

Any other library which needs the same timer, and the PWM pins which depend upon that timer, will not work. This may allow AltSoftSerial to be used together with other libraries which require the timer which AltSoftSerial uses by default.

However, the maximum baud rate is often not the most important question. Each library imposes interrupt latency on other libraries. SoftwareSerial causes 10 bit times of latency for other libraries. To see this in action, you can try the example that comes with SoftwareSerial in Arduino 1.

The characters "dnigh" are lost. The reason is because while SoftwareSerial is sending the letter "G" at , the letters "oodnigh" arrive at baud. Only "oo" are held in the UART registers. The rest are lost because interrupts were disabled for too long. AltSoftSerial can handle this test easily, since it does not lock out interrupts for long times. However, the baud rates must be chosen carefully!

Because SoftwareSerial creates 10 bit times of latency for other libraries, it should be used for a device needing high baud rate. SoftwareSerial should NOT be used at slow baud rates, because it will interfere with the other ports.

SoftwareSerial can not simultaenously transmit and receive, so it should be used with a device that never sends in both directions at once. HardwareSerial can tolerate up to 20 bit times latency for receive, or 10 bit times for non-stop transmit. If continuous transmit is not needed, HardwareSerial can use a baud rate almost twice as fast as SoftwareSerial and still reliably receive. AltSoftSerial can tolerate almost 1 bit time latency, so its baud rate must be at least 10 times less than the baud rate used for SoftwareSerial.

If the baud rates are chosen wisely, all 3 can work together reliably!

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AltSoftSerial Library

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