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Documentation update

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- mention analogWriteRange and analogWriteFreq
- update change log
- add pwm output symbol for pin 16 to svg
This commit is contained in:
Ivan Grokhotkov
2015-07-23 01:29:12 +03:00
parent 11594b1340
commit d35b72d41c
4 changed files with 37 additions and 11 deletions
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doc/reference.md
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@ -17,6 +17,10 @@ Digital pins 6—11 are not shown on this diagram because they are used to conne
Note that some boards and modules (ESP-12ED, NodeMCU 1.0) also break out pins 9 and 11. These may be used as IO if flash chip works in DIO mode (as opposed to QIO, which is the default one).
Pin interrupts are supported through `attachInterrupt`, `detachInterrupt` functions.
Interrupts may be attached to any GPIO pin, except GPIO16. Standard Arduino interrupt
types are supported: `CHANGE`, `RISING`, `FALLING`.
## Analog input
ESP8266 has a single ADC channel available to users. It may be used either to read voltage at ADC pin, or to read module supply voltage (VCC).
@ -34,12 +38,9 @@ This line has to appear outside of any functions, for instance right after the `
## Analog output
`analogWrite(pin, value)` enables software PWM on the given pin. PWM may be used on pins 0 to 16.
Call `analogWrite(pin, 0)` to disable PWM on the pin. `value` may be in range from 0 to `PWMRANGE`, which is currently equal to 1023.
Pin interrupts are supported through `attachInterrupt`, `detachInterrupt` functions.
Interrupts may be attached to any GPIO pin, except GPIO16. Standard Arduino interrupt
types are supported: `CHANGE`, `RISING`, `FALLING`.
Call `analogWrite(pin, 0)` to disable PWM on the pin. `value` may be in range from 0 to `PWMRANGE`, which is equal to 1023 by default. PWM range may be changed by calling `analogWriteRange(new_range)`.
PWM frequency is 1kHz by default. Call `analogWriteFreq(new_frequency)` to change the frequency.
## Timing and delays
`millis()` and `micros()` return the number of milliseconds and microseconds elapsed after reset, respectively.