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101 lines
3.9 KiB
Markdown
101 lines
3.9 KiB
Markdown
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[](https://github.com/marketplace/actions/arduino_ci)
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[](https://github.com/RobTillaart/PCA9635/actions/workflows/arduino-lint.yml)
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[](https://github.com/RobTillaart/PCA9635/actions/workflows/jsoncheck.yml)
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[](https://github.com/RobTillaart/PCA9635/blob/master/LICENSE)
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[](https://github.com/RobTillaart/PCA9635/releases)
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# PCA9635
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Arduino library for PCA9635 I2C 8 bit PWM LED driver.
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## Description
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This library is to control the I2C PCA9635 PWM extender.
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The 16 channels are independently configurable is steps of 1/256.
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this allows for better than 1% fine tuning of the duty-cycle
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of the PWM signal.
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## Interface
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### Constructor
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- **PCA9635(uint8_t deviceAddress, TwoWire \*wire = &Wire)** Constructor with I2C device address,
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and optional the Wire interface as parameter.
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- **bool begin()** initializes the library after startup. Mandatory.
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- **bool begin(uint8_t sda, uint8_t scl)** idem, ESP32 ESP8266 only. Library does not support
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multiple Wire instances (yet).
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- **void reset()** resets the library to start up conditions.
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- **bool isConnected()** checks if address is available on I2C bus.
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### LedDriverMode
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- **uint8_t setLedDriverMode(uint8_t channel, uint8_t mode)** mode is 0..3 See datasheet for full details.
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- **uint8_t getLedDriverMode(uint8_t channel)** returns the current mode of the channel.
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| LED mode | Value | Description |
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|:-------------------|:-----:|:------------|
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| PCA9635_LEDOFF | 0x00 | led is 100% off, default @startup
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| PCA9635_LEDON | 0x01 | led is 100% on.
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| PCA9635_LEDPWM | 0x02 | set LED in PWM mode, 0..255
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| PCA9635_LEDGRPPWM | 0x03 | add LED to the GRPPWM*
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\* all LEDs in the group GRPPWM can be set to the same PWM value in one set.
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This is ideal to trigger e.g. multiple LEDs (servo's) at same time.
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### Read and write
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- **uint8_t write1(uint8_t channel, uint8_t value)** writes a single 8 bit PWM value.
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- **uint8_t write3(uint8_t channel, uint8_t R, uint8_t G, uint8_t B)** writes three consecutive PWM registers.
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typical use is to write R, G, B values for a full colour LED.
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- **uint8_t writeN(uint8_t channel, uint8_t \* array, uint8_t count)** write count consecutive PWM registers.
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May return **PCA9635_ERR_WRITE** if array has too many elements
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(including channel as offset).
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- **uint8_t writeMode(uint8_t reg, uint8_t value)** configuration of one of the two configuration registers.
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check datasheet for details.
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- **uint8_t readMode(uint8_t reg)** reads back the configured mode,
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useful to add or remove a single flag (bit masking).
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### Group PWM and frequency
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- **void setGroupPWM(uint8_t value)** sets all channels that are part of the PWM group to value.
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- **uint8_t getGroupPWM()** get the current PWM setting of the group.
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- **void setGroupFREQ(value)** see datasheet for details.
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- **uint8_t getGroupFREQ()** returns the freq of the PWM group.
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### Miscellaneous
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- **int lastError()** returns **PCA9635_OK** if all is OK, and other error codes otherwise.
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| Error code | Value | Description |
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|:------------------|:-----:|:------------|
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| PCA9635_OK | 0x00 | Everything went well
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| PCA9635_ERROR | 0xFF | Generic error
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| PCA9635_ERR_WRITE | 0xFE | Tries to write more elements than PWM channels
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| PCA9635_ERR_CHAN | 0xFD | Channel out of range
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| PCA9635_ERR_MODE | 0xFC | Invalid mode
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| PCA9635_ERR_REG | 0xFB | Invalid register
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| PCA9635_ERR_I2C | 0xFA | PCA9635 I2C communication error
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## Operation
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See examples
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## Future
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- improve documentation
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- unit tests
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- add examples
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