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236 lines
9.2 KiB
Markdown
236 lines
9.2 KiB
Markdown
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[](https://github.com/marketplace/actions/arduino_ci)
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[](https://github.com/RobTillaart/PCA9634/actions/workflows/arduino-lint.yml)
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[](https://github.com/RobTillaart/PCA9634/actions/workflows/jsoncheck.yml)
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[](https://github.com/RobTillaart/PCA9634/blob/master/LICENSE)
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[](https://github.com/RobTillaart/PCA9634/releases)
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# PCA9634
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Arduino library for PCA9634 I2C 8 bit PWM LED driver, 8 channel.
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## Description
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This library is to control the I2C PCA9634 PWM extender.
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The 8 channels are independently configurable in 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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library is a 8 channel derived variation of the PCA9635 class.
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(these might merge in the future)
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## Interface
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### Constructor
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- **PCA9634(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(uint8_t mode1_mask = PCA9634_MODE1_ALLCALL, uint8_t mode2_mask = PCA9634_MODE2_NONE)**
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initializes the library after startup. Optionally setting the MODE1 and MODE2 configuration registers.
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See PCA9634.h and datasheet for settings possible.
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- **bool begin(uint8_t sda, uint8_t scl, uint8_t mode1_mask = PCA9634_MODE1_ALLCALL, uint8_t mode2_mask = PCA9634_MODE2_NONE)**
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idem, ESP32 ESP8266 only.
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- **void configure(uint8_t mode1_mask, uint8_t mode2_mask)**
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To configure the library after startup one can set the MODE1 and MODE2 configuration registers.
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See PCA9634.h and datasheet for settings possible.
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- **bool isConnected()** checks if address is available on I2C bus.
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- **uint8_t channelCount()** returns the number of channels = 8.
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### LedDriverMode
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Configure LED behaviour.
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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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| PCA9634_LEDOFF | 0x00 | led is 100% off, default @startup |
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| PCA9634_LEDON | 0x01 | led is 100% on. |
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| PCA9634_LEDPWM | 0x02 | set LED in PWM mode, 0..255 |
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| PCA9634_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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Read and write individual values to LED channels.
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Requires LEDs' DriverMode of the specific channels to be in PWM mode.
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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)**
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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)**
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write count consecutive PWM registers.
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May return **PCA9634_ERR_WRITE** if array has too many elements
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(including channel as offset).
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### Mode registers
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Used to configure the PCA963x general behaviour.
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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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- **uint8_t setMode1(uint8_t value)** convenience wrapper.
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- **uint8_t setMode2(uint8_t value)** convenience wrapper.
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- **uint8_t getMode1()** convenience wrapper.
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- **uint8_t getMode2()** convenience wrapper.
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#### Constants for mode registers
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(added 0.1.2)
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| Name | Value | Description |
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|:------------------------|:-----:|:-----------------------------------|
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| PCA9634_MODE1_AUTOINCR2 | 0x80 | Read Only, 0 = disable 1 = enable |
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| PCA9634_MODE1_AUTOINCR1 | 0x40 | Read Only, bit1 |
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| PCA9634_MODE1_AUTOINCR0 | 0x20 | Read Only, bit0 |
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| PCA9634_MODE1_SLEEP | 0x10 | 0 = normal 1 = sleep |
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| PCA9634_MODE1_SUB1 | 0x08 | 0 = disable 1 = enable |
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| PCA9634_MODE1_SUB2 | 0x04 | 0 = disable 1 = enable |
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| PCA9634_MODE1_SUB3 | 0x02 | 0 = disable 1 = enable |
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| PCA9634_MODE1_ALLCALL | 0x01 | 0 = disable 1 = enable |
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| PCA9634_MODE1_NONE | 0x00 | |
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| | | |
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| PCA9634_MODE2_BLINK | 0x20 | 0 = dim 1 = blink |
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| PCA9634_MODE2_INVERT | 0x10 | 0 = normal 1 = inverted |
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| PCA9634_MODE2_STOP | 0x08 | 0 = on STOP 1 = on ACK |
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| PCA9634_MODE2_TOTEMPOLE | 0x04 | 0 = open drain 1 = totem-pole |
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| PCA9634_MODE2_NONE | 0x00 | |
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These constants makes it easier to set modes without using a non descriptive
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bit mask. The constants can be merged by OR-ing them together, see snippet:
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```cpp
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ledArray.writeMode(PCA9634_MODE2, 0b00110100);
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// would become
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uint8_t mode2_mask = PCA9634_MODE2_BLINK | PCA9634_MODE2_INVERT | PCA9634_MODE2_TOTEMPOLE;
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ledArray.writeMode(PCA9634_MODE2, mode2_mask);
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// or even
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ledArray.setMode2(PCA9634_MODE2_BLINK | PCA9634_MODE2_INVERT | PCA9634_MODE2_TOTEMPOLE);
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```
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### Group PWM and frequency
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Check datasheet for the details.
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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(uint8_t value)** is used for blinking the group of configured LED.
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Value goes from 0 to 255 with each step representing an increase of approx. 41 ms.
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So 0x00 results in 41 ms blinking period (on AND off) and 0xFF in approx. 10.5 s.
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- **uint8_t getGroupFREQ()** returns the set frequency of the PWM group.
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### Miscellaneous
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- **int lastError()** returns **PCA9634_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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| PCA9634_OK | 0x00 | Everything went well
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| PCA9634_ERROR | 0xFF | Generic error
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| PCA9634_ERR_WRITE | 0xFE | Tries to write more elements than PWM channels
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| PCA9634_ERR_CHAN | 0xFD | Channel out of range
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| PCA9634_ERR_MODE | 0xFC | Invalid mode
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| PCA9634_ERR_REG | 0xFB | Invalid register
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| PCA9634_ERR_I2C | 0xFA | I2C communication error
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### SUB CALL and ALL CALL
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Please read the datasheet to understand the working of **SUB CALL** and **ALL CALL**.
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Since version 0.2.0 there is (experimental) support for the **SUB CALL** and **ALL CALL** functions.
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It needs more testing and if there are issues, please report.
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AllCall is automatically activated for each device on startup.
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#### Description
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**SUB CALL** allows one to make groups of PCA9634 devices and control them on group level.
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The number of groups one can make depends on free I2C addresses on one I2C bus.
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Using multiple I2C buses or multiplexers will even increase the possible number.
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Every PCA9634 device can be member of up to three of these groups.
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To become member one needs to set the **setSubCallAddress(nr, address)** and enable
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it with **enableSubCall(nr)**.
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In the same way one can become member of an **ALL CALL** group.
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Typically there is only one such group but one can configure more of them by applying different addresses.
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#### Interface
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The functions to enable all/sub-addresses are straightforward:
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- **bool enableSubCall(uint8_t nr)** nr = 1,2,3
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- **bool disableSubCall(uint8_t nr)** nr = 1,2,3
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- **bool isEnabledSubCall(uint8_t nr)** nr = 1,2,3
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- **bool setSubCallAddress(uint8_t nr, uint8_t address)**
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- **uint8_t getSubCallAddress(uint8_t nr)**
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- **bool enableAllCall()**
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- **bool disableAllCall()**
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- **bool isEnabledAllCall()**
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- **bool setAllCallAddress(uint8_t address)**
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- **uint8_t getAllCallAddress()**
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### I2C Software reset
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#### 0.2.2 experimental
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The goal of the i2C software reset is to reset ALL PCA9634 (and compatible)
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devices on the I2C bus. But....
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Since version 0.2.2 the PCA9634 library supports a I2C software reset.
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However the documentation about the I2C software reset is ambiguous.
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Different sources tell about different commands to execute.
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The implementation is a function with the two described methods.
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- method 1 is the PCA9634 specific reset.
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- method 0 is the NXP described reset.
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Note: side effect of this function can be that all devices on the I2C bus
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that support the software reset will reset themselves.
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See - https://github.com/RobTillaart/PCA9634/issues/10#issuecomment-1206326417
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Feedback and experiences with this function is welcome.
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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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- SUB CALL if possible?
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- ALL CALL if possible?
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- add examples
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- sync with PCA9635 developments
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- merge with PCA9635 and a PCA963X base class if possible
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