mirror of
https://github.com/RobTillaart/Arduino.git
synced 2024-10-03 18:09:02 -04:00
210 lines
8.3 KiB
Markdown
210 lines
8.3 KiB
Markdown
|
|
[](https://github.com/marketplace/actions/arduino_ci)
|
|
[](https://github.com/RobTillaart/PCA9635/actions/workflows/arduino-lint.yml)
|
|
[](https://github.com/RobTillaart/PCA9635/actions/workflows/jsoncheck.yml)
|
|
[](https://github.com/RobTillaart/PCA9635/blob/master/LICENSE)
|
|
[](https://github.com/RobTillaart/PCA9635/releases)
|
|
|
|
|
|
# PCA9635
|
|
|
|
Arduino library for PCA9635 I2C 8 bit PWM LED driver, 16 channel.
|
|
|
|
|
|
## Description
|
|
|
|
This library is to control the I2C PCA9635 PWM extender.
|
|
The 16 channels are independently configurable in steps of 1/256.
|
|
this allows for better than 1% fine tuning of the duty-cycle
|
|
of the PWM signal.
|
|
|
|
library is related to the 8 channel PCA9634 class.
|
|
(these might merge in the future)
|
|
|
|
|
|
## Interface
|
|
|
|
|
|
### Constructor
|
|
|
|
- **PCA9635(uint8_t deviceAddress, TwoWire \*wire = &Wire)** Constructor with I2C device address,
|
|
and optional the Wire interface as parameter.
|
|
- **bool begin(uint8_t mode1_mask = PCA9634_MODE1_ALLCALL, uint8_t mode2_mask = PCA9634_MODE2_NONE)**
|
|
initializes the library after startup. Optionally setting the MODE1 and MODE2 configuration registers.
|
|
See PCA9635.h and datasheet for settings possible.
|
|
- **bool begin(int sda, int scl, uint8_t mode1_mask = PCA9635_MODE1_ALLCALL, uint8_t mode2_mask = PCA9635_MODE2_NONE)**
|
|
idem, ESP32 ESP8266 only.
|
|
- **void configure(uint8_t mode1_mask, uint8_t mode2_mask)**
|
|
To configure the library after startup one can set the MODE1 and MODE2 configuration registers.
|
|
See PCA9635.h and datasheet for settings possible.
|
|
- **bool isConnected()** checks if address is available on I2C bus.
|
|
- **uint8_t channelCount()** returns the number of channels = 16.
|
|
|
|
|
|
### LedDriverMode
|
|
|
|
Configure LED behaviour.
|
|
|
|
- **uint8_t setLedDriverMode(uint8_t channel, uint8_t mode)** mode is 0..3 See datasheet for full details.
|
|
- **uint8_t getLedDriverMode(uint8_t channel)** returns the current mode of the channel.
|
|
|
|
| LED mode | Value | Description |
|
|
|:-------------------|:-----:|:----------------------------------|
|
|
| PCA9635_LEDOFF | 0x00 | led is 100% off, default @startup |
|
|
| PCA9635_LEDON | 0x01 | led is 100% on. |
|
|
| PCA9635_LEDPWM | 0x02 | set LED in PWM mode, 0..255 |
|
|
| PCA9635_LEDGRPPWM | 0x03 | add LED to the GRPPWM* |
|
|
|
|
\* all LEDs in the group GRPPWM can be set to the same PWM value in one set.
|
|
This is ideal to trigger e.g. multiple LEDs (servo's) at same time.
|
|
|
|
|
|
### Read and write
|
|
|
|
Read and write individual values to LED channels.
|
|
Requires LEDs' DriverMode of the specific channels to be in PWM mode.
|
|
|
|
- **uint8_t write1(uint8_t channel, uint8_t value)** writes a single 8 bit PWM value.
|
|
- **uint8_t write3(uint8_t channel, uint8_t R, uint8_t G, uint8_t B)**
|
|
writes three consecutive PWM registers.
|
|
typical use is to write R, G, B values for a full colour LED.
|
|
- **uint8_t writeN(uint8_t channel, uint8_t \* array, uint8_t count)**
|
|
write count consecutive PWM registers.
|
|
May return **PCA9635_ERR_WRITE** if array has too many elements
|
|
(including channel as offset).
|
|
|
|
|
|
### Mode registers
|
|
|
|
Used to configure the PCA963x general behaviour.
|
|
|
|
- **uint8_t writeMode(uint8_t reg, uint8_t value)** configuration of one of the two configuration registers.
|
|
Check datasheet for details.
|
|
- **uint8_t readMode(uint8_t reg)** reads back the configured mode,
|
|
useful to add or remove a single flag (bit masking).
|
|
- **uint8_t setMode1(uint8_t value)** convenience wrapper.
|
|
- **uint8_t setMode2(uint8_t value)** convenience wrapper.
|
|
- **uint8_t getMode1()** convenience wrapper.
|
|
- **uint8_t getMode2()** convenience wrapper.
|
|
|
|
|
|
#### Constants for mode registers
|
|
|
|
(added 0.3.4)
|
|
|
|
| Name | Value | Description |
|
|
|:------------------------|:-----:|:-----------------------------------|
|
|
| PCA9635_MODE1_AUTOINCR2 | 0x80 | Read Only, 0 = disable 1 = enable |
|
|
| PCA9635_MODE1_AUTOINCR1 | 0x40 | Read Only, bit1 |
|
|
| PCA9635_MODE1_AUTOINCR0 | 0x20 | Read Only, bit0 |
|
|
| PCA9635_MODE1_SLEEP | 0x10 | 0 = normal 1 = sleep |
|
|
| PCA9635_MODE1_SUB1 | 0x08 | 0 = disable 1 = enable |
|
|
| PCA9635_MODE1_SUB2 | 0x04 | 0 = disable 1 = enable |
|
|
| PCA9635_MODE1_SUB3 | 0x02 | 0 = disable 1 = enable |
|
|
| PCA9635_MODE1_ALLCALL | 0x01 | 0 = disable 1 = enable |
|
|
| | | |
|
|
| PCA9635_MODE2_BLINK | 0x20 | 0 = dim 1 = blink |
|
|
| PCA9635_MODE2_INVERT | 0x10 | 0 = normal 1 = inverted |
|
|
| PCA9635_MODE2_STOP | 0x08 | 0 = on STOP 1 = on ACK |
|
|
| PCA9635_MODE2_TOTEMPOLE | 0x04 | 0 = open drain 1 = totem-pole |
|
|
|
|
These constants makes it easier to set modes without using a non descriptive
|
|
bit mask. The constants can be merged by OR-ing them together, see snippet:
|
|
|
|
```cpp
|
|
ledArray.writeMode(PCA9635_MODE2, 0b00110100);
|
|
|
|
// would become
|
|
|
|
uint8_t mode2_mask = PCA9635_MODE2_BLINK | PCA9635_MODE2_INVERT | PCA9635_MODE2_TOTEMPOLE;
|
|
ledArray.writeMode(PCA9635_MODE2, mode2_mask);
|
|
|
|
// or even
|
|
|
|
ledArray.setMode2(PCA9635_MODE2_BLINK | PCA9635_MODE2_INVERT | PCA9635_MODE2_TOTEMPOLE);
|
|
```
|
|
|
|
|
|
### Group PWM and frequency
|
|
|
|
Check datasheet for the details.
|
|
|
|
- **void setGroupPWM(uint8_t value)** sets all channels that are part of the PWM group to value.
|
|
- **uint8_t getGroupPWM()** get the current PWM setting of the group.
|
|
- **void setGroupFREQ(uint8_t value)** is used for blinking the group of configured LED.
|
|
Value goes from 0 to 255 with each step representing an increase of approx. 41 ms.
|
|
So 0x00 results in 41 ms blinking period (on AND off) and 0xFF in approx. 10.5 s.
|
|
- **uint8_t getGroupFREQ()** returns the set frequency of the PWM group.
|
|
|
|
|
|
### Miscellaneous
|
|
|
|
- **int lastError()** returns **PCA9635_OK** if all is OK, and other error codes otherwise.
|
|
|
|
| Error code | Value | Description |
|
|
|:------------------|:-----:|:---------------------|
|
|
| PCA9635_OK | 0x00 | Everything went well
|
|
| PCA9635_ERROR | 0xFF | Generic error
|
|
| PCA9635_ERR_WRITE | 0xFE | Tries to write more elements than PWM channels
|
|
| PCA9635_ERR_CHAN | 0xFD | Channel out of range
|
|
| PCA9635_ERR_MODE | 0xFC | Invalid mode
|
|
| PCA9635_ERR_REG | 0xFB | Invalid register
|
|
| PCA9635_ERR_I2C | 0xFA | I2C communication error
|
|
|
|
|
|
### SUB CALL and ALL CALL
|
|
|
|
Please read the datasheet to understand the working of **SUB CALL** and **ALL CALL**.
|
|
|
|
Since version 0.4.0 there is (experimental) support for the **SUB CALL** and **ALL CALL** functions.
|
|
It needs more testing and if there are issues, please report.
|
|
|
|
AllCall is automatically activated for each device on startup.
|
|
|
|
|
|
#### Description
|
|
|
|
**SUB CALL** allows one to make groups of PCA9634 devices and control them on group level.
|
|
The number of groups one can make depends on free I2C addresses on one I2C bus.
|
|
Using multiple I2C buses or multiplexers will even increase the possible number.
|
|
Every PCA9634 device can be member of up to three of these groups.
|
|
To become member one needs to set the **setSubCallAddress(nr, address)** and enable
|
|
it with **enableSubCall(nr)**.
|
|
|
|
In the same way one can become member of an **ALL CALL** group.
|
|
Typically there is only one such group but one can configure more of them by applying different addresses.
|
|
|
|
|
|
#### Interface
|
|
|
|
The functions to enable all/sub-addresses are straightforward:
|
|
|
|
- **bool enableSubCall(uint8_t nr)** nr = 1,2,3
|
|
- **bool disableSubCall(uint8_t nr)** nr = 1,2,3
|
|
- **bool isEnabledSubCall(uint8_t nr)** nr = 1,2,3
|
|
- **bool setSubCallAddress(uint8_t nr, uint8_t address)**
|
|
- **uint8_t getSubCallAddress(uint8_t nr)**
|
|
|
|
- **bool enableAllCall()**
|
|
- **bool disableAllCall()**
|
|
- **bool isEnabledAllCall()**
|
|
- **bool setAllCallAddress(uint8_t address)**
|
|
- **uint8_t getAllCallAddress()**
|
|
|
|
|
|
## Operation
|
|
|
|
See examples
|
|
|
|
|
|
## Future
|
|
|
|
- improve documentation
|
|
- unit tests
|
|
- SUB CALL if possible?
|
|
- ALL CALL if possible?
|
|
- add examples
|
|
- sync with PCA9634 developments
|
|
- merge with PCA9634 and a PCA963X base class if possible
|
|
|