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modm::pca9685< I2cMaster > Class Template Reference
External Device Drivers » PCA9685 12-bit PWM Driver

#include <modm/driver/pwm/pca9685.hpp>

Inheritance diagram for modm::pca9685< I2cMaster >:
modm::I2cDevice< I2cMaster, 1, I2cWriteTransaction > modm::NestedResumable< 10+1 >

Public Types

enum  Register {
  REG_MODE1 = 0x00, REG_MODE2 = 0x01, REG_SUBADR1 = 0x02, REG_SUBADR2 = 0x03,
  REG_SUBADR3 = 0x04, REG_ALLCALLADR = 0x05, REG_LED0_ON_L = 0x06, REG_LED0_ON_H = 0x07,
  REG_LED0_OFF_L = 0x08, REG_LED0_OFF_H = 0x09, REG_LED1_ON_L = 0x0a, REG_LED1_ON_H = 0x0b,
  REG_LED1_OFF_L = 0x0c, REG_LED1_OFF_H = 0x0d, REG_LED2_ON_L = 0x0e, REG_LED2_ON_H = 0x0f,
  REG_LED2_OFF_L = 0x10, REG_LED2_OFF_H = 0x11, REG_LED3_ON_L = 0x12, REG_LED3_ON_H = 0x13,
  REG_LED3_OFF_L = 0x14, REG_LED3_OFF_H = 0x15, REG_LED4_ON_L = 0x16, REG_LED4_ON_H = 0x17,
  REG_LED4_OFF_L = 0x18, REG_LED4_OFF_H = 0x19, REG_LED5_ON_L = 0x1a, REG_LED5_ON_H = 0x1b,
  REG_LED5_OFF_L = 0x1c, REG_LED5_OFF_H = 0x1d, REG_LED6_ON_L = 0x1e, REG_LED6_ON_H = 0x1f,
  REG_LED6_OFF_L = 0x20, REG_LED6_OFF_H = 0x21, REG_LED7_ON_L = 0x22, REG_LED7_ON_H = 0x23,
  REG_LED7_OFF_L = 0x24, REG_LED7_OFF_H = 0x25, REG_LED8_ON_L = 0x26, REG_LED8_ON_H = 0x27,
  REG_LED8_OFF_L = 0x28, REG_LED8_OFF_H = 0x29, REG_LED9_ON_L = 0x2a, REG_LED9_ON_H = 0x2b,
  REG_LED9_OFF_L = 0x2c, REG_LED9_OFF_H = 0x2d, REG_LED10_ON_L = 0x2e, REG_LED10_ON_H = 0x2f,
  REG_LED10_OFF_L = 0x30, REG_LED10_OFF_H = 0x31, REG_LED11_ON_L = 0x32, REG_LED11_ON_H = 0x33,
  REG_LED11_OFF_L = 0x34, REG_LED11_OFF_H = 0x35, REG_LED12_ON_L = 0x36, REG_LED12_ON_H = 0x37,
  REG_LED12_OFF_L = 0x38, REG_LED12_OFF_H = 0x39, REG_LED13_ON_L = 0x3a, REG_LED13_ON_H = 0x3b,
  REG_LED13_OFF_L = 0x3c, REG_LED13_OFF_H = 0x3d, REG_LED14_ON_L = 0x3e, REG_LED14_ON_H = 0x3f,
  REG_LED14_OFF_L = 0x40, REG_LED14_OFF_H = 0x41, REG_LED15_ON_L = 0x42, REG_LED15_ON_H = 0x43,
  REG_LED15_OFF_L = 0x44, REG_LED15_OFF_H = 0x45, REG_ALL_LED_ON_L = 0xfa, REG_ALL_LED_ON_H = 0xfb,
  REG_ALL_LED_OFF_L = 0xfc, REG_ALL_LED_OFF_H = 0xfd, REG_PRE_SCALE = 0xfe, REG_TestMode = 0xfe
}
 
enum  Mode1 {
  MODE1_RESTART = 0x80, MODE1_EXTCLK = 0x40, MODE1_AI = 0x20, MODE1_SLEEP = 0x10,
  MODE1_SUB1 = 0x08, MODE1_SUB2 = 0x04, MODE1_SUB3 = 0x02, MODE1_ALLCALL = 0x01
}
 
enum  Mode2 {
  MODE2_INVRT = 0x10, MODE2_OCH = 0x08, MODE2_OUTDRV = 0x04, MODE2_OUTNE1 = 0x02,
  MODE2_OUTNE0 = 0x01
}
 

Public Member Functions

 Pca9685 (uint8_t address)
 
modm::ResumableResult< bool > initialize (uint8_t mode1=0, uint8_t mode2=0)
 
modm::ResumableResult< bool > setChannel (uint8_t channel, uint16_t value)
 
modm::ResumableResult< bool > setAllChannels (uint16_t value)
 
void attachConfigurationHandler (I2c::ConfigurationHandler handler)
 
modm::ResumableResult< bool > ping ()
 
modm::ResumableResult< bool > read (uint8_t *buffer, std::size_t size)
 Starts a write transaction and waits until finished.
 
void setAddress (uint8_t address)
 
modm::ResumableResult< bool > write (const uint8_t *buffer, std::size_t size)
 Starts a write transaction and waits until finished.
 
modm::ResumableResult< bool > writeRead (const uint8_t *writeBuffer, std::size_t writeSize, uint8_t *readBuffer, std::size_t readSize)
 Starts a write-read transaction and waits until finished.
 

Protected Member Functions

int8_t getResumableDepth () const
 
bool isResumableRunning () const
 
bool isTransactionRunning ()
 
modm::ResumableResult< bool > runTransaction ()
 Starts our own transaction and waits until finished.
 
bool startRead (uint8_t *buffer, std::size_t size)
 Configures the transaction with a read operation and starts it.
 
bool startTransaction ()
 Starts the transaction with our own transaction object.
 
bool startTransaction (modm::I2cTransaction *transaction)
 Starts the transaction with a separate transaction object.
 
bool startWrite (const uint8_t *buffer, std::size_t size)
 Configures the transaction with a write operation and starts it.
 
bool startWriteRead (const uint8_t *writeBuffer, std::size_t writeSize, uint8_t *readBuffer, std::size_t readSize)
 Configures the transaction with a write/read operation and starts it.
 
void stopResumable ()
 
bool wasTransactionSuccessful ()
 

Protected Attributes

I2cWriteTransaction transaction
 

Detailed Description

template<typename I2cMaster>
class modm::pca9685< I2cMaster >

PCA9685 16-channel, 12-bit PWM LED controller, I2C-bus

This class allows for basic (and for most use cases sufficient) control of a PCA9685. It implements initialization (setting of MODE1 and MODE2 registers), writing values for single channels, and writing a value for all channels.

This driver has the following limitations:

  • no register read access
  • no arbitrary register write access
  • no address reconfiguration
  • registers LED*_ON_* are fixed at 0
Template Parameters
I2cMasterI2C interface
Author
Christian Menard

Member Function Documentation

void modm::I2cDevice< I2cMaster, 10 , I2cWriteTransaction >::attachConfigurationHandler ( I2c::ConfigurationHandler  handler)
inheritedinline

Attaches a configuration handler, which is called before a transaction, whenever the configuration has to be changed.

template<typename I2cMaster >
modm::ResumableResult<bool> modm::pca9685< I2cMaster >::initialize ( uint8_t  mode1 = 0,
uint8_t  mode2 = 0 
)

Initialize the device.

Note: The bit AI (Auto Increment) in MODE2 register will always be set as it is essential for correct operation of this driver.

Parameters
mode1value to be written to MODE1 register
mode2value to be written to MODE2 register
bool modm::I2cDevice< I2cMaster, 10 , I2cWriteTransaction >::isTransactionRunning ( )
inheritedinlineprotected
Returns
true when transaction is busy.
template<typename I2cMaster >
modm::pca9685< I2cMaster >::Pca9685 ( uint8_t  address)

Constructor.

Parameters
addressI2C address
modm::ResumableResult<bool> modm::I2cDevice< I2cMaster, 10 , I2cWriteTransaction >::ping ( )
inheritedinline
Return Values
truedevice responds to address
falseno device with address found
void modm::I2cDevice< I2cMaster, 10 , I2cWriteTransaction >::setAddress ( uint8_t  address)
inheritedinline

Sets a new address of the slave device.

Parameters
addressthe slave address not yet shifted left (address < 128).
template<typename I2cMaster >
modm::ResumableResult<bool> modm::pca9685< I2cMaster >::setAllChannels ( uint16_t  value)

Set all 16 12-bit PWM channels to the same value.

The upper 4 bits of value are masked out to ensure that always a 12-bit value is written.

Parameters
value12-bit PWM value to be written
template<typename I2cMaster >
modm::ResumableResult<bool> modm::pca9685< I2cMaster >::setChannel ( uint8_t  channel,
uint16_t  value 
)

Set the 12-bit PWM value of a single channel.

Checks if the specified channel is valid (return false otherwise) and masks out the upper 4 bits of value to ensure that always a 12-bit value is written.

Parameters
channelone of the 16 channels (0-15)
value12-bit PWM value to be written
bool modm::I2cDevice< I2cMaster, 10 , I2cWriteTransaction >::wasTransactionSuccessful ( )
inheritedinlineprotected
Returns
true when transaction did not return an error.
The documentation for this class was generated from the following file: