nRF51 SDK: Synaptics Touchpad driver.

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Synaptics Touchpad driver.
Peripheral Drivers

Synaptics Touchpad driver. More...

## Macros

#define | TOUCHPAD_INT_STATUS 0x14
| Interrupt status register. More...
#define | TOUCHPAD_BUTTON_STATUS 0x41
| Button status register.
#define | TOUCHPAD_FINGER0_REL 0x30
| First register in finger delta block.
#define | TOUCHPAD_GESTURE_FLAGS 0x3A
| Gesture flags 0.
#define | TOUCHPAD_SCROLL 0x3F
| Scroll zone X / horizontal multifinger scroll.
#define | TOUCHPAD_CONTROL 0x42
| Device control register.
#define | TOUCHPAD_COMMAND 0x8F
| Device command register.
#define | TOUCHPAD_RESET 0x54
| Address of reset.
#define | TOUCHPAD_PAGESELECT 0xFF
| Address of page select (can be found in every page at the same address)
#define | TOUCHPAD_PRODUCT_ID 0xA2
| Address of product ID string.

## Enumerations

enum | TouchpadSleepMode_t { SleepmodeNormal = 0x00, SleepmodeSensorSleep = 0x01 }

## Functions

bool | touchpad_init (uint8_t device_address)
| Function for Touchpad initialization. More...
bool | touchpad_reset (void)
| Function for attempting to soft-reset the device. More...
bool | touchpad_interrupt_status_read (uint8_t *interrupt_status)
| Function for reading the interrupt status register of the device. This clears all interrupts. More...
bool | touchpad_set_sleep_mode (TouchpadSleepMode_t mode)
| Function for sleep mode configuration. More...
bool | touchpad_read_register (uint8_t register_address, uint8_t *value)
| Function for reading a touchpad register contents over TWI. More...
bool | touchpad_write_register (uint8_t register_address, uint8_t value)
| Function for writing a touchpad register contents over TWI. More...
bool | touchpad_product_id_read (uint8_t *product_id, uint8_t product_id_bytes)
| Function for writing touchpad register contents over TWI. Writes one or more consecutive registers. More...
bool | touchpad_product_id_verify (void)
| Function for reading and verifying touchpad's product ID. More...

## Detailed Description

Synaptics Touchpad driver.

## Macro Definition Documentation

#define TOUCHPAD_INT_STATUS 0x14

Interrupt status register.

Touchpad register addresses.

## Enumeration Type Documentation

enum TouchpadSleepMode_t

Operational states

Enumerator
SleepmodeNormal | Normal operation.
SleepmodeSensorSleep | Low power operation.

## Function Documentation

bool touchpad_init | ( | uint8_t | device_address | ) |

Function for Touchpad initialization.

Parameters

  device_address | TWI address of the device in bits [6:0]

Return values

  true | Touchpad was successfully identified and initialized
  false | Unexpected product ID or communication failure

bool touchpad_interrupt_status_read | ( | uint8_t * | interrupt_status | ) |

Function for reading the interrupt status register of the device. This clears all interrupts.

Parameters

  interrupt_status | Address to store interrupt status to.

Return values

  true | Register contents read successfully to interrupt_status
  false | Reading failed

bool touchpad_product_id_read | ( | uint8_t * | product_id,
|  | uint8_t | product_id_bytes
| ) |  |

Function for writing touchpad register contents over TWI. Writes one or more consecutive registers.

Parameters

  [out] | product_id | Pointer to a address to store product ID. Memory must be allocated for product_id_bytes number of bytes.
  [in] | product_id_bytes | Number of bytes to read

Return values

  true | Product ID read succeeded
  false | Product ID read failed

bool touchpad_product_id_verify | ( | void |  | ) |

Function for reading and verifying touchpad's product ID.

Return values

  true | Product ID is what was expected
  false | Product ID was not what was expected

bool touchpad_read_register | ( | uint8_t | register_address,
|  | uint8_t * | value
| ) |  |

Function for reading a touchpad register contents over TWI.

Parameters

  [in] | register_address | Register address
  [out] | value | Pointer to a data buffer where read data will be stored

Return values

  true | Register read succeeded
  false | Register read failed

bool touchpad_reset | ( | void |  | ) |

Function for attempting to soft-reset the device.

Return values

  true | Reset succeeded
  false | Reset failed

bool touchpad_set_sleep_mode | ( | TouchpadSleepMode_t | mode | ) |

Function for sleep mode configuration.

Note
  In low power mode the touchpad do not generate interrupts from touch sensing.

Parameters

  [in] | mode | Operational mode

Return values

  true | Sleep mode set successfully
  false | Sleep mode setting failed

bool touchpad_write_register | ( | uint8_t | register_address,
|  | uint8_t | value
| ) |  |

Function for writing a touchpad register contents over TWI.

Parameters

  [in] | register_address | Register address
  [in] | value | Value to write to register

Return values

  true | Register write succeeded
  false | Register write failed