AMiRo-OS

/*

AMiRo-LLD is a compilation of low-level hardware drivers for the Autonomous Mini Robot (AMiRo) platform.

Copyright (C) 2016..2019  Thomas Schöpping et al.

This program is free software: you can redistribute it and/or modify

it under the terms of the GNU Lesser General Public License as published by

the Free Software Foundation, either version 3 of the License, or

(at your option) any later version.

This program is distributed in the hope that it will be useful,

but WITHOUT ANY WARRANTY; without even the implied warranty of

MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License

along with this program.  If not, see <http://www.gnu.org/licenses/>.

*/

/**

 * @file    alld_at42qt1050.c

 * @brief   Touch sensor function implementations.

 *

 * @addtogroup lld_touch

 * @{

 */

#include <alld_at42qt1050.h>

#if defined(AMIROLLD_CFG_USE_AT42QT1050) || defined(__DOXYGEN__)

#include <math.h>

/**

 * @brief   Read 8bit data from any register.

 *

 * @param[in]   at42qt1050d   The AT42QT1050 driver to use.

 * @param[in]   reg           Register address to read from.

 * @param[out]  data          Pointer to store the register data to.

 * @param[in]   timeout       Timeout for the function to return (in microseconds).

 *

 * @return    Indicator whether the function call was successful or a timeout occurred.

 */

inline apalExitStatus_t

at42qt1050_lld_read_reg(const AT42QT1050Driver* at42qt1050d, const at42qt1050_lld_register_t reg, uint8_t* const data, const apalTime_t timeout)

{

  apalDbgAssert(at42qt1050d != NULL && at42qt1050d->i2cd != NULL);

  apalDbgAssert(data != NULL);

  const uint8_t txbuf = (uint8_t)reg;

  return apalI2CMasterTransmit(at42qt1050d->i2cd, at42qt1050d->addr, &txbuf, 1, data, 1, timeout);

}

/**

 * @brief   Write 8bit data to any (writable) register.

 *

 * @param[in]   at42qt1050d   The AT42QT1050 driver to use.

 * @param[in]   reg           Register address to write to.

 * @param[in]   data          Data to transmit.

 * @param[in]   timeout       Timeout for the function to return (in microseconds).

 *

 * @return    Indicator whether the function call was successful or a timeout occurred.

 */

inline apalExitStatus_t

at42qt1050_lld_write_reg(const AT42QT1050Driver* at42qt1050d, const at42qt1050_lld_register_t reg, const uint8_t data, const apalTime_t timeout)

{

  apalDbgAssert(at42qt1050d != NULL && at42qt1050d->i2cd != NULL);

  const uint8_t txbuf[2] = { (uint8_t)reg, data };

  return apalI2CMasterTransmit(at42qt1050d->i2cd, at42qt1050d->addr, txbuf, 2, NULL, 0, timeout);

}

/**

 * @brief   Read signal information of a key.

 *

 * @param[in]   at42qt1050d   The AT42QT1050 driver to use.

 * @param[in]   key           Key to read the signal information of.

 * @param[out]  signal        Pointer to store the data to.

 * @param[in]   timeout       Timeout for the function to return (in microseconds).

 *

 * @return    Indicator whether the function call was successful or a timeout occurred.

 */

inline apalExitStatus_t

at42qt1050_lld_read_keyssignal(const AT42QT1050Driver* at42qt1050d, const uint8_t key, uint16_t* signal, const apalTime_t timeout)

{

  apalDbgAssert(at42qt1050d != NULL && at42qt1050d->i2cd != NULL);

  apalDbgAssert(key < AT42QT1050_LLD_NUM_KEYS);

  apalDbgAssert(signal != NULL);

  const uint8_t txbuf = AT42QT1050_LLD_REG_KEYSIGNAL_0 + (2*key) + ((key > 1) ? 1 : 0);

  uint8_t rxbuf[2];

  const apalExitStatus_t status = apalI2CMasterTransmit(at42qt1050d->i2cd, at42qt1050d->addr, &txbuf, 1, rxbuf, 2, timeout);

  *signal = (rxbuf[0] << 8) | rxbuf[1];

  return status;

}

/**

 * @brief   Read reference data of a key.

 *

 * @param[in]   at42qt1050d   The AT42QT1050 driver to use.

 * @param[in]   key           Key to read the signal information of.

 * @param[out]  refdata       Pointer to store the data to.

 * @param[in]   timeout       Timeout for the function to return (in microseconds).

 *

 * @return    Indicator whether the function call was successful or a timeout occurred.

 */

inline apalExitStatus_t

at42qt1050_lld_read_referencedata(const AT42QT1050Driver* at42qt1050d, const uint8_t key, uint16_t* refdata, const apalTime_t timeout)

{

  apalDbgAssert(at42qt1050d != NULL && at42qt1050d->i2cd != NULL);

  apalDbgAssert(key < AT42QT1050_LLD_NUM_KEYS);

  apalDbgAssert(refdata != NULL);

  const uint8_t txbuf = AT42QT1050_LLD_REG_REFERENCEDATA_0 + (2*key) + ((key > 1) ? 1 : 0);

  uint8_t rxbuf[2];

  const apalExitStatus_t status = apalI2CMasterTransmit(at42qt1050d->i2cd, at42qt1050d->addr, &txbuf, 1, rxbuf, 2, timeout);

  *refdata = (rxbuf[0] << 8) | rxbuf[1];

  return status;

}

/**

 * @brief   Convert a 4 bit pulse value to the representing number of samples.

 * @details Calculation: <#samples> = 2^(<pulse value>)

 *

 * @param[in]   pulse   Pulse value.

 *

 * @return    Resulting sample count.

 */

inline uint16_t

at42qt1050_lld_pulse2samples(const uint8_t pulse)

{

  apalDbgAssert(pulse <= 0x0Fu);

  return (1 << pulse);

}

/**

 * @brief   Convert a desired number of samples to the according (theoretical) pulse value.

 * @details Calculation: <pulse value> = log2(<#samples>)

 *

 * @param[in]   samples   Desired number of samples.

 *

 * @return    The (theoretical) value to set to the pulse register.

 */

inline float

at42qt1050_lld_samples2pulse(const uint16_t samples)

{

  return log2f(samples);

}

/**

 * @brief   Convert a 4 bit scale value to the accoring scaling factor.

 * @details Calculation: <scaling factor> = 2^(<scale value>)

 *

 * @param[in]   scale   Scale value.

 *

 * @return    Resulting scaling factor.

 */

inline uint16_t

at42qt1050_lld_scale2scaling(const uint8_t scale)

{

  apalDbgAssert(scale <= 0x0Fu);

  return (1 << scale);

}

/**

 * @brief   Convert a desired scaling factor to the according (theoretical) scale value.

 * @details Calculation: <scale value> = log2(<scaling factor>

 * )

 * @param[in]   factor    Desired scaling factor.

 *

 * @return    The (theoretcial) value to set to the scale register.

 */

inline float

at42qt1050_lld_scaling2scale(const uint16_t factor)

{

  return log2f(factor);

}

#endif /* defined(AMIROLLD_CFG_USE_AT42QT1050) */

/** @} */