amiro-lld / source / alld_at42qt1050.c @ ef078306
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| 1 | 9e45662e | Thomas Schöpping | /*
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| 2 | AMiRo-LLD is a compilation of low-level hardware drivers for the Autonomous Mini Robot (AMiRo) platform.
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| 3 | Copyright (C) 2016..2019 Thomas Schöpping et al.
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| 4 | |||
| 5 | This program is free software: you can redistribute it and/or modify
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| 6 | it under the terms of the GNU Lesser General Public License as published by
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| 7 | the Free Software Foundation, either version 3 of the License, or
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| 8 | (at your option) any later version.
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| 9 | |||
| 10 | This program is distributed in the hope that it will be useful,
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 13 | GNU Lesser General Public License for more details.
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| 14 | |||
| 15 | You should have received a copy of the GNU Lesser General Public License
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| 16 | along with this program. If not, see <http://www.gnu.org/licenses/>.
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| 17 | */
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| 18 | |||
| 19 | /**
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| 20 | * @file alld_at42qt1050.c
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| 21 | * @brief Touch sensor function implementations.
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| 22 | *
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| 23 | * @addtogroup lld_touch
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| 24 | * @{
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| 25 | */
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| 26 | |||
| 27 | #include <alld_at42qt1050.h> |
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| 28 | |||
| 29 | #if defined(AMIROLLD_CFG_USE_AT42QT1050) || defined(__DOXYGEN__)
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| 30 | |||
| 31 | #include <math.h> |
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| 32 | |||
| 33 | ef078306 | Thomas Schöpping | /******************************************************************************/
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| 34 | /* LOCAL DEFINITIONS */
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| 35 | /******************************************************************************/
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| 36 | |||
| 37 | /******************************************************************************/
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| 38 | /* EXPORTED VARIABLES */
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| 39 | /******************************************************************************/
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| 40 | |||
| 41 | /******************************************************************************/
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| 42 | /* LOCAL TYPES */
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| 43 | /******************************************************************************/
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| 44 | |||
| 45 | /******************************************************************************/
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| 46 | /* LOCAL VARIABLES */
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| 47 | /******************************************************************************/
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| 48 | |||
| 49 | /******************************************************************************/
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| 50 | /* LOCAL FUNCTIONS */
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| 51 | /******************************************************************************/
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| 52 | |||
| 53 | /******************************************************************************/
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| 54 | /* EXPORTED FUNCTIONS */
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| 55 | /******************************************************************************/
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| 56 | |||
| 57 | 9e45662e | Thomas Schöpping | /**
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| 58 | * @brief Read 8bit data from any register.
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| 59 | *
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| 60 | * @param[in] at42qt1050d The AT42QT1050 driver to use.
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| 61 | * @param[in] reg Register address to read from.
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| 62 | * @param[out] data Pointer to store the register data to.
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| 63 | * @param[in] timeout Timeout for the function to return (in microseconds).
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| 64 | *
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| 65 | * @return Indicator whether the function call was successful or a timeout occurred.
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| 66 | */
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| 67 | inline apalExitStatus_t
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| 68 | at42qt1050_lld_read_reg(const AT42QT1050Driver* at42qt1050d, const at42qt1050_lld_register_t reg, uint8_t* const data, const apalTime_t timeout) |
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| 69 | {
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| 70 | apalDbgAssert(at42qt1050d != NULL && at42qt1050d->i2cd != NULL); |
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| 71 | apalDbgAssert(data != NULL);
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| 72 | |||
| 73 | const uint8_t txbuf = (uint8_t)reg;
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| 74 | return apalI2CMasterTransmit(at42qt1050d->i2cd, at42qt1050d->addr, &txbuf, 1, data, 1, timeout); |
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| 75 | } |
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| 76 | |||
| 77 | /**
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| 78 | * @brief Write 8bit data to any (writable) register.
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| 79 | *
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| 80 | * @param[in] at42qt1050d The AT42QT1050 driver to use.
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| 81 | * @param[in] reg Register address to write to.
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| 82 | * @param[in] data Data to transmit.
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| 83 | * @param[in] timeout Timeout for the function to return (in microseconds).
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| 84 | *
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| 85 | * @return Indicator whether the function call was successful or a timeout occurred.
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| 86 | */
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| 87 | inline apalExitStatus_t
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| 88 | at42qt1050_lld_write_reg(const AT42QT1050Driver* at42qt1050d, const at42qt1050_lld_register_t reg, const uint8_t data, const apalTime_t timeout) |
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| 89 | {
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| 90 | apalDbgAssert(at42qt1050d != NULL && at42qt1050d->i2cd != NULL); |
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| 91 | |||
| 92 | const uint8_t txbuf[2] = { (uint8_t)reg, data }; |
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| 93 | return apalI2CMasterTransmit(at42qt1050d->i2cd, at42qt1050d->addr, txbuf, 2, NULL, 0, timeout); |
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| 94 | } |
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| 95 | |||
| 96 | /**
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| 97 | * @brief Read signal information of a key.
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| 98 | *
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| 99 | * @param[in] at42qt1050d The AT42QT1050 driver to use.
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| 100 | * @param[in] key Key to read the signal information of.
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| 101 | * @param[out] signal Pointer to store the data to.
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| 102 | * @param[in] timeout Timeout for the function to return (in microseconds).
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| 103 | *
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| 104 | * @return Indicator whether the function call was successful or a timeout occurred.
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| 105 | */
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| 106 | inline apalExitStatus_t
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| 107 | at42qt1050_lld_read_keyssignal(const AT42QT1050Driver* at42qt1050d, const uint8_t key, uint16_t* signal, const apalTime_t timeout) |
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| 108 | {
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| 109 | apalDbgAssert(at42qt1050d != NULL && at42qt1050d->i2cd != NULL); |
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| 110 | apalDbgAssert(key < AT42QT1050_LLD_NUM_KEYS); |
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| 111 | apalDbgAssert(signal != NULL);
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| 112 | |||
| 113 | const uint8_t txbuf = AT42QT1050_LLD_REG_KEYSIGNAL_0 + (2*key) + ((key > 1) ? 1 : 0); |
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| 114 | uint8_t rxbuf[2];
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| 115 | const apalExitStatus_t status = apalI2CMasterTransmit(at42qt1050d->i2cd, at42qt1050d->addr, &txbuf, 1, rxbuf, 2, timeout); |
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| 116 | *signal = (rxbuf[0] << 8) | rxbuf[1]; |
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| 117 | return status;
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| 118 | } |
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| 119 | |||
| 120 | /**
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| 121 | * @brief Read reference data of a key.
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| 122 | *
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| 123 | * @param[in] at42qt1050d The AT42QT1050 driver to use.
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| 124 | * @param[in] key Key to read the signal information of.
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| 125 | * @param[out] refdata Pointer to store the data to.
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| 126 | * @param[in] timeout Timeout for the function to return (in microseconds).
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| 127 | *
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| 128 | * @return Indicator whether the function call was successful or a timeout occurred.
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| 129 | */
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| 130 | inline apalExitStatus_t
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| 131 | at42qt1050_lld_read_referencedata(const AT42QT1050Driver* at42qt1050d, const uint8_t key, uint16_t* refdata, const apalTime_t timeout) |
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| 132 | {
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| 133 | apalDbgAssert(at42qt1050d != NULL && at42qt1050d->i2cd != NULL); |
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| 134 | apalDbgAssert(key < AT42QT1050_LLD_NUM_KEYS); |
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| 135 | apalDbgAssert(refdata != NULL);
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| 136 | |||
| 137 | const uint8_t txbuf = AT42QT1050_LLD_REG_REFERENCEDATA_0 + (2*key) + ((key > 1) ? 1 : 0); |
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| 138 | uint8_t rxbuf[2];
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| 139 | const apalExitStatus_t status = apalI2CMasterTransmit(at42qt1050d->i2cd, at42qt1050d->addr, &txbuf, 1, rxbuf, 2, timeout); |
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| 140 | *refdata = (rxbuf[0] << 8) | rxbuf[1]; |
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| 141 | return status;
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| 142 | } |
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| 143 | |||
| 144 | /**
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| 145 | * @brief Convert a 4 bit pulse value to the representing number of samples.
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| 146 | * @details Calculation: <#samples> = 2^(<pulse value>)
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| 147 | *
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| 148 | * @param[in] pulse Pulse value.
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| 149 | *
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| 150 | * @return Resulting sample count.
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| 151 | */
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| 152 | inline uint16_t
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| 153 | at42qt1050_lld_pulse2samples(const uint8_t pulse)
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| 154 | {
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| 155 | apalDbgAssert(pulse <= 0x0Fu);
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| 156 | |||
| 157 | return (1 << pulse); |
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| 158 | } |
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| 159 | |||
| 160 | /**
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| 161 | * @brief Convert a desired number of samples to the according (theoretical) pulse value.
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| 162 | * @details Calculation: <pulse value> = log2(<#samples>)
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| 163 | *
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| 164 | * @param[in] samples Desired number of samples.
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| 165 | *
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| 166 | * @return The (theoretical) value to set to the pulse register.
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| 167 | */
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| 168 | inline float |
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| 169 | at42qt1050_lld_samples2pulse(const uint16_t samples)
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| 170 | {
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| 171 | return log2f(samples);
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| 172 | } |
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| 173 | |||
| 174 | /**
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| 175 | * @brief Convert a 4 bit scale value to the accoring scaling factor.
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| 176 | * @details Calculation: <scaling factor> = 2^(<scale value>)
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| 177 | *
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| 178 | * @param[in] scale Scale value.
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| 179 | *
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| 180 | * @return Resulting scaling factor.
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| 181 | */
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| 182 | inline uint16_t
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| 183 | at42qt1050_lld_scale2scaling(const uint8_t scale)
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| 184 | {
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| 185 | apalDbgAssert(scale <= 0x0Fu);
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| 186 | |||
| 187 | return (1 << scale); |
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| 188 | } |
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| 189 | |||
| 190 | /**
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| 191 | * @brief Convert a desired scaling factor to the according (theoretical) scale value.
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| 192 | * @details Calculation: <scale value> = log2(<scaling factor>
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| 193 | * )
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| 194 | * @param[in] factor Desired scaling factor.
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| 195 | *
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| 196 | * @return The (theoretcial) value to set to the scale register.
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| 197 | */
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| 198 | inline float |
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| 199 | at42qt1050_lld_scaling2scale(const uint16_t factor)
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| 200 | {
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| 201 | return log2f(factor);
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| 202 | } |
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| 203 | |||
| 204 | #endif /* defined(AMIROLLD_CFG_USE_AT42QT1050) */ |
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| 205 | |||
| 206 | /** @} */ |