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Diffstat (limited to 'os/ex/gyroscope/ST/l3gd20.c')
| -rw-r--r-- | os/ex/gyroscope/ST/l3gd20.c | 361 |
1 files changed, 361 insertions, 0 deletions
diff --git a/os/ex/gyroscope/ST/l3gd20.c b/os/ex/gyroscope/ST/l3gd20.c new file mode 100644 index 000000000..a7be3347d --- /dev/null +++ b/os/ex/gyroscope/ST/l3gd20.c @@ -0,0 +1,361 @@ +/* + ChibiOS - Copyright (C) 2016 Rocco Marco Guglielmi + + This file is part of ChibiOS. + + ChibiOS is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + ChibiOS 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 General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. + +*/ + +/** + * @file l3gd20.c + * @brief L3GD20 MEMS interface module code. + * + * @addtogroup l3gd20 + * @{ + */ + +#include "ch.h" +#include "hal.h" + +#include "l3gd20.h" + +/*===========================================================================*/ +/* Driver local definitions. */ +/*===========================================================================*/ + +#define L3GD20_SENS_250DPS ((float)0.00875f) +#define L3GD20_SENS_500DPS ((float)0.01750f) +#define L3GD20_SENS_2000DPS ((float)0.07000f) + +#define L3GD20_DI ((uint8_t)0xFF) +#define L3GD20_DI_0 ((uint8_t)0x01) +#define L3GD20_DI_1 ((uint8_t)0x02) +#define L3GD20_DI_2 ((uint8_t)0x04) +#define L3GD20_DI_3 ((uint8_t)0x08) +#define L3GD20_DI_4 ((uint8_t)0x10) +#define L3GD20_DI_5 ((uint8_t)0x20) +#define L3GD20_DI_6 ((uint8_t)0x40) +#define L3GD20_DI_7 ((uint8_t)0x80) + +#define L3GD20_AD ((uint8_t)0x3F) +#define L3GD20_AD_0 ((uint8_t)0x01) +#define L3GD20_AD_1 ((uint8_t)0x02) +#define L3GD20_AD_2 ((uint8_t)0x04) +#define L3GD20_AD_3 ((uint8_t)0x08) +#define L3GD20_AD_4 ((uint8_t)0x10) +#define L3GD20_AD_5 ((uint8_t)0x20) + +#define L3GD20_MS ((uint8_t)0x40) +#define L3GD20_RW ((uint8_t)0x80) + +#define L3GD20_AD_WHO_AM_I ((uint8_t)0x0F) +#define L3GD20_AD_CTRL_REG1 ((uint8_t)0x20) +#define L3GD20_AD_CTRL_REG2 ((uint8_t)0x21) +#define L3GD20_AD_CTRL_REG3 ((uint8_t)0x22) +#define L3GD20_AD_CTRL_REG4 ((uint8_t)0x23) +#define L3GD20_AD_CTRL_REG5 ((uint8_t)0x24) +#define L3GD20_AD_REFERENCE ((uint8_t)0x25) +#define L3GD20_AD_OUT_TEMP ((uint8_t)0x26) +#define L3GD20_AD_STATUS_REG ((uint8_t)0x27) +#define L3GD20_AD_OUT_X_L ((uint8_t)0x28) +#define L3GD20_AD_OUT_X_H ((uint8_t)0x29) +#define L3GD20_AD_OUT_Y_L ((uint8_t)0x2A) +#define L3GD20_AD_OUT_Y_H ((uint8_t)0x2B) +#define L3GD20_AD_OUT_Z_L ((uint8_t)0x2C) +#define L3GD20_AD_OUT_Z_H ((uint8_t)0x2D) +#define L3GD20_AD_FIFO_CTRL_REG ((uint8_t)0x2E) +#define L3GD20_AD_FIFO_SRC_REG ((uint8_t)0x2F) +#define L3GD20_AD_INT1_CFG ((uint8_t)0x30) +#define L3GD20_AD_INT1_SRC ((uint8_t)0x31) +#define L3GD20_AD_INT1_TSH_XH ((uint8_t)0x32) +#define L3GD20_AD_INT1_TSH_XL ((uint8_t)0x33) +#define L3GD20_AD_INT1_TSH_YH ((uint8_t)0x34) +#define L3GD20_AD_INT1_TSH_YL ((uint8_t)0x35) +#define L3GD20_AD_INT1_TSH_ZH ((uint8_t)0x36) +#define L3GD20_AD_INT1_TSH_ZL ((uint8_t)0x37) +#define L3GD20_AD_INT1_DURATION ((uint8_t)0x38) + +#define L3GD20_CTRL_REG4_FS ((uint8_t)0x30) + +/*===========================================================================*/ +/* Driver exported variables. */ +/*===========================================================================*/ + +/*===========================================================================*/ +/* Driver local variables and types. */ +/*===========================================================================*/ + +/** + * @brief L3GD20 Power Mode + */ +typedef enum { + L3GD20_PM_POWER_DOWN = 0x00, + L3GD20_PM_SLEEP_NORMAL = 0x08 +}l3gd20_pm_t; + +/*===========================================================================*/ +/* Driver local functions. */ +/*===========================================================================*/ + +#if (L3GD20_USE_SPI) || defined(__DOXYGEN__) +/** + * @brief Reads a generic register value using SPI. + * @pre The SPI interface must be initialized and the driver started. + * + * @param[in] spip pointer to the SPI interface + * @param[in] reg register number + * @return register value. + */ +static uint8_t l3gd20SPIReadRegister(SPIDriver *spip, uint8_t reg) { + uint8_t txbuf[2] = {L3GD20_RW | reg, 0xFF}; + uint8_t rxbuf[2] = {0x00, 0x00}; + spiSelect(spip); + spiExchange(spip, 2, txbuf, rxbuf); + spiUnselect(spip); + return rxbuf[1]; +} + +/** + * @brief Writes a value into a generic register using SPI. + * @pre The SPI interface must be initialized and the driver started. + * + * @param[in] spip pointer to the SPI interface + * @param[in] reg register number + * @param[in] value register value. + */ +static void l3gd20SPIWriteRegister(SPIDriver *spip, uint8_t reg, + uint8_t value) { + + switch (reg) { + default: + /* Reserved register must not be written, according to the datasheet + * this could permanently damage the device. + */ + osalDbgAssert(FALSE, "l3gd20SPIWriteRegister(), reserved register"); + case L3GD20_AD_WHO_AM_I: + case L3GD20_AD_OUT_TEMP : + case L3GD20_AD_STATUS_REG: + case L3GD20_AD_OUT_X_L: + case L3GD20_AD_OUT_X_H: + case L3GD20_AD_OUT_Y_L: + case L3GD20_AD_OUT_Y_H: + case L3GD20_AD_OUT_Z_L: + case L3GD20_AD_OUT_Z_H: + case L3GD20_AD_FIFO_SRC_REG: + case L3GD20_AD_INT1_SRC: + /* Read only registers cannot be written, the command is ignored.*/ + return; + case L3GD20_AD_CTRL_REG1: + case L3GD20_AD_CTRL_REG2: + case L3GD20_AD_CTRL_REG3: + case L3GD20_AD_CTRL_REG4: + case L3GD20_AD_CTRL_REG5: + case L3GD20_AD_REFERENCE: + case L3GD20_AD_FIFO_CTRL_REG: + case L3GD20_AD_INT1_CFG: + case L3GD20_AD_INT1_TSH_XH: + case L3GD20_AD_INT1_TSH_XL: + case L3GD20_AD_INT1_TSH_YH: + case L3GD20_AD_INT1_TSH_YL: + case L3GD20_AD_INT1_TSH_ZH: + case L3GD20_AD_INT1_TSH_ZL: + case L3GD20_AD_INT1_DURATION: + spiSelect(spip); + uint8_t txbuf[2] = {reg, value}; + spiSend(spip, 2, txbuf); + spiUnselect(spip); + } +} +#endif /* L3GD20_USE_SPI */ + +/* + * Interface implementation. + */ + +static size_t get_axes_number(void *ip) { + + (void) ip; + return L3GD20_NUMBER_OF_AXES; +} + +static msg_t read_raw(void *ip, int32_t axes[L3GD20_NUMBER_OF_AXES]) { + +#if L3GD20_USE_SPI + osalDbgAssert((((L3GD20Driver *)ip)->config->spip->state == SPI_READY), + "read_raw(), channel not ready"); + spiAcquireBus(((L3GD20Driver *)ip)->config->spip); + spiStart(((L3GD20Driver *)ip)->config->spip, + ((L3GD20Driver *)ip)->config->spicfg); + if(((L3GD20Driver *)ip)->config->axesenabling & L3GD20_AE_X){ + axes[0] = (int16_t)(l3gd20SPIReadRegister(((L3GD20Driver *)ip)->config->spip, + L3GD20_AD_OUT_X_L)); + axes[0] += (int16_t)(l3gd20SPIReadRegister(((L3GD20Driver *)ip)->config->spip, + L3GD20_AD_OUT_X_H) << 8); + axes[0] -= ((L3GD20Driver *)ip)->bias[0]; + } + if(((L3GD20Driver *)ip)->config->axesenabling & L3GD20_AE_Y){ + axes[1] = (int16_t)(l3gd20SPIReadRegister(((L3GD20Driver *)ip)->config->spip, + L3GD20_AD_OUT_Y_L)); + axes[1] += (int16_t)(l3gd20SPIReadRegister(((L3GD20Driver *)ip)->config->spip, + L3GD20_AD_OUT_Y_H) << 8); + axes[1] -= ((L3GD20Driver *)ip)->bias[1]; + } + if(((L3GD20Driver *)ip)->config->axesenabling & L3GD20_AE_Z){ + axes[2] = (int16_t)(l3gd20SPIReadRegister(((L3GD20Driver *)ip)->config->spip, + L3GD20_AD_OUT_Y_L)); + axes[2] += (int16_t)(l3gd20SPIReadRegister(((L3GD20Driver *)ip)->config->spip, + L3GD20_AD_OUT_Y_H) << 8); + axes[2] -= ((L3GD20Driver *)ip)->bias[2]; + } + spiReleaseBus(((L3GD20Driver *)ip)->config->spip); +#endif + return MSG_OK; +} + + +static msg_t read_cooked(void *ip, float axes[]) { + uint32_t i; + int32_t raw[L3GD20_NUMBER_OF_AXES]; + msg_t msg = read_raw(ip, raw); + for(i = 0; i < L3GD20_NUMBER_OF_AXES ; i++){ + axes[i] = raw[i] * ((L3GD20Driver *)ip)->sensitivity; + } + return msg; +} + +static msg_t reset_calibration(void *ip) { + uint32_t i; + for(i = 0; i < L3GD20_NUMBER_OF_AXES; i++) + ((L3GD20Driver *)ip)->bias[i] = 0; + return MSG_OK; +} + +static msg_t calibrate(void *ip) { + uint32_t i, j; + int32_t raw[L3GD20_NUMBER_OF_AXES]; + int32_t buff[L3GD20_NUMBER_OF_AXES] = {0, 0, 0}; + + for(i = 0; i < L3GD20_BIAS_ACQ_TIMES; i++){ + read_raw(ip, raw); + for(j = 0; j < L3GD20_NUMBER_OF_AXES; j++){ + buff[j] += raw[j]; + } + osalThreadSleepMicroseconds(L3GD20_BIAS_SETTLING_uS); + } + + for(i = 0; i < L3GD20_NUMBER_OF_AXES; i++){ + ((L3GD20Driver *)ip)->bias[i] = buff[i] / L3GD20_BIAS_ACQ_TIMES; + } + return MSG_OK; +} + +static const struct L3GD20VMT vmt = { + get_axes_number, read_raw, read_cooked, + reset_calibration, calibrate +}; +/*===========================================================================*/ +/* Driver exported functions. */ +/*===========================================================================*/ + +/** + * @brief Initializes an instance. + * + * @param[out] devp pointer to the @p L3GD20Driver object + * + * @init + */ +void l3gd20ObjectInit(L3GD20Driver *devp) { + uint32_t i; + devp->vmt = &vmt; + devp->state = L3GD20_STOP; + devp->config = NULL; + for(i = 0; i < L3GD20_NUMBER_OF_AXES; i++) + devp->bias[i] = 0; +} + +/** + * @brief Configures and activates L3GD20 Complex Driver peripheral. + * + * @param[in] devp pointer to the @p L3GD20Driver object + * @param[in] config pointer to the @p L3GD20Config object + * + * @api + */ +void l3gd20Start(L3GD20Driver *devp, const L3GD20Config *config) { + + osalDbgCheck((devp != NULL) && (config != NULL)); + osalDbgAssert((devp->state == L3GD20_STOP) || (devp->state == L3GD20_READY), + "l3gd20Start(), invalid state"); + + devp->config = config; + +#if (L3GD20_USE_SPI) + spiAcquireBus((devp)->config->spip); + spiStart((devp)->config->spip, + (devp)->config->spicfg); + l3gd20SPIWriteRegister(devp->config->spip, L3GD20_AD_CTRL_REG1, + devp->config->axesenabling | + L3GD20_PM_SLEEP_NORMAL | + devp->config->outputdatarate); + l3gd20SPIWriteRegister(devp->config->spip, L3GD20_AD_CTRL_REG4, + devp->config->fullscale | + devp->config->blockdataupdate | + devp->config->endianness); + spiReleaseBus((devp)->config->spip); +#endif /* L3GD20_USE_SPI */ + + /* Storing sensitivity information according to full scale value */ + if(devp->config->fullscale == L3GD20_FS_250DPS) + devp->sensitivity = L3GD20_SENS_250DPS; + else if(devp->config->fullscale == L3GD20_FS_500DPS) + devp->sensitivity = L3GD20_SENS_500DPS; + else if(devp->config->fullscale == L3GD20_FS_2000DPS) + devp->sensitivity = L3GD20_SENS_2000DPS; + else + osalDbgAssert(FALSE, "l3gd20Start(), full scale issue"); + /* This is the Gyroscope transient recovery time */ + osalThreadSleepMilliseconds(10); + + devp->state = L3GD20_READY; +} + +/** + * @brief Deactivates the L3GD20 Complex Driver peripheral. + * + * @param[in] devp pointer to the @p L3GD20Driver object + * + * @api + */ +void l3gd20Stop(L3GD20Driver *devp) { + + osalDbgCheck(devp != NULL); + + osalDbgAssert((devp->state == L3GD20_STOP) || (devp->state == L3GD20_READY), + "l3gd20Stop(), invalid state"); +#if (L3GD20_USE_SPI) + if (devp->state == L3GD20_STOP) { + spiAcquireBus((devp)->config->spip); + spiStart((devp)->config->spip, + (devp)->config->spicfg); + l3gd20SPIWriteRegister(devp->config->spip, L3GD20_AD_CTRL_REG1, + L3GD20_PM_POWER_DOWN | L3GD20_AE_DISABLED); + spiStop((devp)->config->spip); + spiReleaseBus((devp)->config->spip); + } +#endif /* L3GD20_USE_SPI */ + devp->state = L3GD20_STOP; +} + +/** @} */ |