/** ****************************************************************************** * @addtogroup PIOS PIOS Core hardware abstraction layer * @{ * @addtogroup PIOS_HMC5x83 HMC5x83 Functions * @brief Deals with the hardware interface to the magnetometers * @{ * @file pios_hmc5x83.c * @author The OpenPilot Team, http://www.openpilot.org Copyright (C) 2012. * @brief HMC5x83 Magnetic Sensor Functions from AHRS * @see The GNU Public License (GPL) Version 3 * ****************************************************************************** */ /* * This program 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. * * 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 General Public License * for more details. * * You should have received a copy of the GNU General Public License along * with this program; if not, write to the Free Software Foundation, Inc., * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ #include "pios.h" #include #include #ifdef PIOS_INCLUDE_HMC5X83 #define PIOS_HMC5X83_MAGIC 0x4d783833 /* Global Variables */ /* Local Types */ typedef struct { uint32_t magic; const struct pios_hmc5x83_cfg *cfg; uint32_t port_id; uint8_t slave_num; uint8_t CTRLB; volatile bool data_ready; } pios_hmc5x83_dev_data_t; static int32_t PIOS_HMC5x83_Config(pios_hmc5x83_dev_data_t *dev); // sensor driver interface bool PIOS_HMC5x83_driver_Test(uintptr_t context); void PIOS_HMC5x83_driver_Reset(uintptr_t context); void PIOS_HMC5x83_driver_get_scale(float *scales, uint8_t size, uintptr_t context); void PIOS_HMC5x83_driver_fetch(void *, uint8_t size, uintptr_t context); bool PIOS_HMC5x83_driver_poll(uintptr_t context); const PIOS_SENSORS_Driver PIOS_HMC5x83_Driver = { .test = PIOS_HMC5x83_driver_Test, .poll = PIOS_HMC5x83_driver_poll, .fetch = PIOS_HMC5x83_driver_fetch, .reset = PIOS_HMC5x83_driver_Reset, .get_queue = NULL, .get_scale = PIOS_HMC5x83_driver_get_scale, .is_polled = true, }; /** * Allocate the device setting structure * @return pios_hmc5x83_dev_data_t pointer to newly created structure */ pios_hmc5x83_dev_data_t *dev_alloc() { pios_hmc5x83_dev_data_t *dev = (pios_hmc5x83_dev_data_t *)pios_malloc(sizeof(pios_hmc5x83_dev_data_t)); PIOS_DEBUG_Assert(dev); memset(dev, 0x00, sizeof(pios_hmc5x83_dev_data_t)); dev->magic = PIOS_HMC5X83_MAGIC; return dev; } /** * Validate a pios_hmc5x83_dev_t handler and return the related pios_hmc5x83_dev_data_t pointer * @param dev device handler * @return the device data structure */ pios_hmc5x83_dev_data_t *dev_validate(pios_hmc5x83_dev_t dev) { pios_hmc5x83_dev_data_t *dev_data = (pios_hmc5x83_dev_data_t *)dev; PIOS_DEBUG_Assert(dev_data->magic == PIOS_HMC5X83_MAGIC); return dev_data; } /** * @brief Initialize the HMC5x83 magnetometer sensor. * @return none */ pios_hmc5x83_dev_t PIOS_HMC5x83_Init(const struct pios_hmc5x83_cfg *cfg, uint32_t port_id, uint8_t slave_num) { pios_hmc5x83_dev_data_t *dev = dev_alloc(); dev->cfg = cfg; // store config before enabling interrupt dev->port_id = port_id; dev->slave_num = slave_num; #ifdef PIOS_HMC5X83_HAS_GPIOS PIOS_EXTI_Init(cfg->exti_cfg); #endif int32_t val = PIOS_HMC5x83_Config(dev); PIOS_Assert(val == 0); dev->data_ready = false; return (pios_hmc5x83_dev_t)dev; } void PIOS_HMC5x83_Register(pios_hmc5x83_dev_t handler) { PIOS_SENSORS_Register(&PIOS_HMC5x83_Driver, PIOS_SENSORS_TYPE_3AXIS_MAG, handler); } /** * @brief Initialize the HMC5x83 magnetometer sensor * \return none * \param[in] pios_hmc5x83_dev_data_t device config to be used. * \param[in] PIOS_HMC5x83_ConfigTypeDef struct to be used to configure sensor. * * CTRL_REGA: Control Register A * Read Write * Default value: 0x10 * 7:5 0 These bits must be cleared for correct operation. * 4:2 DO2-DO0: Data Output Rate Bits * DO2 | DO1 | DO0 | Minimum Data Output Rate (Hz) * ------------------------------------------------------ * 0 | 0 | 0 | 0.75 * 0 | 0 | 1 | 1.5 * 0 | 1 | 0 | 3 * 0 | 1 | 1 | 7.5 * 1 | 0 | 0 | 15 (default) * 1 | 0 | 1 | 30 * 1 | 1 | 0 | 75 * 1 | 1 | 1 | Not Used * 1:0 MS1-MS0: Measurement Configuration Bits * MS1 | MS0 | MODE * ------------------------------ * 0 | 0 | Normal * 0 | 1 | Positive Bias * 1 | 0 | Negative Bias * 1 | 1 | Not Used * * CTRL_REGB: Control RegisterB * Read Write * Default value: 0x20 * 7:5 GN2-GN0: Gain Configuration Bits. * GN2 | GN1 | GN0 | Mag Input | Gain | Output Range * | | | Range[Ga] | [LSB/mGa] | * ------------------------------------------------------ * 0 | 0 | 0 | ±0.88Ga | 1370 | 0xF800–0x07FF (-2048:2047) * 0 | 0 | 1 | ±1.3Ga (def) | 1090 | 0xF800–0x07FF (-2048:2047) * 0 | 1 | 0 | ±1.9Ga | 820 | 0xF800–0x07FF (-2048:2047) * 0 | 1 | 1 | ±2.5Ga | 660 | 0xF800–0x07FF (-2048:2047) * 1 | 0 | 0 | ±4.0Ga | 440 | 0xF800–0x07FF (-2048:2047) * 1 | 0 | 1 | ±4.7Ga | 390 | 0xF800–0x07FF (-2048:2047) * 1 | 1 | 0 | ±5.6Ga | 330 | 0xF800–0x07FF (-2048:2047) * 1 | 1 | 1 | ±8.1Ga | 230 | 0xF800–0x07FF (-2048:2047) * |Not recommended| * * 4:0 CRB4-CRB: 0 This bit must be cleared for correct operation. * * _MODE_REG: Mode Register * Read Write * Default value: 0x02 * 7:2 0 These bits must be cleared for correct operation. * 1:0 MD1-MD0: Mode Select Bits * MS1 | MS0 | MODE * ------------------------------ * 0 | 0 | Continuous-Conversion Mode. * 0 | 1 | Single-Conversion Mode * 1 | 0 | Negative Bias * 1 | 1 | Sleep Mode */ static int32_t PIOS_HMC5x83_Config(pios_hmc5x83_dev_data_t *dev) { uint8_t CTRLA = 0x00; uint8_t MODE = 0x00; const struct pios_hmc5x83_cfg *cfg = dev->cfg; dev->CTRLB = 0; CTRLA |= (uint8_t)(cfg->M_ODR | cfg->Meas_Conf); CTRLA |= cfg->TempCompensation ? PIOS_HMC5x83_CTRLA_TEMP : 0; dev->CTRLB |= (uint8_t)(cfg->Gain); MODE |= (uint8_t)(cfg->Mode); // CRTL_REGA if (cfg->Driver->Write((pios_hmc5x83_dev_t)dev, PIOS_HMC5x83_CONFIG_REG_A, CTRLA) != 0) { return -1; } // CRTL_REGB if (cfg->Driver->Write((pios_hmc5x83_dev_t)dev, PIOS_HMC5x83_CONFIG_REG_B, dev->CTRLB) != 0) { return -1; } // Mode register if (cfg->Driver->Write((pios_hmc5x83_dev_t)dev, PIOS_HMC5x83_MODE_REG, MODE) != 0) { return -1; } return 0; } /** * @brief Read current X, Z, Y values (in that order) * \param[in] dev device handler * \param[out] int16_t array of size 3 to store X, Z, and Y magnetometer readings * \return 0 for success or -1 for failure */ int32_t PIOS_HMC5x83_ReadMag(pios_hmc5x83_dev_t handler, int16_t out[3]) { pios_hmc5x83_dev_data_t *dev = dev_validate(handler); dev->data_ready = false; uint8_t buffer[6]; int32_t temp; int32_t sensitivity; if (dev->cfg->Driver->Read(handler, PIOS_HMC5x83_DATAOUT_XMSB_REG, buffer, 6) != 0) { return -1; } switch (dev->CTRLB & 0xE0) { case 0x00: sensitivity = PIOS_HMC5x83_Sensitivity_0_88Ga; break; case 0x20: sensitivity = PIOS_HMC5x83_Sensitivity_1_3Ga; break; case 0x40: sensitivity = PIOS_HMC5x83_Sensitivity_1_9Ga; break; case 0x60: sensitivity = PIOS_HMC5x83_Sensitivity_2_5Ga; break; case 0x80: sensitivity = PIOS_HMC5x83_Sensitivity_4_0Ga; break; case 0xA0: sensitivity = PIOS_HMC5x83_Sensitivity_4_7Ga; break; case 0xC0: sensitivity = PIOS_HMC5x83_Sensitivity_5_6Ga; break; case 0xE0: sensitivity = PIOS_HMC5x83_Sensitivity_8_1Ga; break; default: PIOS_Assert(0); } for (int i = 0; i < 3; i++) { temp = ((int16_t)((uint16_t)buffer[2 * i] << 8) + buffer[2 * i + 1]) * 1000 / sensitivity; out[i] = temp; } // Data reads out as X,Z,Y temp = out[2]; out[2] = out[1]; out[1] = temp; // This should not be necessary but for some reason it is coming out of continuous conversion mode dev->cfg->Driver->Write(handler, PIOS_HMC5x83_MODE_REG, PIOS_HMC5x83_MODE_CONTINUOUS); return 0; } /** * @brief Read the identification bytes from the HMC5x83 sensor * \param[out] uint8_t array of size 4 to store HMC5x83 ID. * \return 0 if successful, -1 if not */ uint8_t PIOS_HMC5x83_ReadID(pios_hmc5x83_dev_t handler, uint8_t out[4]) { pios_hmc5x83_dev_data_t *dev = dev_validate(handler); uint8_t retval = dev->cfg->Driver->Read(handler, PIOS_HMC5x83_DATAOUT_IDA_REG, out, 3); out[3] = '\0'; return retval; } /** * @brief Tells whether new magnetometer readings are available * \return true if new data is available * \return false if new data is not available */ bool PIOS_HMC5x83_NewDataAvailable(pios_hmc5x83_dev_t handler) { pios_hmc5x83_dev_data_t *dev = dev_validate(handler); return dev->data_ready; } /** * @brief Run self-test operation. Do not call this during operational use!! * \return 0 if success, -1 if test failed */ int32_t PIOS_HMC5x83_Test(pios_hmc5x83_dev_t handler) { int32_t failed = 0; uint8_t registers[3] = { 0, 0, 0 }; uint8_t status; uint8_t ctrl_a_read; uint8_t ctrl_b_read; uint8_t mode_read; int16_t values[3]; pios_hmc5x83_dev_data_t *dev = dev_validate(handler); /* Verify that ID matches (HMC5x83 ID is null-terminated ASCII string "H43") */ char id[4]; PIOS_HMC5x83_ReadID(handler, (uint8_t *)id); if ((id[0] != 'H') || (id[1] != '4') || (id[2] != '3')) { // Expect H43 return -1; } /* Backup existing configuration */ if (dev->cfg->Driver->Read(handler, PIOS_HMC5x83_CONFIG_REG_A, registers, 3) != 0) { return -1; } /* Stop the device and read out last value */ PIOS_DELAY_WaitmS(10); if (dev->cfg->Driver->Write(handler, PIOS_HMC5x83_MODE_REG, PIOS_HMC5x83_MODE_IDLE) != 0) { return -1; } if (dev->cfg->Driver->Read(handler, PIOS_HMC5x83_DATAOUT_STATUS_REG, &status, 1) != 0) { return -1; } if (PIOS_HMC5x83_ReadMag(handler, values) != 0) { return -1; } /* * Put HMC5x83 into self test mode * This is done by placing measurement config into positive (0x01) or negative (0x10) bias * and then placing the mode register into single-measurement mode. This causes the HMC5x83 * to create an artificial magnetic field of ~1.1 Gauss. * * If gain were PIOS_HMC5x83_GAIN_2_5, for example, X and Y will read around +766 LSB * (1.16 Ga * 660 LSB/Ga) and Z would read around +713 LSB (1.08 Ga * 660 LSB/Ga) * * Changing measurement config back to PIOS_HMC5x83_MEASCONF_NORMAL will leave self-test mode. */ PIOS_DELAY_WaitmS(10); if (dev->cfg->Driver->Write(handler, PIOS_HMC5x83_CONFIG_REG_A, PIOS_HMC5x83_MEASCONF_BIAS_POS | PIOS_HMC5x83_ODR_15) != 0) { return -1; } PIOS_DELAY_WaitmS(10); if (dev->cfg->Driver->Write(handler, PIOS_HMC5x83_CONFIG_REG_B, PIOS_HMC5x83_GAIN_8_1) != 0) { return -1; } PIOS_DELAY_WaitmS(10); if (dev->cfg->Driver->Write(handler, PIOS_HMC5x83_MODE_REG, PIOS_HMC5x83_MODE_SINGLE) != 0) { return -1; } /* Must wait for value to be updated */ PIOS_DELAY_WaitmS(200); if (PIOS_HMC5x83_ReadMag(handler, values) != 0) { return -1; } dev->cfg->Driver->Read(handler, PIOS_HMC5x83_CONFIG_REG_A, &ctrl_a_read, 1); dev->cfg->Driver->Read(handler, PIOS_HMC5x83_CONFIG_REG_B, &ctrl_b_read, 1); dev->cfg->Driver->Read(handler, PIOS_HMC5x83_MODE_REG, &mode_read, 1); dev->cfg->Driver->Read(handler, PIOS_HMC5x83_DATAOUT_STATUS_REG, &status, 1); /* Restore backup configuration */ PIOS_DELAY_WaitmS(10); if (dev->cfg->Driver->Write(handler, PIOS_HMC5x83_CONFIG_REG_A, registers[0]) != 0) { return -1; } PIOS_DELAY_WaitmS(10); if (dev->cfg->Driver->Write(handler, PIOS_HMC5x83_CONFIG_REG_B, registers[1]) != 0) { return -1; } PIOS_DELAY_WaitmS(10); if (dev->cfg->Driver->Write(handler, PIOS_HMC5x83_MODE_REG, registers[2]) != 0) { return -1; } return failed; } /** * @brief IRQ Handler */ bool PIOS_HMC5x83_IRQHandler(pios_hmc5x83_dev_t handler) { pios_hmc5x83_dev_data_t *dev = dev_validate(handler); dev->data_ready = true; return false; } #ifdef PIOS_INCLUDE_SPI int32_t PIOS_HMC5x83_SPI_Read(pios_hmc5x83_dev_t handler, uint8_t address, uint8_t *buffer, uint8_t len); int32_t PIOS_HMC5x83_SPI_Write(pios_hmc5x83_dev_t handler, uint8_t address, uint8_t buffer); const struct pios_hmc5x83_io_driver PIOS_HMC5x83_SPI_DRIVER = { .Read = PIOS_HMC5x83_SPI_Read, .Write = PIOS_HMC5x83_SPI_Write, }; static int32_t pios_hmc5x83_spi_claim_bus(pios_hmc5x83_dev_data_t *dev) { if (PIOS_SPI_ClaimBus(dev->port_id) < 0) { return -1; } PIOS_SPI_SetClockSpeed(dev->port_id, SPI_BaudRatePrescaler_16); PIOS_SPI_RC_PinSet(dev->port_id, dev->slave_num, 0); return 0; } static void pios_hmc5x83_spi_release_bus(pios_hmc5x83_dev_data_t *dev) { PIOS_SPI_RC_PinSet(dev->port_id, dev->slave_num, 1); PIOS_SPI_ReleaseBus(dev->port_id); } /** * @brief Reads one or more bytes into a buffer * \param[in] address HMC5x83 register address (depends on size) * \param[out] buffer destination buffer * \param[in] len number of bytes which should be read * \return 0 if operation was successful * \return -1 if error during I2C transfer * \return -2 if unable to claim i2c device */ int32_t PIOS_HMC5x83_SPI_Read(pios_hmc5x83_dev_t handler, uint8_t address, uint8_t *buffer, uint8_t len) { pios_hmc5x83_dev_data_t *dev = dev_validate(handler); if (pios_hmc5x83_spi_claim_bus(dev) < 0) { return -1; } memset(buffer, 0xA5, len); PIOS_SPI_TransferByte(dev->port_id, address | PIOS_HMC5x83_SPI_AUTOINCR_FLAG | PIOS_HMC5x83_SPI_READ_FLAG); // buffer[0] = address | PIOS_HMC5x83_SPI_AUTOINCR_FLAG | PIOS_HMC5x83_SPI_READ_FLAG; /* Copy the transfer data to the buffer */ if (PIOS_SPI_TransferBlock(dev->port_id, NULL, buffer, len, NULL) < 0) { pios_hmc5x83_spi_release_bus(dev); return -3; } pios_hmc5x83_spi_release_bus(dev); return 0; } /** * @brief Writes one or more bytes to the HMC5x83 * \param[in] address Register address * \param[in] buffer source buffer * \return 0 if operation was successful * \return -1 if error during I2C transfer * \return -2 if unable to claim spi device */ int32_t PIOS_HMC5x83_SPI_Write(pios_hmc5x83_dev_t handler, uint8_t address, uint8_t buffer) { pios_hmc5x83_dev_data_t *dev = dev_validate(handler); if (pios_hmc5x83_spi_claim_bus(dev) < 0) { return -1; } uint8_t data[] = { address | PIOS_HMC5x83_SPI_AUTOINCR_FLAG, buffer, }; if (PIOS_SPI_TransferBlock(dev->port_id, data, NULL, sizeof(data), NULL) < 0) { pios_hmc5x83_spi_release_bus(dev); return -2; } pios_hmc5x83_spi_release_bus(dev); return 0; } #endif /* PIOS_INCLUDE_SPI */ #ifdef PIOS_INCLUDE_I2C int32_t PIOS_HMC5x83_I2C_Read(pios_hmc5x83_dev_t handler, uint8_t address, uint8_t *buffer, uint8_t len); int32_t PIOS_HMC5x83_I2C_Write(pios_hmc5x83_dev_t handler, uint8_t address, uint8_t buffer); const struct pios_hmc5x83_io_driver PIOS_HMC5x83_I2C_DRIVER = { .Read = PIOS_HMC5x83_I2C_Read, .Write = PIOS_HMC5x83_I2C_Write, }; /** * @brief Reads one or more bytes into a buffer * \param[in] address HMC5x83 register address (depends on size) * \param[out] buffer destination buffer * \param[in] len number of bytes which should be read * \return 0 if operation was successful * \return -1 if error during I2C transfer * \return -2 if unable to claim i2c device */ int32_t PIOS_HMC5x83_I2C_Read(pios_hmc5x83_dev_t handler, uint8_t address, uint8_t *buffer, uint8_t len) { pios_hmc5x83_dev_data_t *dev = dev_validate(handler); uint8_t addr_buffer[] = { address, }; const struct pios_i2c_txn txn_list[] = { { .info = __func__, .addr = PIOS_HMC5x83_I2C_ADDR, .rw = PIOS_I2C_TXN_WRITE, .len = sizeof(addr_buffer), .buf = addr_buffer, } , { .info = __func__, .addr = PIOS_HMC5x83_I2C_ADDR, .rw = PIOS_I2C_TXN_READ, .len = len, .buf = buffer, } }; return PIOS_I2C_Transfer(dev->port_id, txn_list, NELEMENTS(txn_list)); } /** * @brief Writes one or more bytes to the HMC5x83 * \param[in] address Register address * \param[in] buffer source buffer * \return 0 if operation was successful * \return -1 if error during I2C transfer * \return -2 if unable to claim i2c device */ int32_t PIOS_HMC5x83_I2C_Write(pios_hmc5x83_dev_t handler, uint8_t address, uint8_t buffer) { pios_hmc5x83_dev_data_t *dev = dev_validate(handler); uint8_t data[] = { address, buffer, }; const struct pios_i2c_txn txn_list[] = { { .info = __func__, .addr = PIOS_HMC5x83_I2C_ADDR, .rw = PIOS_I2C_TXN_WRITE, .len = sizeof(data), .buf = data, } , }; ; return PIOS_I2C_Transfer(dev->port_id, txn_list, NELEMENTS(txn_list)); } #endif /* PIOS_INCLUDE_I2C */ /* PIOS sensor driver implementation */ bool PIOS_HMC5x83_driver_Test(uintptr_t context) { return !PIOS_HMC5x83_Test((pios_hmc5x83_dev_t)context); } void PIOS_HMC5x83_driver_Reset(__attribute__((unused)) uintptr_t context) {} void PIOS_HMC5x83_driver_get_scale(float *scales, uint8_t size, __attribute__((unused)) uintptr_t context) { PIOS_Assert(size > 0); scales[0] = 1; } void PIOS_HMC5x83_driver_fetch(void *data, uint8_t size, uintptr_t context) { PIOS_Assert(size > 0); int16_t mag[3]; PIOS_HMC5x83_ReadMag((pios_hmc5x83_dev_t)context, mag); PIOS_SENSORS_3Axis_SensorsWithTemp *tmp = data; tmp->count = 1; tmp->sample[0].x = mag[0]; tmp->sample[0].y = mag[1]; tmp->sample[0].z = mag[2]; tmp->temperature = 0; } bool PIOS_HMC5x83_driver_poll(uintptr_t context) { return PIOS_HMC5x83_NewDataAvailable((pios_hmc5x83_dev_t)context); } #endif /* PIOS_INCLUDE_HMC5x83 */ /** * @} * @} */