/**************************************************************************** * drivers/sensors/ms5611.c * * Licensed to the Apache Software Foundation (ASF) under one or more * contributor license agreements. See the NOTICE file distributed with * this work for additional information regarding copyright ownership. The * ASF licenses this file to you under the Apache License, Version 2.0 (the * "License"); you may not use this file except in compliance with the * License. You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the * License for the specific language governing permissions and limitations * under the License. * ****************************************************************************/ /**************************************************************************** * Included Files ****************************************************************************/ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #if defined(CONFIG_SENSORS_MS5611) && \ (defined(CONFIG_I2C) || defined(CONFIG_SPI)) /**************************************************************************** * Pre-processor Definitions ****************************************************************************/ #define MS5611_CMD_RESET 0x1e #define MS5611_CMD_START_ADC_READ 0x00 #define MS5611_CMD_CONV_D1_OSR_256 0x40 /* D1 = uncompensated pressure */ #define MS5611_CMD_CONV_D1_OSR_512 0x42 #define MS5611_CMD_CONV_D1_OSR_1024 0x44 #define MS5611_CMD_CONV_D1_OSR_2048 0x46 #define MS5611_CMD_CONV_D1_OSR_4096 0x48 #define MS5611_CMD_CONV_D2_OSR_256 0x50 /* D2 = uncompensated pressure */ #define MS5611_CMD_CONV_D2_OSR_512 0x52 #define MS5611_CMD_CONV_D2_OSR_1024 0x54 #define MS5611_CMD_CONV_D2_OSR_2048 0x56 #define MS5611_CMD_CONV_D2_OSR_4096 0x58 #define MS5611_CMD_ADC_READ 0x00 #define MS5611_CMD_ADC_PROM_READ(i) (0xa0 + (i)*2) /* 0xA0 - 0xAE */ /**************************************************************************** * Private Type Definitions ****************************************************************************/ struct ms5611_calib_s { uint16_t reversed; uint16_t c1; uint16_t c2; uint16_t c3; uint16_t c4; uint16_t c5; uint16_t c6; uint16_t crc; }; struct ms5611_dev_s { FAR struct sensor_lowerhalf_s sensor_lower; #ifdef CONFIG_MS5611_I2C FAR struct i2c_master_s *i2c; /* I2C interface */ uint8_t addr; /* I2C address */ #endif #ifdef CONFIG_MS5611_SPI FAR struct spi_dev_s *spi; /* SPI interface */ #endif uint32_t freq; /* Bus Frequency I2C/SPI */ struct ms5611_calib_s calib; /* Calib. params from ROM */ unsigned int interval; /* Polling interval */ bool enabled; /* Enable/Disable MS5611 */ sem_t run; /* Locks measure cycle */ sem_t exclsem; /* Manages exclusive to device */ }; /**************************************************************************** * Private Function Prototypes ****************************************************************************/ static int ms5611_sendcmd(FAR struct ms5611_dev_s *priv, uint8_t cmd); static int ms5611_read16(FAR struct ms5611_dev_s *priv, FAR uint8_t *regval); static int ms5611_read24(FAR struct ms5611_dev_s *priv, FAR uint8_t *regval); static int32_t ms5611_compensate_temp(FAR struct ms5611_dev_s *priv, uint32_t temp, int32_t *deltat); static uint32_t ms5611_compensate_press(FAR struct ms5611_dev_s *priv, uint32_t press, uint32_t dt); static unsigned long ms5611_curtime(void); /* Sensor methods */ static int ms5611_set_interval(FAR struct sensor_lowerhalf_s *lower, FAR unsigned int *period_us); static int ms5611_activate(FAR struct sensor_lowerhalf_s *lower, bool enable); #if 0 /* Please read below */ static int ms5611_fetch(FAR struct sensor_lowerhalf_s *lower, FAR char *buffer, size_t buflen); #endif /**************************************************************************** * Private Data ****************************************************************************/ static const struct sensor_ops_s g_sensor_ops = { .activate = ms5611_activate, .fetch = NULL, /* ms5611_fetch */ .set_interval = ms5611_set_interval, }; /**************************************************************************** * Private Functions ****************************************************************************/ /**************************************************************************** * Name: ms5611_curtime * * Description: Helper to get current timestamp. * * Return: * Timestamp in microseconds ****************************************************************************/ static unsigned long ms5611_curtime(void) { struct timespec ts; #ifdef CONFIG_CLOCK_MONOTONIC clock_gettime(CLOCK_MONOTONIC, &ts); #else clock_gettime(CLOCK_REALTIME, &ts); #endif return 1000000ull * ts.tv_sec + ts.tv_nsec / 1000; } /**************************************************************************** * Name: ms5611_sendcmd * * Description: * Send a command (8-bit) to MS5611 * ****************************************************************************/ static int ms5611_sendcmd(FAR struct ms5611_dev_s *priv, uint8_t cmd) { struct i2c_msg_s msg; int ret; msg.frequency = priv->freq; msg.addr = priv->addr; msg.flags = 0; msg.buffer = &cmd; msg.length = 1; ret = I2C_TRANSFER(priv->i2c, &msg, 1); if (ret < 0) { snerr("I2C_TRANSFER failed: %d\n", ret); return ret; } return OK; } /**************************************************************************** * Name: ms5611_read16 * * Description: * Read 16-bit from a MS5611 register * ****************************************************************************/ static int ms5611_read16(FAR struct ms5611_dev_s *priv, FAR uint8_t *regval) { struct i2c_msg_s msg; int ret; msg.frequency = priv->freq; msg.addr = priv->addr; msg.flags = I2C_M_READ; msg.buffer = regval; msg.length = 2; ret = I2C_TRANSFER(priv->i2c, &msg, 1); if (ret < 0) { snerr("I2C_TRANSFER failed: %d\n", ret); return ret; } return OK; } /**************************************************************************** * Name: ms5611_read24 * * Description: * Read 24-bit from a MS5611 register * ****************************************************************************/ static int ms5611_read24(FAR struct ms5611_dev_s *priv, uint8_t *regval) { struct i2c_msg_s msg; int ret; msg.frequency = priv->freq; msg.addr = priv->addr; msg.flags = I2C_M_READ; msg.buffer = regval; msg.length = 3; ret = I2C_TRANSFER(priv->i2c, &msg, 1); if (ret < 0) { snerr("I2C_TRANSFER failed: %d\n", ret); return ret; } return OK; } static inline void baro_measure_read(FAR struct ms5611_dev_s *priv, FAR struct sensor_event_baro *baro) { uint32_t press; uint32_t temp; int32_t deltat; int ret; uint8_t buffer[3]; /* Enforce exclusive access */ ret = nxsem_wait(&priv->exclsem); if (ret < 0) { return; } /* Send command to start a D1 (pressure) conversion */ ret = ms5611_sendcmd(priv, MS5611_CMD_CONV_D1_OSR_4096); if (ret < 0) { snerr("Fail to send cmd MS5611_CMD_CONV_D1_OSR_4096!\n"); return; } /* Wait data acquisition */ up_udelay(10000); /* Send command to start a read sequence */ ret = ms5611_sendcmd(priv, MS5611_CMD_START_ADC_READ); if (ret < 0) { snerr("Fail to send cmd MS5611_CMD_START_ADC_READ!\n"); return; } /* Wait data get ready */ up_udelay(4000); ret = ms5611_read24(priv, buffer); if (ret < 0) { snerr("Fail to read pressure!\n"); return; } press = (uint32_t) buffer[0] << 16 | (uint32_t) buffer[1] << 8 | (uint32_t) buffer[2]; /* Send command to start a D2 (temperature) conversion */ ret = ms5611_sendcmd(priv, MS5611_CMD_CONV_D2_OSR_4096); if (ret < 0) { snerr("Fail to send cmd MS5611_CMD_CONV_D2_OSR_4096!\n"); return; } /* Wait data acquisition */ up_udelay(10000); /* Send command to start a read sequence */ ret = ms5611_sendcmd(priv, MS5611_CMD_START_ADC_READ); if (ret < 0) { snerr("Fail to send cmd MS5611_CMD_START_ADC_READ!\n"); return; } /* Wait data get ready */ up_udelay(4000); ret = ms5611_read24(priv, buffer); if (ret < 0) { snerr("Fail to read temperature!\n"); return; } temp = (uint32_t) buffer[0] << 16 | (uint32_t) buffer[1] << 8 | (uint32_t) buffer[2]; /* Release the semaphore */ nxsem_post(&priv->exclsem); /* Compensate the temp/press with calibration data */ temp = ms5611_compensate_temp(priv, temp, &deltat); press = ms5611_compensate_press(priv, press, deltat); baro->timestamp = ms5611_curtime(); baro->pressure = press / 100.0f; baro->temperature = temp / 100.0f; } /**************************************************************************** * Name: ms5611_thread * * Description: Thread for performing interval measurement cycle and data * read. * * Parameter: * argc - Number opf arguments * argv - Pointer to argument list ****************************************************************************/ static int ms5611_thread(int argc, char **argv) { FAR struct ms5611_dev_s *priv = (FAR struct ms5611_dev_s *) ((uintptr_t)strtoul(argv[1], NULL, 0)); struct sensor_event_baro baro_data; while (true) { int ret; if (!priv->enabled) { /* Waiting to be woken up */ ret = nxsem_wait(&priv->run); if (ret < 0) { continue; } } baro_measure_read(priv, &baro_data); priv->sensor_lower.push_event(priv->sensor_lower.priv, &baro_data, sizeof(struct sensor_event_baro)); /* Sleeping thread before fetching the next sensor data */ nxsig_usleep(priv->interval); } return OK; } /**************************************************************************** * Name: ms5611_initialize * * Description: * Initialize MS5611 device * ****************************************************************************/ static int ms5611_initialize(FAR struct ms5611_dev_s *priv) { uint16_t prom[8]; uint8_t data[2]; uint8_t crc; int i; int ret; /* Get calibration data. */ ret = ms5611_sendcmd(priv, MS5611_CMD_RESET); if (ret < 0) { snerr("ms5611 reset failed\n"); return ret; } /* We have to wait before the prom is ready is be read */ up_udelay(10000); for (i = 0; i < 8; i++) { ret = ms5611_sendcmd(priv, MS5611_CMD_ADC_PROM_READ(i)); if (ret < 0) { snerr("ms5611_sendcmd failed\n"); return ret; } ret = ms5611_read16(priv, data); if (ret < 0) { snerr("ms5611_read16 failed\n"); return ret; } prom[i] = (uint16_t) data[0] << 8 | (uint16_t) data[1]; } /* Get the 4-bit CRC from PROM */ crc = (uint8_t)(prom[7] & 0xf); /* Verify if the calculated CRC is equal to PROM's CRC */ if (crc != msxxxx_crc4(prom, 7, 0xff)) { snerr("ERROR: Calculated CRC different from PROM's CRC!\n"); return -ENODEV; } /* Fill read calibration coefficients */ priv->calib.c1 = prom[1]; priv->calib.c2 = prom[2]; priv->calib.c3 = prom[3]; priv->calib.c4 = prom[4]; priv->calib.c5 = prom[5]; priv->calib.c6 = prom[6]; return ret; } /**************************************************************************** * Name: ms5611_compensate_temp * * Description: * calculate compensate temperature * * Input Parameters: * temp - uncompensate value of temperature. * * Returned Value: * calculate result of compensate temperature. * ****************************************************************************/ static int32_t ms5611_compensate_temp(FAR struct ms5611_dev_s *priv, uint32_t temp, int32_t *deltat) { struct ms5611_calib_s *c = &priv->calib; int32_t dt; /* dt = d1 - c5 * 256 */ dt = temp - ((int32_t) c->c5 << 8); /* temp = 2000 + (dt * c6) / 8388608 */ temp = 2000 + (((int64_t) (dt * c->c6)) >> 23); /* Save dt that will be used for pressure calibration */ *deltat = dt; return temp; } /**************************************************************************** * Name: ms5611_compensate_press * * Description: * calculate compensate pressure * * Input Parameters: * press - uncompensate value of pressure. * * Returned Value: * calculate result of compensate pressure. * ****************************************************************************/ static uint32_t ms5611_compensate_press(FAR struct ms5611_dev_s *priv, uint32_t press, uint32_t dt) { struct ms5611_calib_s *c = &priv->calib; int64_t off; int64_t sens; off = ((int64_t) c->c2 * 65536) + ((int64_t) (c->c4 * dt) / 128); sens = ((int64_t) c->c1 * 32768) + ((int64_t) (c->c3 * dt) / 256); press = (((press * sens) / 2097152) - off) / 32768; return press; } /**************************************************************************** * Name: ms5611_set_interval ****************************************************************************/ static int ms5611_set_interval(FAR struct sensor_lowerhalf_s *lower, FAR unsigned int *period_us) { FAR struct ms5611_dev_s *priv = container_of(lower, FAR struct ms5611_dev_s, sensor_lower); priv->interval = *period_us; return OK; } /**************************************************************************** * Name: ms5611_activate ****************************************************************************/ static int ms5611_activate(FAR struct sensor_lowerhalf_s *lower, bool enable) { bool start_thread = false; struct ms5611_dev_s *priv = (FAR struct ms5611_dev_s *)lower; if (enable) { if (!priv->enabled) { start_thread = true; } } priv->enabled = enable; if (start_thread) { /* Wake up the thread */ nxsem_post(&priv->run); } return OK; } /**************************************************************************** * Name: ms5611_fetch ****************************************************************************/ /* N.B. When fetch is enabled the sensortest doesn't respect the * interval (-i) parameter, so let keep it comment until further * discussion about the "issue". */ #if 0 static int ms5611_fetch(FAR struct sensor_lowerhalf_s *lower, FAR char *buffer, size_t buflen) { FAR struct ms5611_dev_s *priv = container_of(lower, FAR struct ms5611_dev_s, sensor_lower); struct sensor_event_baro baro_data; if (buflen != sizeof(baro_data)) { return -EINVAL; } baro_measure_read(priv, &baro_data); memcpy(buffer, &baro_data, sizeof(baro_data)); return buflen; } #endif /**************************************************************************** * Public Functions ****************************************************************************/ /**************************************************************************** * Name: ms5611_register * * Description: * Register the MS5611 character device * * Input Parameters: * i2c - An instance of the I2C interface to use to communicate with * MS5611 * devno - Instance number for driver * addr - The I2C address of the MS5611. * * Returned Value: * Zero (OK) on success; a negated errno value on failure. * ****************************************************************************/ int ms5611_register(FAR struct i2c_master_s *i2c, int devno, uint8_t addr) { FAR struct ms5611_dev_s *priv; FAR char *argv[2]; char arg1[32]; int ret; /* Initialize the MS5611 device structure */ priv = (FAR struct ms5611_dev_s *)kmm_zalloc(sizeof(struct ms5611_dev_s)); if (priv == NULL) { snerr("Failed to allocate instance\n"); return -ENOMEM; } priv->i2c = i2c; priv->addr = addr; priv->freq = CONFIG_MS5611_I2C_FREQUENCY; priv->interval = 1000000; /* Default interval 1s */ nxsem_init(&priv->run, 0, 0); nxsem_init(&priv->exclsem, 0, 1); priv->sensor_lower.ops = &g_sensor_ops; priv->sensor_lower.type = SENSOR_TYPE_BAROMETER; ret = ms5611_initialize(priv); if (ret < 0) { snerr("Failed to initialize physical device ms5611:%d\n", ret); kmm_free(priv); return ret; } /* Register the character driver */ ret = sensor_register(&priv->sensor_lower, devno); if (ret < 0) { snerr("Failed to register driver: %d\n", ret); kmm_free(priv); return ret; } /* Create thread for polling sensor data */ snprintf(arg1, 16, "0x%" PRIxPTR, (uintptr_t)priv); argv[0] = arg1; argv[1] = NULL; ret = kthread_create("ms5611_thread", SCHED_PRIORITY_DEFAULT, CONFIG_MS5611_THREAD_STACKSIZE, ms5611_thread, argv); if (ret < 0) { snerr("Failed to create the notification kthread!\n"); sensor_unregister(&priv->sensor_lower, devno); kmm_free(priv); return ret; } sninfo("MS5611 driver loaded successfully!\n"); return OK; } #endif