1 /* 2 * Copyright (c) 2022 Thomas Stranger 3 * 4 * SPDX-License-Identifier: Apache-2.0 5 */ 6 7 #ifndef ZEPHYR_DRIVERS_SENSOR_DS18B20_DS18B20_H_ 8 #define ZEPHYR_DRIVERS_SENSOR_DS18B20_DS18B20_H_ 9 10 #include <zephyr/device.h> 11 #include <zephyr/devicetree.h> 12 #include <zephyr/kernel.h> 13 #include <zephyr/drivers/gpio.h> 14 #include <zephyr/drivers/w1.h> 15 #include <zephyr/sys/util_macro.h> 16 17 #define DS18B20_CMD_CONVERT_T 0x44 18 #define DS18B20_CMD_WRITE_SCRATCHPAD 0x4E 19 #define DS18B20_CMD_READ_SCRATCHPAD 0xBE 20 #define DS18B20_CMD_COPY_SCRATCHPAD 0x48 21 #define DS18B20_CMD_RECALL_EEPROM 0xB8 22 #define DS18B20_CMD_READ_POWER_SUPPLY 0xB4 23 24 /* resolution is set using bit 5 and 6 of configuration register 25 * macro only valid for values 9 to 12 26 */ 27 #define DS18B20_RESOLUTION_POS 5 28 #define DS18B20_RESOLUTION_MASK (BIT_MASK(2) << DS18B20_RESOLUTION_POS) 29 /* convert resolution in bits to scratchpad config format */ 30 #define DS18B20_RESOLUTION(res) ((res - 9) << DS18B20_RESOLUTION_POS) 31 /* convert resolution in bits to array index (for resolution specific elements) */ 32 #define DS18B20_RESOLUTION_INDEX(res) (res - 9) 33 34 struct ds18b20_scratchpad { 35 int16_t temp; 36 uint8_t alarm_temp_high; 37 uint8_t alarm_temp_low; 38 uint8_t config; 39 uint8_t res[3]; 40 uint8_t crc; 41 }; 42 43 struct ds18b20_config { 44 const struct device *bus; 45 uint8_t family; 46 uint8_t resolution; 47 }; 48 49 struct ds18b20_data { 50 struct w1_slave_config config; 51 struct ds18b20_scratchpad scratchpad; 52 bool lazy_loaded; 53 }; 54 ds18b20_bus(const struct device * dev)55static inline const struct device *ds18b20_bus(const struct device *dev) 56 { 57 const struct ds18b20_config *dcp = dev->config; 58 59 return dcp->bus; 60 } 61 62 #endif /* ZEPHYR_DRIVERS_SENSOR_DS18B20_DS18B20_H_ */ 63
