169 lines
4.9 KiB
C
169 lines
4.9 KiB
C
// Copyright 2021 IOsetting <iosetting(at)outlook.com>
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef __FW_DS18B20__
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#define __FW_DS18B20__
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#include "fw_hal.h"
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/**
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* DS18B20 - Programmable Resolution 1-Wire Digital Thermometer
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*
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* To-92 Pins:
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* With the flat side facing you and with the leads pointing down, they are GND, DQ and Vdd
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*
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*/
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#define DS18B20_DQ P35
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#define DS18B20_DQ_PULLUP() GPIO_SetPullUp(GPIO_Port_3, GPIO_Pin_5, HAL_State_ON)
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#define DS18B20_DQ_INPUT() GPIO_P3_SetMode(GPIO_Pin_5, GPIO_Mode_Input_HIP)
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#define DS18B20_DQ_OUTPUT() GPIO_P3_SetMode(GPIO_Pin_5, GPIO_Mode_InOut_OD)
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#define DS18B20_DQ_LOW() DS18B20_DQ=RESET
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#define DS18B20_DQ_HIGH() DS18B20_DQ=SET
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/* OneWire commands */
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#define ONEWIRE_CMD_RSCRATCHPAD 0xBE
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#define ONEWIRE_CMD_WSCRATCHPAD 0x4E
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#define ONEWIRE_CMD_CPYSCRATCHPAD 0x48
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#define ONEWIRE_CMD_RECEEPROM 0xB8
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#define ONEWIRE_CMD_RPWRSUPPLY 0xB4
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#define ONEWIRE_CMD_SEARCHROM 0xF0
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#define ONEWIRE_CMD_READROM 0x33
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#define ONEWIRE_CMD_MATCHROM 0x55
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#define ONEWIRE_CMD_SKIPROM 0xCC
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#define DS18B20_FAMILY_CODE 0x28
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#define DS18B20_CMD_ALARMSEARCH 0xEC
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/* DS18B20 read temperature command */
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#define DS18B20_CMD_CONVERTTEMP 0x44 /* Convert temperature */
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#define DS18B20_DECIMAL_STEPS_12BIT 0.0625
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#define DS18B20_DECIMAL_STEPS_11BIT 0.125
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#define DS18B20_DECIMAL_STEPS_10BIT 0.25
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#define DS18B20_DECIMAL_STEPS_9BIT 0.5
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/* Bits locations for resolution */
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#define DS18B20_RESOLUTION_R1 6
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#define DS18B20_RESOLUTION_R0 5
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typedef enum {
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DS18B20_Resolution_9bits = 9, /*!< DS18B20 9 bits resolution */
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DS18B20_Resolution_10bits = 10, /*!< DS18B20 10 bits resolution */
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DS18B20_Resolution_11bits = 11, /*!< DS18B20 11 bits resolution */
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DS18B20_Resolution_12bits = 12 /*!< DS18B20 12 bits resolution */
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} DS18B20_Resolution_t;
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/**
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* @brief Initialize DS18B20
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*/
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void DS18B20_Init(void);
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/**
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* @brief Reset DS18B20
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* @return bit value
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*/
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__BIT DS18B20_Reset(void);
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/**
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* @brief Read one bit from DS18B20
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* @return bit value
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*/
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__BIT DS18B20_ReadBit(void);
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/**
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* @brief Read one byte from DS18B20
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* @return byte value
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*/
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uint8_t DS18B20_ReadByte(void);
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/**
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* @brief Write one bit to DS18B20
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* @param b bit value
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*/
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void DS18B20_WriteBit(__BIT b);
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/**
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* @brief Write one byte to DS18B20
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* @param byte byte value
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*/
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void DS18B20_WriteByte(uint8_t byte);
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/**
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* @brief 8-bit CRC calculation
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*
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* @param addr
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* @param len
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* @return crc result
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*/
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uint8_t DS18B20_Crc(uint8_t *addr, uint8_t len);
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/**
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* @brief Read SRAM scratchpad
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* @param buf a 9-byte buffer, Byte 8 contains the CRC code for bytes 0 through 7
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*/
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void DS18B20_ReadScratchpad(uint8_t *buf);
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/**
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* @brief Start conversion on all slaves
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*/
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void DS18B20_StartAll(void);
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/**
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* @brief If read bit is low, then device is not finished yet with calculation temperature
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* @return bit value
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*/
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__BIT DS18B20_AllDone(void);
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/**
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* @brief Read 64-bit ROM: 8-bit family code "0x28", unique 48-bit serial number, 8-bit CRC
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* @note This command can only be used if there is a single DS18B20 on the bus.
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* If multiple slaves are present, a data collision will occur(a wired AND result).
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* @param buf a 8-byte buffer
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*/
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void DS18B20_ReadRom(uint8_t *buf);
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/**
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* @brief Select a slave on the bus
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* @note Only the slave that exactly matches the 64-bit ROM code sequence will respond to
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* the function command issued by the master; all other slaves on the bus will wait
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* for a reset pulse.
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* @param addr 64-bit ROM code
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*/
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void DS18B20_Select(const uint8_t* addr);
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/**
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* @brief Start conversion on selected slave
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* @param addr 64-bit ROM code
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*/
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void DS18B20_Start(const uint8_t *addr);
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/**
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* @brief Read SRAM scratchpad from selected slave
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*
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* @param addr 64-bit ROM code
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* @param buf a 9-byte buffer, Byte 8 contains the CRC code for bytes 0 through 7
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*/
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void DS18B20_ReadScratchpadFromAddr(const uint8_t *addr, uint8_t *buf);
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/**
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* @brief Perform one ROM search
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* @param buff 8-byte array for ROM bytes
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* @param stack 8-byte array for search stack
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* @param split_point deepest split point of last search
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* @return new split point
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*/
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uint8_t DS18B20_Detect(uint8_t *buff, uint8_t *stack, uint8_t split_point);
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#endif // __DS18B20_H_
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