mirror of
https://github.com/eddyem/STM8_samples.git
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147 lines
4.2 KiB
C
147 lines
4.2 KiB
C
/*
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* onewire.h
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*
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* Copyright 2015 Edward V. Emelianoff <eddy@sao.ru, edward.emelianoff@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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* MA 02110-1301, USA.
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*/
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#pragma once
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#ifndef __ONEWIRE_H__
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#define __ONEWIRE_H__
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#include "stm8l.h"
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#define ERR_TEMP_VAL 200000
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#define TIM2REGH(reg) TIM2_##reg##H
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#define TIM2REGL(reg) TIM2_##reg##L
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#define TIM2REG(reg, val) do{TIM2REGH(reg) = val >> 8; TIM2REGL(reg) = val & 0xff;}while(0)
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// ARR values: 1000 for reset, 100 for data in/out
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// CCR2 values: 500 for reset, 60 for sending 0 or reading, <15 for sending 1
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// CCR1 values: >550 if there's devices on line (on reset), >12 (typ.15) - read 0, < 12 (typ.1) - read 1
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#define RESET_LEN ((U16)1000)
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#define BIT_LEN ((U16)100)
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#define RESET_P ((U16)500)
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#define BIT_ONE_P ((U16)10)
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#define BIT_ZERO_P ((U16)60)
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#define BIT_READ_P ((U16)5)
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#define RESET_BARRIER ((U16)550)
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#define ONE_ZERO_BARRIER ((U16)10)
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#define OW_BUSY ((TIM2_CR1 & TIM_CR1_CEN))
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/*
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* thermometer commands
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* send them with bus reset!
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*/
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// find devices
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#define OW_SEARCH_ROM (0xf0)
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// read device (when it is alone on the bus)
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#define OW_READ_ROM (0x33)
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// send device ID (after this command - 8 bytes of ID)
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#define OW_MATCH_ROM (0x55)
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// broadcast command
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#define OW_SKIP_ROM (0xcc)
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// find devices with critical conditions
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#define OW_ALARM_SEARCH (0xec)
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/*
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* thermometer functions
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* send them without bus reset!
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*/
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// start themperature reading
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#define OW_CONVERT_T (0x44)
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// write critical temperature to device's RAM
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#define OW_SCRATCHPAD (0x4e)
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// read whole device flash
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#define OW_READ_SCRATCHPAD (0xbe)
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// copy critical themperature from device's RAM to its EEPROM
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#define OW_COPY_SCRATCHPAD (0x48)
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// copy critical themperature from EEPROM to RAM (when power on this operation runs automatically)
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#define OW_RECALL_E2 (0xb8)
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// check whether there is devices wich power up from bus
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#define OW_READ_POWER_SUPPLY (0xb4)
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/*
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* RAM register:
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* 0 - themperature LSB
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* 1 - themperature MSB (all higher bits are sign)
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* 2 - T_H
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* 3 - T_L
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* 4 - B20: Configuration register (only bits 6/5 valid: 9..12 bits resolution); 0xff for S20
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* 5 - 0xff (reserved)
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* 6 - (reserved for B20); S20: COUNT_REMAIN (0x0c)
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* 7 - COUNT PER DEGR (0x10)
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* 8 - CRC
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*
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* To identify S20/B20 use value of confuguration register: its MSbit is 0
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*/
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typedef enum{
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OW_MODE_OFF, // sleeping
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OW_MODE_TRANSMIT_N, // transmit N bytes
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OW_MODE_RECEIVE_N, // receive N bytes
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OW_MODE_RESET // reset bus
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} OW_modes;
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typedef struct{
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U8 is_free;
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U8 ROM_bytes[8];
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} ow_ROM;
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#define EEPROM_MAGICK (0x1234)
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// there's only 128 bytes of EEPROM on STM8S003!!!
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// so we have not more than 14 sensors!
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#define MAX_SENSORS (14)
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typedef struct{
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U16 magick;
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ow_ROM ROMs[MAX_SENSORS];
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} eeprom_data;
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extern U8 ROM[];
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extern eeprom_data *saved_data;
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extern volatile U8 ow_data; // byte to send/receive
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extern volatile U8 onewire_tick_ctr; // tick counter
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extern volatile U8 is_receiver;
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extern volatile U16 onewire_gotlen; // last captured value
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extern U8 ow_data_array[];
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extern U8 ow_byte_ctr;
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extern volatile OW_modes ow_mode;
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extern void (*ow_process_resdata)();
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void onewire_setup();
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U8 onewire_reset();
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void onewire_send_byte(U8 byte);
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void onewire_wait_for_receive();
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void process_onewire();
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void onewire_receive_bytes(U8 N);
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void onewire_send_bytes(U8 N);
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long gettemp();
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void eeprom_default_setup();
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U8 erase_saved_ROM(U8 num);
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U8 store_ROM();
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#endif // __ONEWIRE_H__
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