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114 lines
3.4 KiB
C
114 lines
3.4 KiB
C
/*
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* onewire.h
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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 "stm32f10x.h"
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#include "includes.h"
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// 1-wire status
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#define OW_OK (1)
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#define OW_ERROR (2)
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#define OW_NO_DEVICE (3)
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#define OW_NO_READ (0xff)
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#define OW_READ_SLOT (uint8_t*)"0xff"
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void OW_Init();
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uint8_t OW_Send(uint8_t sendReset, uint8_t *command, uint8_t cLen,
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uint8_t *data, uint8_t dLen, uint8_t readStart);
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uint8_t OW_Scan(uint8_t *buf, uint8_t num);
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// shortcuts for functions
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// only send message b wich length is c with RESET flag a
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#define OW_SendOnly(a,b,c) OW_Send(a, b, c, (void*)0, 0, OW_NO_READ)
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// send 1 command (with bus reset)
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#define OW_WriteCmd(cmd) OW_Send(1, cmd, 1, (void*)0, 0, OW_NO_READ)
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// send 1 function (without bus reset)
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#define OW_WriteFn(cmd) OW_Send(0, cmd, 1, (void*)0, 0, OW_NO_READ)
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/*
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* thermometer identificator is: 8bits CRC, 48bits serial, 8bits device code (10h)
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* Critical temperatures is T_H and T_L
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* T_L is lowest allowed temperature
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* T_H is highest -//-
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* format T_H and T_L: 1bit sigh + 7bits of data
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*/
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/*
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* thermometer commands (DS18S20)\
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* send them with bus reset!
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*/
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// find devices
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#define T_SEARCH_ROM (0xf0)
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#define OW_SEARCH_ROM (uint8_t*)"\xf0"
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// read device (when it is alone on the bus)
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#define T_READ_ROM (0x33)
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#define OW_READ_ROM (uint8_t*)"\x33"
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// send device ID (after this command - 8 bytes of ID)
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#define T_MATCH_ROM (0x55)
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#define OW_MATCH_ROM (uint8_t*)"\x55"
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// broadcast command
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#define T_SKIP_ROM (0xcc)
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#define OW_SKIP_ROM (uint8_t*)"\xcc"
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// find devices with critical conditions
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#define T_ALARM_SEARCH (0xec)
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#define OW_ALARM_SEARCH (uint8_t*)"\xec"
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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 T_CONVERT_T (0x44)
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#define OW_CONVERT_T (uint8_t*)"\x44"
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// write critical temperature to device's RAM
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#define T_SCRATCHPAD (0x4e)
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#define OW_SCRATCHPAD (uint8_t*)"\x4e"
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// read whole device flash
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#define T_READ_SCRATCHPAD (0xbe)
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#define OW_READ_SCRATCHPAD (uint8_t*)"\xbe"
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// copy critical themperature from device's RAM to its EEPROM
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#define T_COPY_SCRATCHPAD (0x48)
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#define OW_COPY_SCRATCHPAD (uint8_t*)"\x48"
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// copy critical themperature from EEPROM to RAM (when power on this operation runs automatically)
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#define T_RECALL_E2 (0xb8)
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#define OW_RECALL_E2 (uint8_t*)"\xb8"
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// check whether there is devices wich power up from bus
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#define T_READ_POWER_SUPPLY (0xb4)
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#define OW_READ_POWER_SUPPLY (uint8_t*)"\xb4"
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/*
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* RAM register:
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* 0 - themperature: 1 ADU == 0.5 degrC
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* 1 - sign (0 - T>0 degrC ==> T=byte0; 1 - T<0 degrC ==> T=byte0-0xff+1)
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* 2 - T_H
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* 3 - T_L
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* 4 - 0xff (reserved)
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* 5 - 0xff (reserved)
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* 6 - 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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#endif // __ONEWIRE_H__
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