mirror of
https://github.com/eddyem/stm32samples.git
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137 lines
3.9 KiB
C
137 lines
3.9 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 "main.h"
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#include "hardware_ini.h"
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#define TIM2_DMABUFF_SIZE 128
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// freq = 1MHz
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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 ((uint16_t)1000)
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#define BIT_LEN ((uint16_t)100)
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#define RESET_P ((uint16_t)500)
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#define BIT_ONE_P ((uint16_t)10)
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#define BIT_ZERO_P ((uint16_t)60)
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#define BIT_READ_P ((uint16_t)5)
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#define RESET_BARRIER ((uint16_t)550)
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#define ONE_ZERO_BARRIER ((uint16_t)10)
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#define ERR_TEMP_VAL (200000)
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typedef struct{
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uint8_t bytes[8];
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} OW_ID;
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extern OW_ID id_array[];
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#define OW_MAX_NUM 8
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void init_ow_dmatimer();
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void run_dmatimer();
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extern uint8_t ow_done;
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#define OW_READY() (ow_done)
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void ow_dma_on();
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uint8_t OW_add_byte(uint8_t ow_byte);
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uint8_t OW_add_read_seq(uint8_t Nbytes);
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void read_from_OWbuf(uint8_t start_idx, uint8_t N, uint8_t *outbuf);
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void ow_reset();
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uint8_t OW_get_reset_status();
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extern int tum2buff_ctr;
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#define OW_reset_buffer() do{tum2buff_ctr = 0;}while(0)
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extern uint8_t ow_data_ready;
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#define OW_DATA_READY() (ow_data_ready)
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#define OW_CLEAR_READY_FLAG() do{ow_data_ready = 0;}while(0)
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void OW_process();
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void OW_fill_next_ID();
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void OW_send_read_seq();
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uint8_t OW_Send(uint8_t sendReset, uint8_t *command, uint8_t cLen);
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extern int32_t temperature;
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extern int8_t Ncur;
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void OW_read_next_temp();
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#define OW_current_temp() (temperature)
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#define OW_current_num() (Ncur)
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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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* 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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* 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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