Add clear version of commit 72f30ad.

extras/ds18b20/LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2016 Grzegorz Hetman : ghetman@gmail.com
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+

extras/ds18b20/component.mk

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+# Component makefile for extras/ds18b20
+
+# expected anyone using bmp driver includes it as 'ds18b20/ds18b20.h'
+INC_DIRS += $(ds18b20_ROOT)..
+
+# args for passing into compile rule generation
+ds18b20_SRC_DIR =  $(ds18b20_ROOT)
+
+$(eval $(call component_compile_rules,ds18b20))

extras/ds18b20/ds18b20.c

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+#include "onewire/onewire.h"
+#include "ds18b20.h"
+
+#define DS1820_WRITE_SCRATCHPAD 0x4E
+#define DS1820_READ_SCRATCHPAD  0xBE
+#define DS1820_COPY_SCRATCHPAD  0x48
+#define DS1820_READ_EEPROM      0xB8
+#define DS1820_READ_PWRSUPPLY   0xB4
+#define DS1820_SEARCHROM        0xF0
+#define DS1820_SKIP_ROM         0xCC
+#define DS1820_READROM          0x33
+#define DS1820_MATCHROM         0x55
+#define DS1820_ALARMSEARCH      0xEC
+#define DS1820_CONVERT_T        0x44
+
+uint8_t readDS18B20(uint8_t pin, ds_sensor_t *result){
+    
+    uint8_t addr[8];
+    uint8_t sensor_id = 0;
+    onewire_reset_search(pin);
+    
+    while(onewire_search(pin, addr)){
+        uint8_t crc = onewire_crc8(addr, 7);
+        if (crc != addr[7]){
+            printf("CRC check failed: %02X %02X\n", addr[7], crc);
+            return 0;
+        }
+
+        onewire_reset(pin);
+        onewire_select(pin, addr);
+        onewire_write(pin, DS1820_CONVERT_T, ONEWIRE_DEFAULT_POWER);
+        sdk_os_delay_us(750);
+        onewire_reset(pin);
+        onewire_select(pin, addr);
+        onewire_write(pin, DS1820_READ_SCRATCHPAD, ONEWIRE_DEFAULT_POWER);
+
+        uint8_t get[10];
+
+        for (int k=0;k<9;k++){
+            get[k]=onewire_read(pin);
+        }
+        
+        //printf("\n ScratchPAD DATA = %X %X %X %X %X %X %X %X %X\n",get[8],get[7],get[6],get[5],get[4],get[3],get[2],get[1],get[0]);
+        crc = onewire_crc8(get, 8);
+
+        if (crc != get[8]){
+            printf("CRC check failed: %02X %02X\n", get[8], crc);
+            return 0;
+        }
+
+        uint8_t temp_msb = get[1]; // Sign byte + lsbit
+        uint8_t temp_lsb = get[0]; // Temp data plus lsb
+        uint16_t temp = temp_msb << 8 | temp_lsb;
+        
+        float temperature;
+
+        temperature = (temp * 625.0)/10000;
+        //printf("Got a DS18B20 Reading: %d.%d\n", (int)temperature, (int)(temperature - (int)temperature) * 100);
+        result[sensor_id].id = sensor_id;
+        result[sensor_id].major = (int)temperature;
+        result[sensor_id].minor = (int)(temperature) - (int)temperature * 100;
+        sensor_id++;
+    }
+    return sensor_id;
+}
+
+float read_single_DS18B20(uint8_t pin){
+  
+    onewire_init(pin);
+    onewire_reset(pin);
+
+    onewire_write(pin, DS1820_SKIP_ROM, ONEWIRE_DEFAULT_POWER);
+    onewire_write(pin, DS1820_CONVERT_T, ONEWIRE_DEFAULT_POWER);
+
+    sdk_os_delay_us(750);
+
+    onewire_reset(pin);
+    onewire_write(pin, DS1820_SKIP_ROM, ONEWIRE_DEFAULT_POWER);
+    onewire_write(pin, DS1820_READ_SCRATCHPAD, ONEWIRE_DEFAULT_POWER);
+    
+    uint8_t get[10];
+
+    for (int k=0;k<9;k++){
+        get[k]=onewire_read(pin);
+    }
+    
+    //printf("\n ScratchPAD DATA = %X %X %X %X %X %X %X %X %X\n",get[8],get[7],get[6],get[5],get[4],get[3],get[2],get[1],get[0]);
+    uint8_t crc = onewire_crc8(get, 8);
+
+    if (crc != get[8]){
+        printf("CRC check failed: %02X %02X", get[8], crc);
+        return 0;
+    }
+
+    uint8_t temp_msb = get[1]; // Sign byte + lsbit
+    uint8_t temp_lsb = get[0]; // Temp data plus lsb
+    
+    uint16_t temp = temp_msb << 8 | temp_lsb;
+    
+    float temperature;
+
+    temperature = (temp * 625.0)/10000;
+    return temperature;
+    //printf("Got a DS18B20 Reading: %d.%d\n", (int)temperature, (int)(temperature - (int)temperature) * 100);
+}

extras/ds18b20/ds18b20.h

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+#ifndef DRIVER_DS18B20_H_
+#define DRIVER_DS18B20_H_
+
+typedef struct {
+	uint8_t id;
+    uint8_t major;
+    uint8_t minor;
+} ds_sensor_t;
+
+// Scan all ds18b20 sensors on bus and return its amount.
+// Result are saved in array of ds_sensor_t structure.
+// Cause printf in esp sdk don`t support float,
+// I split result as two number (major, minor).
+uint8_t readDS18B20(uint8_t pin, ds_sensor_t *result);
+
+// This method is just to demonstrate how to read 
+// temperature from single dallas chip.
+float read_single_DS18B20(uint8_t pin);
+
+#endif