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examples/ds18b20_onewire/LICENSE
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examples/ds18b20_onewire/LICENSE
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The MIT License (MIT)
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Copyright (c) 2016 Grzegorz Hetman : ghetman@gmail.com
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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examples/ds18b20_onewire/Makefile
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examples/ds18b20_onewire/Makefile
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PROGRAM=ds18b20_onewire
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EXTRA_COMPONENTS = extras/onewire extras/ds18b20
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include ../../common.mk
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examples/ds18b20_onewire/ds18b20_onewire.c
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examples/ds18b20_onewire/ds18b20_onewire.c
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/* ds18b20 - Retrieves temperature from ds18b20 sensors and print it out.
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*
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* This sample code is in the public domain.,
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*/
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#include "espressif/esp_common.h"
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#include "esp/uart.h"
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#include "FreeRTOS.h"
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#include "task.h"
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#include "timers.h"
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#include "queue.h"
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// DS18B20 driver
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#include "ds18b20/ds18b20.h"
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// Onewire init
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#include "onewire/onewire.h"
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void print_temperature(void *pvParameters)
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{
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int delay = 500;
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uint8_t amount = 0;
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// Declare amount of sensors
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uint8_t sensors = 2;
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ds_sensor_t t[sensors];
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// Use GPIO 13 as one wire pin.
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uint8_t GPIO_FOR_ONE_WIRE = 13;
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onewire_init(GPIO_FOR_ONE_WIRE);
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while(1) {
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// Search all DS18B20, return its amount and feed 't' structure with result data.
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amount = readDS18B20(GPIO_FOR_ONE_WIRE, t);
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if (amount < sensors){
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printf("Something is wrong, I expect to see %d sensors \nbut just %d was detected!\n", sensors, amount);
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}
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for (int i = 0; i < amount; ++i)
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{
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// Multiple "" here is just to satisfy compiler and don`t raise 'hex escape sequence out of range' warning.
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printf("Sensor %d report: %d.%d ""\xC2""\xB0""C\n",t[i].id, t[i].major, t[i].minor);
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}
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printf("\n");
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vTaskDelay(delay / portTICK_RATE_MS);
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}
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}
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void user_init(void)
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{
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uart_set_baud(0, 115200);
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printf("SDK version:%s\n", sdk_system_get_sdk_version());
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xTaskCreate(&print_temperature, (signed char *)"print_temperature", 256, NULL, 2, NULL);
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}
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