mirror of
https://github.com/espressif/esp-idf.git
synced 2024-10-05 20:47:46 -04:00
77 lines
2.9 KiB
C
77 lines
2.9 KiB
C
/*
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* SPDX-FileCopyrightText: 2022-2023 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Unlicense OR CC0-1.0
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*/
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#include "freertos/FreeRTOS.h"
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#include "freertos/task.h"
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#include "esp_log.h"
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#include "esp_check.h"
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#include "onewire_bus.h"
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#include "ds18b20.h"
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static const char *TAG = "example";
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#define EXAMPLE_ONEWIRE_BUS_GPIO 0
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#define EXAMPLE_ONEWIRE_MAX_DS18B20 2
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void app_main(void)
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{
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// install new 1-wire bus
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onewire_bus_handle_t bus;
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onewire_bus_config_t bus_config = {
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.bus_gpio_num = EXAMPLE_ONEWIRE_BUS_GPIO,
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};
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onewire_bus_rmt_config_t rmt_config = {
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.max_rx_bytes = 10, // 1byte ROM command + 8byte ROM number + 1byte device command
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};
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ESP_ERROR_CHECK(onewire_new_bus_rmt(&bus_config, &rmt_config, &bus));
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ESP_LOGI(TAG, "1-Wire bus installed on GPIO%d", EXAMPLE_ONEWIRE_BUS_GPIO);
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int ds18b20_device_num = 0;
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ds18b20_device_handle_t ds18b20s[EXAMPLE_ONEWIRE_MAX_DS18B20];
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onewire_device_iter_handle_t iter = NULL;
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onewire_device_t next_onewire_device;
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esp_err_t search_result = ESP_OK;
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// create 1-wire device iterator, which is used for device search
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ESP_ERROR_CHECK(onewire_new_device_iter(bus, &iter));
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ESP_LOGI(TAG, "Device iterator created, start searching...");
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do {
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search_result = onewire_device_iter_get_next(iter, &next_onewire_device);
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if (search_result == ESP_OK) { // found a new device, let's check if we can upgrade it to a DS18B20
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ds18b20_config_t ds_cfg = {};
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if (ds18b20_new_device(&next_onewire_device, &ds_cfg, &ds18b20s[ds18b20_device_num]) == ESP_OK) {
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ESP_LOGI(TAG, "Found a DS18B20[%d], address: %016llX", ds18b20_device_num, next_onewire_device.address);
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ds18b20_device_num++;
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if (ds18b20_device_num >= EXAMPLE_ONEWIRE_MAX_DS18B20) {
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ESP_LOGI(TAG, "Max DS18B20 number reached, stop searching...");
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break;
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}
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} else {
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ESP_LOGI(TAG, "Found an unknown device, address: %016llX", next_onewire_device.address);
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}
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}
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} while (search_result != ESP_ERR_NOT_FOUND);
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ESP_ERROR_CHECK(onewire_del_device_iter(iter));
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ESP_LOGI(TAG, "Searching done, %d DS18B20 device(s) found", ds18b20_device_num);
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// set resolution for all DS18B20s
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for (int i = 0; i < ds18b20_device_num; i++) {
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// set resolution
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ESP_ERROR_CHECK(ds18b20_set_resolution(ds18b20s[i], DS18B20_RESOLUTION_12B));
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}
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// get temperature from sensors one by one
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float temperature;
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while (1) {
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vTaskDelay(pdMS_TO_TICKS(200));
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for (int i = 0; i < ds18b20_device_num; i ++) {
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ESP_ERROR_CHECK(ds18b20_trigger_temperature_conversion(ds18b20s[i]));
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ESP_ERROR_CHECK(ds18b20_get_temperature(ds18b20s[i], &temperature));
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ESP_LOGI(TAG, "temperature read from DS18B20[%d]: %.2fC", i, temperature);
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}
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}
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}
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