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