Initial commit

examples/ds18b20_temp/CMakeLists.txt

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+# Copyright 2017 Rafal Zajac <rzajac@gmail.com>.
+#
+# Licensed under the Apache License, Version 2.0 (the "License"); you may
+# not use this file except in compliance with the License. You may obtain
+# a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+# License for the specific language governing permissions and limitations
+# under the License.
+
+
+find_package(esp_sdo REQUIRED)
+find_package(esp_ow REQUIRED)
+find_package(esp_eb REQUIRED)
+find_package(esp_util REQUIRED)
+
+add_executable(ds18b20_temp main.c ${ESP_USER_CONFIG})
+
+target_include_directories(ds18b20_temp PUBLIC
+    ${ESP_USER_CONFIG_DIR}
+    ${esp_sdo_INCLUDE_DIRS}
+    ${esp_ow_INCLUDE_DIRS}
+    ${esp_eb_INCLUDE_DIRS}
+    ${esp_util_INCLUDE_DIRS})
+
+target_link_libraries(ds18b20_temp
+    ${esp_sdo_LIBRARIES}
+    ${esp_ow_LIBRARIES}
+    ${esp_eb_LIBRARIES}
+    ${esp_util_LIBRARIES}
+    esp_ds18b20)
+
+esp_gen_exec_targets(ds18b20_temp)

examples/ds18b20_temp/README.md

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+## Get temperature measured by DS18B20.
+
+Demonstrates how to search OneWire bus for DS18b20.
+
+## Flashing
+
+```
+$ cd build
+$ cmake ..
+$ make ds18b20_temp_flash
+$ miniterm.py /dev/ttyUSB0 74880
+```

examples/ds18b20_temp/main.c

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+/*
+ * Copyright 2017 Rafal Zajac <rzajac@gmail.com>.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may
+ * not use this file except in compliance with the License. You may obtain
+ * a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations
+ * under the License.
+ */
+
+
+#include <user_interface.h>
+#include <osapi.h>
+#include <esp_ds18b20.h>
+#include <esp_gpio.h>
+#include <esp_eb.h>
+#include <esp_sdo.h>
+#include <esp_util.h>
+
+// List of found devices on the OneWire bus.
+static esp_ow_device *root = NULL;
+
+
+// Handle temperature conversion callbacks.
+static void ICACHE_FLASH_ATTR
+temperature(const char *event, void *arg)
+{
+  esp_ow_device *dev = arg;
+  esp_ds18b20_st *st = dev->custom;
+
+  if (st->last_temp == ESP_DS18B20_TEMP_ERR) {
+    os_printf("Temperature read error.\n");
+  } else {
+    os_printf("Temperature: %s\n", esp_util_ftoa(st->last_temp, 4));
+  }
+}
+
+static void ICACHE_FLASH_ATTR
+sys_init_done()
+{
+  esp_ow_err err;
+
+  if (esp_ds18b20_init(GPIO2) == false) {
+    os_printf("Error initializing DS18B20.\n");
+    return;
+  }
+
+  err = esp_ds18b20_search(GPIO2, false, &root);
+  if (err != ESP_OW_OK) {
+    os_printf("Search error: %d\n", err);
+    return;
+  }
+
+  if (root == NULL) {
+    os_printf("No devices found.\n");
+  }
+
+  // Callbacks will be called when conversion is finished.
+  esp_eb_attach(ESP_DS18B20_EV_TEMP_READY, temperature);
+  esp_eb_attach(ESP_DS18B20_EV_TEMP_ERROR, temperature);
+
+  // Get temperature from the first DS18B20 sensor.
+  esp_ds18b20_convert(root);
+}
+
+void ICACHE_FLASH_ATTR
+user_init()
+{
+  // No need for wifi for this examples.
+  wifi_station_disconnect();
+  wifi_set_opmode_current(NULL_MODE);
+
+  stdout_init(BIT_RATE_74880);
+  system_init_done_cb(sys_init_done);
+}