BMP280 pressure sensor driver draft implementation.

examples/bmp280/Makefile

@@ -0,0 +1,3 @@
+PROGRAM=BMP280_example
+EXTRA_COMPONENTS = extras/i2c extras/bmp280
+include ../../common.mk

examples/bmp280/bmp280_example.c

@@ -0,0 +1,49 @@
+#include <stdio.h>
+
+#include "espressif/esp_common.h"
+#include "esp/uart.h"
+
+#include "FreeRTOS.h"
+#include "task.h"
+
+#include "bmp280/bmp280.h"
+
+
+const uint8_t scl_pin = 5;
+const uint8_t sda_pin = 4;
+
+
+static void bmp280_task(void *pvParameters)
+{
+    bmp280_params_t  params;
+    float pressure, temperature;
+
+    bmp280_init_default_params(&params);
+    while (1) {
+        while (!bmp280_init(&params, scl_pin, sda_pin)) {
+            printf("BMP280 initialization failed\n");
+            vTaskDelay(1000 / portTICK_RATE_MS);
+        }
+
+        while(1) {
+            vTaskDelay(1000 / portTICK_RATE_MS);
+            if (!bmp280_read(&temperature, &pressure)) {
+                printf("Temperature/pressure reading failed\n");
+                break;
+            }
+            printf("Pressure: %.2f Pa, Temperature: %.2f C\n", pressure, temperature);
+        }
+    }
+}
+
+void user_init(void)
+{
+    uart_set_baud(0, 115200);
+
+    // Just some information
+    printf("\n");
+    printf("SDK version : %s\n", sdk_system_get_sdk_version());
+    printf("GIT version : %s\n", GITSHORTREV);
+
+    xTaskCreate(bmp280_task, (signed char *)"bmp280_task", 256, NULL, 2, NULL);
+}