DS1307 RTC driver + example

examples/ds1307/Makefile

@@ -0,0 +1,3 @@
+PROGRAM = ds1307
+EXTRA_COMPONENTS = extras/i2c extras/ds1307
+include ../../common.mk

examples/ds1307/main.c

@@ -0,0 +1,45 @@
+/*
+ * Example of using DS1307 RTC driver
+ *
+ * Part of esp-open-rtos
+ * Copyright (C) 2016 Ruslan V. Uss <unclerus@gmail.com>
+ * BSD Licensed as described in the file LICENSE
+ */
+#include <esp/uart.h>
+#include <espressif/esp_common.h>
+#include <i2c/i2c.h>
+#include <ds1307/ds1307.h>
+#include <stdio.h>
+
+#define SCL_PIN 5
+#define SDA_PIN 4
+
+void user_init (void)
+{
+    uart_set_baud (0, 115200);
+    printf ("SDK version:%s\n", sdk_system_get_sdk_version ());
+
+    i2c_init (SCL_PIN, SDA_PIN);
+    ds1307_start (true);
+
+    // setup datetime: 2016-10-09 13:50:10
+    struct tm time = {
+        .tm_year = 2016,
+        .tm_mon = 10,
+        .tm_mday = 9,
+        .tm_hour = 13,
+        .tm_min = 50,
+        .tm_sec = 10
+    };
+    ds1307_set_time (&time);
+
+    while (true)
+    {
+        ds1307_get_time (&time);
+
+        printf ("%04d-%02d-%02d %02d:%02d:%02d\n", time.tm_year, time.tm_mon, time.tm_mday, time.tm_hour, time.tm_min, time.tm_sec);
+
+        for (uint32_t i = 0; i < 1000; i ++)
+            sdk_os_delay_us (500);
+    }
+}