Merge pull request #77 from jcard0na/master

Initial PWM implementation from gpascualg

examples/pwm_test/Makefile

@@ -0,0 +1,4 @@
+# Simple makefile for simple example
+PROGRAM=pwm_test
+COMPONENTS = FreeRTOS lwip core extras/pwm
+include ../../common.mk

examples/pwm_test/pwm_test.c

@@ -0,0 +1,50 @@
+/* Very basic example to test the pwm library
+ * Hook up an LED to pin14 and you should see the intensity change
+ *
+ * Part of esp-open-rtos
+ * Copyright (C) 2015 Javier Cardona (https://github.com/jcard0na)
+ * BSD Licensed as described in the file LICENSE
+ */
+#include "espressif/esp_common.h"
+#include "esp/uart.h"
+#include "FreeRTOS.h"
+#include "task.h"
+#include "pwm.h"
+
+void task1(void *pvParameters)
+{
+    printf("Hello from task1!\r\n");
+    uint32_t const init_count = 0;
+    uint32_t count = init_count;
+    while(1) {
+        vTaskDelay(100);
+        printf("duty cycle set to %d/UINT16_MAX%%\r\n", count);
+        pwm_set_duty(count);
+        count += UINT16_MAX/17;
+        if (count > UINT16_MAX)
+            count = init_count;
+    }
+}
+
+void user_init(void)
+{
+    uint8_t pins[1];
+    uart_set_baud(0, 115200);
+
+    printf("SDK version:%s\n", sdk_system_get_sdk_version());
+
+    printf("pwm_init(1, [14])\n");
+    pins[0] = 14;
+    pwm_init(1, pins);
+
+    printf("pwm_set_freq(1000)     # 1 kHz\n");
+    pwm_set_freq(1000);
+
+    printf("pwm_set_duty(UINT16_MAX/2)     # 50%%\n");
+    pwm_set_duty(UINT16_MAX/2);
+
+    printf("pwm_start()\n");
+    pwm_start();
+
+    xTaskCreate(task1, (signed char *)"tsk1", 256, NULL, 2, NULL);
+}