samples: pwm: adapt to new api argument definition

Change the api argument format following the API
argument definition change in the driver. Some
definitions of CONSTANTs were changed accordingly.

Correct some comment error.

Jira: ZEP-642

Change-Id: I1b34640aa70f1597076e035e2b3b576d8337129a
Signed-off-by: Baohong Liu <[email protected]>

Author: bliu11-intel

samples/drivers/pwm/src/main.c

@@ -28,7 +28,8 @@
  * The sample runs like this on PWM[0] (IO3):
  * 1. At first, the period for the PWM is 1 second on, 1 second off.
  * 2. Every 4 seconds, the period is halved.
- * 3. After the period is faster than 10ms, period starts to double.
+ * 3. After the period is faster than 1 ms on and 1 ms off, period
+ *    starts to double.
  * 4. Every 4 seconds, period is doubled.
  * 5. When period is longer than 1 seconds, repeat from 2.
  *
@@ -44,11 +45,20 @@
 #include <pwm.h>
 #include <sys_clock.h>
 
-/* about 1 ms */
-#define MIN_PERIOD	32000
+#define HW_CLOCK_CYCLES_PER_USEC  (CONFIG_SYS_CLOCK_HW_CYCLES_PER_SEC / \
+				   USEC_PER_SEC)
 
-/* about 1 second */
-#define MAX_PERIOD	32000000
+/**
+ * unit: micro second.
+ * 1 m sec for "on" or "off" time.
+ */
+#define MIN_PERIOD	1000
+
+/**
+ * unit: micro second.
+ * 1 sec for "on" or "off" time
+ */
+#define MAX_PERIOD	1000000
 
 #define SLEEPTICKS	SECONDS(4)
 
@@ -69,25 +79,34 @@ void main(void)
 		printk("Cannot find PWM_0!\n");
 	}
 
-	period = MAX_PERIOD;
+	period = MAX_PERIOD * 2;
 	dir = 0;
 
 	while (1) {
-		pwm_pin_set_values(pwm_dev, 0, period, period);
+		if (pwm_pin_set_period(pwm_dev, 0, period)) {
+			printk("set period fails\n");
+			return;
+		}
+
+		if (pwm_pin_set_values(pwm_dev, 0, 0,
+				(period * HW_CLOCK_CYCLES_PER_USEC) / 2)) {
+			printk("set values fails\n");
+			return;
+		}
 
 		if (dir) {
 			period *= 2;
 
-			if (period > MAX_PERIOD) {
+			if (period > (MAX_PERIOD * 2)) {
 				dir = 0;
-				period = MAX_PERIOD;
+				period = MAX_PERIOD * 2;
 			}
 		} else {
 			period /= 2;
 
-			if (period < MIN_PERIOD) {
+			if (period < (MIN_PERIOD * 2)) {
 				dir = 1;
-				period = MIN_PERIOD;
+				period = MIN_PERIOD * 2;
 			}
 		}