From 220397d6e51dd15d74fbd41cfdc9c72aced45119 Mon Sep 17 00:00:00 2001
From: guowenxue <guowenxue@gmail.com>
Date: Wed, 03 Nov 2021 22:29:44 +0800
Subject: [PATCH] update led and gpio program
---
modules/c/led.c | 106 +++++++++++++++++++++++++++++++++++++---------------
1 files changed, 75 insertions(+), 31 deletions(-)
diff --git a/modules/c/led.c b/modules/c/led.c
index 514dd85..3097381 100644
--- a/modules/c/led.c
+++ b/modules/c/led.c
@@ -1,21 +1,21 @@
/*********************************************************************************
- * Copyright: (C) 2018 LingYun IoT System Studio
+ * Copyright: (C) 2021 LingYun IoT System Studio
* All rights reserved.
*
* Filename: led.c
- * Description: This file is used to control RGB 3-colours LED
+ * Description: This file is used to control RGB 3-colors LED
*
- * pi@raspberrypi:~ $ gpio readall show BCM and wPi pinmap
+ * pi@raspberrypi:~ $ gpio readall #show RPi pin map
*
- * LED BCM wPi
- * B ---- GPIO.13 ---- GPIO.23
- * R ---- GPIO.19 ---- GPIO.24
- * G ---- GPIO.26 ---- GPIO.25
- * I ---- GND ----
+ * LED #PIN BCM
+ * I ---- 39 ---- GND
+ * G ---- 37 ---- 26
+ * R ---- 35 ---- 19
+ * B ---- 33 ---- 13
*
- * Version: 1.0.0(2018/10/14)
+ * Version: 1.0.0(2012/11/03)
* Author: Guo Wenxue <guowenxue@gmail.com>
- * ChangeLog: 1, Release initial version on "2018/10/14 12:13:26"
+ * ChangeLog: 1, Release initial version on "2021/11/03 12:13:26"
*
********************************************************************************/
@@ -28,12 +28,28 @@
#include <time.h>
#include <errno.h>
-#include <wiringPi.h>
-#include "led.h"
+#include <gpiod.h>
#define msleep(x) usleep( 1000*(x) )
-
#define DELAY 500
+
+#define ON 1
+#define OFF 0
+
+/* Three LEDs code */
+enum
+{
+ LED_R = 0,
+ LED_G,
+ LED_B,
+ LED_MAX,
+};
+
+/* RGB 3-color LED BCM pin number */
+static int led_gpio[LED_MAX]= { 19, 26, 13 };
+
+void init_led(void);
+int turn_led(int which, int cmd);
int main(int argc, char *argv[])
{
@@ -42,48 +58,76 @@
while(1)
{
turn_led(LED_R, ON);
- msleep(DELAY);
turn_led(LED_R, OFF);
- msleep(DELAY);
turn_led(LED_G, ON);
- msleep(DELAY);
turn_led(LED_G, OFF);
- msleep(DELAY);
turn_led(LED_B, ON);
- msleep(DELAY);
turn_led(LED_B, OFF);
- msleep(DELAY);
}
return 0;
}
+
+#if 1 /* Use libgpiod lowlevel API */
+
+struct gpiod_chip* chip;
+
void init_led(void)
{
- int i;
-
- wiringPiSetup();
-
- for(i=0; i<LED_MAX; i++)
+ chip = gpiod_chip_open_by_name("gpiochip0");
+ if( !chip )
{
- pinMode( led_gpio[i], OUTPUT );
+ printf("gpiod open chip failure, maybe you need running as root\n");
+ exit(1);
}
}
int turn_led(int which, int cmd)
{
- if( which<0 || which>=LED_MAX )
- return -1;
-
+ int rv = 0;
+ struct gpiod_line* line;
+
+ line = gpiod_chip_get_line(chip, led_gpio[which]);
+ if( !line )
+ {
+ rv = -2;
+ }
+
+ gpiod_line_request_output(line, "led", 0);
if( OFF == cmd )
- digitalWrite (led_gpio[which], LOW);
+ {
+ gpiod_line_set_value(line, 0);
+ }
else
- digitalWrite (led_gpio[which], HIGH);
+ {
+ gpiod_line_set_value(line, 1);
+ }
- return 0;
+ msleep(DELAY);
}
+#else /* use libgpiod ctxless high level API */
+void init_led(void)
+{
+}
+
+static void gpiod_ctxless_cb(void *data)
+{
+ sleep(1);
+}
+
+int turn_led(int which, int cmd)
+{
+ if( OFF == cmd )
+ gpiod_ctxless_set_value("gpiochip0", led_gpio[which], 0, false, "led", gpiod_ctxless_cb, NULL);
+ else
+ gpiod_ctxless_set_value("gpiochip0", led_gpio[which], 1, false, "led", gpiod_ctxless_cb, NULL);
+}
+#endif
+
+
--
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