From 3bf41e40fe41cc3ca98191ae336bc4df62b48e4a Mon Sep 17 00:00:00 2001
From: Wolfgang Hottgenroth <wolfgang.hottgenroth@icloud.com>
Date: Sat, 31 May 2025 16:52:57 +0100
Subject: [PATCH] renamed and led test

---
 README.md        | 23 +++++++++++++++++++++++
 driver/Makefile  |  2 +-
 driver/counter.c | 21 +++++++++++++++++++++
 driver/hello.c   | 21 ---------------------
 4 files changed, 45 insertions(+), 22 deletions(-)
 create mode 100644 driver/counter.c
 delete mode 100644 driver/hello.c

diff --git a/README.md b/README.md
index efa611b..03461d1 100644
--- a/README.md
+++ b/README.md
@@ -33,4 +33,27 @@ apt install build-essential raspberrypi-kernel-headers git
 ```
 
 
+## Test LEDs:
 
+
+GPIO26 is red, GPIO21 is blue:
+
+Blue on:
+```
+pinctrl set 21 op dh
+```
+
+Blue off:
+```
+pinctrl set 21 op dl
+```
+
+Red on:
+```
+pinctrl set 26 op dh
+```
+
+Red off:
+```
+pinctrl set 26 op dl
+```
diff --git a/driver/Makefile b/driver/Makefile
index e531ee8..1233a6e 100644
--- a/driver/Makefile
+++ b/driver/Makefile
@@ -1,4 +1,4 @@
-obj-m += hello.o
+obj-m += counter.o
 
 KDIR := /lib/modules/$(shell uname -r)/build
 PWD  := $(shell pwd)
diff --git a/driver/counter.c b/driver/counter.c
new file mode 100644
index 0000000..fd8c378
--- /dev/null
+++ b/driver/counter.c
@@ -0,0 +1,21 @@
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/init.h>
+
+static int __init counter_init(void) {
+    pr_info("counter: LKM loaded.\n");
+    return 0;
+}
+
+static void __exit counter_exit(void) {
+    pr_info("counter: LKM unloaded.\n");
+}
+
+module_init(counter_init);
+module_exit(counter_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("Wolfgang Hottgenroth <wolfgang.hottgenroth@icloud.com>");
+MODULE_DESCRIPTION("LKM for MainsCnt counter module");
+MODULE_VERSION("0.1");
+
diff --git a/driver/hello.c b/driver/hello.c
deleted file mode 100644
index 3e4c43d..0000000
--- a/driver/hello.c
+++ /dev/null
@@ -1,21 +0,0 @@
-#include <linux/module.h>
-#include <linux/kernel.h>
-#include <linux/init.h>
-
-static int __init hello_init(void) {
-    pr_info("hello: Modul wurde geladen.\n");
-    return 0;
-}
-
-static void __exit hello_exit(void) {
-    pr_info("hello: Modul wurde entladen.\n");
-}
-
-module_init(hello_init);
-module_exit(hello_exit);
-
-MODULE_LICENSE("GPL");
-MODULE_AUTHOR("Du");
-MODULE_DESCRIPTION("Minimales Kernelmodul-Beispiel");
-MODULE_VERSION("0.1");
-