Valentin.sidorov

01_git/Makefile

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+NAME = scissors
+
+SRC = scissors.c
+
+CFLAGS = -Wall -Wextra -Werror
+
+OBJ_DIR = obj
+OBJ = $(addprefix $(OBJ_DIR)/,$(SRC:.c=.o))
+
+.PHONY = all clean re
+
+all: $(OBJ_DIR) $(NAME)
+
+$(NAME): $(OBJ)
+	gcc $(CFLAGS) $^ -o $(NAME)
+
+$(addprefix $(OBJ_DIR),/%.o): %.c
+	gcc $(CFLAGS) $(DDFLAGS) -c $^ -o $@
+
+clean:
+	rm -rf $(OBJ_DIR) $(NAME)
+
+re:
+	make clean
+	make all
+
+$(OBJ_DIR):
+	mkdir -p $@

01_git/scissors.c

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+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+
+int main()
+{
+  char com;
+  int r;
+
+  srand(time(NULL));
+
+  printf("Please choose: rock (r) - paper (p) - scissors (s)");
+  com = getchar();
+  r = rand()%3;
+
+  if (com == 'r') printf("You choose rock, I choose " );
+  if (com == 'p') printf("You choose paper, I choose " );
+  if (com == 's') printf("You choose scissors, I choose ");
+
+  if (r  == 0) printf("rock.\n" );
+  if (r  == 1) printf("paper.\n" );
+  if (r  == 2) printf("scissors.\n");
+
+  if (com == 'r' &&  r  == 0) printf ("Draw game.\n" );
+  if (com == 'p' &&  r  == 1) printf ("Draw game.\n" );
+  if (com == 's' &&  r  == 2) printf ("Draw game.\n" );
+
+  if (com == 'r' &&  r  == 1) printf ("I win: paper beats rock.\n" );
+  if (com == 'p' &&  r  == 2) printf ("I win: scissors beats paper.\n" );
+  if (com == 's' &&  r  == 0) printf ("I win: rock beats scissors.\n" );
+
+  if (com == 'r' &&  r  == 2) printf ("You win: rock beats scissors.\n" );
+  if (com == 'p' &&  r  == 0) printf ("You win: paper beats rock.\n" );
+  if (com == 's' &&  r  == 1) printf ("You win: scissors beats paper.\n" );
+
+  getchar();
+  return 0;
+}

02_bash/devices.txt

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+
+ttyUSB :{
+
+}
+mmcblk :{
+
+}
+i2c :{
+i2c-0
+i2c-1
+i2c-2
+i2c-3
+i2c-4
+i2c-5
+
+}
+sd :{
+sda
+sda1
+sda2
+
+}

02_bash/hwdetech.sh

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+#!/bin/sh
+
+USB_UART="ttyUSB"
+MMCBLK="mmcblk"
+I2C="i2c"
+SD="sd"
+
+check_device()
+{
+    printf "\n$1 :{\n" >> devices.txt
+    ls /dev/ | grep $1 >> devices.txt
+    printf "\n}">> devices.txt
+}
+
+
+touch devices.txt
+touch tmp_devices.txt
+
+while [ 1 ]
+do
+    rm devices.txt
+    touch devices.txt
+    check_device $USB_UART
+    check_device $MMCBLK
+    check_device $I2C
+    check_device $SD
+    CHK_DVC=$(diff tmp_devices.txt devices.txt)
+
+    if [ "$CHK_DVC" != "" ]
+    then
+        cp devices.txt tmp_devices.txt
+	cat devices.txt
+    fi
+
+    sleep 1
+done

02_bash/tmp_devices.txt

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+
+ttyUSB :{
+
+}
+mmcblk :{
+
+}
+i2c :{
+i2c-0
+i2c-1
+i2c-2
+i2c-3
+i2c-4
+i2c-5
+
+}
+sd :{
+sda
+sda1
+sda2
+
+}

03_module/README.md

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+module home work: create a simple loadable module with parameters
+
+Create a loadadle kernel module which should accept two integer parameters and provide:
+
+    A sum of parameters upon driver load
+    A substration of parameters upon driver unload
+
+Info about module parameters can be found at: https://devarea.com/linux-kernel-development-kernel-module-parameters/#.YZfWcpFByV4
+
+Task should be performed using buildroot+qemu approach
+
+The task results should contain:
+
+    The module code
+    The Makefile
+    Dump of the kernel logs from the target system

03_module/my_modul/Makefile

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+#KERNELDIR ?= ~/soft/buildroot-2021.11-rc2/output/build/linux-5.15/
+#KERNELDIR ?= ~/soft/buildroot-2021.02/output/build/linux-5.10.10/
+# KERNELDIR ?= ~/soft/buildroot-2021.02/output/host/bin/
+# KERNELDIR ?= ~/soft/buildroot-2021.11-rc2/output_oranj/build/linux-5.12.2/
+
+KERNELDIR ?= ~/soft/buildroot-2021.02/temp_imeg/build/linux-5.10.10/
+ifneq ($(KERNELRELEASE),)
+  obj-m := modul_add.o
+else
+
+all:
+	$(MAKE) CFLAGS_MODULE="-DDEBUG -DORANGE_PI_ZERO" -C $(KERNELDIR) M=$(PWD) modules
+clean:
+	$(MAKE) -C $(KERNELDIR) M=$(PWD) clean
+endif
+

03_module/my_modul/Makefile_old

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+ifneq ($(KERNELRELEASE),)
+# kbuild part of makefile
+obj-m   := modul_add.o
+else
+# normal makefile
+KDIR ?= /lib/modules/`uname -r`/build
+
+default:
+	$(MAKE) -C $(KDIR) M=$$PWD
+move:
+	cd ../ && sudo cp -r 03_module /srv/nfs/busybox/tmp/
+clean:
+	$(MAKE) -C $(KDIR) M=$$PWD clean
+endif
+

03_module/my_modul/kernel-log.sh

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+#!/bin/sh
+
+# Simple script for generating logs for kernel module
+# with different parameters
+
+echo '[Hello it`s test for first Kernel module]'
+echo ' '
+echo '[With parameters]'
+sleep 0.1s
+insmod modul_add.ko znach_1=122  znach_2=133
+rmmod modul_add.ko
+
+echo ' '
+echo '[With one parameters]'
+sleep 0.1s 
+insmod modul_add.ko znach_1=-10    
+rmmod modul_add.ko
+
+echo ' '
+echo '[Without parameters]'
+sleep 0.1s
+insmod modul_add.ko
+rmmod modul_add.ko

03_module/my_modul/log_mod.txt

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+[Hello it`s test for first Kernel module]
+
+[With parameters]
+
+[With one parameters]
+
+[Without parameters]
+
+dmesg | grep 'znach'
+
+[ 3230.039347] znach_1 + znach_2 = 255
+[ 3230.042907] znach_1 - znach_2 = -11
+[ 3230.164680] znach_1 + znach_2 = 0
+[ 3230.168207] znach_1 - znach_2 = -20
+[ 3230.302357] znach_1 + znach_2 = 15
+[ 3230.305929] znach_1 - znach_2 = -5
+

03_module/my_modul/modul_add.c

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+#include <linux/kernel.h>
+#include <linux/module.h>
+
+static int znach_1 = 5;
+static int znach_2 = 10;
+
+module_param(znach_1, int, S_IRUSR | S_IRGRP);
+MODULE_PARM_DESC(znach_1, "the first module's parameter");
+module_param(znach_2, int, S_IRUSR | S_IRGRP);
+MODULE_PARM_DESC(znach_2, "the second module's parameter");
+
+int init_module(void)
+{
+	printk(KERN_INFO "znach_1 + znach_2 = %d\n", znach_1 + znach_2);
+
+	return 0;
+}
+
+void cleanup_module(void)
+{
+	printk(KERN_INFO "znach_1 - znach_2 = %d\n", znach_1 - znach_2);
+}
+
+MODULE_DESCRIPTION("My simple kernel module");
+MODULE_AUTHOR("Valentin S.");
+MODULE_LICENSE("GPL");
+MODULE_VERSION("0.1");

04_basic_srtuct/Log_basic_struct.txt

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+# insmod basic_struct.ko 
+# echo "123456" > /sys/kernel/basic_struct/list
+# at /sys/kernel/basic_struct/list
+-sh: at: not found
+# cat /sys/kernel/basic_struct/list
+123456
+# echo "Hello world 1" > /sys/kernel/basic_struct/list
+# cat /sys/kernel/basic_struct/list
+123456
+Hello world 1
+# echo "Hello world 2" > /sys/kernel/basic_struct/list
+# echo "Hello world 3" > /sys/kernel/basic_struct/list
+# cat /sys/kernel/basic_struct/list
+123456
+Hello world 1
+Hello world 2
+Hello world 3

04_basic_srtuct/Makefile

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+#KERNELDIR ?= ~/Development/Embedded/exercise8/buildroot_qemu_x64_image/build/linux-5.10.7/
+KERNELDIR ?= ~/soft/buildroot-2021.11-rc2/output/build/linux-5.15/
+CFLAGS_basic_struct.o := -DDEBUG
+obj-m += basic_struct.o
+
+all:
+	make -C $(KERNELDIR) M=$(PWD) modules
+clean:
+	make -C $(KERNELDIR) M=$(PWD) clean
+test:
+	sh test_S_mod.sh

04_basic_srtuct/README.md

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+Basic structure homework
+
+Implement object with name “MyObject” which is parent of kernel_kobj.
+Object should include linked_list structure.
+This object should contain sysfs attribute with name “list”.
+On read form attribute “list” it should show content of the objects linked list.
+On write to attribute “list” it should add new string to the objects linked list.
+!! Do not forget properly free all the resources during rmmod.