附件:程序
附件.rar 说明: 目标内核 2.6.33
开发板 :TQ2440
tq移植手册中的 内核是2.6.30.4 ,与2.6.33 不一样,在按照tq 移植手册
中的 led.c 移植时候,总出现 下面的错误- error: 'S3C2410_GPB5_OUTP' undeclared here (not in a function)
所以参考了网上强大 的资源
Linux2.6.33 自己动手写驱动实现了自己 led 功能。
硬件说明:
tq 开发板 led GPB5 6 7 8 是led 控制管脚,当低电平时,led亮。
1. 编写 led 驱动程序- root@yuweixian:/opt/me_linux/linux-2.6.33# cd drivers/ywx-driver/
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root@yuweixian:/opt/me_linux/linux-2.6.33/drivers/ywx-driver# gedit led.c
led.c 文件内容
- #include <linux/miscdevice.h>
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#include <linux/delay.h>
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#include <asm/irq.h>
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#include <mach/regs-gpio.h>
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#include <mach/hardware.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/fs.h>
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#include <linux/types.h>
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#include <linux/delay.h>
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#include <linux/moduleparam.h>
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#include <linux/slab.h>
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#include <linux/errno.h>
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#include <linux/ioctl.h>
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#include <linux/cdev.h>
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#include <linux/string.h>
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#include <linux/list.h>
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#include <linux/pci.h>
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#include <asm/uaccess.h>
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#include <asm/atomic.h>
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#include <asm/unistd.h>
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#include <linux/gpio.h>
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#define DEVICE_NAME "led-control"
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#define S3C2410_GPBCON S3C2410_GPIOREG(0x10)
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#define S3C2410_GPBDAT S3C2410_GPIOREG(0x14)
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#define S3C2410_GPBUP S3C2410_GPIOREG(0x18)
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#define S3C2410_GPB5 S3C2410_GPIONO(S3C2410_GPIO_BANKB, 5)
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#define S3C2410_GPB6 S3C2410_GPIONO(S3C2410_GPIO_BANKB, 6)
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#define S3C2410_GPB7 S3C2410_GPIONO(S3C2410_GPIO_BANKB, 7)
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#define S3C2410_GPB8 S3C2410_GPIONO(S3C2410_GPIO_BANKB, 8)
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#define S3C2410_GPB5_OUTP (0x01 << 10)
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#define S3C2410_GPB6_OUTP (0x01 << 12)
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#define S3C2410_GPB7_OUTP (0x01 << 14)
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#define S3C2410_GPB8_OUTP (0x01 << 16)
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/* 应用程序执行ioctl(fd, cmd, arg)时的第2个参数 */
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#define IOCTL_GPIO_ON 1
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#define IOCTL_GPIO_OFF 0
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/* 用来指定LED所用的GPIO引脚 */
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static unsigned long gpio_table [] =
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{
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S3C2410_GPB(5),
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S3C2410_GPB(6),
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S3C2410_GPB(7),
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S3C2410_GPB(8),
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};
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/* 用来指定GPIO引脚的功能:输出 */
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static unsigned int gpio_cfg_table [] =
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{
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//由于2.6.33内核中没有定义GPIO的动作,所以我在上面自己定义了一下。
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S3C2410_GPB5_OUTP,
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S3C2410_GPB6_OUTP,
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S3C2410_GPB7_OUTP,
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S3C2410_GPB8_OUTP,
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};
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static int te2440_gpio_ioctl(
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struct inode *inode,
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struct file *file,
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unsigned int cmd,
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unsigned long arg)
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{
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if (arg > 4)
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{
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return -EINVAL;
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}
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switch(cmd)
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{
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case IOCTL_GPIO_ON:
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// 设置指定引脚的输出电平为0
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s3c2410_gpio_setpin(gpio_table[arg], 0);
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return 0;
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case IOCTL_GPIO_OFF:
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// 设置指定引脚的输出电平为1
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s3c2410_gpio_setpin(gpio_table[arg], 1);
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return 0;
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default:
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return -EINVAL;
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}
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}
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static struct file_operations dev_fops = {
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.owner = THIS_MODULE,
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.ioctl = te2440_gpio_ioctl,
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};
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static struct miscdevice misc = {
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.minor = MISC_DYNAMIC_MINOR,
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.name = DEVICE_NAME,
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.fops = &dev_fops,
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};
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static int __init dev_init(void)
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{
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int ret;
- int i;
- for (i = 0; i < 4; i++)
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{
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s3c2410_gpio_cfgpin(gpio_table[i], gpio_cfg_table[i]);
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s3c2410_gpio_setpin(gpio_table[i], 0);
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}
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ret = misc_register(&misc);
- printk (DEVICE_NAME" initialized\n");
- return ret;
- }
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static void __exit dev_exit(void)
- {
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misc_deregister(&misc);
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}
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- module_init(dev_init);
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module_exit(dev_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("");
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MODULE_DESCRIPTION("GPIO control for Topelec TE2440DEV_I Board");
2. 修改 Kconfig Makefile
修改 drivers/ywx-driver/Kconfig
- config LED
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tristate "led test "
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help
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this is led test
修改 drivers/ywx-driver/Makefile
- obj-$(CONFIG_HELLO) += hello.o
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obj-$(CONFIG_LED) += led.o
3.编译 make menuconfig,
make zImage
下载到开发板中
4.生成 .ko文件 make SUBDIR=drivers/ywx-driver/ modules
在 dirvers/ywx-driver/ 生成 led.ko 文件,复制到开发板 /lib/mouldes/2.6.33-yuweixian/
5. 编写 应用程序,测试驱动 可用否 应用程序 是 tq 提供的代码 leds.c
arm-linux-gcc -o leds leds.c
cp leds /mnt/hgfs/share-linux/down/leds-application
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <sys/ioctl.h>
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int main(int argc, char **argv)
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{
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int on;
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int led_no;
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int fd;
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if (argc != 3 || sscanf(argv[1], "%d", &led_no) != 1 || sscanf(argv[2],"%d", &on) != 1 ||
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on < 0 || on > 1 || led_no < 1 || led_no > 4) {
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fprintf(stderr, "Usage: leds led_no 0|1\n");
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exit(1);
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}
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fd = open("/dev/led-control", 0);
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if (fd < 0) {
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perror("open device leds");
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exit(1);
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}
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ioctl(fd, on, (led_no-1));
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close(fd);
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return 0;
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}
6.测试 - [root@yuweixian 2.6.33-yuweixian]# ls
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hello.ko led.ko leds-applicaiton modules.dep.bb
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[root@yuweixian 2.6.33-yuweixian]# insmod led.ko
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led-control initialized
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[root@yuweixian 2.6.33-yuweixian]# lsmod
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led 881 0 - Live 0xbf00c000
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[root@yuweixian 2.6.33-yuweixian]# ./leds-applicaiton 2 0
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[root@yuweixian 2.6.33-yuweixian]# ./leds-applicaiton 3 0
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[root@yuweixian 2.6.33-yuweixian]# ./leds-applicaiton 3 1
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[root@yuweixian 2.6.33-yuweixian]# rmmod led
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[root@yuweixian 2.6.33-yuweixian]# lsmod
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[root@yuweixian 2.6.33-yuweixian]#
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