TX2440A LED driver

       Compile the Linux system that supports NAND FLASH driver and yaffs2 file system according to the transplantation document, then burn the kernel image into FLASH, and then burn the root_2.6.31.bin image on the CD into FLASH. In this way, the most basic environment for testing the driver is established on the target board. At the same time, the compiled source code becomes the kernel tree environment for compiling the driver on the host machine.

       When compiling the driver, you can use: make -C /.../.../linux-2.6.31/ SUBDIRS=$PWD modules

                                           Note: Makefile is required; /.../.../linux-2.6.31/ is the kernel tree directory

                                           If you want to compile the LED driver of TX2440A, that is, the TX2440_led.c source file in the CD, there is a sentence in the Makefile file:

                                           obj-m := TX2440_led.o.

       When compiling the LED driver, you should also note that you need to modify the arch/arm/plat-s3c2440/common-smdk.c source file in the source code. In arch/arm/plat-s3c24xx/common-smdk.c, set GPF0-GPF3 as outputs, all outputting low levels. Just modify the smdk_machine_init function

void __init smdk_machine_init(void)

{

    /* Configure the LEDs (even if we have no LED support)*/

    s3c2410_gpio_cfgpin(S3C2410_GPF(0), S3C2410_GPIO_OUTPUT);

    s3c2410_gpio_cfgpin(S3C2410_GPF(1), S3C2410_GPIO_OUTPUT);

    s3c2410_gpio_cfgpin(S3C2410_GPF(2), S3C2410_GPIO_OUTPUT);

    s3c2410_gpio_cfgpin(S3C2410_GPF(3), S3C2410_GPIO_OUTPUT);

    s3c2410_gpio_cfgpin(S3C2410_GPF(4), S3C2410_GPIO_OUTPUT);

    s3c2410_gpio_cfgpin(S3C2410_GPF(5), S3C2410_GPIO_OUTPUT);

    s3c2410_gpio_cfgpin(S3C2410_GPF(6), S3C2410_GPIO_OUTPUT);

    s3c2410_gpio_cfgpin(S3C2410_GPF(7), S3C2410_GPIO_OUTPUT);

    s3c2410_gpio_setpin(S3C2410_GPF(0), 0);

    s3c2410_gpio_setpin(S3C2410_GPF(1), 0);

    s3c2410_gpio_setpin(S3C2410_GPF(2), 0);

    s3c2410_gpio_setpin(S3C2410_GPF(3), 0);

    s3c2410_gpio_setpin(S3C2410_GPF(4), 1);

    s3c2410_gpio_setpin(S3C2410_GPF(5), 1);

    s3c2410_gpio_setpin(S3C2410_GPF(6), 1);

    s3c2410_gpio_setpin(S3C2410_GPF(7), 1);

    if (machine_is_smdk2443())

        smdk_nand_info.twrph0 = 50;

    s3c_device_nand.dev.platform_data = &smdk_nand_info;

    platform_add_devices(smdk_devs, ARRAY_SIZE(smdk_devs));

    s3c_pm_init();

}

The code is generated by codehl software and then copied by opening it in Word.

 From this, you can also think that you can also add the code added in the smdk_machine_init function in the driver, and the effect is the same.