linux 修改代码以支持LED 控制（board-am335xevm）

最新推荐文章于 2025-06-07 14:27:57 发布

原创最新推荐文章于 2025-06-07 14:27:57 发布 · 4k 阅读

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本文介绍了一种在AM335x EVM板上进行LED初始化的具体配置方法，包括定义LED信息、设置平台数据及注册设备等步骤。通过修改fileboard-am335xevm.c文件实现。

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Note:

All the codes are changed at the file board-am335xevm.c

define led informations

static struct gpio_led am335x_evm_gpio_leds[] = {
	{
		.name			= "omap3evm::leda",
		/* normally not visible (board underside) */
		.default_trigger	= "default-on",
		.gpio			= GPIO_TO_PIN(1,23),	/* gets replaced */
		.active_low		= true,
	},
	{
		.name			= "omap3evm::ledb",
		/* normally not visible (board underside) */
		.default_trigger	= "default-on",
		.gpio			=  GPIO_TO_PIN(1,24),	/* gets replaced */
		.active_low		= true,
	},
};

static struct gpio_led_platform_data am335x_evm_gpio_led_info = {
	.leds		= am335x_evm_gpio_leds,
	.num_leds	= ARRAY_SIZE(am335x_evm_gpio_leds),
};

static struct platform_device am335x_evm_leds_gpio = {
    .name    = "leds-gpio",
    .id    = -1,
    .dev    = {
        .platform_data    = &am335x_evm_gpio_led_info,
    },
};

define init function

static void leds_init(int evm_id, int profile)
{
	int err;

	setup_pin_mux(leds_pin_mux);
	err = platform_device_register(&am335x_evm_leds_gpio);
	if (err) {
		pr_err("failed to register matrix keypad (2x3) device\n");
	}
}

add init function

static struct evm_dev_cfg gen_purp_evm_dev_cfg[] = {

...

{leds_init, DEV_ON_BASEBOARD, PROFILE_0},// added by driver monkey

...

 }