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f1c100s adc 或 lradc， 先了解一下。

https://github.com/qq516333132/u-boot/blob/master/board/sunxi/board.c

	int led_r;
	led_r = sunxi_name_to_gpio("PB3");
	if (led_r < 0) {
		printf("Error invalid led_r pin: PB, err %d\n", led_r);
		return led_r;
	}
	ret = gpio_request(led_r, "led_r");
	if (ret) {
		printf("Error requesting soft led_r: PB, err %d\n",ret);
		return ret;
	}

	sunxi_gpio_set_pull(pin, SUNXI_GPIO_PULL_UP); //上拉	
	gpio_direction_output(led_r, 1);

参考1: https://github.com/qq516333132/u-boot/blob/master/arch/arm/include/asm/arch-sunxi/gpio.h
参考2: https://github.com/qq516333132/u-boot/blob/master/arch/arm/mach-sunxi/pinmux.c
参考3: https://www.cnblogs.com/edan/p/9188131.html