feat(blinky): 添加电池模块支持

- 在CMakeLists.txt中添加battery_module.c源文件
- 在设备树中添加电压分压器配置和ADC通道设置
- 添加传感器和ADC相关的Kconfig配置
- 实现电池模块功能，包括电压采样、电源管理事件处理
- 支持电池电压定期采样和日志输出

boards/atguigu/mini_keyboard/mini_keyboard.dts

@@ -1,6 +1,7 @@
 /dts-v1/;
 #include <nordic/nrf52840_qiaa.dtsi>
 #include "mini_keyboard-pinctrl.dtsi"
+#include <zephyr/dt-bindings/adc/adc.h>
 
 / {
 	model = "Mini keyboard";
@@ -22,6 +23,15 @@
             gpios = <&gpio1 2 GPIO_ACTIVE_LOW>;
         };
     };
+
+	vbatt: vbatt {
+		compatible = "voltage-divider";
+		io-channels = <&adc 7>;
+		output-ohms = <100000>;
+		full-ohms = <200000>;
+		power-gpios = <&gpio0 9 GPIO_ACTIVE_HIGH>;
+		power-on-sample-delay-us = <200>;
+	};
 };
 
 &flash0 {
@@ -52,6 +62,26 @@
 	};
 };
 
+&uicr {
+	nfct-pins-as-gpios;
+};
+
+&adc {
+	status = "okay";
+	#address-cells = <1>;
+	#size-cells = <0>;
+
+	channel@7 {
+		reg = <7>;
+		zephyr,gain = "ADC_GAIN_1_4";
+		zephyr,reference = "ADC_REF_INTERNAL";
+		zephyr,acquisition-time = <ADC_ACQ_TIME(ADC_ACQ_TIME_MICROSECONDS, 40)>;
+		zephyr,input-positive = <NRF_SAADC_AIN7>;
+		zephyr,resolution = <14>;
+		zephyr,oversampling = <4>;
+	};
+};
+
 &gpio0 {
 	status = "okay";
 };