mtk查看硬件原理图

https://blog.csdn.net/zhigouliu/article/details/73848682
地址：\192.168.22.243\software_HW_Resource_\项目分类\b939-37\原理图\B939_MB_V5.0_20161125.sch
软件：PADS9.5_3in1中文精简破解版

1.查看tp的reset硬件是哪个GPIO
	1.1 查原理图\\192.168.22.243\software\_HW_Resource_\项目分类\b939-37\原理图\B939_MB_V5.0_20161125.sch
		"14_LCM_CTP"
			选中"RET_CTP"----右键_选择网络----next
			  找到"PCM_SYNC"


	1.2 查表格\\192.168.22.243\software\_HW_Resource_\项目分类\b939-37\B939M10_GPIO配置表.xls
		PCM_SYNC----TP复位脚----GPIO62

2.查看串口点:
	2.1 查原理图\\192.168.22.243\software\_HW_Resource_\项目分类\b939-37\原理图\B939_MB_V5.0_20161125.sch
		"07_BB_2"
			"UART"
				"UTXD0" - 点击选中
					打开\\192.168.22.243\software\_HW_Resource_\项目分类\b939-37\原理图\B939_MB_V5.0_20161125.pcb
						点击“标准工具栏”中的“PADS Layout”，与B939_MB_V5.0_20161125.pcb链接
							在layout中可以看到有网络高亮。即所要找的串口测试点
							
		注：在查看layout图中，由于太多层叠，可以在菜单栏的“设置”中修改“显示颜色设置”
			关闭一些，只保留"Top"和"Bottom" 即可
		
3.喇叭没有声音----硬件测喇叭是好的
	3.1 硬件原理图查看喇叭gpio口
		\\192.168.22.243\software\_HW_Resource_\项目分类\b939-37\原理图\B939_MB_V5.0_20161125.sch
		查看得知为GPIO59
	
	3.2 修改驱动 - 如果是写死在驱动中
		kernel-3.18\sound\soc\mediatek\mt_soc_audio_v3\mt_soc_codec_63xx.c
		1867  #define GPIO_SPEAKER_EN_PIN	59		//改为2

	3.3 修改dts - 如果是写在dts中
		/* AUdio_extal_AMP_GPIO  Kernel Standardization start */
		&pio {
			audioss_default: audioss_default {
			};

			pinctrl_audioss0: pinctrl_audioss0@gpio59 {
				pins_cmd_dat {
					pins = <PINMUX_GPIO59__FUNC_GPIO59>;
					slew-rate = <1>;
					bias-pull-up = <00>;
				};
			};

			pinctrl_audioss0_low: pinctrl_audioss0_low@gpio59 {
				pins_cmd_dat {
					pins = <PINMUX_GPIO59__FUNC_GPIO59>;
					slew-rate = <1>;
					output-low;
					bias-pull-up = <00>;
				};
			};

			pinctrl_audioss0_high: pinctrl_audioss0_high@gpio59 {
				pins_cmd_dat {
					pins = <PINMUX_GPIO59__FUNC_GPIO59>;
					slew-rate = <1>;
					output-high;
					bias-pull-up = <00>;
				};
			};

		   };
		&audioss {
			pinctrl-names = "audioss_default", "pinctrl_audioss0", "pinctrl_audioss0_low", "pinctrl_audioss0_high";
			pinctrl-0 = <&audioss_default>;
			pinctrl-1 = <&pinctrl_audioss0>;
			pinctrl-2 = <&pinctrl_audioss0_low>;
			pinctrl-3 = <&pinctrl_audioss0_high>;

			status = "okay";
		};
		/* AUdio_extal_AMP_GPIO Kernel Standardization end */