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全志D1s开发板实战:GT1151触摸屏驱动移植避坑指南(附源码下载)

全志D1s平台GT1151触摸屏驱动深度适配与实战避坑指南

最近在基于全志D1s开发一个嵌入式显示项目时,遇到了GT1151触摸屏的驱动适配问题。这个看似简单的任务,在实际操作中却踩了不少坑,特别是RISC-V架构下的头文件兼容性、设备树配置细节以及固件配置的获取方式。经过几天的调试和验证,终于让触摸屏稳定工作了。今天就把整个过程中的关键步骤、遇到的问题以及解决方案整理出来,希望能帮到正在或将要进行类似开发的同行。

全志D1s作为一款基于RISC-V架构的处理器,在嵌入式显示领域有着不错的性价比。但正因为其RISC-V架构,一些在ARM平台上看似平常的驱动移植工作,在这里可能会遇到意想不到的挑战。GT1151作为汇顶科技的主流触摸芯片,虽然官方提供了通用驱动,但要让它完美运行在D1s平台上,还需要一些针对性的调整。

1. 开发环境准备与源码获取

开始之前,确保你的开发环境已经搭建完毕。对于全志D1s,通常使用Tina Linux SDK作为开发基础。我使用的是Tina Linux 5.4版本,内核版本为Linux 5.4.61。

1.1 获取GT1151官方驱动源码

汇顶科技在GitHub上维护了一个通用的触摸驱动仓库,这是我们的起点:

git clone https://github.com/goodix/gt1x_driver_generic.git

这个仓库包含了GT1x系列触摸芯片的通用驱动代码,支持GT1151、GT911、GT9271等多个型号。下载后,我们需要将其整合到Tina SDK的内核驱动目录中。

1.2 驱动目录结构规划

在Tina SDK中,触摸屏驱动通常放在drivers/input/touchscreen/目录下。我建议创建一个专门的目录来管理GT1151驱动:

# 在Tina SDK根目录下执行 mkdir -p kernel/linux-5.4/drivers/input/touchscreen/gt1x_new cp -r gt1x_driver_generic/* kernel/linux-5.4/drivers/input/touchscreen/gt1x_new/

这样做的目的是保持驱动代码的独立性,便于后续维护和更新。驱动目录的基本结构如下:

gt1x_new/ ├── Kconfig ├── Makefile ├── gt1x.c ├── gt1x_generic.c ├── gt1x_generic.h ├── gt1x_gesture.c ├── gt1x_tools.c └── include/ └── gt1x_generic.h

注意:不同版本的Tina SDK可能内核版本不同,请根据实际情况调整路径。我遇到过一些开发者直接将驱动放在drivers/input/touchscreen/根目录下,这样虽然简单,但不利于多款触摸芯片的并行管理。

2. 设备树配置详解

设备树配置是触摸驱动适配中最关键的一环,配置不当会导致驱动无法正常识别硬件或无法正确初始化。

2.1 引脚复用配置

首先需要确认硬件连接。通过查看原理图,我使用的GT1151连接到了D1s的I2C2接口,对应的引脚为PD20(SCL)和PD21(SDA)。中断引脚为PD12,复位引脚为PD13。

在全志平台的设备树中,I2C接口通常被称为"twi"。我们需要在设备树中正确配置这些引脚的复用功能:

// 文件:board.dts 或对应的设备树文件 &pio { twi2_pins_a: twi2@0 { pins = "PD20", "PD21"; function = "twi2"; drive-strength = <10>; bias-disable; }; twi2_pins_b: twi2@1 { pins = "PD20", "PD21"; function = "gpio_in"; bias-disable; }; gt1151_int_pin: gt1151_int_pin { pins = "PD12"; function = "gpio_in"; bias-pull-up; }; gt1151_rst_pin: gt1151_rst_pin { pins = "PD13"; function = "gpio_out"; bias-disable; }; };

这里有几个关键点需要注意:

  1. drive-strength:驱动强度设置,对于I2C总线,通常设置为10mA即可。如果线路较长或有干扰,可以适当增大。
  2. bias-pull-up:中断引脚通常需要上拉,确保空闲时为高电平。
  3. function:引脚功能选择,twi2表示I2C功能,gpio_ingpio_out分别表示GPIO输入和输出。

2.2 I2C设备节点配置

接下来在I2C2总线节点下添加GT1151设备节点:

&twi2 { clock-frequency = <400000>; pinctrl-names = "default", "sleep"; pinctrl-0 = <&twi2_pins_a>; pinctrl-1 = <&twi2_pins_b>; status = "okay"; gt1151_ts@14 { compatible = "goodix,gt1151"; reg = <0x14>; interrupt-parent = <&pio>; interrupts = <PD 12 IRQ_TYPE_EDGE_FALLING>; /* 电源管理相关,如果使用外部LDO供电需要配置 */ // vdd-supply = <&reg_dcdc1>; // vcc-i2c-supply = <&reg_aldo1>; /* GPIO配置 */ reset-gpios = <&pio PD 13 GPIO_ACTIVE_LOW>; irq-gpios = <&pio PD 12 GPIO_ACTIVE_HIGH>; /* 触摸屏参数 */ touchscreen-size-x = <800>; touchscreen-size-y = <480>; touchscreen-inverted-x; // touchscreen-inverted-y; // touchscreen-swapped-x-y; /* 固件配置数据 - 需要从触摸屏厂商获取 */ goodix,default-config = [ 46 D0 02 00 05 05 3D 14 08 80 0A 05 01 E1 01 0A 00 00 00 00 00 00 00 18 1A 1E 14 8C 2E 0E 33 35 0C 08 00 00 00 9A 03 11 00 00 00 00 00 03 64 32 00 00 00 1E 5A 94 C5 02 00 00 00 04 B0 23 00 9B 2D 00 7C 3A 00 63 4B 00 50 60 00 50 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 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