本文基于chipsee平台的扩展板为Beaglebone平台添加GUI支持。
5) 拷贝/opt/qt 到开发板上的相同目录中，有些东西是不必要的，例如bin/ 等等。
6) 设置QT编译环境，使用如下脚本，soucre 一下就好
首先是开发环境的选择，这里我们使用TI SDK(ti-sdk-am335x-evm-05.06.00.00-Linux-x86)中提供的Linux内核与最精简根文件系统(arago-base-tisdk-image-am335x-evm.tar.gz)。
修改Linux内核支持Chipsee扩展板LCD与电容屏
这个可以对照chipsee提供的修改过的内核来做，无非就是添加两个驱动支持(具体设备名称参见chipsee提供的资料)。
1) 添加LCD相关支持
(1) LCD背光支持，不用手动添加，原始代码中已有，这里列出相关代码。
arch/arm/mach-omap2/board-am335xevm.c:
static struct platform_pwm_backlight_data am335x_backlight_data0 = {
.pwm_id = "ecap.0",
.ch = -1,
.lth_brightness = 21,
.max_brightness = AM335X_BACKLIGHT_MAX_BRIGHTNESS,
.dft_brightness = AM335X_BACKLIGHT_DEFAULT_BRIGHTNESS,
.pwm_period_ns = AM335X_PWM_PERIOD_NANO_SECONDS,
};
static struct platform_pwm_backlight_data am335x_backlight_data2 = {
.pwm_id = "ecap.2",
.ch = -1,
.lth_brightness = 21,
.max_brightness = AM335X_BACKLIGHT_MAX_BRIGHTNESS,
.dft_brightness = AM335X_BACKLIGHT_DEFAULT_BRIGHTNESS,
.pwm_period_ns = AM335X_PWM_PERIOD_NANO_SECONDS,
};
... ...
/* Setup pwm-backlight */
static struct platform_device am335x_backlight = {
.name = "pwm-backlight",
.id = -1,
.dev = {
.platform_data = &am335x_backlight_data0, // 我也不知道为什么要先设成data0再修改成data2，可能有些其他evm板使用的是ecap.0吧
},
};
... ...
static int __init backlight_init(void)
{
int status = 0;
if (backlight_enable) {
int ecap_index = 0; // 默认使用ecap.0
switch (am335x_evm_get_id()) {
case GEN_PURP_EVM:
case GEN_PURP_DDR3_EVM:
ecap_index = 0;
break;
case EVM_SK:
/*
* Invert polarity of PWM wave from ECAP to handle
* backlight intensity to pwm brightness
*/
ecap_index = 2;
pwm_pdata[ecap_index].chan_attrib[0].inverse_pol = true;
am335x_backlight.dev.platform_data =
&am335x_backlight_data2; // Beaglebone使用ecap.2
break;
default:
pr_err("%s: Error on attempting to enable backlight,"
" not supported\n", __func__);
return -EINVAL;
}
am33xx_register_ecap(ecap_index, &pwm_pdata[ecap_index]); // 注册设备
platform_device_register(&am335x_backlight); // sys文件系统
}
return status;
}
late_initcall(backlight_init); // board初始化后调用(2) LCD控制器初始化，一个是TFP410（TI芯片，位于扩展板），另一个为INNOLUX_TN92（位于LCD屏幕上，使用TFP410进行控制）。
arch/arm/mach-omap2/board-am335xevm.c:
static const struct display_panel disp_panel = {
WVGA,
16,
16,
COLOR_ACTIVE,
};
... ...
static struct lcd_ctrl_config lcd_cfg = {
&disp_panel,
.ac_bias = 255,
.ac_bias_intrpt = 0,
.dma_burst_sz = 16,
.bpp = 16,
.fdd = 0x80,
.tft_alt_mode = 0,
.stn_565_mode = 0,
.mono_8bit_mode = 0,
.invert_line_clock = 0,
.invert_frm_clock = 1,
.sync_edge = 0,
.sync_ctrl = 1,
.raster_order = 0,
};
struct da8xx_lcdc_platform_data TFC_S9700RTWV35TR_01B_pdata = {
.manu_name = "ThreeFive",
.controller_data = &lcd_cfg,
.type = "INNOLUX_TN92",
};
static void csun_lcdc_init(int evm_id, int profile) {
setup_pin_mux(lcdc_pin_mux); // lcdc_pin_mux 此结构太长且不许要修改在这就不列出了
if (conf_disp_pll(300000000)) {
pr_info("Failed configure display PLL, not attempting to"
"register LCDC\n");
return;
}
if (am33xx_register_lcdc(&TFC_S9700RTWV35TR_01B_pdata))
pr_info("Failed to register LCDC device\n");
}
... ...static struct da8xx_panel known_lcd_panels[] = {
/* Sharp LCD035Q3DG01 */
[0] = {
.name = "Sharp_LCD035Q3DG01",
.width = 320,
.height = 240,
.hfp = 8,
.hbp = 6,
.hsw = 0,
.vfp = 2,
.vbp = 2,
.vsw = 0,
.pxl_clk = 4608000,
.invert_pxl_clk = 1,
},
... ...
/* INNOLUX AT070TN92 */ // 添加 "INNOLUX AT070TN92" panel
[4] = {
.name = "INNOLUX_TN92",
.width = 800,
.height = 480,
.hfp = 1,
.hbp = 45,
.hsw = 48,
.vfp = 12,
.vbp = 20,
.vsw = 2,
.pxl_clk = 25000000,
.invert_pxl_clk = 0,
},
}; 2) 添加触摸屏支持
(1) 触摸屏初始化，其实就是初始化管脚配置，具体工作留给相应驱动程序完成。
arch/arm/mach-omap2/board-am335xevm.c:
/* Pin mux for captive touch screen */
static struct pinmux_config cap_tsc_pin_mux[] = {
{"gpmc_wait0.gpio0_30", OMAP_MUX_MODE7 | AM33XX_PIN_INPUT},
{"NULL",0},
};
#define CAP_TSC_INT GPIO_TO_PIN(0,30)
static void cap_tsc_init(int evm_id,int profile)
{
setup_pin_mux(cap_tsc_pin_mux);
return;
}... ...
config TOUCHSCREEN_FT5X0X
tristate "FocalTech ft5x0x touchscreen"
depends on I2C
default n
... ...wm97xx-ts-y := wm97xx-core.o
obj-$(CONFIG_TOUCHSCREEN_FT5X0X) += ft5x0x_ts.o
obj-$(CONFIG_TOUCHSCREEN_88PM860X) += 88pm860x-ts.o
... ...3) 向beaglebone 初始化结构中添加相应函数
arch/arm/mach-omap2/board-am335xevm.c:
... ...
/* Beaglebone Rev A3 and after */
static struct evm_dev_cfg beaglebone_dev_cfg[] = {
{am335x_rtc_init, DEV_ON_BASEBOARD, PROFILE_NONE},
{clkout2_enable, DEV_ON_BASEBOARD, PROFILE_NONE},
{tps65217_init, DEV_ON_BASEBOARD, PROFILE_NONE},
{csun_lcdc_init, DEV_ON_BASEBOARD, PROFILE_NONE}, // ADD BY Cedric Sun, lcd controller
{cap_tsc_init, DEV_ON_BASEBOARD, PROFILE_NONE}, // ADD BY Cedric Sun, capacitive touch screen pin mux
{mii1_init, DEV_ON_BASEBOARD, PROFILE_NONE},
{usb0_init, DEV_ON_BASEBOARD, PROFILE_NONE},
{usb1_init, DEV_ON_BASEBOARD, PROFILE_NONE},
{mmc0_init, DEV_ON_BASEBOARD, PROFILE_NONE},
{i2c1_init, DEV_ON_BASEBOARD, PROFILE_NONE}, // ADD BY Cedric Sun, used by capacitive touch screen
{i2c2_init, DEV_ON_BASEBOARD, PROFILE_NONE},
{NULL, 0, 0},
};
... ...
5) 使用tslib 来进行测试，具体tslib 的编译安装这里不表。
添加QT4.8.4支持
1) 从 http://download.qt-project.org/official_releases/qt/4.8/4.8.4/qt-everywhere-opensource-src-4.8.4.tar.gz 下载源码。2) 添加mkspecs 文件，在qt-src/mkspecs/qws 目录下添加linux-arago-g++ 文件夹，在其下创建两个文件"qmake.conf", "qplatformdefs.h"。
qmake.conf:
#
# qmake configuration for building with arm-linux-g++
#
QMAKE_CFLAGS_RELEASE = -march=armv7-a -mtune=cortex-a8 -mfpu=neon -mfloat-abi=softfp
QMAKE_INCDIR = /home/cedric/Projects/beaglebone/tools/tslib/install/include
QMAKE_LIBDIR = /home/cedric/Projects/beaglebone/tools/tslib/install/lib
include(../../common/linux.conf)
include(../../common/gcc-base-unix.conf)
include(../../common/g++-unix.conf)
include(../../common/qws.conf)
# modifications to g++.conf
QMAKE_CC = arm-arago-linux-gnueabi-gcc
QMAKE_CXX = arm-arago-linux-gnueabi-g++
QMAKE_LINK = arm-arago-linux-gnueabi-g++
QMAKE_LINK_SHLIB = arm-arago-linux-gnueabi-g++
# modifications to linux.conf
QMAKE_AR = arm-arago-linux-gnueabi-ar cqs
QMAKE_OBJCOPY = arm-arago-linux-gnueabi-objcopy
QMAKE_STRIP = arm-arago-linux-gnueabi-strip
load(qt_config)qplatformdefs.h:
#include "../../linux-g++/qplatformdefs.h"./configure -opensource -confirm-license -no-pch -platform linux-g++-64 -xplatform qws/linux-arago-g++ -embedded armv7 -prefix /opt/qt -qt-gfx-linuxfb -qt-gfx-vnc -no-largefile -exceptions -no-accessibility -no-qt3support -no-sse2 -qt-zlib -no-gif -no-libtiff -qt-libpng -no-libmng -qt-libjpeg -openssl -no-nis -no-cups -qt-kbd-linuxinput -nomake demos -nomake examples -qt-mouse-linuxinput -qt-mouse-tslib5) 拷贝/opt/qt 到开发板上的相同目录中，有些东西是不必要的，例如bin/ 等等。
6) 设置QT编译环境，使用如下脚本，soucre 一下就好
export OE_QMAKE_CC=arm-arago-linux-gnueabi-gcc
export OE_QMAKE_CXX=arm-arago-linux-gnueabi-g++
export OE_QMAKE_LINK=arm-arago-linux-gnueabi-g++
export OE_QMAKE_LINK_SHLIB=arm-arago-linux-gnueabi-g++
export OE_QMAKE_AR=arm-arago-linux-gnueabi-ar
export OE_QMAKE_OBJCOPY=arm-arago-linux-gnueabi-objcopy
export OE_QMAKE_STRIP=arm-arago-linux-gnueabi-strip
export OE_QMAKE_CFLAGS="-march=armv7-a -mtune=cortex-a8 -mfpu=neon -mfloat-abi=softfp"
export PATH=$PATH:"/usr/local/ti-sdk-am335x-evm/linux-devkit/bin"#!/bin/sh
# QWS
export QWS_MOUSE_PROTO=Tslib:/dev/input/event0
export POINTERCAL_FILE=$TSLIB_ROOT/etc/pointercal
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/opt/qt/lib
# tslib
export TSLIB_ROOT=/opt/tslib
export TSLIB_TSDEVICE=/dev/input/event0
export TSLIB_CONFFILE=$TSLIB_ROOT/etc/ts.conf
export TSLIB_PLUGINDIR=$TSLIB_ROOT/lib/ts
export TSLIB_CALIBFILE=$TSLIB_ROOT/etc/pointercal
export TSLIB_FBDEVICE=/dev/fb0
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$TSLIB_ROOT/lib来源：oschina
链接：https://my.oschina.net/u/614480/blog/126158