网页制作实践 做网站,别样网站建设,两个电脑的wordpress,织梦网站用户名不存在1. 硬件相关的操作
LCD驱动程序的核心就是#xff1a;
分配fb_info设置fb_info注册fb_info硬件相关的设置
硬件相关的设置又可以分为3部分#xff1a;
引脚设置时钟设置LCD控制器设置
2. 在设备树里指定LCD参数 framebuffer-mylcd {compatible 100ask,lcd_drv
分配fb_info设置fb_info注册fb_info硬件相关的设置
硬件相关的设置又可以分为3部分
引脚设置时钟设置LCD控制器设置
2. 在设备树里指定LCD参数 framebuffer-mylcd {compatible 100ask,lcd_drv;pinctrl-names default;pinctrl-0 mylcd_pinctrl;backlight-gpios gpio1 8 GPIO_ACTIVE_HIGH;clocks clks IMX6UL_CLK_LCDIF_PIX,clks IMX6UL_CLK_LCDIF_APB;clock-names pix, axi;display display0;display0: display {bits-per-pixel 24;bus-width 24;display-timings {native-mode timing0;timing0: timing0_1024x768 {clock-frequency 50000000;hactive 1024;vactive 600;hfront-porch 160;hback-porch 140;hsync-len 20;vback-porch 20;vfront-porch 12;vsync-len 3;hsync-active 0;vsync-active 0;de-active 1;pixelclk-active 0;};};}; };3. 编程
3.1 从设备树获得参数
时序参数、引脚极性等信息都被保存在一个display_timing结构体里
参考内核文件
drivers\video\of_display_timing.cdrivers\video\fbdev\mxsfb.c
3.2 使用参数配置LCD控制器
根据芯片手册一个一个设置寄存器
Framebuffer地址设置Framebuffer中数据格式设置LCD时序参数设置LCD引脚极性设置
4.上机实验
1. 要做的事情 去除内核自带的驱动程序 加入我们编写的驱动程序、设备树文件 重新编译内核、设备树 上机测试使用编译出来的内核、设备树启动板子
2. 去除内核自带的驱动程序
修改内核文件drivers/video/fbdev/Makefile把内核自带驱动程序mxsfb.c对应的那行注释掉如下
#obj-$(CONFIG_FB_MXS) mxsfb.o3. 加入新驱动程序、设备树 复制驱动程序 把11_lcd_drv_imx6ull_ok\lcd_drv.c放到内核源码目录drivers/video/fbdev备份内核自带设备树文件arch/arm/boot/dts/100ask_imx6ull-14x14.dts把11_lcd_drv_imx6ull_ok\100ask_imx6ull-14x14.dts放到内核源码目录arch/arm/boot/dts/ 修改内核文件 修改drivers/video/fbdev/Makefile使用我们提供的lcd_drv.c如下
#obj-$(CONFIG_FB_MXS) mxsfb.o
obj-$(CONFIG_FB_MXS) lcd_drv.o4. 重新编译内核、设备树
以下命令在Ubuntu中执行。
设置工具链 export ARCHarmexport CROSS_COMPILEarm-linux-gnueabihf-export PATH$PATH:/home/book/100ask_imx6ull-sdk/ToolChain/gcc-linaro-6.2.1-2016.11-x86_64_arm-linux-gnueabihf/bin配置、编译 book100ask:~/100ask_imx6ull-sdk$ cd Linux-4.9.88book100ask:~/100ask_imx6ull-sdk/Linux-4.9.88$ make 100ask_imx6ull_defconfig book100ask:~/100ask_imx6ull-sdk/Linux-4.9.88$ make zImage book100ask:~/100ask_imx6ull-sdk/Linux-4.9.88$ make dtbs得到 内核arch/arm/boot/zImage设备树文件arch/arm/boot/dts/100ask_imx6ull-14x14.dtb 复制到NFS目录 $ cp arch/arm/boot/zImage ~/nfs_rootfs/$ cp arch/arm/boot/dts/100ask_imx6ull-14x14.dtb ~/nfs_rootfs/5. 上机测试
以下命令在开发板中执行。 挂载NFS vmware使用NAT(假设windowsIP为192.168.1.100) [root100ask:~]# mount -t nfs -o nolock,vers3,port2049,mountport9999
192.168.1.100:/home/book/nfs_rootfs /mntvmware使用桥接或者不使用vmware而是直接使用服务器假设Ubuntu IP为192.168.1.137 [root100ask:~]# mount -t nfs -o nolock,vers3 192.168.1.137:/home/book/nfs_rootfs /mnt更新单板文件 [root100ask:~]# cp /mnt/zImage /boot[root100ask:~]# cp /mnt/100ask_imx6ull-14x14.dtb /boot[root100ask:~]# sync重启开发板观察现象 如果可以看到企鹅LOGO就表示正常如果在终端中可以查看到存在/dev/fb0节点也表示正常 解决BUG 现象LCD上没有企鹅LOGO在终端中执行ls -l /dev/fb0发现没有设备节点 观察内核启动信息看到 [ 0.619880] imx6ul-pinctrl 20e0000.iomuxc: pin MX6UL_PAD_GPIO1_IO08 already requested by 2080000.pwm; cannot claim for 21c8000.framebuffer-mylcd
[ 0.619920] imx6ul-pinctrl 20e0000.iomuxc: pin-31 (21c8000.framebuffer-mylcd) status -22
[ 0.619954] imx6ul-pinctrl 20e0000.iomuxc: could not request pin 31 (MX6UL_PAD_GPIO1_IO08) from group mylcd_pingrp on device 20e0000.iomuxc
[ 0.619985] mylcd 21c8000.framebuffer-mylcd: Error applying setting, reverse things back
[ 0.620070] mylcd: probe of 21c8000.framebuffer-mylcd failed with error -22原因引脚冲突 设备树中pwm节点、framebuffer-mylcd节点都使用到的同一个引脚PAD_GPIO1_IO08 解决方法修改arch/arm/boot/dts/100ask_imx6ull-14x14.dts禁止pwm节点如下
6、代码
#include linux/module.h
#include linux/kernel.h
#include linux/err.h
#include linux/errno.h
#include linux/string.h
#include linux/mm.h
#include linux/slab.h
#include linux/delay.h
#include linux/fb.h
#include linux/init.h
#include linux/dma-mapping.h
#include linux/interrupt.h
#include linux/platform_device.h
#include linux/clk.h
#include linux/cpufreq.h
#include linux/io.h
#include video/display_timing.h
#include video/of_display_timing.h
#include linux/gpio/consumer.h
#include asm/div64.h
#include asm/mach/map.hstruct imx6ull_lcdif {volatile unsigned int CTRL; volatile unsigned int CTRL_SET; volatile unsigned int CTRL_CLR; volatile unsigned int CTRL_TOG; volatile unsigned int CTRL1; volatile unsigned int CTRL1_SET; volatile unsigned int CTRL1_CLR; volatile unsigned int CTRL1_TOG; volatile unsigned int CTRL2; volatile unsigned int CTRL2_SET; volatile unsigned int CTRL2_CLR; volatile unsigned int CTRL2_TOG; volatile unsigned int TRANSFER_COUNT; unsigned char RESERVED_0[12];volatile unsigned int CUR_BUF; unsigned char RESERVED_1[12];volatile unsigned int NEXT_BUF; unsigned char RESERVED_2[12];volatile unsigned int TIMING; unsigned char RESERVED_3[12];volatile unsigned int VDCTRL0; volatile unsigned int VDCTRL0_SET; volatile unsigned int VDCTRL0_CLR; volatile unsigned int VDCTRL0_TOG; volatile unsigned int VDCTRL1; unsigned char RESERVED_4[12];volatile unsigned int VDCTRL2; unsigned char RESERVED_5[12];volatile unsigned int VDCTRL3; unsigned char RESERVED_6[12];volatile unsigned int VDCTRL4; unsigned char RESERVED_7[12];volatile unsigned int DVICTRL0; unsigned char RESERVED_8[12];volatile unsigned int DVICTRL1; unsigned char RESERVED_9[12];volatile unsigned int DVICTRL2; unsigned char RESERVED_10[12];volatile unsigned int DVICTRL3; unsigned char RESERVED_11[12];volatile unsigned int DVICTRL4; unsigned char RESERVED_12[12];volatile unsigned int CSC_COEFF0; unsigned char RESERVED_13[12];volatile unsigned int CSC_COEFF1; unsigned char RESERVED_14[12];volatile unsigned int CSC_COEFF2; unsigned char RESERVED_15[12];volatile unsigned int CSC_COEFF3; unsigned char RESERVED_16[12];volatile unsigned int CSC_COEFF4; unsigned char RESERVED_17[12];volatile unsigned int CSC_OFFSET; unsigned char RESERVED_18[12];volatile unsigned int CSC_LIMIT; unsigned char RESERVED_19[12];volatile unsigned int DATA; unsigned char RESERVED_20[12];volatile unsigned int BM_ERROR_STAT; unsigned char RESERVED_21[12];volatile unsigned int CRC_STAT; unsigned char RESERVED_22[12];volatile unsigned int STAT; unsigned char RESERVED_23[76];volatile unsigned int THRES; unsigned char RESERVED_24[12];volatile unsigned int AS_CTRL; unsigned char RESERVED_25[12];volatile unsigned int AS_BUF; unsigned char RESERVED_26[12];volatile unsigned int AS_NEXT_BUF; unsigned char RESERVED_27[12];volatile unsigned int AS_CLRKEYLOW; unsigned char RESERVED_28[12];volatile unsigned int AS_CLRKEYHIGH; unsigned char RESERVED_29[12];volatile unsigned int SYNC_DELAY;
} ;struct lcd_regs {volatile unsigned int fb_base_phys;volatile unsigned int fb_xres;volatile unsigned int fb_yres;volatile unsigned int fb_bpp;
};static struct lcd_regs *mylcd_regs;
static struct fb_info *myfb_info;
static unsigned int pseudo_palette[16];static struct gpio_desc *bl_gpio;
static struct clk* clk_pix;
static struct clk* clk_axi;static void lcd_controller_enable(struct imx6ull_lcdif *lcdif)
{lcdif-CTRL | (10);
}static int lcd_controller_init(struct imx6ull_lcdif *lcdif, struct display_timing *dt, int lcd_bpp, int fb_bpp, unsigned int fb_phy)
{int lcd_data_bus_width;int fb_width;int vsync_pol 0;int hsync_pol 0;int de_pol 0;int clk_pol 0;if (dt-flags DISPLAY_FLAGS_HSYNC_HIGH)hsync_pol 1;if (dt-flags DISPLAY_FLAGS_VSYNC_HIGH)vsync_pol 1;if (dt-flags DISPLAY_FLAGS_DE_HIGH)de_pol 1;if (dt-flags DISPLAY_FLAGS_PIXDATA_POSEDGE)clk_pol 1;if (lcd_bpp 24)lcd_data_bus_width 0x3;else if (lcd_bpp 18)lcd_data_bus_width 0x2;else if (lcd_bpp 8)lcd_data_bus_width 0x1;else if (lcd_bpp 16)lcd_data_bus_width 0x0;elsereturn -1;if (fb_bpp 24 || fb_bpp 32)fb_width 0x3;else if (fb_bpp 18)fb_width 0x2;else if (fb_bpp 8)fb_width 0x1;else if (fb_bpp 16)fb_width 0x0;elsereturn -1;/* * 初始化LCD控制器的CTRL寄存器* [19] : 1 : DOTCLK和DVI modes需要设置为1 * [17] : 1 : 设置为1工作在DOTCLK模式* [15:14] : 00 : 输入数据不交换小端模式默认就为0不需设置* [13:12] : 00 : CSC数据不交换小端模式默认就为0不需设置* [11:10] : 11 : 数据总线为24bit* [9:8] 根据显示屏资源文件bpp来设置8位0x1 16位0x0 24位0x3* [5] : 1 : 设置elcdif工作在主机模式* [1] : 0 : 24位数据均是有效数据默认就为0不需设置*/ lcdif-CTRL (030) | (029) | (028) | (119) | (117) | (lcd_data_bus_width 10) |\(fb_width 8) | (15);/** 设置ELCDIF的寄存器CTRL1* 根据bpp设置bpp为24或32才设置* [19:16] : 111 :表示ARGB传输格式模式下传输24位无压缩数据A通道不用传输*/ if(fb_bpp 24 || fb_bpp 32){ lcdif-CTRL1 ~(0xf 16); lcdif-CTRL1 | (0x7 16); }elselcdif-CTRL1 | (0xf 16); /** 设置ELCDIF的寄存器TRANSFER_COUNT寄存器* [31:16] : 垂直方向上的像素个数 * [15:0] : 水平方向上的像素个数*/lcdif-TRANSFER_COUNT (dt-vactive.typ 16) | (dt-hactive.typ 0);/** 设置ELCDIF的VDCTRL0寄存器* [29] 0 : VSYNC输出 默认为0无需设置* [28] 1 : 在DOTCLK模式下设置1硬件会产生使能ENABLE输出* [27] 0 : VSYNC低电平有效 ,根据屏幕配置文件将其设置为0* [26] 0 : HSYNC低电平有效 , 根据屏幕配置文件将其设置为0* [25] 1 : DOTCLK下降沿有效 根据屏幕配置文件将其设置为1* [24] 1 : ENABLE信号高电平有效根据屏幕配置文件将其设置为1* [21] 1 : 帧同步周期单位DOTCLK mode设置为1* [20] 1 : 帧同步脉冲宽度单位DOTCLK mode设置为1* [17:0] : vysnc脉冲宽度 */lcdif-VDCTRL0 (1 28)|( vsync_pol 27)\|( hsync_pol 26)\|( clk_pol 25)\|( de_pol 24)\|(1 21)|(1 20)|( dt-vsync_len.typ 0);/** 设置ELCDIF的VDCTRL1寄存器* 设置垂直方向的总周期:上黑框tvb垂直同步脉冲tvp垂直有效高度yres下黑框tvf*/ lcdif-VDCTRL1 dt-vback_porch.typ dt-vsync_len.typ dt-vactive.typ dt-vfront_porch.typ; /** 设置ELCDIF的VDCTRL2寄存器* [18:31] : 水平同步信号脉冲宽度* [17: 0] : 水平方向总周期* 设置水平方向的总周期:左黑框thb水平同步脉冲thp水平有效高度xres右黑框thf*/ lcdif-VDCTRL2 (dt-hsync_len.typ 18) | (dt-hback_porch.typ dt-hsync_len.typ dt-hactive.typ dt-hfront_porch.typ);/** 设置ELCDIF的VDCTRL3寄存器* [27:16] 水平方向上的等待时钟数 thb thp* [15:0] : 垂直方向上的等待时钟数 tvb tvp*/ lcdif-VDCTRL3 ((dt-hback_porch.typ dt-hsync_len.typ) 16) | (dt-vback_porch.typ dt-vsync_len.typ);/** 设置ELCDIF的VDCTRL4寄存器* [18] 使用VSHYNC、HSYNC、DOTCLK模式此为置1* [17:0] : 水平方向的宽度*/ lcdif-VDCTRL4 (118) | (dt-hactive.typ);/** 设置ELCDIF的CUR_BUF和NEXT_BUF寄存器* CUR_BUF : 当前显存地址* NEXT_BUF : 下一帧显存地址* 方便运算都设置为同一个显存地址*/ lcdif-CUR_BUF fb_phy;lcdif-NEXT_BUF fb_phy;return 0;
}/* from pxafb.c */
static inline unsigned int chan_to_field(unsigned int chan,struct fb_bitfield *bf)
{chan 0xffff;chan 16 - bf-length;return chan bf-offset;
}static int mylcd_setcolreg(unsigned regno,unsigned red, unsigned green, unsigned blue,unsigned transp, struct fb_info *info)
{unsigned int val;/* dprintk(setcol: regno%d, rgb%d,%d,%d\n,regno, red, green, blue); */switch (info-fix.visual) {case FB_VISUAL_TRUECOLOR:/* true-colour, use pseudo-palette */if (regno 16) {u32 *pal info-pseudo_palette;val chan_to_field(red, info-var.red);val | chan_to_field(green, info-var.green);val | chan_to_field(blue, info-var.blue);pal[regno] val;}break;default:return 1; /* unknown type */}return 0;
}static struct fb_ops myfb_ops {.owner THIS_MODULE,.fb_setcolreg mylcd_setcolreg,.fb_fillrect cfb_fillrect,.fb_copyarea cfb_copyarea,.fb_imageblit cfb_imageblit,
};static int mylcd_probe(struct platform_device *pdev)
{struct device_node *display_np;dma_addr_t phy_addr;int ret;int width;int bits_per_pixel;struct display_timings *timings NULL;struct display_timing *dt NULL;struct imx6ull_lcdif *lcdif;struct resource *res;display_np of_parse_phandle(pdev-dev.of_node, display, 0);/* get common info */ret of_property_read_u32(display_np, bus-width, width);ret of_property_read_u32(display_np, bits-per-pixel,bits_per_pixel);/* get timming */timings of_get_display_timings(display_np);dt timings-timings[timings-native_mode];/* get gpio from device tree */bl_gpio gpiod_get(pdev-dev, backlight, 0);/* config bl_gpio as output */gpiod_direction_output(bl_gpio, 1);/* set val: gpiod_set_value(bl_gpio, status); *//* get clk from device tree */clk_pix devm_clk_get(pdev-dev, pix);clk_axi devm_clk_get(pdev-dev, axi);/* set clk rate */clk_set_rate(clk_pix, dt-pixelclock.typ);/* enable clk */clk_prepare_enable(clk_pix);clk_prepare_enable(clk_axi);/* 1.1 分配fb_info */myfb_info framebuffer_alloc(0, NULL);/* 1.2 设置fb_info *//* a. var : LCD分辨率、颜色格式 */myfb_info-var.xres_virtual myfb_info-var.xres dt-hactive.typ;myfb_info-var.yres_virtual myfb_info-var.yres dt-vactive.typ;myfb_info-var.bits_per_pixel 16; /* rgb565 */myfb_info-var.red.offset 11;myfb_info-var.red.length 5;myfb_info-var.green.offset 5;myfb_info-var.green.length 6;myfb_info-var.blue.offset 0;myfb_info-var.blue.length 5;/* b. fix */strcpy(myfb_info-fix.id, 100ask_lcd);myfb_info-fix.smem_len myfb_info-var.xres * myfb_info-var.yres * myfb_info-var.bits_per_pixel / 8;if (myfb_info-var.bits_per_pixel 24)myfb_info-fix.smem_len myfb_info-var.xres * myfb_info-var.yres * 4;/* fb的虚拟地址 */myfb_info-screen_base dma_alloc_wc(NULL, myfb_info-fix.smem_len, phy_addr,GFP_KERNEL);myfb_info-fix.smem_start phy_addr; /* fb的物理地址 */myfb_info-fix.type FB_TYPE_PACKED_PIXELS;myfb_info-fix.visual FB_VISUAL_TRUECOLOR;myfb_info-fix.line_length myfb_info-var.xres * myfb_info-var.bits_per_pixel / 8;if (myfb_info-var.bits_per_pixel 24)myfb_info-fix.line_length myfb_info-var.xres * 4;/* c. fbops */myfb_info-fbops myfb_ops;myfb_info-pseudo_palette pseudo_palette;/* 1.3 注册fb_info */register_framebuffer(myfb_info);/* 1.4 硬件操作 *///lcdif ioremap(0x021C8000, sizeof(*lcdif));res platform_get_resource(pdev, IORESOURCE_MEM, 0);lcdif devm_ioremap_resource(pdev-dev, res);lcd_controller_init(lcdif, dt, bits_per_pixel, 16, phy_addr);lcd_controller_enable(lcdif);gpiod_set_value(bl_gpio, 1); return 0;
}static int mylcd_remove(struct platform_device *pdev)
{/* 反过来操作 *//* 2.1 反注册fb_info */unregister_framebuffer(myfb_info);/* 2.2 释放fb_info */framebuffer_release(myfb_info);iounmap(mylcd_regs);return 0;
}static const struct of_device_id mylcd_of_match[] {{ .compatible 100ask,lcd_drv, },{ },
};
MODULE_DEVICE_TABLE(of, simplefb_of_match);static struct platform_driver mylcd_driver {.driver {.name mylcd,.of_match_table mylcd_of_match,},.probe mylcd_probe,.remove mylcd_remove,
};static int __init lcd_drv_init(void)
{int ret;ret platform_driver_register(mylcd_driver);if (ret)return ret;return 0;
}/* 2. 出口 */
static void __exit lcd_drv_exit(void)
{platform_driver_unregister(mylcd_driver);
}module_init(lcd_drv_init);
module_exit(lcd_drv_exit);
MODULE_LICENSE(GPL);
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