前往小程序，Get更优阅读体验！
立即前往
文档建议反馈控制台
首页
学习
活动
专区
工具
TVP
最新优惠活动
文章/答案/技术大牛
发布
首页
学习
活动
专区
工具
TVP最新优惠活动
返回腾讯云官网
社区首页 >专栏 >44.Linux君正X1000-添加st7789v显示

44.Linux君正X1000-添加st7789v显示

作者头像
诺谦
发布于 2018-08-31 17:38:53
1.5K0
发布于 2018-08-31 17:38:53
举报
文章被收录于专栏：Linux驱动Linux驱动

由于板子LCD旧屏是ili9335型号的,旧屏有时候会断货,如果断货则使用一个st7789v型号的LCD

它们两个屏的区别在于初始化屏的参数不同,引脚都一样,也就是说需要使板子同时支持ili9335型号和st7789v型号

思路:

  • 1.uboot在显示LOG(初始化屏参数)之前,通过命令来读LCD型号,来检测LCD型号,然后来修改初始化屏的参数.
  • 2.如果屏是新屏,则设置bootargs,向内核传递参数lcd_type=new
  • 3.当kernel收到参数lcd_type=new时,则在初始化LCD之前,修改屏的参数.

改uboot

首先来看单板配置信息,根据配置找到哪个文件是初始化LCD屏的

根据make ap60pro_uImage_sfc_nand命令,找ap60pro_uImage_sfc_nand单板信息

代码语言：javascript
复制
vi   ./u-boot/boards.cfg　　　　

找到:

代码语言：javascript
复制
# Target      ARCH   CPU   Board name  Vendor     SoC    Options
##############################################################
ap60pro_uImage_sfc_nand      mips        xburst      ap60pro       ingenic    x1000   ap60pro:SPL_SFC_NAND,LIBSLEEP,GET_BT_MAC

从上面看到board name为ap60pro,所以最终通过下面几个来初始化: 

代码语言：javascript
复制
./arch/mips/cpu/xburst\x1000\start.S    //启动代码
./include/configs/ap60pro.h             //各种define配置
./board/ingenic/ap60pro                 //单板配置源文件

查看ap60pro.h,查看LCD相关的define配置

查找CONFIG_ILI9335_240X320,找到在./board/ingenic/ap60pro/Makefile里调用:

代码语言：javascript
复制
COBJS-$(CONFIG_ILI9335_240X320) += lcd-ili9335_240x320.o　　　　//保存LCD初始化参数的信息

查找CONFIG_ILI9335_240X320,找到在./drivers/video/Makefile里调用:

代码语言：javascript
复制
COBJS-$(CONFIG_JZ_LCD_V13) +=  jz_lcd/jz_lcd_v13.o    　　　　//根据lcd-ili9335_240*320.c来初始化LCD

修改lcd-ili9335_240x320.c

添加st7789v初始化的数组表(在代码中以New_ili9335_data_table数组表示):

代码语言：javascript
复制
struct smart_lcd_data_table ili9335_data_table[] = {    //旧屏的初始化参数表
{SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0xec},
    {SMART_CONFIG_DATA,0x1e},
    {SMART_CONFIG_DATA,0x8f},
    
    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x01},
    {SMART_CONFIG_DATA,0x01},
    {SMART_CONFIG_DATA,0x00},

    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x02},
    {SMART_CONFIG_DATA,0x02},
    {SMART_CONFIG_DATA,0x00},

    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x03},
    {SMART_CONFIG_DATA,0x10},
    {SMART_CONFIG_DATA,0x30},

    {SMART_CONFIG_UDELAY,10000},
    
    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x08},
    {SMART_CONFIG_DATA,0x02},
    {SMART_CONFIG_DATA,0x02},
    
    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x09},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0x00},

    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x0a},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0x08}, //enable te
    
    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x0d},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0x00},
    
    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x0f},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0x00},
    
    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x60},
    {SMART_CONFIG_DATA,0x27},
    {SMART_CONFIG_DATA,0x00},
    
    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x61},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0x00},

    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x6a},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0x00},
    
    {SMART_CONFIG_UDELAY,10000},
    
    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x10},
    {SMART_CONFIG_DATA,0x16},
    {SMART_CONFIG_DATA,0x90},
    
    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x11},
    {SMART_CONFIG_DATA,0x02},
    {SMART_CONFIG_DATA,0x27},
    
    {SMART_CONFIG_UDELAY,10000},
    
    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x12},
        {SMART_CONFIG_DATA,0x00},
        {SMART_CONFIG_DATA,0x0d},
    
    {SMART_CONFIG_UDELAY,10000},

    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x21},
    {SMART_CONFIG_DATA,0x16},
    {SMART_CONFIG_DATA,0x00},
    
    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x29},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0x18},

    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x2b},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0x0a},
    
    {SMART_CONFIG_UDELAY,10000},
    
    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x20},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0x00},
    
    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x21},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0x00},
    //============Gamma============
    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x30},
    {SMART_CONFIG_DATA,0x04},
    {SMART_CONFIG_DATA,0x03},
    
    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x31},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0x07},
    
    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x32},
    {SMART_CONFIG_DATA,0x04},
    {SMART_CONFIG_DATA,0x04},
    
    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x35},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0x02},
    
    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x36},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0x0f},
    
    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x37},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0x03},
    
    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x38},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0x00},
    
    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x39},
    {SMART_CONFIG_DATA,0x03},
    {SMART_CONFIG_DATA,0x02},
    
    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x3c},
    {SMART_CONFIG_DATA,0x02},
    {SMART_CONFIG_DATA,0x00},
    
    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x3d},
    {SMART_CONFIG_DATA,0x0f},
    {SMART_CONFIG_DATA,0x00},
      //=============================
    // set RAM address
  {SMART_CONFIG_CMD,0x00},
   {SMART_CONFIG_CMD,0x50},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0x00},

    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x51},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0xef},

    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x52},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0x00},
    
    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x53},
    {SMART_CONFIG_DATA,0x01},
    {SMART_CONFIG_DATA,0x3f},
    
    {SMART_CONFIG_UDELAY,10000},
    
    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x80},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0x00},
    
    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x81},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0x00},

    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x82},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0x00},

    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x83},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0x00},

    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x84},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0x00},

    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x85},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0x00},

    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x90},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0x10},

    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x91},
    {SMART_CONFIG_DATA,0x06},
    {SMART_CONFIG_DATA,0x00},

    //display on
    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x07},
    {SMART_CONFIG_DATA,0x01},
    {SMART_CONFIG_DATA,0x33},
    
    {SMART_CONFIG_CMD,0x00},
    {SMART_CONFIG_CMD,0x22},
    
};


unsigned long truly_cmd_buf[]= {
    0x22002200,
};
struct jzfb_config_info jzfb1_init_data = {
    .num_modes = 1,
    .modes = &jzfb1_videomode,
    .lcd_type = LCD_TYPE_SLCD,
    .bpp    = 24,                            //R8G8B8
    .pinmd  = 0,

    .smart_config.rsply_cmd_high       = 0,
    .smart_config.csply_active_high    = 0,
    /* write graphic ram command, in word, for example 8-bit bus, write_gram_cmd=C3C2C1C0. */
    .smart_config.newcfg_fmt_conv =  0,
    .smart_config.clkply_active_rising = 1,
    .smart_config.data_times = 2,
    .smart_config.write_gram_cmd = truly_cmd_buf,
    .smart_config.length_cmd = ARRAY_SIZE(truly_cmd_buf),
    .smart_config.bus_width = 8,                                    //总线8位的
    .smart_config.length_data_table =  ARRAY_SIZE(ili9335_data_table),
    .smart_config.data_table = ili9335_data_table,
    .dither_enable = 1,
};

//新屏的初始化参数表
static struct smart_lcd_data_table New_ili9335_data_table[] = {
   {SMART_CONFIG_CMD,0x11},
       {SMART_CONFIG_UDELAY,120000},    //Sleep out
      {SMART_CONFIG_CMD,0x36},                //控制
    {SMART_CONFIG_DATA,0x00},
        
         {SMART_CONFIG_CMD,0x21},    //0x13显示不反转 ,21h 反显
         
         
    {SMART_CONFIG_CMD,0x3A},
    {SMART_CONFIG_DATA,0x05},

    {SMART_CONFIG_CMD,0x2A},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0xEF},

    {SMART_CONFIG_CMD,0x2B},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0x01},
    {SMART_CONFIG_DATA,0x3F},

    {SMART_CONFIG_CMD,0xB2},        //前后肩
    {SMART_CONFIG_DATA,0x0C},
    {SMART_CONFIG_DATA,0x0C},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0x33},
    {SMART_CONFIG_DATA,0x33},

    {SMART_CONFIG_CMD,0xB7},     //VGH VGL
    {SMART_CONFIG_DATA,0x35},

    {SMART_CONFIG_CMD,0xBB},     //VCOM 
    {SMART_CONFIG_DATA,0x1E},

    {SMART_CONFIG_CMD,0xC0},      //LCM
    {SMART_CONFIG_DATA,0x2C},

    {SMART_CONFIG_CMD,0xC2},
    {SMART_CONFIG_DATA,0x01},

    {SMART_CONFIG_CMD,0xC3},     //VRH( vcom+vcom offset+vdv) 
    {SMART_CONFIG_DATA,0x27},

    {SMART_CONFIG_CMD,0xC4},     //vdv
    {SMART_CONFIG_DATA,0x20},

    {SMART_CONFIG_CMD,0xC6},        //帧率
    {SMART_CONFIG_DATA,0x0F},

    {SMART_CONFIG_CMD,0xD0},        //功率控制模式   
    {SMART_CONFIG_DATA,0xA4},
    {SMART_CONFIG_DATA,0xA1},

    {SMART_CONFIG_CMD,0xE0},        //正GAMMA 
    {SMART_CONFIG_DATA,0xD0},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0x05},
    {SMART_CONFIG_DATA,0x03},
    {SMART_CONFIG_DATA,0x02},
    {SMART_CONFIG_DATA,0x07},
    {SMART_CONFIG_DATA,0x3F},
    {SMART_CONFIG_DATA,0x55},
    {SMART_CONFIG_DATA,0x50},
    {SMART_CONFIG_DATA,0x09},
    {SMART_CONFIG_DATA,0x14},
    {SMART_CONFIG_DATA,0x15},
    {SMART_CONFIG_DATA,0x22},
    {SMART_CONFIG_DATA,0x25},

    {SMART_CONFIG_CMD,0xE1},    //负GAMMA
    {SMART_CONFIG_DATA,0xD0},
    {SMART_CONFIG_DATA,0x00},
    {SMART_CONFIG_DATA,0x05},
    {SMART_CONFIG_DATA,0x03},
    {SMART_CONFIG_DATA,0x02},
    {SMART_CONFIG_DATA,0x07},
    {SMART_CONFIG_DATA,0x3F},
    {SMART_CONFIG_DATA,0x55},
    {SMART_CONFIG_DATA,0x54},
    {SMART_CONFIG_DATA,0x0C},
    {SMART_CONFIG_DATA,0x18},
    {SMART_CONFIG_DATA,0x14},
    {SMART_CONFIG_DATA,0x22},
    {SMART_CONFIG_DATA,0x25},

    {SMART_CONFIG_CMD,0x11},    // sleep out
    {SMART_CONFIG_UDELAY,120000},

    {SMART_CONFIG_CMD,0x29},//Display On
    {SMART_CONFIG_UDELAY,20000},
};
unsigned long New_truly_cmd_buf[]= {
     0x2C2C2C2C,
};


void switch_lcd_New(void)              //切换为ST7789V
{
    jzfb1_init_data.smart_config.data_table = New_ili9335_data_table;
    jzfb1_init_data.smart_config.length_data_table =  ARRAY_SIZE(New_ili9335_data_table);
    jzfb1_init_data.smart_config.write_gram_cmd = New_truly_cmd_buf; 
}
//... ...

查看jz_lcd_v13.c调用顺序

从uboot启动时,调用board_init_r()函数开始:

代码语言：javascript
复制
 -> board_init_r()
         -> stdio_init()
                  -> drv_lcd_init()                //初始化硬件LCD
                  -> drv_video_init()       　　    //绘制log

其中drv_lcd_init()中调用顺序为:

代码语言：javascript
复制
 -> drv_lcd_init()
          -> lcd_init()
             -> lcd_ctrl_init()                 // 位于drivers\video\jz_lcd\Jz_lcd_v13.c

所以,接下来,我们便来修改jz_lcd_v13.c,让uboot在初始化LCD之前,读LCD的ID,是否需要切换新屏参数

修改jz_lcd_v13.c

由于X1000的SLCD控制寄存器只能向LCD写命令/数据，没有读数据的寄存器,所以我们便需要使用GPIO来模拟时序,读出ID来

参考ST7789V数据手册,找到ID命令为04h:

参考ST7789V数据手册,找到读写8080时序图:

接下来开始改代码: 

代码语言：javascript
复制
//添加下面函数,通过GPIO模拟LCD寄存器,来实现读ID
void  gpio_setfunc(unsigned int gpioPort,enum gpio_function fun)
{

    enum gpio_port port; 
    
    switch((gpioPort /32))
    {
        case 0:    port = GPIO_PORT_A; break;
        case 1:    port = GPIO_PORT_B; break;
        case 2:    port = GPIO_PORT_C; break;
        case 3:    port = GPIO_PORT_D; break;
               default:
               port = GPIO_NR_PORTS;   break;
    }
    gpio_set_func(port, fun, 1<< (gpioPort % 32));

    if(fun == GPIO_OUTPUT0||fun == GPIO_OUTPUT1)　　
    {
      if(fun == GPIO_OUTPUT0)
        gpio_direction_output(gpioPort, 0);     
      else
          gpio_direction_output(gpioPort, 1);      
     }
}


static void write_SLCD_CD(int isCOMD,unsigned int value) //写命令/数据
{

    #define  SLCD_DC    20
    #define  SLCD_WR   17
    #define  SLCD_RD    16
    #define  SLCD_CS     18
    
    int i;
    gpio_direction_output(GPIO_PB(SLCD_CS), 1);     
    
    for( i=0;i<8;i++)
     {
           gpio_setfunc(GPIO_PA(i),GPIO_OUTPUT0);
         gpio_direction_output(GPIO_PA(i), (value>>i)&0x01);     
    }
    
    
    mdelay(10);
    
    if(isCOMD!=0)    //如果是写命令,则拉低DC脚
    {
        gpio_direction_output(GPIO_PB(SLCD_DC), 0);    
    }
    else
    {
        gpio_direction_output(GPIO_PB(SLCD_DC),1);    
    }
    gpio_direction_output(GPIO_PB(SLCD_WR), 0);     
    gpio_direction_output(GPIO_PB(SLCD_RD), 1);     

    gpio_direction_output(GPIO_PB(SLCD_CS), 0);     
    
    
    mdelay(4);
    gpio_direction_output(GPIO_PB(SLCD_WR), 1);     
    
    mdelay(7);
}

static unsigned int read_SLCD_DATA(void)   //读数据
{

    #define  SLCD_DC    20
    #define  SLCD_WR   17
    #define  SLCD_RD    16
    #define  SLCD_CS     18
    
    int i;
    int ret=0;

    gpio_direction_output(GPIO_PB(SLCD_CS), 1);     //取消片选
    
    for( i=0;i<8;i++)        //将data脚设为输入脚
     {
           gpio_setfunc(GPIO_PA(i),GPIO_INPUT); 
    }
    
    gpio_direction_output(GPIO_PB(SLCD_DC), 1);     
    gpio_direction_output(GPIO_PB(SLCD_WR), 1);     
    gpio_direction_output(GPIO_PB(SLCD_RD), 0);     

    gpio_direction_output(GPIO_PB(SLCD_CS), 0);     //选中片选
    
    mdelay(4);
    gpio_direction_output(GPIO_PB(SLCD_RD), 1);     
    for( i=0;i<8;i++)
    ret|=(gpio_get_value(GPIO_PA(i))<<i);
    mdelay(7);
    
    return ret;
}

static void lcd_func_init(int isRestore)
 {
    int i,n;
    #define  SLCD_DC    20
    #define  SLCD_WR   17
    #define  SLCD_RD    16
    #define  SLCD_TE     19            //input
     #define  SLCD_CS     18
       
 
      
     if(isRestore)                                //恢复管脚为LCD控制寄存器
     {
        for(i=0;i<8;i++)
         gpio_setfunc(GPIO_PA(i),GPIO_FUNC_1);

        gpio_setfunc(GPIO_PB(SLCD_DC),GPIO_FUNC_1);
        gpio_setfunc(GPIO_PB(SLCD_WR),GPIO_FUNC_1);
        gpio_setfunc(GPIO_PB(SLCD_RD),GPIO_FUNC_1);
        gpio_setfunc(GPIO_PB(SLCD_TE),GPIO_FUNC_1);
         gpio_setfunc(GPIO_PB(SLCD_CS),GPIO_FUNC_1);
        
    }
    else　　　　　　　　　　　　　　　　　　　　　　　　　　//设置为普通IO管脚
    {
        for(i=0;i<8;i++)
         gpio_setfunc(GPIO_PA(i),GPIO_OUTPUT0);

        gpio_setfunc(GPIO_PB(SLCD_DC),GPIO_OUTPUT0);
        gpio_setfunc(GPIO_PB(SLCD_WR),GPIO_OUTPUT0);
        gpio_setfunc(GPIO_PB(SLCD_RD),GPIO_OUTPUT0);
        gpio_setfunc(GPIO_PB(SLCD_TE),GPIO_INPUT);
         gpio_setfunc(GPIO_PB(SLCD_CS),GPIO_OUTPUT0);

            
          
    }

      mdelay(200);
}
    
static u8 Read_ID_isNewLcd(void)
{
    #define  SLCD_DC    20
    #define  SLCD_WR   17
    #define  SLCD_RD    16
    #define  SLCD_TE     19            //input
     #define  SLCD_CS     18
    
    u8 ret = 0;
    u8 IDH,IDL;
    lcd_func_init(0);   //设置LCD相关的引脚,设置为普通IO脚
    
    write_SLCD_CD(1,0x04);　　//写入0x04命令

    IDH = read_SLCD_DATA();
    IDL = read_SLCD_DATA();
    
    printf("Read ID: 0x%X 0x%X\r\n",IDH,IDL);
    IDH = read_SLCD_DATA();
    IDL = read_SLCD_DATA();
    
    printf("Read ID: 0x%X 0x%X\r\n",IDH,IDL);         
    
    if(IDL!=0x52)          //如果值!=0X52,则表示是旧屏ili9335
    {
        ret =1;
    }
     
    lcd_func_init(1);    //将lcd相关引脚配置为LCD控制脚
    mdelay(10);
    
    return ret;
}


extern void switch_lcd_New(void) ;
static int lcd_type_isNew=0; 
void set_lcd_type_from_cmdline(void)   //设置bootargs,向内核传递lcd_type参数
{
    if(lcd_type_isNew)    
    {
        run_command("set  bootargs "CONFIG_BOOTARGS" lcd_type=new ", 0);
    }

}

//在lcd_ctrl_init()函数里添加读ID函数
void lcd_ctrl_init(void *lcd_base)
{
          if(Read_ID_isNewLcd()==0)        //读ID,检测是否是新屏
    {
        printf("Read_ID_isNewLcd=0\r\n"); 
        switch_lcd_New();     //调用Lcd-ili9335_240x320.c的切换新屏参数的函数
        
        lcd_type_isNew=1;    
    }  
   //... ... 后面的代码不需要修改,因为后面便会根据LCD初始化参数表.来初始化LCD
}

上面的set_lcd_type_from_cmdline()函数需要在后面调用main_loop()的时候之前被调用,所以还需要修改board_init_r()函数(arch\mips\lib\Board.c ).

然后装上旧屏ili9335,启动uboot,查看读的屏幕ID,屏幕显示正常:

然后换为新屏,启动uboot,查看读的ID信息,log显示正常:

启动内核时,也可以看到传递给内核bootargs有我们新添的参数:

然后在内核中,便通过新参数再次设置屏参数表即可.

本文参与 腾讯云自媒体分享计划，分享自作者个人站点/博客。
原始发表：2018-08-09 ，如有侵权请联系 cloudcommunity@tencent.com 删除
其他

本文分享自 作者个人站点/博客 前往查看

如有侵权，请联系 cloudcommunity@tencent.com 删除。

本文参与 腾讯云自媒体分享计划  ，欢迎热爱写作的你一起参与！

其他
评论
登录后参与评论
0 条评论
热度
最新
登录 后参与评论
推荐阅读
LV.
文章
0
获赞
0
领券

腾讯云开发者

扫码关注腾讯云开发者

扫码关注腾讯云开发者

领取腾讯云代金券

热门产品

热门推荐

更多推荐

Copyright © 2013 - 2024 Tencent Cloud. All Rights Reserved. 腾讯云 版权所有 

深圳市腾讯计算机系统有限公司 ICP备案/许可证号：粤B2-20090059 深公网安备号 44030502008569

腾讯云计算（北京）有限责任公司 京ICP证150476号 |  京ICP备11018762号 | 京公网安备号11010802020287

问题归档专栏文章快讯文章归档关键词归档开发者手册归档开发者手册 Section 归档

Copyright © 2013 - 2024 Tencent Cloud.

All Rights Reserved. 腾讯云 版权所有

登录 后参与评论