覆盖 LCD TFT 3.2 英寸 HY32D 使其适用于 Beagle Bone Black答案

【问题标题】：Overlay LCD TFT 3.2 inch HY32D make it works on Beagle Bone Black覆盖 LCD TFT 3.2 英寸 HY32D 使其适用于 Beagle Bone Black
【发布时间】：2015-03-04 08:24:05
【问题描述】：

我正在寻求一些帮助，以便在 Beagle Bone Black 上制作 LCD HY32D。

我在 BBB 的以下 PIN 上连接了这个名为 HY32D 的 LCD：

    "P8.45",    // lcd: lcd_data0 
    "P8.46",    // lcd: lcd_data1 
    "P8.43",    // lcd: lcd_data2 
    "P8.44",    // lcd: lcd_data3 
    "P8.41",    // lcd: lcd_data4 
    "P8.42",    // lcd: lcd_data5 
    "P8.39",    // lcd: lcd_data6 
    "P8.40",    // lcd: lcd_data7 
    "P8.37",    // lcd: lcd_data8 
    "P8.38",    // lcd: lcd_data9 
    "P8.36",    // lcd: lcd_data10 
    "P8.34",    // lcd: lcd_data11 
    "P8.35",    // lcd: lcd_data12 
    "P8.33",    // lcd: lcd_data13 
    "P8.31",    // lcd: lcd_data14 
    "P8.32",    // lcd: lcd_data15 

    "P9.12",    // lcd RS: gpio1_28 
    "P9.42A",   // lcd RD: gpio0_7 
    "P8.14",    // lcd WR: gpio0_26
    "P8.16",    // lcd RESET: gpio1_14

然后我找到了一个名为cape-bone-lcd3-00A0.dts 的叠加层，我确实尝试对其进行编辑以适应 LCD HY32D，

这里是修改后的 dts： http://support.rfberrypi.com/download/BB-LCD-HY32D-00A0.dts

但我在编写叠加层方面没有太多经验，我的主要问题是如何将视频输出重定向到此叠加层？

【问题讨论】：

标签： touch beagleboneblack lcd

【解决方案1】：

我已经解决了关于 LCD 驱动程序的问题。首先我写了覆盖：

/dts-v1/;
/plugin/;

/{
       compatible = "ti,beaglebone", "ti,beaglebone-black";
       part-number = "lcd_my_try";
       version = "00A0";

       fragment@0 {
             target = <&am33xx_pinmux>;

             __overlay__ {
                  pinctrl_test: lcd_my_try_Pins {
            pinctrl-single,pins = <

                    0xa0 0x2f   /* lcd_data0.lcd_data0, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */
                    0xa4 0x2f   /* lcd_data1.lcd_data1, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */
                    0xa8 0x2f   /* lcd_data2.lcd_data2, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */
                    0xac 0x2f   /* lcd_data3.lcd_data3, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */
                    0xb0 0x2f   /* lcd_data4.lcd_data4, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */
                    0xb4 0x2f   /* lcd_data5.lcd_data5, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */
                    0xb8 0x2f   /* lcd_data6.lcd_data6, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */
                    0xbc 0x2f   /* lcd_data7.lcd_data7, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */
                    0xc0 0x2f   /* lcd_data8.lcd_data8, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */
                    0xc4 0x2f   /* lcd_data9.lcd_data9, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */
                    0xc8 0x2f   /* lcd_data10.lcd_data10, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */
                    0xcc 0x2f   /* lcd_data11.lcd_data11, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */
                    0xd0 0x2f   /* lcd_data12.lcd_data12, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */
                    0xd4 0x2f   /* lcd_data13.lcd_data13, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */
                    0xd8 0x2f   /* lcd_data14.lcd_data14, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */
                    0xdc 0x2f   /* lcd_data15.lcd_data15, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT | AM33XX_PULL_DISA */

                    0x78 0x2f   // lcd_rs.lcd_rs, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT 
                    0x164 0x2f  // lcd_rd.lcd_rd, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT 
                    0x28 0x2f   // lcd_wr.lcd_wr, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT 
                    0x38 0x2f   // lcd_reset.lcd_reset, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT 
                    0x30 0x2f   // lcd_cs.lcd_cs, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT 

                    0xec 0x07   // lcd_ac_bias_en.gpio2_25 OMAP_MUX_MODE7 | AM33XX_PIN_OUTPUT 

                    //touch panel ADS7843 = XPT2046
                    0x34 0x2f   // touch_cs.gpio1_13, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT (chip select)
                    0x7c 0x2f   // touch_sck.gpio1_29, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT (clock)
                    0x3c 0x2f   // touch_si.gpio1_15, OMAP_MUX_MODE0 | AM33XX_PIN_OUTPUT (serial data in)

                    0x8c 0x2f   // touch_irq.gpio2_1, OMAP_MUX_MODE0 | AM33XX_PIN_INPUT (interrupt on touch)
                    0x2c 0x2f   // touch_so.gpio0_27, OMAP_MUX_MODE0 | AM33XX_PIN_INPUT (serial data output)


            >;
          };
             };
       };

       fragment@1 {
        target = <&ocp>;
        __overlay__ {
            test_helper: helper {
                compatible = "bone-pinmux-helper";
                pinctrl-names = "default";
                pinctrl-0 = <&pinctrl_test>;
                status = "okay";
            };
        };
    };
};

我把它命名为：

lcd_my_try.dts

我已经用这个命令在 BBB 上编译了它：

dtc -O dtb -o lcd_my_try-00A0.dtbo -b 0 -@ lcd_my_try.dts

然后我加载它：

cp lcd_my_try-00A0.dtbo /lib/firmware echo lcd_my_try > /sys/devices/bone_capemgr*/slots

我已经加载了与 bash 文件一起使用的 GPIO 的名称，其内容如下：

#!/bin/bash

echo "Loading GPIO into /sys/class/gpio/export"

echo "Setting UP LCD_DATA_0"
echo 70 > /sys/class/gpio/export
echo "out" > /sys/devices/virtual/gpio/gpio70/direction

echo "Setting UP LCD_DATA_1"
echo 71 > /sys/class/gpio/export
echo "out" > /sys/devices/virtual/gpio/gpio71/direction

echo "Setting UP LCD_DATA_2"
echo 72 > /sys/class/gpio/export
echo "out" > /sys/devices/virtual/gpio/gpio72/direction

echo "Setting UP LCD_DATA_3"
echo 73 > /sys/class/gpio/export
echo "out" > /sys/devices/virtual/gpio/gpio73/direction

echo "Setting UP LCD_DATA_4"
echo 74 > /sys/class/gpio/export
echo "out" > /sys/devices/virtual/gpio/gpio74/direction

echo "Setting UP LCD_DATA_5"
echo 75 > /sys/class/gpio/export
echo "out" > /sys/devices/virtual/gpio/gpio75/direction

echo "Setting UP LCD_DATA_6"
echo 76 > /sys/class/gpio/export
echo "out" > /sys/devices/virtual/gpio/gpio76/direction

echo "Setting UP LCD_DATA_7"
echo 77 > /sys/class/gpio/export
echo "out" > /sys/devices/virtual/gpio/gpio77/direction

echo "Setting UP LCD_DATA_8"
echo 78 > /sys/class/gpio/export
echo "out" > /sys/devices/virtual/gpio/gpio78/direction

echo "Setting UP LCD_DATA_9"
echo 79 > /sys/class/gpio/export
echo "out" > /sys/devices/virtual/gpio/gpio79/direction

echo "Setting UP LCD_DATA_10"
echo 80 > /sys/class/gpio/export
echo "out" > /sys/devices/virtual/gpio/gpio80/direction

echo "Setting UP LCD_DATA_11"
echo 81 > /sys/class/gpio/export
echo "out" > /sys/devices/virtual/gpio/gpio81/direction

echo "Setting UP LCD_DATA_12"
echo 8 > /sys/class/gpio/export
echo "out" > /sys/devices/virtual/gpio/gpio8/direction

echo "Setting UP LCD_DATA_13"
echo 9 > /sys/class/gpio/export
echo "out" > /sys/devices/virtual/gpio/gpio9/direction

echo "Setting UP LCD_DATA_14"
echo 10 > /sys/class/gpio/export
echo "out" > /sys/devices/virtual/gpio/gpio10/direction

echo "Setting UP LCD_DATA_15"
echo 11 > /sys/class/gpio/export
echo "out" > /sys/devices/virtual/gpio/gpio11/direction

echo "Setting UP LCD_RS"
echo 60 > /sys/class/gpio/export
echo "out" > /sys/devices/virtual/gpio/gpio60/direction

echo "Setting UP LCD_RD"
echo 7 > /sys/class/gpio/export
echo "out" > /sys/devices/virtual/gpio/gpio7/direction

echo "Setting UP LCD_WR"
echo 26 > /sys/class/gpio/export
echo "out" > /sys/devices/virtual/gpio/gpio26/direction

echo "Setting UP LCD_RESET"
echo 46 > /sys/class/gpio/export
echo "out" > /sys/devices/virtual/gpio/gpio46/direction

echo "Setting UP LCD_CS"
echo 44 > /sys/class/gpio/export
echo "out" > /sys/devices/virtual/gpio/gpio44/direction

echo "Setting UP LCD_BLVDD"
echo 89 > /sys/class/gpio/export
echo "out" > /sys/devices/virtual/gpio/gpio89/direction

echo "----TOUCH PANEL----"
echo "Setting UP TOUCH_CS"
echo 45 > /sys/class/gpio/export
echo "out" > /sys/devices/virtual/gpio/gpio45/direction

echo "Setting UP TOUCH_SCK"
echo 61 > /sys/class/gpio/export
echo "out" > /sys/devices/virtual/gpio/gpio61/direction

echo "Setting UP TOUCH_SI"
echo 47 > /sys/class/gpio/export
echo "out" > /sys/devices/virtual/gpio/gpio47/direction

echo "Setting UP TOUCH_IRQ"
echo 65 > /sys/class/gpio/export
echo "in" > /sys/devices/virtual/gpio/gpio65/direction

echo "Setting UP TOUCH_SO"
echo 27 > /sys/class/gpio/export
echo "in" > /sys/devices/virtual/gpio/gpio27/direction

我终于准备好在 LCD 上写字了！

【讨论】：