入門linux之全志H3 nanopi 點亮ST7789VW IPS屏
- NanoPi-NEO-Air 入門
-
- Nnaopi的IO
- 裝置樹（sun8i-h3-nanopi-neo-air.dts）中禁用其他SPI節點和使能ST7789VW節點：
- 修改初始化函數
- 使用1.14（135*240）ips螢幕的注意修改函數set_addr_win
- 把驅動編譯進核心
- 編譯核心 裝置樹 下載下傳重新開機看效果
- 實際效果
- 播放視訊
- 運作QT
NanoPi-NEO-Air 入門
記錄一下第一次嘗試用linux點亮spi螢幕的過程，一共嘗試了0.96 ST7735S(80160) \1.8 st7735R(128160) \1.14 st7789v(135240) \1.3 st7789vw (240240)這幾個螢幕，有個奇怪的現象就是必須要接SPI0的CS引腳到顯示屏上才能正常顯示。
Nnaopi的IO
裝置樹（sun8i-h3-nanopi-neo-air.dts）中禁用其他SPI節點和使能ST7789VW節點：
在最後加上以下代碼，st7735r和st7735s也調試過可用，7735超過48M顯示的顔色就不正常了，7789vw可以96M正常顯示,原始的IO口是
DC PA1 RESET PG11 BL PA0
我改成了
DC PA1 RESET PA2 BL PA0
同時禁用hdmi，防止開機從hdmi顯示
&spi0{
spidev0:[email protected]{
status="disable";
};
st7789vw: [email protected]{
compatible = "sitronix,st7789vw";
reg = <0>;
status = "okay";
spi-max-frequency = <96000000>;
buswidth = <8>;
rotate = <0>;
fps = <60>;
rgb;
dc-gpios = <&pio 0 1 GPIO_ACTIVE_HIGH>; /* PA1 */
reset-gpios = <&pio 0 2 GPIO_ACTIVE_HIGH>; /* PA2*/
led-gpios = <&pio 0 0 GPIO_ACTIVE_LOW>; /* PA0 */
debug = <0x00>;
};
// st7735r: [email protected]{
// compatible = "sitronix,st7735r";
// reg = <0>;
// status = "okay";
// spi-max-frequency = <36000000>;
// spi-cpol;
// spi-cpha;
// rotate = <90>;
// fps = <60>;
// buswidth = <8>;
// dc-gpios = <&pio 0 1 GPIO_ACTIVE_HIGH>; /* PA1 */
// reset-gpios = <&pio 0 2 GPIO_ACTIVE_HIGH>; /* PA2*/
// led-gpios = <&pio 0 0 GPIO_ACTIVE_LOW>; /* PA0 */
// debug = <0x0>;
// };
// st7735s: [email protected]{
// compatible = "sitronix,st7735s";
// reg = <0>;
// status = "okay";
// spi-max-frequency = <36000000>;
// spi-cpol;
// spi-cpha;
// rotate = <0>;
// fps = <60>;
// buswidth = <8>;
// dc-gpios = <&pio 0 1 GPIO_ACTIVE_HIGH>; /* PA1 */
// reset-gpios = <&pio 0 2 GPIO_ACTIVE_HIGH>; /* PA2 */
// led-gpios = <&pio 0 0 GPIO_ACTIVE_LOW>; /* PA0 */
// debug = <0x0>;
// };
};
&hdmi {
status = "disable";
};
修改初始化函數
原始的初始化沒有複位顯示屏，在初始化中添加
par->fbtftops.reset(par);
write_reg(par, PVGAMCTRL, 0xD0, 0x04, 0x0D, 0x11, 0x13, 0x2B, 0x3F, 0x54, 0x4C, 0x18, 0x0D, 0x0B, 0x1F, 0x23);
write_reg(par, NVGAMCTRL, 0xD0, 0x04, 0x0C, 0x11, 0x13, 0x2C, 0x3F, 0x44, 0x51, 0x2F, 0x1F, 0x1F, 0x20, 0x23);
static int init_display(struct fbtft_par *par)
{
par->fbtftops.reset(par);
// /* turn off sleep mode */
write_reg(par, MIPI_DCS_EXIT_SLEEP_MODE);
mdelay(120);
write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, 0x0);
write_reg(par, MIPI_DCS_SET_PIXEL_FORMAT, MIPI_DCS_PIXEL_FMT_16BIT);
write_reg(par, PORCTRL, 0x0C, 0x0C, 0x00, 0x33, 0x33);
write_reg(par, GCTRL, 0x35);
write_reg(par, VCOMS, 0x19);
write_reg(par, LCMCTRL, 0x2C);
write_reg(par, VDVVRHEN, 0x01);
write_reg(par, VRHS, 0x12);
write_reg(par, VDVS, 0x20);
write_reg(par, FRCTRL2, 0x0F);
write_reg(par, PWCTRL1, 0xA4, 0xA1);
write_reg(par, PVGAMCTRL, 0xD0, 0x04, 0x0D, 0x11, 0x13, 0x2B, 0x3F, 0x54, 0x4C, 0x18, 0x0D, 0x0B, 0x1F, 0x23);
write_reg(par, NVGAMCTRL, 0xD0, 0x04, 0x0C, 0x11, 0x13, 0x2C, 0x3F, 0x44, 0x51, 0x2F, 0x1F, 0x1F, 0x20, 0x23);
write_reg(par, MIPI_DCS_ENTER_INVERT_MODE);
write_reg(par, MIPI_DCS_SET_DISPLAY_ON);
mdelay(120);
return 0;
}
使用1.14（135*240）ips螢幕的注意修改函數set_addr_win
原始的函數沒有糾正偏移量，增加以下代碼（隻有135*240的需要增加，其他的屏不需要）：
switch(par->info->var.rotate)
{
case 0: xs+=53;xe+=53;ys+=40;ye+=40;
break;
case 90: xs+=40;xe+=40;ys+=53;ye+=53;
break;
case 180: xs+=53;xe+=53;ys+=40;ye+=40;
break;
case 270: xs+=40;xe+=40;ys+=53;ye+=53;
break;
default :
break;
}
把驅動編譯進核心
最原始的核心沒有ST7789VW，隻有ST7789V，是以把st7789v.c複制粘貼改名為st7789vw.c，相應驅動做一下修改,并且修改fbtft目錄下的Kconfig和Makefile，這裡我增加了ST7789VW和ST7735S的驅動
config FB_TFT_ST7789VW
tristate "FB driver for the ST7789VW LCD Controller"
depends on FB_TFT
help
This enables generic framebuffer support for the Sitronix ST7789VW
display controller. The controller is intended for small color
displays with a resolution of up to 240x240 pixels.
Say Y if you have such a display that utilizes this controller.
Makefile:
Kconfig:
再到menuconfig使能此驅動，
make menuconfig ARCH=arm CROSS_COMPILE=arm-linux- -j80
Device Drivers --->
[*] Staging drivers --->
<*> Support for small TFT LCD display modules --->
<*> FB driver for the ST7789VW LCD Controller
編譯核心 裝置樹 下載下傳重新開機看效果
make zImage dtbs ARCH=arm CROSS_COMPILE=arm-linux- -j80
網絡更新核心
scp arch/arm/boot/zImage [email protected]:/boot
網絡更新裝置樹
scp arch/arm/boot/dts/sun8i-h3-nanopi-neo-air.dtb [email protected]:/boot
[linux]全志H3 nanopi 點亮ST7789VW IPS屏NanoPi-NEO-Air 入門
實際效果
1.3寸 240*240 IPS效果：
播放視訊
mplayer badapple_320_240_15fps.avi -vo fbdev
運作QT
apt-get update && apt-get install git
git clone https://github.com/friendlyarm/matrix.git
cd matrix/demo/nanopi-status
./build.sh
./run.sh /dev/fb_st7789vw