由于我看中了一款小屏幕
希望把他移植到我的nano上面来
其实目前我也只是自己刚编译好系统能进入linux而已
可是这款屏幕的芯片是gc9a01
fbtft里面没有提供对应的驱动
我也不知道如何编写
只是照着stm32代码写了init_display函数
我实在是不知道fbtft_display里面的set_var咋写了
准确的说,我其实啥都不知道,请问下我现在应该怎么用最简单的方式驱动这个屏幕呢?
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这是stm32的代码
LCD_WR_REG(0xEF);
LCD_WR_REG(0xEB);
LCD_WR_DATA8(0x14);
这是我弄成fbtft init_display 里面的代码
write_reg(par,0xEF);
write_reg(par,0xEB,0x14);
不知道对不对
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我现在已经改成这样了,然后怎么开始测试呢?
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <video/mipi_display.h>
#include "fbtft.h"
#define DRVNAME "fb_gc9a01"
#define WIDTH 240
#define HEIGHT 240
#define ORIENTATION 2 // Set the display orientation 0,1,2,3
// Command codes:
#define COL_ADDR_SET 0x2A
#define ROW_ADDR_SET 0x2B
#define MEM_WR 0x2C
#define COLOR_MODE 0x3A
#define COLOR_MODE__12_BIT 0x03
#define COLOR_MODE__16_BIT 0x05
#define COLOR_MODE__18_BIT 0x06
#define MEM_WR_CONT 0x3C
static int init_display(struct fbtft_par *par)
{
par->fbtftops.reset(par);
write_reg(par,0xEF);
write_reg(par,0xEB,0x14);
write_reg(par,0xEF);
write_reg(par,0xEF);
write_reg(par,0xEB,0x14);
write_reg(par,0x84,0x40);
write_reg(par,0x85,0xFF);
write_reg(par,0x86,0xFF);
write_reg(par,0x87,0xFF);
write_reg(par,0x88,0x0A);
write_reg(par,0x89,0x21);
write_reg(par,0x8A,0x00);
write_reg(par,0x8B,0x80);
write_reg(par,0x8C,0x01);
write_reg(par,0x8D,0x01);
write_reg(par,0x8E,0xFF);
write_reg(par,0x8F,0xFF);
write_reg(par,0xB6,0x00,0x20); // used 0x00
write_reg(par,0x36);
#if ORIENTATION == 0
write_reg(par,0x18);
#elif ORIENTATION == 1
write_reg(par,0x28);
#elif ORIENTATION == 2
write_reg(par,0x08); //0x48
#else
write_reg(par,0x88);
#endif
write_reg(par,COLOR_MODE,COLOR_MODE__18_BIT);
write_reg(par,0x90,0x08,0x08,0x08,0x08);
write_reg(par,0xBD,0x06);
write_reg(par,0xBC,0x00);
write_reg(par,0xFF,0x60,0x01,0x04);
write_reg(par,0xC3,0x13);
write_reg(par,0xC4,0x13);
write_reg(par,0xC9,0x22);
write_reg(par,0xBE,0x11);
write_reg(par,0xE1,0x10,0x0E);
write_reg(par,0xDF,0x21,0x0c,0x02);
write_reg(par,0xF0,0x45,0x09,0x08,0x08,0x26,0x2A);
write_reg(par,0xF1,0x43,0x70,0x72,0x36,0x37,0x6F);
write_reg(par,0xF2,0x45,0x09,0x08,0x08,0x26,0x2A);
write_reg(par,0xF3,0x43,0x70,0x72,0x36,0x37,0x6F);
write_reg(par,0xED,0x1B,0x0B);
write_reg(par,0xAE,0x77);
write_reg(par,0xCD,0x63);
write_reg(par,0x70,0x07,0x07,0x04,0x0E,0x0F,0x09,0x07,0x08,0x03);
write_reg(par,0xE8,0x34);
write_reg(par,0x62,0x18,0x0D,0x71,0xED,0x70,0x70,0x18,0x0F,0x71,0xEF,0x70,0x70);
write_reg(par,0x63,0x18,0x11,0x71,0xF1,0x70,0x70,0x18,0x13,0x71,0xF3,0x70,0x70);
write_reg(par,0x64,0x28,0x29,0xF1,0x01,0xF1,0x00,0x07);
write_reg(par,0x66,0x3C,0x00,0xCD,0x67,0x45,0x45,0x10,0x00,0x00,0x00);
write_reg(par,0x67,0x00,0x3C,0x00,0x00,0x00,0x01,0x54,0x10,0x32,0x98);
write_reg(par,0x74,0x10,0x85,0x80,0x00,0x00,0x4E,0x00);
write_reg(par,0x98,0x3e,0x07);
write_reg(par,0x35,0x21);
write_reg(par,0x11);
mdelay(120);
write_reg(par,0x29);
mdelay(20);
return 0;
}
static void set_addr_win(struct fbtft_par *par, int xs, int ys, int xe, int ye)
{
write_reg(par, MIPI_DCS_SET_COLUMN_ADDRESS,
xs >> 8, xs & 0xff, xe >> 8, xe & 0xff);
write_reg(par, MIPI_DCS_SET_PAGE_ADDRESS,
ys >> 8, ys & 0xff, ye >> 8, ye & 0xff);
write_reg(par, MIPI_DCS_WRITE_MEMORY_START);
}
static int set_var(struct fbtft_par *par)
{
switch (par->info->var.rotate) {
case 0:
write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
0x80 | (par->bgr << 3));
break;
case 90:
write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
0x20 | (par->bgr << 3));
break;
case 180:
write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
0x40 | (par->bgr << 3));
break;
case 270:
write_reg(par, MIPI_DCS_SET_ADDRESS_MODE,
0xE0 | (par->bgr << 3));
break;
default:
break;
}
return 0;
}
static struct fbtft_display display = {
.regwidth = 8,
.width = WIDTH,
.height = HEIGHT,
.fbtftops = {
.init_display = init_display,
.set_addr_win = set_addr_win,
.set_var = set_var,
},
};
FBTFT_REGISTER_DRIVER(DRVNAME, "gc9a01", &display);
MODULE_ALIAS("spi:" DRVNAME);
MODULE_ALIAS("platform:" DRVNAME);
MODULE_ALIAS("spi:gc9a01");
MODULE_ALIAS("platform:gc9a01");
MODULE_DESCRIPTION("FB driver for the GC9A01 LCD Controller");
MODULE_AUTHOR("tlxfif");
MODULE_LICENSE("GPL");
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荔枝派Zero V3s开发板驱动 ili9341 摆拍
https://whycan.com/t_576.htmllinux5.2内核,配置SPI屏幕(ili9341)步骤
https://whycan.com/t_6412.html
多谢,请问下这里怎么填写呢?
reset-gpios = <&pio 【1】 【2】 GPIO_ACTIVE_LOW>;
我不太清楚硬件上写的E3/E4/E5对应的数字是多少
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那个是复位脚定义,
前面那个数字代表 A B C ..
后面数字代表引脚号PE3
那应该是
4 3
好滴,多谢多谢
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大佬请问你设备树是咋写的呀?可以分享下吗
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