ST7789 linux4.x驱动
ST7789 linux4.x驱动
设备树配置
pinctrl_ecspi2_cs_1: ecspi2_cs_grp-1 {
fsl,pins = <
MX6UL_PAD_CSI_DATA01__GPIO4_IO220x40017059
>;
};
pinctrl_ecspi2_1: escpi2grp {
fsl,pins = <
MX6UL_PAD_CSI_DATA00__ECSPI2_SCLK0x100b1
MX6UL_PAD_CSI_DATA02__ECSPI2_MOSI0x100b1
MX6UL_PAD_CSI_DATA03__ECSPI2_MISO0x100b1
>;
};
&ecspi2 {
fsl,spi-num-chipselects = <1>;
cs-gpios = <&gpio4 22 0>;
pinctrl-names = "default";
pinctrl-0 = <&pinctrl_ecspi2_1 &pinctrl_ecspi2_cs_1>;
status = "okay";
fbftf: st7789v@0 {
compatible = "sitronix,st7789v";
spi-max-frequency = <8000000>;
dc-gpios = <&gpio3 23 GPIO_ACTIVE_HIGH>;
rst-gpio = <&gpio2 22 GPIO_ACTIVE_HIGH>;
led-gpios = <&gpio2 19 GPIO_ACTIVE_LOW>;
reg = <0>;
//bgr = <1>;
//rotate = <0>;
buswidth = <8>;
//width = <240>;
//height= <320>;
//debug = <0>;
fps = <60>;
};
};
驱动程序
drivers/staging/fbtft/fb_st7789v.c
/*
* FB driver for the ST7789V LCD Controller
*
* Copyright (C) 2015 Dennis Menschel
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/bitops.h>
#include <linux/delay.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <video/mipi_display.h>
#include "fbtft.h"
#define DRVNAME "fb_st7789v"
/*#define DEFAULT_GAMMA \
"70 2C 2E 15 10 09 48 33 53 0B 19 18 20 25\n" \
"70 2C 2E 15 10 09 48 33 53 0B 19 18 20 25"*/
#define DEFAULT_GAMMA \
"f0 00 0a 10 12 1b 39 44 47 28 12 10 16 1b\n" \
"f0 00 0a 10 11 1a 3b 34 4e 3a 17 16 21 22"
/**
* enum st7789v_command - ST7789V display controller commands
*
* @PORCTRL: porch setting
* @GCTRL: gate control
* @VCOMS: VCOM setting
* @VDVVRHEN: VDV and VRH command enable
* @VRHS: VRH set
* @VDVS: VDV set
* @VCMOFSET: VCOM offset set
* @PWCTRL1: power control 1
* @PVGAMCTRL: positive voltage gamma control
* @NVGAMCTRL: negative voltage gamma control
*
* The command names are the same as those found in the datasheet to ease
* looking up their semantics and usage.
*
* Note that the ST7789V display controller offers quite a few more commands
* which have been omitted from this list as they are not used at the moment.
* Furthermore, commands that are compliant with the MIPI DCS have been left
* out as well to avoid duplicate entries.
*/
enum st7789v_command {
PORCTRL = 0xB2,
GCTRL = 0xB7,
VCOMS = 0xBB,
VDVVRHEN = 0xC2,
VRHS = 0xC3,
VDVS = 0xC4,
VCMOFSET = 0xC5,
PWCTRL1 = 0xD0,
PVGAMCTRL = 0xE0,
NVGAMCTRL = 0xE1,
};
#define MADCTL_BGR BIT(3) /* bitmask for RGB/BGR order */
#define MADCTL_MV BIT(5) /* bitmask for page/column order */
#define MADCTL_MX BIT(6) /* bitmask for column address order */
#define MADCTL_MY BIT(7) /* bitmask for page address order */
/**
* init_display() - initialize the display controller
*
* @par: FBTFT parameter object
*
* Most of the commands in this init function set their parameters to the
* same default values which are already in place after the display has been
* powered up. (The main exception to this rule is the pixel format which
* would default to 18 instead of 16 bit per pixel.)
* Nonetheless, this sequence can be used as a template for concrete
* displays which usually need some adjustments.
*
* Return: 0 on success, < 0 if error occurred.
*/
static int init_display(struct fbtft_par *par)
{
/* turn off sleep mode */
write_reg(par, MIPI_DCS_EXIT_SLEEP_MODE);
mdelay(120);
write_reg(par, 0xb2, 0x0c, 0x0c, 0x00, 0x33, 0x33);
write_reg(par, 0xb7, 0x35);
write_reg(par, 0xbb, 0x33);
write_reg(par, 0xc3, 0x1a);
write_reg(par, 0xc4, 0x18);
write_reg(par, 0xc6, 0x01);
write_reg(par, 0xd0, 0xa4, 0xb3);
write_reg(par, 0xe0, 0xf0, 0x00, 0x0a, 0x10, 0x12, 0x1b, 0x39, 0x44, 0x47, 0x28, 0x12, 0x10, 0x16, 0x1b);
write_reg(par, 0xe1, 0xf0, 0x00, 0x0a, 0x10, 0x11, 0x1a, 0x3b, 0x34, 0x4e, 0x3a, 0x17, 0x16, 0x21, 0x22);
write_reg(par, 0x3a, 0x55);
write_reg(par, 0x2a, 0x00, 0x00, 0x00, 0xef);
write_reg(par, 0x2b, 0x00, 0x00, 0x01, 0x3f);
write_reg(par, 0x21);
write_reg(par, 0x29);
write_reg(par, 0x2c);
return 0;
}
/**
* set_var() - apply LCD properties like rotation and BGR mode
*
* @par: FBTFT parameter object
*
* Return: 0 on success, < 0 if error occurred.
*/
static int set_var(struct fbtft_par *par)
{
u8 madctl_par = 0;
if (par->bgr)
madctl_par |= MADCTL_BGR;
switch (par->info->var.rotate) {
case 0:
break;
case 90:
madctl_par |= (MADCTL_MV | MADCTL_MY);
break;
case 180:
madctl_par |= (MADCTL_MX | MADCTL_MY);
break;
case 270:
madctl_par |= (MADCTL_MV | MADCTL_MX);
break;
default:
return -EINVAL;
}
write_reg(par, MIPI_DCS_SET_ADDRESS_MODE, madctl_par);
return 0;
}
/**
* set_gamma() - set gamma curves
*
* @par: FBTFT parameter object
* @curves: gamma curves
*
* Before the gamma curves are applied, they are preprocessed with a bitmask
* to ensure syntactically correct input for the display controller.
* This implies that the curves input parameter might be changed by this
* function and that illegal gamma values are auto-corrected and not
* reported as errors.
*
* Return: 0 on success, < 0 if error occurred.
*/
static int set_gamma(struct fbtft_par *par, unsigned long *curves)
{
int i;
int j;
int c; /* curve index offset */
/*
* Bitmasks for gamma curve command parameters.
* The masks are the same for both positive and negative voltage
* gamma curves.
*/
const u8 gamma_par_mask[] = {
0xFF, /* V63[3:0], V0[3:0]*/
0x3F, /* V1[5:0] */
0x3F, /* V2[5:0] */
0x1F, /* V4[4:0] */
0x1F, /* V6[4:0] */
0x3F, /* J0[1:0], V13[3:0] */
0x7F, /* V20[6:0] */
0x77, /* V36[2:0], V27[2:0] */
0x7F, /* V43[6:0] */
0x3F, /* J1[1:0], V50[3:0] */
0x1F, /* V57[4:0] */
0x1F, /* V59[4:0] */
0x3F, /* V61[5:0] */
0x3F, /* V62[5:0] */
};
for (i = 0; i < par->gamma.num_curves; i++) {
c = i * par->gamma.num_values;
for (j = 0; j < par->gamma.num_values; j++)
curves[c + j] &= gamma_par_mask[j];
write_reg(
par, PVGAMCTRL + i,
curves[c + 0], curves[c + 1], curves[c + 2],
curves[c + 3], curves[c + 4], curves[c + 5],
curves[c + 6], curves[c + 7], curves[c + 8],
curves[c + 9], curves[c + 10], curves[c + 11],
curves[c + 12], curves[c + 13]);
}
return 0;
}
/**
* blank() - blank the display
*
* @par: FBTFT parameter object
* @on: whether to enable or disable blanking the display
*
* Return: 0 on success, < 0 if error occurred.
*/
static int blank(struct fbtft_par *par, bool on)
{
if (on)
write_reg(par, MIPI_DCS_SET_DISPLAY_OFF);
else
write_reg(par, MIPI_DCS_SET_DISPLAY_ON);
return 0;
}
static struct fbtft_display display = {
.regwidth = 8,
.width = 240,
.height = 320,
.gamma_num = 2,
.gamma_len = 14,
.gamma = DEFAULT_GAMMA,
.fbtftops = {
.init_display = init_display,
.set_var = set_var,
.set_gamma = set_gamma,
.blank = blank,
},
};
FBTFT_REGISTER_DRIVER(DRVNAME, "sitronix,st7789v", &display);
MODULE_ALIAS("spi:" DRVNAME);
MODULE_ALIAS("platform:" DRVNAME);
MODULE_ALIAS("spi:st7789v");
MODULE_ALIAS("platform:st7789v");
MODULE_DESCRIPTION("FB driver for the ST7789V LCD Controller");
MODULE_AUTHOR("Dennis Menschel");
MODULE_LICENSE("GPL");
drivers/staging/fbtft/Makefile
obj-$(CONFIG_FB_TFT_ST7789V) += fb_st7789v.o
drivers/staging/fbtft/Kconfig
config FB_TFT_ST7789V
tristate "FB driver for the ST7789V LCD Controller"
depends on FB_TFT
help
This enables generic framebuffer support for the Sitronix ST7789V
display controller. The controller is intended for small color
displays with a resolution of up to 320x240 pixels.
Say Y if you have such a display that utilizes this controller.
编译驱动
make ARCH=arm menuconfig
make ARCH=arm -j8
测试驱动
fb-test
fb-test 1.1.1 (rosetta)
fb res 240x320 virtual 240x320, line_len 480, bpp 16
原文地址：https://blog.csdn.net/qq_35762024/article/details/140287065
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