SDK下载和环境搭建
如果提示 Username for : 请输入 全志在线开发者论坛 的用户名和密码。(注:需要全志在线开发者论坛LV2等级以上用户才有权限拉取 SDK,随便注册个账户,灌灌水就到了)
由于 SDK 普遍较大,拉取可能需要一定的时间。
接下来安装环境依赖(我用Buildroot的docker容器,都装过了,就不需要再搞了)
sudo apt-get install build-essential subversion git libncurses5-dev zlib1g-dev gawk flex bison quilt libssl-dev xsltproc libxml-parser-perl mercurial bzr ecj cvs unzip lsof kconfig-frontends android-tools-mkbootimg python2 libpython3-dev gcc-multilib libc6:i386 libstdc++6:i386 lib32z1
然后配置工具链,直接下载gcc-arm-none-eabi-8-2019-q3-update-linux.tar.bz2 压缩包并解压缩到~/.bin目录下,并修改gcc.mk文件
# ----------------------------------------------------------------------------
# cross compiler
# ----------------------------------------------------------------------------
CC_DIR := /home/vuser/.bin/gcc-arm-8.3/bin/
CC_PREFIX := ccache $(CC_DIR)/arm-none-eabi-
这样就配置好了。看了一下project/example目录下,有个spi工程,适合拿来修改,就是它了。
移植st7789驱动
ST7789是一款高度集成的彩色TFT液晶显示屏控制器芯片,通常用于驱动小到中等尺寸的液晶屏。例如淘宝上常见的1.4寸、1.47寸、1.69寸屏幕等等。
现在就开始吧,首先新建st7789.c和st7789.h文件。然后创建用于初始化st7789芯片的命令序列表。
static lcd_init_cmd_t st7789_init_cmds[] = {
{0x01, {0}, 0x80, 120},
/* Sleep Out */
{0x11, {0}, 0x80, 120},
/* Memory Data Access Control, MX=MV=1, MY=ML=MH=0, RGB=0 */
{0x36, {0x00}, 1},
/* Interface Pixel Format, 16bits/pixel for RGB/MCU interface */
{0x3A, {0x05}, 1},
#if 0
{0x30, {0x00,0x50,0x01,0x3F}, 4},
{0x12, {0x00}, 0},
#endif
/* Porch Setting */
{0xB2, {0x0c, 0x0c, 0x00, 0x33, 0x33}, 5},
/* Gate Control, Vgh=13.65V, Vgl=-10.43V */
{0xB7, {0x35}, 1},
/* VCOM Setting, VCOM=1.35V */
{0xBB, {0x32}, 1},
// /* LCM Control, XOR: BGR, MX, MH */
// {0xC0, {0x2C}, 1},
/* VDV and VRH Command Enable, enable=1 */
{0xC2, {0x01, 0xFF}, 2},
/* VRH Set, Vap=4.4+... */
{0xC3, {0x15}, 1},
/* VDV Set, VDV=0 */
{0xC4, {0x20}, 1},
/* Frame Rate Control, 60Hz, inversion=0 */
{0xC6, {0x0F}, 1},
/* Power Control 1, AVDD=6.8V, AVCL=-4.8V, VDDS=2.3V */
{0xD0, {0xA4, 0xA1}, 1},
/* Positive Voltage Gamma Control */
{0xE0,
{0xD0, 0x08, 0x0E, 0x09, 0x09, 0x05, 0x31, 0x33, 0x48, 0x17, 0x14, 0x15,
0x31, 0x34},
14},
/* Negative Voltage Gamma Control */
{0xE1,
{0xD0, 0x08, 0x0E, 0x09, 0x09, 0x15, 0x31, 0x33, 0x48, 0x17, 0x14, 0x15,
0x31, 0x34},
14},
/* Display On */
{0x21, {0}, 0},
{0x29, {0}, 0},
{0, {0}, 0xff}};
这个序列表使用的是这样的数据结构
/*The LCD needs a bunch of command/argument values to be initialized. They are
* stored in this struct. */
typedef struct {
# 指令
uint8_t cmd;
# 数据
uint8_t data[16];
# 数据长度和类型,一般初始化数据不会很长,使用部分做其他用。
# 例如 0x80代表需要延时,延时时间由delaytime指定,0xFF代表结束
uint8_t databytes; // No of data in data; bit 7 = delay after set; 0xFF =
// end of cmds.
uint8_t delaytime; // delaytime
} lcd_init_cmd_t;
然后编写初始化函数,这里把gpio和spi的初始化都放在里面了。
printf("ST7789 initialization.n");
int ret = dirver_spi_init();
if (ret != 0) {
printf("SPI dev init fail!n");
}
gpio_init(disp_pin_dc);
gpio_init(disp_pin_rst);
gpio_init(disp_pin_bckl);
HAL_SPI_CS(DEMO_SPI_PORT, 1);
// Reset the displayc
gpio_set_level(disp_pin_rst, 1);
OS_MSleep(1);
gpio_set_level(disp_pin_rst, 0);
OS_MSleep(100);
gpio_set_level(disp_pin_rst, 1);
OS_MSleep(100);
st7789_enable_backlight(true);
OS_MSleep(100);
// Send all the commands
uint16_t cmd = 0;
while (st7789_init_cmds[cmd].databytes != 0xff) {
printf("Send command 0x%02xn", st7789_init_cmds[cmd].cmd);
st7789_send_cmd(st7789_init_cmds[cmd].cmd);
if ((st7789_init_cmds[cmd].databytes & 0x1F) != 0) {
st7789_send_data(st7789_init_cmds[cmd].data,
st7789_init_cmds[cmd].databytes & 0x1F);
}
if (st7789_init_cmds[cmd].databytes & 0x80) {
OS_MSleep(st7789_init_cmds[cmd].delaytime);
}
cmd++;
}
printf("init finish.n");
st7789_set_orientation(DISPLAY_ORIENTATION);
硬件连接如图所示
为什么RES引脚直接接的VCC,因为不知道是这个芯片的问题还是什么问题。RES引脚接到推挽输出的IO引脚后,屏幕也能点亮,但是亮度莫名其妙很低。手上几个屏都测试了一下,都这样。
然后就是编写一下写命令和写数据的函数,写命令时需要设置一下DC引脚,然后写完立即将DC引脚切换回高电平。
static void st7789_send_cmd(uint8_t cmd) {
gpio_set_level(disp_pin_dc, 0);
dirver_spi_send_data(&cmd, 1);
gpio_set_level(disp_pin_dc, 1);
}
static void st7789_send_data(void *data, uint16_t length) {
dirver_spi_send_data(data, length);
}
然后就是编写屏幕翻转配置函数
static void st7789_set_orientation(uint8_t orientation) {
// ESP_ASSERT(orientation < 4);
const char *orientation_str[] = {"PORTRAIT", "PORTRAIT_INVERTED", "LANDSCAPE",
"LANDSCAPE_INVERTED"};
printf("Display orientation: %sn", orientation_str[orientation]);
uint8_t data[] = {0xC0, 0x00, 0x60, 0xA0};
printf("0x36 command value: 0x%02Xn", data[orientation]);
st7789_send_cmd(ST7789_MADCTL);
st7789_send_data((void *)&data[orientation], 1);
}
最后再写一下写屏函数即可,这里为了快速刷屏,设置了比较大的缓存区。目前还不会使用XR806的DMA,学会了可以减少缓存RAM的大小。
/* The ST7789 display controller can drive 320*240 displays, when using a
* 240*240 display there's a gap of 80px, we need to edit the coordinates to
* take into account that gap, this is not necessary in all orientations. */
void st7789_flush(uint16_t x1, uint16_t x2, uint16_t y1, uint16_t y2,
uint16_t color) {
uint8_t data[4] = {0};
uint16_t offsetx1 = x1;
uint16_t offsetx2 = x2;
uint16_t offsety1 = y1;
uint16_t offsety2 = y2;
#if (TFT_DISPLAY_OFFSETS)
offsetx1 += TFT_DISPLAY_X_OFFSET;
offsetx2 += TFT_DISPLAY_X_OFFSET;
offsety1 += TFT_DISPLAY_Y_OFFSET;
offsety2 += TFT_DISPLAY_Y_OFFSET;
#elif (LV_HOR_RES_MAX == 320) && (LV_VER_RES_MAX == 320)
#if (DISPLAY_ORIENTATION_PORTRAIT)
offsetx1 += 80;
offsetx2 += 80;
#elif (DISPLAY_ORIENTATION_LANDSCAPE_INVERTED)
offsety1 += 80;
offsety2 += 80;
#endif
#endif
/*Column addresses*/
st7789_send_cmd(ST7789_CASET);
data[0] = (offsetx1 > > 8) & 0xFF;
data[1] = offsetx1 & 0xFF;
data[2] = (offsetx2 > > 8) & 0xFF;
data[3] = offsetx2 & 0xFF;
st7789_send_data(data, 4);
/*Page addresses*/
st7789_send_cmd(ST7789_RASET);
data[0] = (offsety1 > > 8) & 0xFF;
data[1] = offsety1 & 0xFF;
data[2] = (offsety2 > > 8) & 0xFF;
data[3] = offsety2 & 0xFF;
st7789_send_data(data, 4);
/*Display On*/
st7789_send_cmd(ST7789_DISPON);
/*Memory write*/
st7789_send_cmd(ST7789_RAMWR);
uint32_t size = (y2 - y1) * (x2 - x1);
uint32_t buffsize = (x2 - x1) * 80;
unsigned char *burst_buffer = (unsigned char *)malloc(buffsize * 2);
for (uint32_t i = 0; i < size + buffsize; i += buffsize) {
for (uint32_t j = 0; j < buffsize; j++) {
burst_buffer[2 * j] = color > > 8;
burst_buffer[2 * j + 1] = color;
}
st7789_send_data(burst_buffer, buffsize * 2);
}
free(burst_buffer);
}
还需要添加一个刷屏函数作为测试,现在补一下。
由于1.69寸屏幕不需要设置屏幕窗口偏移量,就直接按满屏来刷了。
void lcd_clear(uint16_t color) { st7789_flush(0, 240, 0, 320, color); }
然后在main.c里调用屏幕初始化和刷屏函数就可以啦。
#include "common/framework/platform_init.h"
#include "kernel/os/os.h"
#include < stdio.h >
extern void st7789_init();
extern void st7789_flush(uint16_t x1, uint16_t x2, uint16_t y1, uint16_t y2,
uint16_t color);
extern void lcd_clear(uint16_t color);
int main(void) {
platform_init();
printf("gpio demo started.n");
st7789_init();
printf("flush color.n");
// st7789_flush(0, 240, 0, 280, 0xFFFF);
while (1) {
lcd_clear(0x0000);
OS_MSleep(1000);
lcd_clear(0xFFFF);
OS_MSleep(1000);
lcd_clear(0xEF5D);
OS_MSleep(1000);
lcd_clear(0xF800);
OS_MSleep(1000);
lcd_clear(0x07E0);
OS_MSleep(1000);
lcd_clear(0x001F);
OS_MSleep(1000);
}
printf("never run here.n");
return 0;
}
# 清除错误用
void main_cmd_exec(char *cmd) {}
刷屏效果如图
经过测试,手上的1.47寸屏幕和1.69寸st7789屏幕都可以正常驱动。
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