lvgl_esp32_drivers/lvgl_tft/st7789.c

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/**
* @file st7789.c
*
* Mostly taken from lbthomsen/esp-idf-littlevgl github.
*/
#include "st7789.h"
#include "disp_spi.h"
#include "display_port.h"
/*********************
* DEFINES
*********************/
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/**********************
* TYPEDEFS
**********************/
/*The LCD needs a bunch of command/argument values to be initialized. They are stored in this struct. */
typedef struct {
uint8_t cmd;
uint8_t data[16];
uint8_t databytes; //No of data in data; bit 7 = delay after set; 0xFF = end of cmds.
} lcd_init_cmd_t;
/**********************
* STATIC PROTOTYPES
**********************/
static void st7789_set_orientation(lv_disp_drv_t *drv, uint8_t orientation);
static void st7789_send_cmd(lv_disp_drv_t * drv, uint8_t cmd);
static void st7789_send_data(lv_disp_drv_t * drv, void *data, uint16_t length);
static void st7789_send_color(lv_disp_drv_t * drv, void *data, uint16_t length);
static void st7789_reset(lv_disp_drv_t * drv);
static void setup_initial_offsets(lv_disp_drv_t * drv);
static lv_coord_t get_display_hor_res(lv_disp_drv_t * drv);
static lv_coord_t get_display_ver_res(lv_disp_drv_t * drv);
/**********************
* STATIC VARIABLES
**********************/
static uint16_t user_x_offset = 0u;
static uint16_t user_y_offset = 0u;
/**********************
* MACROS
**********************/
/**********************
* GLOBAL FUNCTIONS
**********************/
void st7789_init(lv_disp_drv_t *drv)
{
setup_initial_offsets(drv);
lcd_init_cmd_t st7789_init_cmds[] = {
{0xCF, {0x00, 0x83, 0X30}, 3},
{0xED, {0x64, 0x03, 0X12, 0X81}, 4},
{ST7789_PWCTRL2, {0x85, 0x01, 0x79}, 3},
{0xCB, {0x39, 0x2C, 0x00, 0x34, 0x02}, 5},
{0xF7, {0x20}, 1},
{0xEA, {0x00, 0x00}, 2},
{ST7789_LCMCTRL, {0x26}, 1},
{ST7789_IDSET, {0x11}, 1},
{ST7789_VCMOFSET, {0x35, 0x3E}, 2},
{ST7789_CABCCTRL, {0xBE}, 1},
{ST7789_MADCTL, {0x00}, 1}, // Set to 0x28 if your display is flipped
{ST7789_COLMOD, {0x55}, 1},
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#if ST7789_INVERT_COLORS == 1
{ST7789_INVON, {0}, 0}, // set inverted mode
#else
{ST7789_INVOFF, {0}, 0}, // set non-inverted mode
#endif
{ST7789_RGBCTRL, {0x00, 0x1B}, 2},
{0xF2, {0x08}, 1},
{ST7789_GAMSET, {0x01}, 1},
{ST7789_PVGAMCTRL, {0xD0, 0x00, 0x02, 0x07, 0x0A, 0x28, 0x32, 0x44, 0x42, 0x06, 0x0E, 0x12, 0x14, 0x17}, 14},
{ST7789_NVGAMCTRL, {0xD0, 0x00, 0x02, 0x07, 0x0A, 0x28, 0x31, 0x54, 0x47, 0x0E, 0x1C, 0x17, 0x1B, 0x1E}, 14},
{ST7789_CASET, {0x00, 0x00, 0x00, 0xEF}, 4},
{ST7789_RASET, {0x00, 0x00, 0x01, 0x3f}, 4},
{ST7789_RAMWR, {0}, 0},
{ST7789_GCTRL, {0x07}, 1},
{0xB6, {0x0A, 0x82, 0x27, 0x00}, 4},
{ST7789_SLPOUT, {0}, 0x80},
{ST7789_DISPON, {0}, 0x80},
{0, {0}, 0xff},
};
st7789_reset(drv);
//Send all the commands
uint16_t cmd = 0;
while (st7789_init_cmds[cmd].databytes!=0xff) {
st7789_send_cmd(drv, st7789_init_cmds[cmd].cmd);
st7789_send_data(drv, st7789_init_cmds[cmd].data, st7789_init_cmds[cmd].databytes&0x1F);
if (st7789_init_cmds[cmd].databytes & 0x80) {
display_port_delay(drv, 100);
}
cmd++;
}
/* NOTE: Setting rotation from lv_disp_drv_t instead of menuconfig */
lv_disp_rot_t rotation;
#if (LVGL_VERSION_MAJOR >= 8)
rotation = lv_disp_get_rotation((lv_disp_t *) &drv);
#else
rotation = lv_disp_get_rotation((lv_disp_t *) drv);
#endif
st7789_set_orientation(drv, rotation);
}
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/* The ST7789 display controller can drive up to 320*240 displays, when using a 240*240 or 240*135
* displays there's a gap of 80px or 40/52/53px respectively. 52px or 53x offset depends on display orientation.
* We need to edit the coordinates to take into account those gaps, this is not necessary in all orientations. */
void st7789_flush(lv_disp_drv_t * drv, const lv_area_t * area, lv_color_t * color_map)
{
uint8_t data[4] = {0};
uint16_t offsetx1 = area->x1;
uint16_t offsetx2 = area->x2;
uint16_t offsety1 = area->y1;
uint16_t offsety2 = area->y2;
uint32_t size = lv_area_get_width(area) * lv_area_get_height(area);
/* On LVGLv7 we have to manually update the driver orientation,
* in LVGLv8 we use the driver update callback. */
#if (LVGL_VERSION_MAJOR < 8)
static lv_disp_rot_t cached_rotation = LV_DISP_ROT_NONE;
lv_disp_rot_t rotation = lv_disp_get_rotation((lv_disp_t *) drv);
if (cached_rotation != rotation) {
st7789_set_orientation(drv, (uint8_t) rotation);
/* Update offset values */
setup_initial_offsets(drv);
cached_rotation = rotation;
}
#endif
offsetx1 += st7789_x_offset();
offsetx2 += st7789_x_offset();
offsety1 += st7789_y_offset();
offsety2 += st7789_y_offset();
/*Column addresses*/
st7789_send_cmd(drv, ST7789_CASET);
data[0] = (offsetx1 >> 8) & 0xFF;
data[1] = offsetx1 & 0xFF;
data[2] = (offsetx2 >> 8) & 0xFF;
data[3] = offsetx2 & 0xFF;
st7789_send_data(drv, data, 4);
/*Page addresses*/
st7789_send_cmd(drv, ST7789_RASET);
data[0] = (offsety1 >> 8) & 0xFF;
data[1] = offsety1 & 0xFF;
data[2] = (offsety2 >> 8) & 0xFF;
data[3] = offsety2 & 0xFF;
st7789_send_data(drv, data, 4);
/*Memory write*/
st7789_send_cmd(drv, ST7789_RAMWR);
st7789_send_color(drv, (void*) color_map, size * 2);
}
void st7789_set_x_offset(const uint16_t offset)
{
user_x_offset = offset;
}
void st7789_set_y_offset(const uint16_t offset)
{
user_y_offset = offset;
}
uint16_t st7789_x_offset(void)
{
return user_x_offset;
}
uint16_t st7789_y_offset(void)
{
return user_y_offset;
}
/**********************
* STATIC FUNCTIONS
**********************/
static void st7789_send_cmd(lv_disp_drv_t *drv, uint8_t cmd)
{
disp_wait_for_pending_transactions();
display_port_gpio_dc(drv, 0);
disp_spi_send_data(&cmd, 1);
}
static void st7789_send_data(lv_disp_drv_t *drv, void * data, uint16_t length)
{
disp_wait_for_pending_transactions();
display_port_gpio_dc(drv, 1);
disp_spi_send_data(data, length);
}
static void st7789_send_color(lv_disp_drv_t *drv, void * data, uint16_t length)
{
disp_wait_for_pending_transactions();
display_port_gpio_dc(drv, 1);
disp_spi_send_colors(data, length);
}
/* Reset the display, if we don't have a reset pin we use software reset */
static void st7789_reset(lv_disp_drv_t *drv)
{
#if !defined(ST7789_SOFT_RST)
display_port_gpio_rst(drv, 0);
display_port_delay(drv, 100);
display_port_gpio_rst(drv, 1);
display_port_delay(drv, 100);
#else
st7789_send_cmd(drv, ST7789_SWRESET);
display_port_delay(drv, 5);
#endif
}
static void st7789_set_orientation(lv_disp_drv_t *drv, uint8_t orientation)
{
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uint8_t data[] =
{
#if CONFIG_LV_PREDEFINED_DISPLAY_TTGO
0x60, 0xA0, 0x00, 0xC0
#else
0xC0, 0x60, 0x00, 0xA0
#endif
};
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st7789_send_cmd(drv, ST7789_MADCTL);
st7789_send_data(drv, (void *) &data[orientation], 1);
}
static void setup_initial_offsets(lv_disp_drv_t * drv)
{
lv_disp_rot_t rotation;
#if (LVGL_VERSION_MAJOR >= 8)
rotation = lv_disp_get_rotation((lv_disp_t *) &drv);
#else
rotation = lv_disp_get_rotation((lv_disp_t *) drv);
#endif
#if (CONFIG_LV_TFT_DISPLAY_OFFSETS)
st7789_set_x_offset(CONFIG_LV_TFT_DISPLAY_X_OFFSET);
st7789_set_y_offset(CONFIG_LV_TFT_DISPLAY_Y_OFFSET);
#else
if (240U == get_display_hor_res(drv) && 135U == get_display_ver_res(drv))
{
if (LV_DISP_ROT_NONE == rotation || LV_DISP_ROT_180 == rotation)
{
st7789_set_x_offset(40);
st7789_set_y_offset(53);
}
else
{
st7789_set_x_offset(0);
st7789_set_y_offset(0);
}
}
else if (135U == get_display_hor_res(drv) && 240U == get_display_ver_res(drv))
{
if (LV_DISP_ROT_90 == rotation || LV_DISP_ROT_270 == rotation)
{
st7789_set_x_offset(52);
st7789_set_y_offset(40);
}
else
{
st7789_set_x_offset(0);
st7789_set_y_offset(0);
}
}
else if (240U == get_display_hor_res(drv) && 240U == get_display_ver_res(drv))
{
if (LV_DISP_ROT_NONE == rotation)
{
st7789_set_x_offset(80);
st7789_set_y_offset(0);
}
else if (LV_DISP_ROT_90 == rotation || LV_DISP_ROT_180 == rotation)
{
st7789_set_x_offset(0);
st7789_set_y_offset(0);
}
else if (LV_DISP_ROT_270 == rotation)
{
st7789_set_x_offset(0);
st7789_set_y_offset(80);
}
}
#endif
}
/* Display update callback, we could update the orientation in here
* NOTE Available only for LVGL v8 */
void st7789_update_cb(lv_disp_drv_t *drv)
{
lv_disp_rot_t rotation;
#if (LVGL_VERSION_MAJOR >= 8)
rotation = lv_disp_get_rotation((lv_disp_t *) &drv);
#else
rotation = lv_disp_get_rotation((lv_disp_t *) drv);
#endif
st7789_set_orientation(drv, (uint8_t) rotation);
setup_initial_offsets(drv);
}
static lv_coord_t get_display_hor_res(lv_disp_drv_t * drv)
{
lv_coord_t retval = 0;
#if (LVGL_VERSION_MAJOR >= 8)
retval = drv->hor_res;
#else
(void) drv;
retval = LV_HOR_RES_MAX;
#endif
return retval;
}
static lv_coord_t get_display_ver_res(lv_disp_drv_t * drv)
{
lv_coord_t retval = 0;
#if (LVGL_VERSION_MAJOR >= 8)
retval = drv->ver_res;
#else
(void) drv;
retval = LV_VER_RES_MAX;
#endif
return retval;
}