We're going to use uGFX, so all the init commands are token from the uGFX library without of changes (they are called indirectly by calling gfxInit() ).
The help I need is that someone gives me a working code that outputs something to LCD so that I'll understand where I was wrong.
I'm not asking for uGFX codes. Any code that will work with ILI9488 would be applicable.
I'm always to walk step-by-step in resolving problems, so here's the LCD datasheet:
https://www.buydisplay.com/download/man ... asheet.pdf
here's my wiring:
Pin name ESP32 pin LCD pin
MOSI 23 27
MISO 25 28
SCK 19 24
CS 22 23
DC 21 25
RST 18 21
BCKL 5 29
+5V +5V 2
GND GND 1
and here's my code:
this file lays in uGFX library
Code: Select all
gdisp_lld_ILI9488.c
/*
* This file is subject to the terms of the GFX License. If a copy of
* the license was not distributed with this file, you can obtain one at:
*
* http://ugfx.org/license.html
*/
#include "gfx.h"
#if GFX_USE_GDISP
#if defined(GDISP_SCREEN_HEIGHT) || defined(GDISP_SCREEN_HEIGHT)
#if GFX_COMPILER_WARNING_TYPE == GFX_COMPILER_WARNING_DIRECT
#warning "GDISP: This low level driver does not support setting a screen size. It is being ignored."
#elif GFX_COMPILER_WARNING_TYPE == GFX_COMPILER_WARNING_MACRO
COMPILER_WARNING("GDISP: This low level driver does not support setting a screen size. It is being ignored.")
#endif
#undef GDISP_SCREEN_WIDTH
#undef GDISP_SCREEN_HEIGHT
#endif
#define GDISP_DRIVER_VMT GDISPVMT_ILI9488
#include "gdisp_lld_config.h"
#include "../lib/ugfx/src/gdisp/gdisp_driver.h"
#include "board_ILI9488.h"
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
#ifndef GDISP_SCREEN_HEIGHT
#define GDISP_SCREEN_HEIGHT 480
#endif
#ifndef GDISP_SCREEN_WIDTH
#define GDISP_SCREEN_WIDTH 320
#endif
#ifndef GDISP_INITIAL_CONTRAST
#define GDISP_INITIAL_CONTRAST 50
#endif
#ifndef GDISP_INITIAL_BACKLIGHT
#define GDISP_INITIAL_BACKLIGHT 100
#endif
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
static void dummy_read(GDisplay* g) {
volatile uint16_t dummy;
dummy = read_data(g);
(void)dummy;
}
static void set_viewport(GDisplay* g) {
write_index(g, 0x2A);
write_data(g, ((g->p.x >> 8) & 0x00FF));
write_data(g, ((g->p.x >> 0) & 0x00FF));
write_data(g, ((g->p.x + g->p.cx - 1) >> 8) & 0x00FF);
write_data(g, ((g->p.x + g->p.cx - 1) >> 0) & 0x00FF);
write_index(g, 0x2B);
write_data(g, ((g->p.y >> 8) & 0x00FF));
write_data(g, ((g->p.y >> 0) & 0x00FF));
write_data(g, ((g->p.y + g->p.cy - 1) >> 8) & 0x00FF);
write_data(g, ((g->p.y + g->p.cy - 1) >> 0) & 0x00FF);
write_index(g, 0x2C);
}
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
LLDSPEC gBool gdisp_lld_init(GDisplay *g) {
// No private area for this controller
g->priv = 0;
// Initialise the board interface
init_board(g);
/* Hardware reset */
setpin_reset(g, gTrue);
gfxSleepMilliseconds(2);
setpin_reset(g, gFalse);
gfxSleepMilliseconds(10);
setpin_reset(g, gTrue);
gfxSleepMilliseconds(120);
/* Get the bus for the following initialisation commands */
acquire_bus(g);
write_index(g, 0xF7);
write_data(g, 0xA9);
write_data(g, 0x51);
write_data(g, 0x2C);
write_data(g, 0x82);
write_index(g, 0xC0);
write_data(g, 0x11);
write_data(g, 0x09);
write_index(g, 0xC1);
write_data(g, 0x41);
write_index(g, 0xC5);
write_data(g, 0x00);
write_data(g, 0x2A);
write_data(g, 0x80);
write_index(g, 0xB1);
write_data(g, 0xB0);
write_data(g, 0x11);
write_index(g, 0xB4);
write_data(g, 0x02);
write_index(g, 0xB6);
write_data(g, 0x02);
write_data(g, 0x22);
write_data(g, 0x3B);
write_index(g, 0xB7);
write_data(g, 0xC6);
write_index(g, 0xBE);
write_data(g, 0x00);
write_data(g, 0x04);
write_index(g, 0xE9);
write_data(g, 0x00);
write_index(g, 0x36);
write_data(g, 0x08);
write_index(g, 0x3A);
write_data(g, 0x55);
write_index(g, 0xE0);
write_data(g, 0x00);
write_data(g, 0x07);
write_data(g, 0x12);
write_data(g, 0x0B);
write_data(g, 0x18);
write_data(g, 0x0B);
write_data(g, 0x3F);
write_data(g, 0x9B);
write_data(g, 0x4B);
write_data(g, 0x0B);
write_data(g, 0x0F);
write_data(g, 0x0B);
write_data(g, 0x15);
write_data(g, 0x17);
write_data(g, 0x0F);
write_index(g, 0xE1);
write_data(g, 0x00);
write_data(g, 0x16);
write_data(g, 0x1B);
write_data(g, 0x02);
write_data(g, 0x0F);
write_data(g, 0x06);
write_data(g, 0x34);
write_data(g, 0x46);
write_data(g, 0x48);
write_data(g, 0x04);
write_data(g, 0x0D);
write_data(g, 0x0D);
write_data(g, 0x35);
write_data(g, 0x36);
write_data(g, 0x0F);
write_index(g, 0x11);
gfxSleepMilliseconds(120);
write_index(g, 0x29);
// Finish Init
post_init_board(g);
// Release the bus
release_bus(g);
// Turn on the back-light
set_backlight(g, GDISP_INITIAL_BACKLIGHT);
// Initialise the GDISP structure
g->g.Width = GDISP_SCREEN_WIDTH;
g->g.Height = GDISP_SCREEN_HEIGHT;
g->g.Orientation = gOrientation0;
g->g.Powermode = gPowerOn;
g->g.Backlight = GDISP_INITIAL_BACKLIGHT;
g->g.Contrast = GDISP_INITIAL_CONTRAST;
return gTrue;
}
#if GDISP_HARDWARE_STREAM_WRITE
LLDSPEC void gdisp_lld_write_start(GDisplay *g) {
acquire_bus(g);
set_viewport(g);
}
LLDSPEC void gdisp_lld_write_color(GDisplay *g) {
write_data(g, gdispColor2Native(g->p.color));
}
LLDSPEC void gdisp_lld_write_stop(GDisplay *g) {
release_bus(g);
}
#endif
#if GDISP_HARDWARE_STREAM_READ
LLDSPEC void gdisp_lld_read_start(GDisplay *g) {
acquire_bus(g);
set_viewport(g);
setreadmode(g);
dummy_read(g);
}
LLDSPEC gColor gdisp_lld_read_color(GDisplay *g) {
uint16_t data;
data = read_data(g);
return gdispNative2Color(data);
}
LLDSPEC void gdisp_lld_read_stop(GDisplay *g) {
setwritemode(g);
release_bus(g);
}
#endif
#if GDISP_NEED_CONTROL && GDISP_HARDWARE_CONTROL
LLDSPEC void gdisp_lld_control(GDisplay *g) {
switch(g->p.x) {
case GDISP_CONTROL_POWER:
if (g->g.Powermode == (gPowermode)g->p.ptr)
return;
switch((gPowermode)g->p.ptr) {
case gPowerOff:
acquire_bus(g);
write_index(g, 0x28);
gfxSleepMilliseconds(10);
write_index(g, 0x10);
release_bus(g);
break;
case gPowerOn:
acquire_bus(g);
write_index(g, 0x11);
gfxSleepMilliseconds(120);
write_index(g, 0x29);
release_bus(g);
if (g->g.Powermode != gPowerSleep)
gdisp_lld_init(g);
break;
case gPowerSleep:
acquire_bus(g);
write_index(g, 0x28);
gfxSleepMilliseconds(10);
write_index(g, 0x10);
release_bus(g);
break;
default:
return;
}
g->g.Powermode = (gPowermode)g->p.ptr;
return;
case GDISP_CONTROL_ORIENTATION:
if (g->g.Orientation == (gOrientation)g->p.ptr)
return;
switch((gOrientation)g->p.ptr) {
case gOrientation0:
acquire_bus(g);
write_index(g, 0x36);
write_data(g, 0x08);
release_bus(g);
g->g.Height = GDISP_SCREEN_HEIGHT;
g->g.Width = GDISP_SCREEN_WIDTH;
break;
case gOrientation90:
acquire_bus(g);
write_index(g, 0x36);
write_data(g, 0x68);
release_bus(g);
g->g.Height = GDISP_SCREEN_WIDTH;
g->g.Width = GDISP_SCREEN_HEIGHT;
break;
case gOrientation180:
acquire_bus(g);
write_index(g, 0x36);
write_data(g, 0xC8);
release_bus(g);
g->g.Height = GDISP_SCREEN_HEIGHT;
g->g.Width = GDISP_SCREEN_WIDTH;
break;
case gOrientation270:
acquire_bus(g);
write_index(g, 0x36);
write_data(g, 0xA8);
release_bus(g);
g->g.Height = GDISP_SCREEN_WIDTH;
g->g.Width = GDISP_SCREEN_HEIGHT;
break;
default:
return;
}
g->g.Orientation = (gOrientation)g->p.ptr;
return;
default:
return;
}
}
#endif
#endif /* GFX_USE_GDISP */
Code: Select all
/*
* This file is subject to the terms of the GFX License. If a copy of
* the license was not distributed with this file, you can obtain one at:
*
* http://ugfx.org/license.html
*/
#ifndef _GDISP_LLD_BOARD_H
#define _GDISP_LLD_BOARD_H
/*
*
* This code has been compiled mostly from the spi_master_example that is included
* in the espressif idf under examples/peripherals/spi_master.
*
* None of the code has been compiled/tested in this file so expect bugs!
*
*/
//#include <stdlib.h>
//#include <string.h>
#include "driver/spi_master.h"
#include "soc/gpio_struct.h"
#include "driver/gpio.h"
#include <string.h>
#define LCD_MOSI 23
#define LCD_MISO 25
#define LCD_SCK 19
#define LCD_CS 22
#define LCD_DC 21
#define LCD_RST 18
#define LCD_BCKL 5
//To speed up transfers, every SPI transfer sends a bunch of lines. This define specifies how many. More means more memory use,
//but less overhead for setting up / finishing transfers. Make sure 240 is dividable by this.
#define PARALLEL_LINES 16
static spi_device_handle_t spi;
//This function is called (in irq context!) just before a transmission starts. It will
//set the D/C line to the value indicated in the user field.
void lcd_spi_pre_transfer_callback(spi_transaction_t *t)
{
int dc=(int)t->user;
gpio_set_level(LCD_DC, dc);
}
static GFXINLINE void init_board(GDisplay *g) {
(void) g;
spi_bus_config_t buscfg={
.miso_io_num=LCD_MISO,
.mosi_io_num=LCD_MOSI,
.sclk_io_num=LCD_SCK,
.quadwp_io_num=-1,
.quadhd_io_num=-1,
.max_transfer_sz=PARALLEL_LINES*320*2+8
};
spi_device_interface_config_t devcfg={
// .clock_speed_hz=26*1000*1000, //Clock out at 26 MHz
.clock_speed_hz=10*1000*1000,
.mode=0, //SPI mode 0
.spics_io_num=LCD_CS, //CS pin
.queue_size=7, //We want to be able to queue 7 transactions at a time
.pre_cb=lcd_spi_pre_transfer_callback, //Specify pre-transfer callback to handle D/C line
};
//Initialize the SPI bus
spi_bus_initialize(HSPI_HOST, &buscfg, 1);
//Attach the LCD to the SPI bus
spi_bus_add_device(HSPI_HOST, &devcfg, &spi);
//Initialize non-SPI GPIOs
gpio_set_direction(LCD_DC, GPIO_MODE_OUTPUT);
gpio_set_direction(LCD_RST, GPIO_MODE_OUTPUT);
gpio_set_direction(LCD_BCKL, GPIO_MODE_OUTPUT);
}
static GFXINLINE void post_init_board(GDisplay *g) {
(void) g;
}
static GFXINLINE void setpin_reset(GDisplay *g, gBool state) {
(void) g;
if (state) {
gpio_set_level(LCD_RST, 0);
} else {
gpio_set_level(LCD_RST, 1);
}
}
static GFXINLINE void set_backlight(GDisplay *g, uint8_t percent) {
(void) g;
if (percent > 0) {
gpio_set_level(LCD_BCKL, 1);
} else {
gpio_set_level(LCD_BCKL, 0);
}
}
static GFXINLINE void acquire_bus(GDisplay *g) {
(void) g;
gpio_set_level(LCD_CS, 0);
}
static GFXINLINE void release_bus(GDisplay *g) {
(void) g;
gpio_set_level(LCD_CS, 1);
}
static GFXINLINE void write_index(GDisplay *g, uint16_t index) {
(void) g;
esp_err_t ret;
spi_transaction_t t;
memset(&t, 0, sizeof(t)); //Zero out the transaction
t.length=16; //Command is 8 bits
t.length=8; //Command is 8 bits
t.tx_buffer=&index; //The data is the cmd itself
t.user=(void*)0; //D/C needs to be set to 0
ret=spi_device_transmit(spi, &t); //Transmit!
assert(ret==ESP_OK); //Should have had no issues.
}
static GFXINLINE void write_data(GDisplay *g, uint16_t data) {
(void) g;
esp_err_t ret;
spi_transaction_t t;
memset(&t, 0, sizeof(t)); //Zero out the transaction
t.length=16; //Command is 8 bits
t.length=8; //Command is 8 bits
t.tx_buffer=&data; //The data is the cmd itself
t.user=(void*)1; //D/C needs to be set to 0
ret=spi_device_transmit(spi, &t); //Transmit!
assert(ret==ESP_OK); //Should have had no issues.
}
static GFXINLINE void setreadmode(GDisplay *g) {
(void) g;
}
static GFXINLINE void setwritemode(GDisplay *g) {
(void) g;
}
static GFXINLINE uint16_t read_data(GDisplay *g) {
(void) g;
return 0;
}
#endif /* _GDISP_LLD_BOARD_H */
However I've tried to draw smth on screen using uGFX calls, there's no result.
Again, I need some codes that will output SPI commands to LCD so that I'll have some point to start the integration.
Thanks.