ESP32S3学习——spi_lcd_ILI9341

芯片：esp32

开发环境：espidfv4.4

一、例程分析

1）readme中并没有很多信息，解码jpg后显示，经过计算显示一个动画效果，分析了spi配置和lcd驱动，解码部分没看明白

2）spi相关头文件：

• \ #include "driver/spi_master.h"

• \ #include "driver/gpio.h"

3）实现效果：一个动图

/* SPI Master example

   This example code is in the Public Domain (or CC0 licensed, at your option.)

   Unless required by applicable law or agreed to in writing, this
   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
   CONDITIONS OF ANY KIND, either express or implied.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "freertos/FreeRTOS.h"
#include "freertos/task.h"
#include "esp_system.h"
#include "driver/spi_master.h"
#include "driver/gpio.h"

#include "pretty_effect.h"

/*
 This code displays some fancy graphics on the 320x240 LCD on an ESP-WROVER_KIT board.
 This example demonstrates the use of both spi_device_transmit as well as
 spi_device_queue_trans/spi_device_get_trans_result and pre-transmit callbacks.

 Some info about the ILI9341/ST7789V: It has an C/D line, which is connected to a GPIO here. It expects this
 line to be low for a command and high for data. We use a pre-transmit callback here to control that
 line: every transaction has as the user-definable argument the needed state of the D/C line and just
 before the transaction is sent, the callback will set this line to the correct state.
*/


#define LCD_HOST    HSPI_HOST

#define PIN_NUM_MISO 25
#define PIN_NUM_MOSI 23
#define PIN_NUM_CLK  19
#define PIN_NUM_CS   22

#define PIN_NUM_DC   21
#define PIN_NUM_RST  18
#define PIN_NUM_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.
//为了加速传输，每个spi传输都发送一些线，这定义了数量，更多意味着更多的内存
//但是用于传输和完成传输的开销跟梢，确保240可以被整除
#define PARALLEL_LINES 16

/*
 The LCD needs a bunch of command/argument values to be initialized. They are stored in this struct.
*/
// 屏幕信息结构体，命令和数据结构体
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;

typedef enum {
    LCD_TYPE_ILI = 1,
    LCD_TYPE_ST,
    LCD_TYPE_MAX,
} type_lcd_t;

//Place data into DRAM. Constant data gets placed into DROM by default, which is not accessible by DMA.
//将数据放到dram，常量数据默认情况会被放到drom，drom不可以使用dma
DRAM_ATTR static const lcd_init_cmd_t st_init_cmds[]={
    /* Memory Data Access Control, MX=MV=1, MY=ML=MH=0, RGB=0 */
    {0x36, {(1<<5)|(1<<6)}, 1},
    /* Interface Pixel Format, 16bits/pixel for RGB/MCU interface */
    {0x3A, {0x55}, 1},
    /* Porch Setting */
    {0xB2, {0x0c, 0x0c, 0x00, 0x33, 0x33}, 5},
    /* Gate Control, Vgh=13.65V, Vgl=-10.43V */
    {0xB7, {0x45}, 1},
    /* VCOM Setting, VCOM=1.175V */
    {0xBB, {0x2B}, 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, {0x11}, 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, 0x00, 0x05, 0x0E, 0x15, 0x0D, 0x