esp-idf/README.md at ac069bfca112b44ac0019743a37acc22fdc85ff9

mirror of https://github.com/espressif/esp-idf.git synced 2024-10-05 20:47:46 -04:00

bizhuangyang ac069bfca1 lcd: simplify lcd example

Move the lcd example files out of the folder spi_master, and refactor
the codes with esp_lcd driver. Add image rotation function to the
example.

2021-07-07 17:14:09 +08:00

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LCD tjpgd example

(See the README.md file in the upper level 'examples' directory for more information about examples.)

Overview

This example shows how to decode a jpeg image and display it on an SPI-interfaced LCD, and rotates the image periodically.

Due to the fact that ESP32S2 and ESP32C3 don't have enough memory to hold the decoded image, the graphic shown on the LCD is calculated randomly and has nothing to do with the picture in the example project.

If you want to adapt this example to another type of display or pinout, check lcd_tjpgd_example_main.c for comments with some implementation details.

How to Use Example

Hardware Required

An ESP development board
An SPI-interfaced LCD
An USB cable for power supply and programming

Hardware Connection

If using default settings, the hardware connection can be as below:

        Board                               LCD Screen
      +--------+              +---------------------------------+
      |        |              |                                 |
      |    3V3 +--------------+ VCC   +----------------------+  |
      |        |              |       |                      |  |
      |    GND +--------------+ GND   |                      |  |
      |        |              |       |                      |  |
      |     23 +--------------+ MOSI  |                      |  |
      |        |              |       |                      |  |
      |     19 +--------------+ SCK   |                      |  |
      |        |              |       |                      |  |
      |     22 +--------------+ CS    |                      |  |
      |        |              |       |                      |  |
      |     21 +--------------+ DC    |                      |  |
      |        |              |       |                      |  |
      |     18 +--------------+ RST   |                      |  |
      |        |              |       |                      |  |
      |      5 +--------------+ BCKL  +----------------------+  |
      |        |              |                                 |
      +--------+              +---------------------------------+

If not using default settings, the interface GPIOs should be set by macros in lcd_tjpgd_example_main.c, where:

PIN_NUM_MOSI stands for the GPIO number connected to 'MOSI' pin at LCD screen;
PIN_NUM_CLK stands for the GPIO number connected to 'SCK' pin at LCD screen;
PIN_NUM_MOSI stands for the GPIO number connected to 'MOSI' pin at LCD screen;
PIN_NUM_CS stands for the GPIO number connected to 'CS' pin at LCD screen;
PIN_NUM_DC stands for the GPIO number connected to 'DC' pin at LCD screen;
PIN_NUM_RST stands for the GPIO number connected to 'RST' pin at LCD screen;
PIN_NUM_BCKL stands for the GPIO number connected to 'LED' pin at LCD screen;

Build and Flash

Run idf.py -p PORT flash monitor to build, flash and monitor the project. A flowing picture will be shown on the LCD screen.

(To exit the serial monitor, type Ctrl-].)

See the Getting Started Guide for full steps to configure and use ESP-IDF to build projects.

Troubleshooting

For any technical queries, please open an [issue] (https://github.com/espressif/esp-idf/issues) on GitHub. We will get back to you soon.

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