3.5" inch TFT LCD Display Module 480X320 driven with FSMC.

TFT LCD Display Module 480X320 driven with FSMC

I have recently bought a 3.5" inch TFT LCD Touch Screen Display Module 480X320 with a www.mcufriend.com label on the back side. The display was equipped with an 8bit parallel interface. First I decided to test it with the UniGraphic library using the BUS_8 protocol. The display was very slow but improved when I switched to the PAR_8 protocol. Because I heard about the possibility to use a Flexible Static Memory Controller (FSMC), built into some STM MCU's, to drive LCD's (read/write to LCD's memory rather than to an external SRAM) I thought it would be a fun to try it out.

https://os.mbed.com/media/uploads/hudakz/lcd_3.5_tft_480x320_mcufriend_front.png

Below is the brief story of what I did:

  • Selected FSMC in the Connectivity category and configured it as below: https://os.mbed.com/media/uploads/hudakz/arch_max_fsmc_conf.png
  • Let the STM32CubeIDE generate the code (files).
  • Created a new program for the Seeed Arch Max target in the Mbed Online Compiler by selecting a mbed os blinky template.
  • Replaced the main.cpp with the main.c content of the STM32CubeIDE project.
  • Copy & Pasted the other files with codes from the STM32CubeIDE project to the online compiler project.
  • Renamed and modified:
    "stm32f4xx_it.h" to "stm32f4xx_it_msp.h"
    "stm32f4xx_it.c" to "stm32f4xx_it_msp.c"
  • Added the UniGraphic library to the online compiler project.
  • Extended the UniGraphic library with a FSMC_8 protocol and replaced the TFT::set_orientation(int orient) function with the one used by mcufriend for arduino.
  • Modified the main.cpp as needed.
https://os.mbed.com/media/uploads/hudakz/stm32f407vet6_st-link03.pnghttps://os.mbed.com/media/uploads/hudakz/lcd_3.5_tft_480x320_mcufriend_back.png


Wiring

STM32F407VETFT LCD module
+3.3V3V3
GNDGND
PB_12LCD_RST
GNDLCD_CS
PD_13 (RS)LCD_RS
PD_5 (WR)LCD_WR
PD_4 (RD)LCD_RD
PD_14 (DB00)LCD_D0
PD_15 (DB01)LCD_D1
PD_0 (DB02)LCD_D2
PD_1 (DB03)LCD_D3
PE_7 (DB04)LCD_D4
PE_8 (DB05)LCD_D5
PE_9 (DB06)LCD_D6
PE_10 (DB07)LCD_D7



Results
Execution times
Used protocolBUS_8FSMC_8
Operation \ Timemsms
Clear2283.98038.454
Plot192.06611.365
8bit BMP63.80541.338
Large Font163.8727.895
Sparce pixels2072.265/1458.05174.107/52.168
16bit BMP2288.58959.904
Committer:
hudakz
Date:
Sun May 10 10:44:31 2020 +0000
Revision:
0:fa952828e34c
Child:
1:47c996032a9e
3.5" inch TFT LCD Display Module 480X320 driven with FSMC.

Who changed what in which revision?

UserRevisionLine numberNew contents of line
hudakz 0:fa952828e34c 1 /* mbed TextDisplay Library Base Class
hudakz 0:fa952828e34c 2 * Copyright (c) 2007-2009 sford
hudakz 0:fa952828e34c 3 * Released under the MIT License: http://mbed.org/license/mit
hudakz 0:fa952828e34c 4 *
hudakz 0:fa952828e34c 5 * A common base class for Text displays
hudakz 0:fa952828e34c 6 * To port a new display, derive from this class and implement
hudakz 0:fa952828e34c 7 * the constructor (setup the display), character (put a character
hudakz 0:fa952828e34c 8 * at a location), rows and columns (number of rows/cols) functions.
hudakz 0:fa952828e34c 9 * Everything else (locate, printf, putc, cls) will come for free
hudakz 0:fa952828e34c 10 *
hudakz 0:fa952828e34c 11 * The model is the display will wrap at the right and bottom, so you can
hudakz 0:fa952828e34c 12 * keep writing and will always get valid characters. The location is
hudakz 0:fa952828e34c 13 * maintained internally to the class to make this easy
hudakz 0:fa952828e34c 14 */
hudakz 0:fa952828e34c 15
hudakz 0:fa952828e34c 16 #ifndef MBED_TEXTDISPLAY_H
hudakz 0:fa952828e34c 17 #define MBED_TEXTDISPLAY_H
hudakz 0:fa952828e34c 18
hudakz 0:fa952828e34c 19 #include "mbed.h"
hudakz 0:fa952828e34c 20
hudakz 0:fa952828e34c 21 /** A common base class for Text displays
hudakz 0:fa952828e34c 22 */
hudakz 0:fa952828e34c 23 class TextDisplay : public Stream {
hudakz 0:fa952828e34c 24 public:
hudakz 0:fa952828e34c 25
hudakz 0:fa952828e34c 26 // functions needing implementation in derived implementation class
hudakz 0:fa952828e34c 27 // ----------------------------------------------------------------
hudakz 0:fa952828e34c 28 /** Create a TextDisplay interface
hudakz 0:fa952828e34c 29 * @param name The name used in the path to access the strean through the filesystem
hudakz 0:fa952828e34c 30 */
hudakz 0:fa952828e34c 31 TextDisplay(const char *name = NULL);
hudakz 0:fa952828e34c 32
hudakz 0:fa952828e34c 33 /** output a character at the given position
hudakz 0:fa952828e34c 34 *
hudakz 0:fa952828e34c 35 * @param column column where charater must be written
hudakz 0:fa952828e34c 36 * @param row where character must be written
hudakz 0:fa952828e34c 37 * @param c the character to be written to the TextDisplay
hudakz 0:fa952828e34c 38 * @note this method may be overridden in a derived class.
hudakz 0:fa952828e34c 39 */
hudakz 0:fa952828e34c 40 virtual void character(int column, int row, int c) = 0;
hudakz 0:fa952828e34c 41
hudakz 0:fa952828e34c 42 /** return number of rows on TextDisplay
hudakz 0:fa952828e34c 43 * @result number of rows
hudakz 0:fa952828e34c 44 * @note this method must be supported in the derived class.
hudakz 0:fa952828e34c 45 */
hudakz 0:fa952828e34c 46 virtual int rows() = 0;
hudakz 0:fa952828e34c 47
hudakz 0:fa952828e34c 48 /** return number of columns on TextDisplay
hudakz 0:fa952828e34c 49 * @result number of columns
hudakz 0:fa952828e34c 50 * @note this method must be supported in the derived class.
hudakz 0:fa952828e34c 51 */
hudakz 0:fa952828e34c 52 virtual int columns() = 0;
hudakz 0:fa952828e34c 53
hudakz 0:fa952828e34c 54 // functions that come for free, but can be overwritten
hudakz 0:fa952828e34c 55 // ----------------------------------------------------
hudakz 0:fa952828e34c 56 /** redirect output from a stream (stoud, sterr) to display
hudakz 0:fa952828e34c 57 * @param stream stream that shall be redirected to the TextDisplay
hudakz 0:fa952828e34c 58 * @note this method may be overridden in a derived class.
hudakz 0:fa952828e34c 59 * @returns true if the claim succeeded.
hudakz 0:fa952828e34c 60 */
hudakz 0:fa952828e34c 61 virtual bool claim (FILE *stream);
hudakz 0:fa952828e34c 62
hudakz 0:fa952828e34c 63 /** clear the entire screen
hudakz 0:fa952828e34c 64 * @note this method may be overridden in a derived class.
hudakz 0:fa952828e34c 65 */
hudakz 0:fa952828e34c 66 virtual void cls();
hudakz 0:fa952828e34c 67
hudakz 0:fa952828e34c 68 /** locate the cursor at a character position.
hudakz 0:fa952828e34c 69 * Based on the currently active font, locate the cursor on screen.
hudakz 0:fa952828e34c 70 * @note this method may be overridden in a derived class.
hudakz 0:fa952828e34c 71 * @param column is the horizontal offset from the left side.
hudakz 0:fa952828e34c 72 * @param row is the vertical offset from the top.
hudakz 0:fa952828e34c 73 */
hudakz 0:fa952828e34c 74 virtual void locate(int column, int row);
hudakz 0:fa952828e34c 75
hudakz 0:fa952828e34c 76 /** set the foreground color
hudakz 0:fa952828e34c 77 * @note this method may be overridden in a derived class.
hudakz 0:fa952828e34c 78 * @param color is color to use for foreground drawing.
hudakz 0:fa952828e34c 79 */
hudakz 0:fa952828e34c 80 virtual void foreground(uint16_t colour);
hudakz 0:fa952828e34c 81
hudakz 0:fa952828e34c 82 /** set the background color
hudakz 0:fa952828e34c 83 * @note this method may be overridden in a derived class.
hudakz 0:fa952828e34c 84 * @param color is color to use for background drawing.
hudakz 0:fa952828e34c 85 */
hudakz 0:fa952828e34c 86 virtual void background(uint16_t colour);
hudakz 0:fa952828e34c 87
hudakz 0:fa952828e34c 88 // putc (from Stream)
hudakz 0:fa952828e34c 89 // printf (from Stream)
hudakz 0:fa952828e34c 90
hudakz 0:fa952828e34c 91 protected:
hudakz 0:fa952828e34c 92
hudakz 0:fa952828e34c 93 virtual int _putc(int value);
hudakz 0:fa952828e34c 94 virtual int _getc();
hudakz 0:fa952828e34c 95
hudakz 0:fa952828e34c 96 // character location
hudakz 0:fa952828e34c 97 int _column;
hudakz 0:fa952828e34c 98 int _row;
hudakz 0:fa952828e34c 99
hudakz 0:fa952828e34c 100 // colours
hudakz 0:fa952828e34c 101 volatile uint16_t _foreground;
hudakz 0:fa952828e34c 102 volatile uint16_t _background;
hudakz 0:fa952828e34c 103 char *_path;
hudakz 0:fa952828e34c 104 };
hudakz 0:fa952828e34c 105
hudakz 0:fa952828e34c 106 #endif