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

UniGraphic/Inits/ILI9486.cpp

Committer:
hudakz
Date:
2020-05-10
Revision:
0:fa952828e34c

File content as of revision 0:fa952828e34c:

 /* mbed UniGraphic library - Device specific class
 * Copyright (c) 2015 Giuliano Dianda
 * Released under the MIT License: http://mbed.org/license/mit
 */
#include "Protocols.h"
#include "ILI9486.h"

//////////////////////////////////////////////////////////////////////////////////
// display settings ///////////////////////////////////////////////////////
/////////////////////////////////////////////////////////////////////////

// put in constructor
//#define LCDSIZE_X       320 // display X pixels, TFTs are usually portrait view
//#define LCDSIZE_Y       480  // display Y pixels



ILI9486::ILI9486(proto_t displayproto, PortName port, PinName CS, PinName reset, PinName DC, PinName WR, PinName RD, const char *name , unsigned int LCDSIZE_X, unsigned  int LCDSIZE_Y)
    : TFT(displayproto, port, CS, reset, DC, WR, RD, LCDSIZE_X, LCDSIZE_Y, name)
{
    hw_reset();
    BusEnable(true);
    identify(); // will collect tftID and set mipistd flag
    init();
    auto_gram_read_format();// try to get read gram pixel format, could be 16bit or 18bit, RGB or BGR. Will set flags accordingly
    set_orientation(0);
 //   FastWindow(true); // most but not all controllers support this, even if datasheet tells they should. ILI9486 does not, at least in par mode
    cls();
    locate(0,0); 
}
ILI9486::ILI9486(proto_t displayproto, int Hz, PinName mosi, PinName miso, PinName sclk, PinName CS, PinName reset, PinName DC, const char *name, unsigned int LCDSIZE_X, unsigned  int LCDSIZE_Y)
    : TFT(displayproto, Hz, mosi, miso, sclk, CS, reset, DC, LCDSIZE_X, LCDSIZE_Y, name)
{
    hw_reset(); //TFT class forwards to Protocol class
    BusEnable(true); //TFT class forwards to Protocol class
    identify(); // will collect tftID and set mipistd flag
    init(); // per display custom init cmd sequence, implemented here
    auto_gram_read_format();// try to get read gram pixel format, could be 16bit or 18bit, RGB or BGR. Will set flags accordingly
    set_orientation(0); //TFT class does for MIPI standard and some ILIxxx
 //   FastWindow(true); // most but not all controllers support this, even if datasheet tells they should. ILI9486 does not, at least in par mode
    cls();
    locate(0,0); 
}
// reset and init the lcd controller
void ILI9486::init()
{
    /* Start Initial Sequence ----------------------------------------------------*/
    
    wr_cmd8(0xF1);
    wr_data8(0x36);
    wr_data8(0x04);
    wr_data8(0x00);
    wr_data8(0x3C);
    wr_data8(0x0F);
    wr_data8(0x8F);


    wr_cmd8(0xF2);
    wr_data8(0x18);
    wr_data8(0xA3);
    wr_data8(0x12);
    wr_data8(0x02);
    wr_data8(0xb2);
    wr_data8(0x12);
    wr_data8(0xFF);
    wr_data8(0x10);
    wr_data8(0x00);

    wr_cmd8(0xF8);
    wr_data8(0x21);
    wr_data8(0x04);

    wr_cmd8(0xF9);
    wr_data8(0x00);
    wr_data8(0x08);  

    wr_cmd8(0xC0);
    wr_data8(0x0f); //13
    wr_data8(0x0f); //10

    wr_cmd8(0xC1);
    wr_data8(0x42); //43

    wr_cmd8(0xC2);
    wr_data8(0x22);

    wr_cmd8(0xC5);
    wr_data8(0x01); //00
    wr_data8(0x29); //4D
    wr_data8(0x80);

    wr_cmd8(0xB6);
    wr_data8(0x00);
    wr_data8(0x02); //42
    wr_data8(0x3b);

    wr_cmd8(0xB1);
    wr_data8(0xB0); //C0
    wr_data8(0x11);

    wr_cmd8(0xB4);
    wr_data8(0x02); //01

    wr_cmd8(0xE0);
    wr_data8(0x0F);
    wr_data8(0x18);
    wr_data8(0x15);
    wr_data8(0x09);
    wr_data8(0x0B);
    wr_data8(0x04);
    wr_data8(0x49);
    wr_data8(0x64);
    wr_data8(0x3D);
    wr_data8(0x08);
    wr_data8(0x15);
    wr_data8(0x06);
    wr_data8(0x12);
    wr_data8(0x07);
    wr_data8(0x00);

    wr_cmd8(0xE1);
    wr_data8(0x0F);
    wr_data8(0x38);
    wr_data8(0x35);
    wr_data8(0x0a);
    wr_data8(0x0c);
    wr_data8(0x03);
    wr_data8(0x4A);
    wr_data8(0x42);
    wr_data8(0x36);
    wr_data8(0x04);
    wr_data8(0x0F);
    wr_data8(0x03);
    wr_data8(0x1F);
    wr_data8(0x1B);
    wr_data8(0x00);

    wr_cmd8(0x20);                     // display inversion OFF
  
    wr_cmd8(0x36);      // MEMORY_ACCESS_CONTROL (orientation stuff)
    wr_data8(0x48);
     
    wr_cmd8(0x3A);      // COLMOD_PIXEL_FORMAT_SET
    wr_data8(0x55);     // 16 bit pixel 

    wr_cmd8(0x13); // Nomal Displaymode
    
    wr_cmd8(0x11);                     // sleep out
    wait_ms(150);
     
    wr_cmd8(0x29);                     // display on
    wait_ms(150);
}