Zoltan Hudak / Mbed OS LCD_McuFriend_FSMC_STM32F407

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/SEPS225.h@0:fa952828e34c, 2020-05-10 (annotated)

Committer:
hudakz
Date:
Sun May 10 10:44:31 2020 +0000
Revision:
0:fa952828e34c
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 #ifndef SEPS225_H
hudakz 0:fa952828e34c 2 #define SEPS225_H included
hudakz 0:fa952828e34c 3
hudakz 0:fa952828e34c 4 #include "mbed.h"
hudakz 0:fa952828e34c 5 #include "TFT.h"
hudakz 0:fa952828e34c 6 //#include "vt100.h"
hudakz 0:fa952828e34c 7 //extern vt100 *tty ;
hudakz 0:fa952828e34c 8
hudakz 0:fa952828e34c 9 /** Class for SEPS225 Syncoam Co.,Ltd
hudakz 0:fa952828e34c 10 * 128 x 128 Dots, 262K Colors PM-OLED Display Driver and Controller
hudakz 0:fa952828e34c 11 */
hudakz 0:fa952828e34c 12
hudakz 0:fa952828e34c 13 class SEPS225 : public TFT
hudakz 0:fa952828e34c 14 {
hudakz 0:fa952828e34c 15
hudakz 0:fa952828e34c 16 public:
hudakz 0:fa952828e34c 17
hudakz 0:fa952828e34c 18 /** Create a PAR display interface
hudakz 0:fa952828e34c 19 * @param displayproto PAR_8 or PAR_16
hudakz 0:fa952828e34c 20 * @param port GPIO port name to use
hudakz 0:fa952828e34c 21 * @param CS pin connected to CS of display
hudakz 0:fa952828e34c 22 * @param reset pin connected to RESET of display
hudakz 0:fa952828e34c 23 * @param DC pin connected to data/command of display
hudakz 0:fa952828e34c 24 * @param WR pin connected to SDI of display
hudakz 0:fa952828e34c 25 * @param RD pin connected to RS of display
hudakz 0:fa952828e34c 26 * @param name The name used by the parent class to access the interface
hudakz 0:fa952828e34c 27 * @param LCDSIZE_X x size in pixel - optional
hudakz 0:fa952828e34c 28 * @param LCDSIZE_Y y size in pixel - optional
hudakz 0:fa952828e34c 29 */
hudakz 0:fa952828e34c 30 SEPS225(proto_t displayproto, PortName port, PinName CS, PinName reset, PinName DC, PinName WR, PinName RD, const char* name ,const unsigned int LCDSIZE_X = 128, unsigned int LCDSIZE_Y = 128);
hudakz 0:fa952828e34c 31
hudakz 0:fa952828e34c 32 /** Create a BUS display interface
hudakz 0:fa952828e34c 33 * @param displayproto BUS_8 or BUS_16
hudakz 0:fa952828e34c 34 * @param buspins array of PinName to group as Bus
hudakz 0:fa952828e34c 35 * @param CS pin connected to CS of display
hudakz 0:fa952828e34c 36 * @param reset pin connected to RESET of display
hudakz 0:fa952828e34c 37 * @param DC pin connected to data/command of display
hudakz 0:fa952828e34c 38 * @param WR pin connected to SDI of display
hudakz 0:fa952828e34c 39 * @param RD pin connected to RS of display
hudakz 0:fa952828e34c 40 * @param name The name used by the parent class to access the interface
hudakz 0:fa952828e34c 41 * @param LCDSIZE_X x size in pixel - optional
hudakz 0:fa952828e34c 42 * @param LCDSIZE_Y y size in pixel - optional
hudakz 0:fa952828e34c 43 */
hudakz 0:fa952828e34c 44 SEPS225(proto_t displayproto, PinName* buspins, PinName CS, PinName reset, PinName DC, PinName WR, PinName RD, const char* name ,const unsigned int LCDSIZE_X = 128, unsigned int LCDSIZE_Y = 128);
hudakz 0:fa952828e34c 45
hudakz 0:fa952828e34c 46 /** Create an SPI display interface
hudakz 0:fa952828e34c 47 * @param displayproto SPI_8 or SPI_16
hudakz 0:fa952828e34c 48 * @param Hz SPI speed in Hz
hudakz 0:fa952828e34c 49 * @param mosi SPI pin
hudakz 0:fa952828e34c 50 * @param miso SPI pin
hudakz 0:fa952828e34c 51 * @param sclk SPI pin
hudakz 0:fa952828e34c 52 * @param CS pin connected to CS of display
hudakz 0:fa952828e34c 53 * @param reset pin connected to RESET of display
hudakz 0:fa952828e34c 54 * @param DC pin connected to data/command of display
hudakz 0:fa952828e34c 55 * @param name The name used by the parent class to access the interface
hudakz 0:fa952828e34c 56 * @param LCDSIZE_X x size in pixel - optional
hudakz 0:fa952828e34c 57 * @param LCDSIZE_Y y size in pixel - optional
hudakz 0:fa952828e34c 58 */
hudakz 0:fa952828e34c 59 SEPS225(proto_t displayproto, int Hz, PinName mosi, PinName miso, PinName sclk, PinName CS, PinName reset, PinName DC, const char* name ,unsigned int LCDSIZE_X = 128, unsigned int LCDSIZE_Y = 128);
hudakz 0:fa952828e34c 60
hudakz 0:fa952828e34c 61
hudakz 0:fa952828e34c 62 virtual void pixel(int x, int y, unsigned short color);
hudakz 0:fa952828e34c 63 virtual void window(int x, int y, int w, int h);
hudakz 0:fa952828e34c 64 virtual void rect(int x0, int y0, int x1, int y1, unsigned short color) ;
hudakz 0:fa952828e34c 65 virtual void cls(void) ; // virtual
hudakz 0:fa952828e34c 66 virtual unsigned short pixelread(int x, int y);
hudakz 0:fa952828e34c 67 virtual void window4read(int x, int y, int w, int h);
hudakz 0:fa952828e34c 68 virtual void window_pushpixel(unsigned short color);
hudakz 0:fa952828e34c 69 virtual void window_pushpixel(unsigned short color, unsigned int count);
hudakz 0:fa952828e34c 70 virtual void window_pushpixelbuf(unsigned short* color, unsigned int lenght);
hudakz 0:fa952828e34c 71 void display(int onoff) ;
hudakz 0:fa952828e34c 72
hudakz 0:fa952828e34c 73 void reg_write(unsigned char cmd, unsigned char data) ;
hudakz 0:fa952828e34c 74 void cmd_write(unsigned char cmd) ;
hudakz 0:fa952828e34c 75 void data_write(unsigned char data) ;
hudakz 0:fa952828e34c 76 void write8(unsigned char data) ;
hudakz 0:fa952828e34c 77 void write16(unsigned short sdata) ;
hudakz 0:fa952828e34c 78 void bufwrite8(unsigned char *data, unsigned long len) ;
hudakz 0:fa952828e34c 79 void bufwrite16(unsigned short *sdata, unsigned long len) ;
hudakz 0:fa952828e34c 80
hudakz 0:fa952828e34c 81 protected:
hudakz 0:fa952828e34c 82
hudakz 0:fa952828e34c 83
hudakz 0:fa952828e34c 84 /** Init command sequence
hudakz 0:fa952828e34c 85 */
hudakz 0:fa952828e34c 86 void init();
hudakz 0:fa952828e34c 87
hudakz 0:fa952828e34c 88
hudakz 0:fa952828e34c 89 private:
hudakz 0:fa952828e34c 90 DigitalOut *_cs ;
hudakz 0:fa952828e34c 91 DigitalOut *_rs ;
hudakz 0:fa952828e34c 92 } ;
hudakz 0:fa952828e34c 93
hudakz 0:fa952828e34c 94 #endif /* SEPS225_H */
hudakz 0:fa952828e34c 95