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.
Below is the brief story of what I did:
- Created a project for my STM32F407VE board in the STM32CubeIDE
- Set the
Clock Configuration
to match the one used by Mbed for the Seeed Arch Max board:
- Selected
FSMC
in theConnectivity
category and configured it as below: - 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 themain.c
content of theSTM32CubeIDE
project. Copy & Pasted
the other files with codes from theSTM32CubeIDE
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 aFSMC_8
protocol and replaced theTFT::set_orientation(int orient)
function with the one used bymcufriend
for arduino. - Modified the
main.cpp
as needed.
Wiring
STM32F407VE | TFT LCD module |
---|---|
+3.3V | 3V3 |
GND | GND |
PB_12 | LCD_RST |
GND | LCD_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 protocol | BUS_8 | FSMC_8 |
Operation \ Time | ms | ms |
Clear | 2283.980 | 38.454 |
Plot | 192.066 | 11.365 |
8bit BMP | 63.805 | 41.338 |
Large Font | 163.872 | 7.895 |
Sparce pixels | 2072.265/1458.051 | 74.107/52.168 |
16bit BMP | 2288.589 | 59.904 |
UniGraphic/Inits/SSD1306.h
- Committer:
- hudakz
- Date:
- 2020-09-25
- Revision:
- 1:47c996032a9e
- Parent:
- 0:fa952828e34c
File content as of revision 1:47c996032a9e:
#ifndef MBED_SSD1306_H #define MBED_SSD1306_H #include "mbed.h" #include "LCD.h" /** Class for SSD1306 display controller * to be copypasted and adapted for other controllers */ class SSD1306 : public LCD { public: /** Create a PAR display interface * @param displayproto only supports PAR_8 * @param port GPIO port name to use * @param CS pin connected to CS of display * @param reset pin connected to RESET of display * @param DC pin connected to data/command of display * @param WR pin connected to SDI of display * @param RD pin connected to RS of display * @param name The name used by the parent class to access the interface * @param LCDSIZE_X x size in pixel - optional * @param LCDSIZE_Y y size in pixel - optional */ SSD1306(proto_t displayproto, PortName port, PinName CS, PinName reset, PinName DC, PinName WR, PinName RD, const char* name, unsigned int LCDSIZE_X = 128, unsigned int LCDSIZE_Y = 64); /** Create an SPI display interface * @param displayproto SPI_8 or SPI_16 * @param Hz SPI speed in Hz * @param mosi SPI pin * @param miso SPI pin * @param sclk SPI pin * @param CS pin connected to CS of display * @param reset pin connected to RESET of display * @param DC pin connected to data/command of display * @param name The name used by the parent class to access the interface * @param LCDSIZE_X x size in pixel - optional * @param LCDSIZE_Y y size in pixel - optional */ SSD1306(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 = 64); /** Create an I2C display interface * @param displayproto I2C_ * @param Hz I2C speed in Hz * @param address I2C address * @param sda I2C pin * @param scl I2C pin * @param name The name used by the parent class to access the interface * @param LCDSIZE_X x size in pixel - optional * @param LCDSIZE_Y y size in pixel - optional */ SSD1306(proto_t displayproto, int Hz, int address, PinName sda, PinName scl, const char* name , unsigned int LCDSIZE_X = 128, unsigned int LCDSIZE_Y = 64); /** set the contrast of the screen * @note here overrided because of not standard value range * @param o contrast 0-255 */ virtual void set_contrast(int o); /** set automatc horizontal scroll mode * @param l_r direction - left = 0, right = 1 * @param s_page start page * @param e_page end page * @param speed time between horizontal shift. 0 slow .. 7 fast */ void horizontal_scroll(int l_r,int s_page,int e_page,int speed); /** automatic horizontal + vertical scroll mode * @param l_r direction - left = 0, right = 1 * @param s_page start page * @param e_page end page * @param v_off vertical offset for scroll * @param speed time between horizontal shift. 0 slow .. 7 fast */ void horiz_vert_scroll(int l_r,int s_page,int e_page,int v_off,int speed); /** end scroll mode * */ void end_scroll(void); protected: /** Init command sequence */ void init(); /** set mirror mode * @note here overriding the LCD class default one because of not standard commands * @param mode NONE, X, Y, XY */ virtual void mirrorXY(mirror_t mode); }; #endif