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/TFT_MIPI.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 "TFT_MIPI.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 TFT_MIPI::TFT_MIPI ( 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, 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 // scrollbugfix=1; // when scrolling 1 line, the last line disappears, set to 1 to fix it, for ili9481 is set automatically in identify() set_orientation(0); // FastWindow(true); // most but not all controllers support this, even if datasheet tells they should. Give a try cls(); locate(0, 0); } /** * @brief * @note * @param * @retval */ TFT_MIPI::TFT_MIPI ( proto_t displayproto, PinName* buspins, PinName CS, PinName reset, PinName DC, PinName WR, PinName RD, const char* name, unsigned int LCDSIZE_X, unsigned int LCDSIZE_Y ) : TFT(displayproto, buspins, 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(); set_orientation(0); cls(); locate(0, 0); } /** * @brief * @note * @param * @retval */ TFT_MIPI::TFT_MIPI ( 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 // scrollbugfix=1; // when scrolling 1 line, the last line disappears, set to 1 to fix it, for ili9481 is set automatically in identify() 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. Give a try cls(); locate(0, 0); } /** * @brief * @note * @param * @retval */ TFT_MIPI::TFT_MIPI ( proto_t displayproto, PinName reset, const char* name, unsigned int LCDSIZE_X, unsigned int LCDSIZE_Y ) : TFT(displayproto, reset, LCDSIZE_X, LCDSIZE_Y, name) { hw_reset(); identify(); // will collect tftID and set mipistd flag init(); auto_gram_read_format(); set_orientation(0); cls(); locate(0, 0); } // reset and init the lcd controller void TFT_MIPI::init() { /* Start Initial Sequence ----------------------------------------------------*/ /* Start Initial Sequence ----------------------------------------------------*/ wr_cmd8(0xD0); // POWER SETTING wr_data8(0x07); wr_data8(0x42); wr_data8(0x18); wr_cmd8(0xD1); // VCOM control wr_data8(0x00); wr_data8(0x07); wr_data8(0x10); wr_cmd8(0xD2); // Power_Setting for Normal Mode wr_data8(0x01); // LCD power supply current wr_data8(0x02); // charge pumps wr_cmd8(0xC0); // Panel Driving Setting wr_data8(0x10); // 10 orig wr_data8(0x3B); //number of lines+1 *8 wr_data8(0x00); wr_data8(0x02); wr_data8(0x11); // C1 missing? Display_Timing_Setting for Normal Mode //renesas does not have this // wr_cmd8(0xC5); // Frame Rate and Inversion Control // wr_data8(0x03); // 72hz, datashet tells default 02=85hz wr_cmd8(0xC8); // Gamma settings wr_data8(0x00); wr_data8(0x32); wr_data8(0x36); wr_data8(0x45); wr_data8(0x06); wr_data8(0x16); wr_data8(0x37); wr_data8(0x75); wr_data8(0x77); wr_data8(0x54); wr_data8(0x0C); wr_data8(0x00); wr_cmd8(0x36); // MEMORY_ACCESS_CONTROL (orientation stuff) wr_data8(0x0A); // 0A as per chinese example (vertical flipped) wr_cmd8(0x3A); // COLMOD_PIXEL_FORMAT_SET, not present in AN 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); }