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 |
Diff: UniGraphic/Inits/UC1608.cpp
- Revision:
- 0:fa952828e34c
--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/UniGraphic/Inits/UC1608.cpp Sun May 10 10:44:31 2020 +0000 @@ -0,0 +1,100 @@ + /* 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 "UC1608.h" + +////////////////////////////////////////////////////////////////////////////////// +// display settings /////////////////////////////////////////////////////// +///////////////////////////////////////////////////////////////////////// +#define IC_X_SEGS 240 // UC1608 SEG has range 0-239 (239-0 if MX=1), check your datasheet, important for the orientation +#define IC_Y_COMS 128 // UC1608 COM has range 0-127 (127-0 if MY=1), check your datasheet, important for the orientation +//#define LCDSIZE_X 240 // display X pixels +//#define LCDSIZE_Y 120 // display Y pixels, UC1608 is advertised as 240x128 but display size could be smaller + + + +UC1608::UC1608(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) + : LCD(displayproto, port, CS, reset, DC, WR, RD, LCDSIZE_X, LCDSIZE_Y, IC_X_SEGS, IC_Y_COMS, name) +{ + hw_reset(); + BusEnable(true); + init(); + cls(); + set_orientation(1); + locate(0,0); +} +UC1608::UC1608(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) + : LCD(displayproto, Hz, mosi, miso, sclk, CS, reset, DC, LCDSIZE_X, LCDSIZE_Y, IC_X_SEGS, IC_Y_COMS, name) +{ + hw_reset(); + BusEnable(true); + init(); + cls(); + set_orientation(1); + locate(0,0); +} +// reset and init the lcd controller +void UC1608::init() +{ + /* Start Initial Sequence ----------------------------------------------------*/ + + // wr_cmd8(0xE2); // sw reset + wait_ms(15); + + wr_cmd8(0x27); // Multiplex rate :128 set temperature consenpation 0% + wr_cmd8(0xEA); //set bias:1/12bias + + wr_cmd8(0xC4); // set mirror MX=1,MY=0 (controller->display SEGs wiring inverted) + // wr_cmd8(0xA0); // ADC select seg0-seg223 + //wr_cmd8(0xA1); // ADC select seg223-seg0 + // wr_cmd8(0xC8); // SHL select com63-com0 + //wr_cmd8(0xC0); // SHL select com0-com63 + + wr_cmd8(0x2F); // //Power Control:internal, LCD capacitance 60nf-90nf + wait_ms(10); + + // wr_cmd8(0x81);//Set Gain and Potentiometer + // wr_cmd8(0x40|26);//Set Gain and Potentiometer xx xxxxxx + set_contrast(26); + + wr_cmd8(0x88); //disable colum/page address wraparound + wr_cmd8(0xA4); // LCD display ram (EntireDisplayOn disable) + wr_cmd8(0x40); // start line = 0 + wr_cmd8(0xA6); // display normal (1 = illuminated) + wr_cmd8(0xAF); // display ON + +} +//////////////////////////////////////////////////////////////////// +// functions that overrides the standard ones implemented in LCD.cpp +//////////////////////////////////////////////////////////////////// +void UC1608::mirrorXY(mirror_t mode) +{ + switch (mode) + { + case(NONE): + wr_cmd8(0xC4); // this is in real X mirror command, but my display have SEGs wired inverted, so assume this is the default no-x-mirror + break; + case(X): + wr_cmd8(0xC0); + break; + case(Y): + wr_cmd8(0xCC); + break; + case(XY): + wr_cmd8(0xC8); + break; + } +} +void UC1608::set_contrast(int o) +{ + contrast = o; + // wr_cmd8(0x81); // set volume + // wr_cmd8(0x40|(o&0x3F)); + wr_cmd16(0x8140|(o&0x3F)); +} +void UC1608::BusEnable(bool enable) +{ + LCD::BusEnable(!enable); // crap IC has CS not inverted (active HIGH) +} \ No newline at end of file