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/Protocols/BUS16.cpp@1:47c996032a9e, 2020-09-25 (annotated)

Committer:
hudakz
Date:
Fri Sep 25 14:52:27 2020 +0000
Revision:
1:47c996032a9e
Parent:
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 /* mbed UniGraphic library - BUS16 protocol class
hudakz 0:fa952828e34c 2 * Copyright (c) 2015 Giuliano Dianda
hudakz 0:fa952828e34c 3 * Released under the MIT License: http://mbed.org/license/mit
hudakz 0:fa952828e34c 4 *
hudakz 0:fa952828e34c 5 * Derived work of:
hudakz 0:fa952828e34c 6 *
hudakz 0:fa952828e34c 7 * mbed library for 240*320 pixel display TFT based on ILI9341 LCD Controller
hudakz 0:fa952828e34c 8 * Copyright (c) 2013 Peter Drescher - DC2PD
hudakz 0:fa952828e34c 9 *
hudakz 0:fa952828e34c 10 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
hudakz 0:fa952828e34c 11 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
hudakz 0:fa952828e34c 12 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
hudakz 0:fa952828e34c 13 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
hudakz 0:fa952828e34c 14 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
hudakz 0:fa952828e34c 15 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
hudakz 0:fa952828e34c 16 * THE SOFTWARE.
hudakz 0:fa952828e34c 17 */
hudakz 0:fa952828e34c 18 #include "BUS16.h"
hudakz 0:fa952828e34c 19
hudakz 0:fa952828e34c 20 BUS16::BUS16(PinName* buspins, PinName CS, PinName reset, PinName DC, PinName WR, PinName RD)
hudakz 0:fa952828e34c 21 : _bus(buspins), _CS(CS), _reset(reset), _DC(DC), _WR(WR), _RD(RD)
hudakz 0:fa952828e34c 22 {
hudakz 0:fa952828e34c 23 _reset = 1;
hudakz 0:fa952828e34c 24 _DC=1;
hudakz 0:fa952828e34c 25 _WR=1;
hudakz 0:fa952828e34c 26 _RD=1;
hudakz 0:fa952828e34c 27 _CS=1;
hudakz 0:fa952828e34c 28 _bus.mode(PullNone);
hudakz 0:fa952828e34c 29 _bus.output(); // will re-enable our GPIO port
hudakz 0:fa952828e34c 30 hw_reset();
hudakz 0:fa952828e34c 31 }
hudakz 0:fa952828e34c 32
hudakz 0:fa952828e34c 33 void BUS16::wr_cmd8(unsigned char cmd)
hudakz 0:fa952828e34c 34 {
hudakz 0:fa952828e34c 35 _DC = 0; // 0=cmd
hudakz 0:fa952828e34c 36 _bus.write(cmd); // write 8bit
hudakz 0:fa952828e34c 37 _WR=0;
hudakz 0:fa952828e34c 38 _WR=1;
hudakz 0:fa952828e34c 39 _DC = 1; // 1=data next
hudakz 0:fa952828e34c 40 }
hudakz 0:fa952828e34c 41 void BUS16::wr_data8(unsigned char data)
hudakz 0:fa952828e34c 42 {
hudakz 0:fa952828e34c 43 _bus.write(data); // write 8bit
hudakz 0:fa952828e34c 44 _WR=0;
hudakz 0:fa952828e34c 45 _WR=1;
hudakz 0:fa952828e34c 46 }
hudakz 0:fa952828e34c 47 void BUS16::wr_cmd16(unsigned short cmd)
hudakz 0:fa952828e34c 48 {
hudakz 0:fa952828e34c 49 _DC = 0; // 0=cmd
hudakz 0:fa952828e34c 50 _bus.write(cmd>>8); // write 8bit
hudakz 0:fa952828e34c 51 _WR=0;
hudakz 0:fa952828e34c 52 _WR=1;
hudakz 0:fa952828e34c 53 _bus.write(cmd&0xFF); // write 8bit
hudakz 0:fa952828e34c 54 _WR=0;
hudakz 0:fa952828e34c 55 _WR=1;
hudakz 0:fa952828e34c 56 _DC = 1; // 1=data next
hudakz 0:fa952828e34c 57 }
hudakz 0:fa952828e34c 58 void BUS16::wr_data16(unsigned short data)
hudakz 0:fa952828e34c 59 {
hudakz 0:fa952828e34c 60 _bus.write(data>>8); // write 8bit
hudakz 0:fa952828e34c 61 _WR=0;
hudakz 0:fa952828e34c 62 _WR=1;
hudakz 0:fa952828e34c 63 _bus.write(data&0xFF); // write 8bit
hudakz 0:fa952828e34c 64 _WR=0;
hudakz 0:fa952828e34c 65 _WR=1;
hudakz 0:fa952828e34c 66 }
hudakz 0:fa952828e34c 67 void BUS16::wr_gram(unsigned short data)
hudakz 0:fa952828e34c 68 {
hudakz 0:fa952828e34c 69 _bus.write(data); // write 16bit
hudakz 0:fa952828e34c 70 _WR=0;
hudakz 0:fa952828e34c 71 _WR=1;
hudakz 0:fa952828e34c 72 }
hudakz 0:fa952828e34c 73 void BUS16::wr_gram(unsigned short data, unsigned int count)
hudakz 0:fa952828e34c 74 {
hudakz 0:fa952828e34c 75 while(count)
hudakz 0:fa952828e34c 76 {
hudakz 0:fa952828e34c 77 _bus.write(data); // rewrite even if same data, otherwise too much fast
hudakz 0:fa952828e34c 78 _WR=0;
hudakz 0:fa952828e34c 79 _WR=1;
hudakz 0:fa952828e34c 80 count--;
hudakz 0:fa952828e34c 81 }
hudakz 0:fa952828e34c 82 }
hudakz 0:fa952828e34c 83 void BUS16::wr_grambuf(unsigned short* data, unsigned int lenght)
hudakz 0:fa952828e34c 84 {
hudakz 0:fa952828e34c 85 while(lenght)
hudakz 0:fa952828e34c 86 {
hudakz 0:fa952828e34c 87 _bus.write(*data); // write 16bit
hudakz 0:fa952828e34c 88 _WR=0;
hudakz 0:fa952828e34c 89 _WR=1;
hudakz 0:fa952828e34c 90 data++;
hudakz 0:fa952828e34c 91 lenght--;
hudakz 0:fa952828e34c 92 }
hudakz 0:fa952828e34c 93 }
hudakz 0:fa952828e34c 94 unsigned short BUS16::rd_gram(bool convert)
hudakz 0:fa952828e34c 95 {
hudakz 0:fa952828e34c 96 unsigned int r=0;
hudakz 0:fa952828e34c 97 _bus.input();
hudakz 0:fa952828e34c 98
hudakz 0:fa952828e34c 99 _RD = 0;
hudakz 0:fa952828e34c 100 _bus.read(); //dummy read
hudakz 0:fa952828e34c 101 _RD = 1;
hudakz 0:fa952828e34c 102
hudakz 0:fa952828e34c 103 _RD = 0;
hudakz 0:fa952828e34c 104 // _RD = 0; // add wait
hudakz 0:fa952828e34c 105 r |= _bus.read();
hudakz 0:fa952828e34c 106 _RD = 1;
hudakz 0:fa952828e34c 107 if(convert)
hudakz 0:fa952828e34c 108 {
hudakz 0:fa952828e34c 109 r <<= 8;
hudakz 0:fa952828e34c 110 _RD = 0;
hudakz 0:fa952828e34c 111 // _RD = 0; // add wait
hudakz 0:fa952828e34c 112 r |= _bus.read()>>8; //MSB of port read is blue, LSB is red of next pixel
hudakz 0:fa952828e34c 113 _RD = 1;
hudakz 0:fa952828e34c 114 // gram is 18bit/pixel, if you set 16bit/pixel (cmd 3A), during writing the 16bits are expanded to 18bit
hudakz 0:fa952828e34c 115 // during reading, you read the raw 18bit gram
hudakz 0:fa952828e34c 116 r = RGB24to16((r&0xFF0000)>>16, (r&0xFF00)>>8, r&0xFF);// 18bit pixel padded to 24bits, rrrrrr00_gggggg00_bbbbbb00, converted to 16bit
hudakz 0:fa952828e34c 117 }
hudakz 0:fa952828e34c 118 _bus.output();
hudakz 0:fa952828e34c 119 return (unsigned short)r;
hudakz 0:fa952828e34c 120 }
hudakz 0:fa952828e34c 121 unsigned int BUS16::rd_reg_data32(unsigned char reg)
hudakz 0:fa952828e34c 122 {
hudakz 0:fa952828e34c 123 wr_cmd8(reg);
hudakz 0:fa952828e34c 124 unsigned int r=0;
hudakz 0:fa952828e34c 125 // _DC = 1; // 1=data
hudakz 0:fa952828e34c 126 _bus.input();
hudakz 0:fa952828e34c 127
hudakz 0:fa952828e34c 128 _RD = 0;
hudakz 0:fa952828e34c 129 _bus.read(); //dummy read
hudakz 0:fa952828e34c 130 _RD = 1;
hudakz 0:fa952828e34c 131
hudakz 0:fa952828e34c 132 _RD = 0;
hudakz 0:fa952828e34c 133 // _RD = 0; // add wait
hudakz 0:fa952828e34c 134 r |= (_bus.read()&0xFF);
hudakz 0:fa952828e34c 135 r <<= 8;
hudakz 0:fa952828e34c 136 _RD = 1;
hudakz 0:fa952828e34c 137
hudakz 0:fa952828e34c 138 _RD = 0;
hudakz 0:fa952828e34c 139 // _RD = 0; // add wait
hudakz 0:fa952828e34c 140 r |= (_bus.read()&0xFF);
hudakz 0:fa952828e34c 141 r <<= 8;
hudakz 0:fa952828e34c 142 _RD = 1;
hudakz 0:fa952828e34c 143
hudakz 0:fa952828e34c 144 _RD = 0;
hudakz 0:fa952828e34c 145 // _RD = 0; // add wait
hudakz 0:fa952828e34c 146 r |= (_bus.read()&0xFF);
hudakz 0:fa952828e34c 147 r <<= 8;
hudakz 0:fa952828e34c 148 _RD = 1;
hudakz 0:fa952828e34c 149
hudakz 0:fa952828e34c 150 _RD = 0;
hudakz 0:fa952828e34c 151 // _RD = 0; // add wait
hudakz 0:fa952828e34c 152 r |= (_bus.read()&0xFF);
hudakz 0:fa952828e34c 153 _RD = 1;
hudakz 0:fa952828e34c 154
hudakz 0:fa952828e34c 155 _CS = 1; // toggle CS to interupt the cmd in case was not supported
hudakz 0:fa952828e34c 156 _CS = 0;
hudakz 0:fa952828e34c 157
hudakz 0:fa952828e34c 158 _bus.output();
hudakz 0:fa952828e34c 159 return r;
hudakz 0:fa952828e34c 160 }
hudakz 0:fa952828e34c 161 // in Par mode EXTC regs (0xB0-0xFF) can be directly read
hudakz 0:fa952828e34c 162 unsigned int BUS16::rd_extcreg_data32(unsigned char reg, unsigned char SPIreadenablecmd)
hudakz 0:fa952828e34c 163 {
hudakz 0:fa952828e34c 164 return rd_reg_data32(reg);
hudakz 0:fa952828e34c 165 }
hudakz 0:fa952828e34c 166 // ILI932x specific
hudakz 0:fa952828e34c 167 void BUS16::dummyread()
hudakz 0:fa952828e34c 168 {
hudakz 0:fa952828e34c 169 _bus.input();
hudakz 0:fa952828e34c 170 _RD = 0;
hudakz 0:fa952828e34c 171 _bus.read(); // dummy read
hudakz 0:fa952828e34c 172 _RD=1;
hudakz 0:fa952828e34c 173 // _bus.output();
hudakz 0:fa952828e34c 174 }
hudakz 0:fa952828e34c 175 // ILI932x specific
hudakz 0:fa952828e34c 176 void BUS16::reg_select(unsigned char reg, bool forread)
hudakz 0:fa952828e34c 177 {
hudakz 0:fa952828e34c 178 _DC = 0;
hudakz 0:fa952828e34c 179 _bus.write(reg); // write 16bit
hudakz 0:fa952828e34c 180 _WR=0;
hudakz 0:fa952828e34c 181 _WR=1;
hudakz 0:fa952828e34c 182 _DC = 1; // 1=data next
hudakz 0:fa952828e34c 183 }
hudakz 0:fa952828e34c 184 // ILI932x specific
hudakz 0:fa952828e34c 185 void BUS16::reg_write(unsigned char reg, unsigned short data)
hudakz 0:fa952828e34c 186 {
hudakz 0:fa952828e34c 187 _DC = 0;
hudakz 0:fa952828e34c 188 _bus.write(reg); // write 16bit
hudakz 0:fa952828e34c 189 _WR=0;
hudakz 0:fa952828e34c 190 _WR=1;
hudakz 0:fa952828e34c 191 _DC = 1;
hudakz 0:fa952828e34c 192 _bus.write(data); // write 16bit
hudakz 0:fa952828e34c 193 _WR=0;
hudakz 0:fa952828e34c 194 _WR=1;
hudakz 0:fa952828e34c 195 }
hudakz 0:fa952828e34c 196 // ILI932x specific
hudakz 0:fa952828e34c 197 unsigned short BUS16::reg_read(unsigned char reg)
hudakz 0:fa952828e34c 198 {
hudakz 0:fa952828e34c 199 unsigned short r=0;
hudakz 0:fa952828e34c 200 _DC = 0;
hudakz 0:fa952828e34c 201 _bus.write(reg); // write 16bit
hudakz 0:fa952828e34c 202 _WR=0;
hudakz 0:fa952828e34c 203 _WR=1;
hudakz 0:fa952828e34c 204 _DC = 1;
hudakz 0:fa952828e34c 205 _bus.input();
hudakz 0:fa952828e34c 206 _RD=0;
hudakz 0:fa952828e34c 207 r |= _bus.read(); // read 16bit
hudakz 0:fa952828e34c 208 _RD=1;
hudakz 0:fa952828e34c 209 _bus.output();
hudakz 0:fa952828e34c 210 return r;
hudakz 0:fa952828e34c 211 }
hudakz 0:fa952828e34c 212 void BUS16::hw_reset()
hudakz 0:fa952828e34c 213 {
hudakz 0:fa952828e34c 214 wait_ms(15);
hudakz 0:fa952828e34c 215 _DC = 1;
hudakz 0:fa952828e34c 216 _CS = 1;
hudakz 0:fa952828e34c 217 _WR = 1;
hudakz 0:fa952828e34c 218 _RD = 1;
hudakz 0:fa952828e34c 219 _reset = 0; // display reset
hudakz 0:fa952828e34c 220 wait_ms(2);
hudakz 0:fa952828e34c 221 _reset = 1; // end reset
hudakz 0:fa952828e34c 222 wait_ms(100);
hudakz 0:fa952828e34c 223 }
hudakz 0:fa952828e34c 224 void BUS16::BusEnable(bool enable)
hudakz 0:fa952828e34c 225 {
hudakz 0:fa952828e34c 226 _CS = enable ? 0:1;
hudakz 0:fa952828e34c 227 }