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/I2C_bus.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 - I2C protocol class
hudakz 0:fa952828e34c 2 * Copyright (c) 2017 Peter Drescher
hudakz 0:fa952828e34c 3 * Released under the MIT License: http://mbed.org/license/mit
hudakz 0:fa952828e34c 4 *
hudakz 0:fa952828e34c 5 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
hudakz 0:fa952828e34c 6 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
hudakz 0:fa952828e34c 7 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
hudakz 0:fa952828e34c 8 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
hudakz 0:fa952828e34c 9 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
hudakz 0:fa952828e34c 10 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
hudakz 0:fa952828e34c 11 * THE SOFTWARE.
hudakz 0:fa952828e34c 12 */
hudakz 0:fa952828e34c 13
hudakz 0:fa952828e34c 14 #include "I2C_bus.h"
hudakz 0:fa952828e34c 15
hudakz 0:fa952828e34c 16 I2C_bus::I2C_bus(int Hz, int address, PinName sda, PinName scl)
hudakz 0:fa952828e34c 17 : _i2c(sda,scl)
hudakz 0:fa952828e34c 18 {
hudakz 0:fa952828e34c 19 _i2c.frequency(Hz);
hudakz 0:fa952828e34c 20 _address = address;
hudakz 0:fa952828e34c 21 //hw_reset();
hudakz 0:fa952828e34c 22 }
hudakz 0:fa952828e34c 23
hudakz 0:fa952828e34c 24 void I2C_bus::wr_cmd8(unsigned char cmd)
hudakz 0:fa952828e34c 25 {
hudakz 0:fa952828e34c 26 char tmp[2];
hudakz 0:fa952828e34c 27 tmp[0] = 0x00; //command
hudakz 0:fa952828e34c 28 tmp[1] = cmd;
hudakz 0:fa952828e34c 29 _i2c.write(_address,tmp,2);
hudakz 0:fa952828e34c 30 }
hudakz 0:fa952828e34c 31 void I2C_bus::wr_data8(unsigned char data)
hudakz 0:fa952828e34c 32 {
hudakz 0:fa952828e34c 33 _i2c.write(data); // write 8bit
hudakz 0:fa952828e34c 34 }
hudakz 0:fa952828e34c 35 void I2C_bus::wr_cmd16(unsigned short cmd)
hudakz 0:fa952828e34c 36 {
hudakz 0:fa952828e34c 37 char tmp[3];
hudakz 0:fa952828e34c 38 tmp[0] = 00; //command
hudakz 0:fa952828e34c 39 tmp[1] = cmd>>8;
hudakz 0:fa952828e34c 40 tmp[2] = cmd&0xFF;
hudakz 0:fa952828e34c 41
hudakz 0:fa952828e34c 42 _i2c.write(_address,tmp,3);
hudakz 0:fa952828e34c 43 }
hudakz 0:fa952828e34c 44 void I2C_bus::wr_data16(unsigned short data)
hudakz 0:fa952828e34c 45 {
hudakz 0:fa952828e34c 46 _i2c.write(data>>8); // write 8bit
hudakz 0:fa952828e34c 47 _i2c.write(data&0xFF); // write 8bit
hudakz 0:fa952828e34c 48 }
hudakz 0:fa952828e34c 49 void I2C_bus::wr_gram(unsigned short data)
hudakz 0:fa952828e34c 50 {
hudakz 0:fa952828e34c 51 _i2c.write(data>>8); // write 8bit
hudakz 0:fa952828e34c 52 _i2c.write(data&0xFF); // write 8bit
hudakz 0:fa952828e34c 53 }
hudakz 0:fa952828e34c 54 void I2C_bus::wr_gram(unsigned short data, unsigned int count)
hudakz 0:fa952828e34c 55 {
hudakz 0:fa952828e34c 56 _i2c.start();
hudakz 0:fa952828e34c 57 _i2c.write(_address);
hudakz 0:fa952828e34c 58 _i2c.write(0x40); // data continue
hudakz 0:fa952828e34c 59 if((data>>8)==(data&0xFF))
hudakz 0:fa952828e34c 60 {
hudakz 0:fa952828e34c 61 count<<=1;
hudakz 0:fa952828e34c 62 while(count)
hudakz 0:fa952828e34c 63 {
hudakz 0:fa952828e34c 64 _i2c.write(data); // write 8bit
hudakz 0:fa952828e34c 65 count--;
hudakz 0:fa952828e34c 66 }
hudakz 0:fa952828e34c 67 }
hudakz 0:fa952828e34c 68 else
hudakz 0:fa952828e34c 69 {
hudakz 0:fa952828e34c 70 while(count)
hudakz 0:fa952828e34c 71 {
hudakz 0:fa952828e34c 72 _i2c.write(data>>8); // write 8bit
hudakz 0:fa952828e34c 73 _i2c.write(data&0xFF); // write 8bit
hudakz 0:fa952828e34c 74 count--;
hudakz 0:fa952828e34c 75 }
hudakz 0:fa952828e34c 76 }
hudakz 0:fa952828e34c 77 _i2c.stop();
hudakz 0:fa952828e34c 78 }
hudakz 0:fa952828e34c 79 void I2C_bus::wr_grambuf(unsigned short* data, unsigned int lenght)
hudakz 0:fa952828e34c 80 {
hudakz 0:fa952828e34c 81 _i2c.start();
hudakz 0:fa952828e34c 82 _i2c.write(_address);
hudakz 0:fa952828e34c 83 _i2c.write(0x40); // data continue
hudakz 0:fa952828e34c 84 while(lenght)
hudakz 0:fa952828e34c 85 {
hudakz 0:fa952828e34c 86 _i2c.write((*data)>>8); // write 8bit
hudakz 0:fa952828e34c 87 _i2c.write((*data)&0xFF); // write 8bit
hudakz 0:fa952828e34c 88 data++;
hudakz 0:fa952828e34c 89 lenght--;
hudakz 0:fa952828e34c 90 }
hudakz 0:fa952828e34c 91 _i2c.stop();
hudakz 0:fa952828e34c 92 }
hudakz 0:fa952828e34c 93
hudakz 0:fa952828e34c 94 void I2C_bus::hw_reset()
hudakz 0:fa952828e34c 95 {
hudakz 0:fa952828e34c 96
hudakz 0:fa952828e34c 97 }
hudakz 0:fa952828e34c 98 void I2C_bus::BusEnable(bool enable)
hudakz 0:fa952828e34c 99 {
hudakz 0:fa952828e34c 100 }
hudakz 0:fa952828e34c 101
hudakz 0:fa952828e34c 102 void I2C_bus::reg_select(unsigned char reg, bool forread)
hudakz 0:fa952828e34c 103 {
hudakz 0:fa952828e34c 104 }
hudakz 0:fa952828e34c 105
hudakz 0:fa952828e34c 106 unsigned int I2C_bus::rd_reg_data32(unsigned char reg)
hudakz 0:fa952828e34c 107 {
hudakz 0:fa952828e34c 108 return 0;
hudakz 0:fa952828e34c 109 }
hudakz 0:fa952828e34c 110
hudakz 0:fa952828e34c 111 unsigned int I2C_bus::rd_extcreg_data32(unsigned char reg, unsigned char SPIreadenablecmd)
hudakz 0:fa952828e34c 112 {
hudakz 0:fa952828e34c 113 return 0;
hudakz 0:fa952828e34c 114 }
hudakz 0:fa952828e34c 115
hudakz 0:fa952828e34c 116 void I2C_bus::dummyread()
hudakz 0:fa952828e34c 117 {
hudakz 0:fa952828e34c 118 }
hudakz 0:fa952828e34c 119
hudakz 0:fa952828e34c 120 unsigned short I2C_bus::rd_gram(bool convert)
hudakz 0:fa952828e34c 121 {
hudakz 0:fa952828e34c 122 return (0);
hudakz 0:fa952828e34c 123 }
hudakz 0:fa952828e34c 124
hudakz 0:fa952828e34c 125 unsigned short I2C_bus::reg_read(unsigned char reg)
hudakz 0:fa952828e34c 126 {
hudakz 0:fa952828e34c 127 return (0);
hudakz 0:fa952828e34c 128 }
hudakz 0:fa952828e34c 129
hudakz 0:fa952828e34c 130 void I2C_bus::reg_write(unsigned char reg, unsigned short data)
hudakz 0:fa952828e34c 131 {
hudakz 0:fa952828e34c 132 }