LCD_McuFriend_FSMC_STM32F407 - 3.5" inch TFT LCD Display Module 480X320 driven w…

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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.

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 the Connectivity 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 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.

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/Protocols/Protocols.h@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?

User	Revision	Line number	New contents of line
hudakz	0:fa952828e34c	1	/* mbed UniGraphic library - Abstract 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
hudakz	0:fa952828e34c	6	/** @file Protocols.h
hudakz	0:fa952828e34c	7	*/
hudakz	0:fa952828e34c	8	#ifndef Protocols_H
hudakz	0:fa952828e34c	9	#define Protocols_H
hudakz	0:fa952828e34c	10
hudakz	0:fa952828e34c	11	#include "mbed.h"
hudakz	0:fa952828e34c	12
hudakz	0:fa952828e34c	13	#define RGB24to16(r,g,b) (((r&0xF8)<<8)\|((g&0xFC)<<3)\|((b&0xF8)>>3)) //5 red \| 6 green \| 5 blue
hudakz	0:fa952828e34c	14	#define BGR2RGB(color) (((color&0x1F)<<11) \| (color&0x7E0) \| ((color&0xF800)>>11))
hudakz	0:fa952828e34c	15
hudakz	0:fa952828e34c	16	#define FLIP_NONE 0
hudakz	0:fa952828e34c	17	#define FLIP_X 1
hudakz	0:fa952828e34c	18	#define FLIP_Y 2
hudakz	0:fa952828e34c	19
hudakz	0:fa952828e34c	20	//#define USE_CS
hudakz	0:fa952828e34c	21
hudakz	0:fa952828e34c	22	/** Protocol types
hudakz	0:fa952828e34c	23	*/
hudakz	0:fa952828e34c	24	#include "platform.h"
hudakz	0:fa952828e34c	25
hudakz	0:fa952828e34c	26	#if DEVICE_PORTINOUT
hudakz	0:fa952828e34c	27	enum proto_t {
hudakz	0:fa952828e34c	28	PAR_8 /*< Parallel 8bit, port pins 0 to 7 /
hudakz	0:fa952828e34c	29	,PAR_16 /*< Parallel 16bit, port pins 0 to 15 /
hudakz	0:fa952828e34c	30	,BUS_8 /*< Parallel 8bit, scattered pins /
hudakz	0:fa952828e34c	31	,BUS_16 /*< Parallel 16bit, scattered pins /
hudakz	0:fa952828e34c	32	,SPI_8 /*< SPI 8bit /
hudakz	0:fa952828e34c	33	,SPI_16 /*< SPI 16bit /
hudakz	0:fa952828e34c	34	,I2C_ /*< I2C /
hudakz	0:fa952828e34c	35	,FSMC_8 /*< FSMC 8bit /
hudakz	0:fa952828e34c	36	};
hudakz	0:fa952828e34c	37	#else
hudakz	0:fa952828e34c	38	enum proto_t {
hudakz	0:fa952828e34c	39	BUS_8 /*< Parallel 8bit, scattered pins /
hudakz	0:fa952828e34c	40	,BUS_16 /*< Parallel 16bit, scattered pins /
hudakz	0:fa952828e34c	41	,SPI_8 /*< SPI 8bit /
hudakz	0:fa952828e34c	42	,SPI_16 /*< SPI 16bit /
hudakz	0:fa952828e34c	43	,I2C_ /*< I2C /
hudakz	0:fa952828e34c	44	};
hudakz	0:fa952828e34c	45	#endif
hudakz	0:fa952828e34c	46
hudakz	0:fa952828e34c	47
hudakz	0:fa952828e34c	48	/** Abstract interface class for spi and parallel protocols
hudakz	0:fa952828e34c	49	*/
hudakz	0:fa952828e34c	50	class Protocols
hudakz	0:fa952828e34c	51	{
hudakz	0:fa952828e34c	52	public:
hudakz	0:fa952828e34c	53
hudakz	0:fa952828e34c	54	/** Send 8bit command to display controller
hudakz	0:fa952828e34c	55	*
hudakz	0:fa952828e34c	56	* @param cmd: byte to send
hudakz	0:fa952828e34c	57	*
hudakz	0:fa952828e34c	58	*/
hudakz	0:fa952828e34c	59	virtual void wr_cmd8(unsigned char cmd) = 0;
hudakz	0:fa952828e34c	60
hudakz	0:fa952828e34c	61	/** Send 8bit data to display controller
hudakz	0:fa952828e34c	62	*
hudakz	0:fa952828e34c	63	* @param data: byte to send
hudakz	0:fa952828e34c	64	*
hudakz	0:fa952828e34c	65	*/
hudakz	0:fa952828e34c	66	virtual void wr_data8(unsigned char data) = 0;
hudakz	0:fa952828e34c	67
hudakz	0:fa952828e34c	68	/** Send 2x8bit command to display controller
hudakz	0:fa952828e34c	69	*
hudakz	0:fa952828e34c	70	* @param cmd: halfword to send
hudakz	0:fa952828e34c	71	*
hudakz	0:fa952828e34c	72	*/
hudakz	0:fa952828e34c	73	virtual void wr_cmd16(unsigned short cmd) = 0;
hudakz	0:fa952828e34c	74
hudakz	0:fa952828e34c	75	/** Send 2x8bit data to display controller
hudakz	0:fa952828e34c	76	*
hudakz	0:fa952828e34c	77	* @param data: halfword to send
hudakz	0:fa952828e34c	78	*
hudakz	0:fa952828e34c	79	*/
hudakz	0:fa952828e34c	80	virtual void wr_data16(unsigned short data) = 0;
hudakz	0:fa952828e34c	81
hudakz	0:fa952828e34c	82	/** Send 16bit pixeldata to display controller
hudakz	0:fa952828e34c	83	*
hudakz	0:fa952828e34c	84	* @param data: halfword to send
hudakz	0:fa952828e34c	85	*
hudakz	0:fa952828e34c	86	*/
hudakz	0:fa952828e34c	87	virtual void wr_gram(unsigned short data) = 0;
hudakz	0:fa952828e34c	88
hudakz	0:fa952828e34c	89	/** Send same 16bit pixeldata to display controller multiple times
hudakz	0:fa952828e34c	90	*
hudakz	0:fa952828e34c	91	* @param data: halfword to send
hudakz	0:fa952828e34c	92	* @param count: how many
hudakz	0:fa952828e34c	93	*
hudakz	0:fa952828e34c	94	*/
hudakz	0:fa952828e34c	95	virtual void wr_gram(unsigned short data, unsigned int count) = 0;
hudakz	0:fa952828e34c	96
hudakz	0:fa952828e34c	97	/** Send array of pixeldata shorts to display controller
hudakz	0:fa952828e34c	98	*
hudakz	0:fa952828e34c	99	* @param data: unsigned short pixeldata array
hudakz	0:fa952828e34c	100	* @param lenght: lenght (in shorts)
hudakz	0:fa952828e34c	101	*
hudakz	0:fa952828e34c	102	*/
hudakz	0:fa952828e34c	103	virtual void wr_grambuf(unsigned short* data, unsigned int lenght) = 0;
hudakz	0:fa952828e34c	104
hudakz	0:fa952828e34c	105	/** Read 16bit pixeldata from display controller (with dummy cycle)
hudakz	0:fa952828e34c	106	*
hudakz	0:fa952828e34c	107	* @param convert true/false. Convert 18bit to 16bit, some controllers returns 18bit
hudakz	0:fa952828e34c	108	* @returns 16bit color
hudakz	0:fa952828e34c	109	*/
hudakz	0:fa952828e34c	110	virtual unsigned short rd_gram(bool convert) = 0;
hudakz	0:fa952828e34c	111
hudakz	0:fa952828e34c	112	/** Read 4x8bit register data (with dummy cycle)
hudakz	0:fa952828e34c	113	* @param reg the register to read
hudakz	0:fa952828e34c	114	* @returns data as uint
hudakz	0:fa952828e34c	115	*
hudakz	0:fa952828e34c	116	*/
hudakz	0:fa952828e34c	117	virtual unsigned int rd_reg_data32(unsigned char reg) = 0;
hudakz	0:fa952828e34c	118
hudakz	0:fa952828e34c	119	/** Read 3x8bit ExtendedCommands register data
hudakz	0:fa952828e34c	120	* @param reg the register to read
hudakz	0:fa952828e34c	121	* @param SPIreadenablecmd vendor/device specific cmd to read EXTC registers
hudakz	0:fa952828e34c	122	* @returns data as uint
hudakz	0:fa952828e34c	123	* @note EXTC regs (0xB0 to 0xFF) are read/write registers but needs special cmd to be read in SPI mode
hudakz	0:fa952828e34c	124	*/
hudakz	0:fa952828e34c	125	virtual unsigned int rd_extcreg_data32(unsigned char reg, unsigned char SPIreadenablecmd) = 0;
hudakz	0:fa952828e34c	126
hudakz	0:fa952828e34c	127	/** ILI932x specific, does a dummy read cycle, number of bits is protocol dependent
hudakz	0:fa952828e34c	128	* for PAR protocols: a signle RD bit toggle
hudakz	0:fa952828e34c	129	* for SPI8: 8clocks
hudakz	0:fa952828e34c	130	* for SPI16: 16 clocks
hudakz	0:fa952828e34c	131	*/
hudakz	0:fa952828e34c	132	virtual void dummyread () = 0;
hudakz	0:fa952828e34c	133
hudakz	0:fa952828e34c	134	/** ILI932x specific, select register for a successive write or read
hudakz	0:fa952828e34c	135	*
hudakz	0:fa952828e34c	136	* @param reg register to be selected
hudakz	0:fa952828e34c	137	* @param forread false = a write next (default), true = a read next
hudakz	0:fa952828e34c	138	* @note forread only used by SPI protocols
hudakz	0:fa952828e34c	139	*/
hudakz	0:fa952828e34c	140	virtual void reg_select(unsigned char reg, bool forread =false) = 0;
hudakz	0:fa952828e34c	141
hudakz	0:fa952828e34c	142	/** ILI932x specific, write register with data
hudakz	0:fa952828e34c	143	*
hudakz	0:fa952828e34c	144	* @param reg register to write
hudakz	0:fa952828e34c	145	* @param data 16bit data
hudakz	0:fa952828e34c	146	*/
hudakz	0:fa952828e34c	147	virtual void reg_write(unsigned char reg, unsigned short data) = 0;
hudakz	0:fa952828e34c	148
hudakz	0:fa952828e34c	149	/** ILI932x specific, read register
hudakz	0:fa952828e34c	150	*
hudakz	0:fa952828e34c	151	* @param reg register to be read
hudakz	0:fa952828e34c	152	* @returns 16bit register value
hudakz	0:fa952828e34c	153	*/
hudakz	0:fa952828e34c	154	virtual unsigned short reg_read(unsigned char reg) = 0;
hudakz	0:fa952828e34c	155
hudakz	0:fa952828e34c	156	/** HW reset sequence (without display init commands)
hudakz	0:fa952828e34c	157	*/
hudakz	0:fa952828e34c	158	virtual void hw_reset() = 0;
hudakz	0:fa952828e34c	159
hudakz	0:fa952828e34c	160	/** Set ChipSelect high or low
hudakz	0:fa952828e34c	161	* @param enable 0/1
hudakz	0:fa952828e34c	162	*/
hudakz	0:fa952828e34c	163	virtual void BusEnable(bool enable) = 0;
hudakz	0:fa952828e34c	164
hudakz	0:fa952828e34c	165	};
hudakz	0:fa952828e34c	166	#endif

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Type:	Program
Mbed OS support:	Mbed OS
Created:	10 May 2020
Imports:	38
Forks:	0
Commits:	2
Dependents:	0
Dependencies:	0
Followers:	3