Senior

Question

STM32F4 + TFT LCD driver with 8bit parallel interface

Forum|Forum|9 years ago
April 17, 2017
2 replies
3788 views

Posted on April 17, 2017 at 03:02

Hi

I am using Nucleo F412ZG (with STM32F412ZGT6) + TFT LCD 320x240 ILI9341 with 8bit parallel interface over FSMC - IDE is AC6 System Workbench for STM32 along with STemWin 532

I know that GUIDRV_FlexColor does support ILI9341 - I am looking for help on how to use this. Can anyone please help me with sample code? In a simple test set up, I wrote code for LCDWriteReg, LCDWriteData, LCDInit etc.over FSMC and a test function to fill the LCD screen with blue color and it works fine. But I need this to work with GUIDRV_FlexColor and with STemWin so that I can use all graphics and widgets library.

Appreciate your prompt help

Thanks in advance

Silas

This topic has been closed for replies.

I

Imen.D

ST Technical Moderator

Posted on April 17, 2017 at 11:33

Hello Valera.Silas,

I recommend you to run and have a look to the Stemwin example in the STM32CubeF4 at this path, it may be very helpful as a starting point:

STM32Cube_FW_F4_V1.0\Projects\STM32F429IDiscovery\Applications\STemWin
'Getting started with STemwin Library'.
For LTDC use, you have the working example that can help you at this path: STM32Cube_FW_F4_V1.0\Projects\STM324x9I_EVAL\Examples\LTDC
The ili9341 driver is available at this path of STM32CubeF4: STM32Cube_FW_F4_V1.0\Drivers\BSP\Components\ili9341
AN4861: LCD-TFT display controller (LTDC) on STM32 MCUs

You can refer to your reference manual related to your device for more clarification about the LCD-TFT Display Controller (LTDC) section.

Imen

In order to give better visibility on the answered topics, please click on 'Best answer' on the reply which solved your issue or answered your question. Thanks

Silas ValeraAuthor

Senior

Posted on April 19, 2017 at 04:29

Hi Imen,

Thanks for your reply and information.

For my setup, I created LCDConf.c with the required LCD read and write functions along with the following LCD_X_Config function. The LCDInit function also includes code to fill the screen with blue color. Also included the lib - STemWin532_CM4_GCC.a into linker. The code compiles fine without any error. But when I run/debug the LCD screen does not show any color / activity. When I tried to debug (see 'main' code below), single stepping, after the line GUI_Init() - it just hangs, it should go to LCD_X_Config() - but it just hangs

:(

What am I missing? would you please help..

Thanks

Silas V

void LCD_X_Config(void) {

GUI_DEVICE * pDevice;

CONFIG_FLEXCOLOR Config = {0};

GUI_PORT_API PortAPI = {0};

//

// Set display driver and color conversion

//

pDevice = GUI_DEVICE_CreateAndLink(GUIDRV_FLEXCOLOR, GUICC_565, 0, 0);

//

// Display driver configuration, required for Lin-driver

//

LCD_SetSizeEx (0, XSIZE_PHYS , YSIZE_PHYS);

LCD_SetVSizeEx(0, VXSIZE_PHYS, VYSIZE_PHYS);

//

// Orientation

//

Config.Orientation = GUI_SWAP_XY | GUI_MIRROR_Y;

GUIDRV_FlexColor_Config(pDevice, &Config);

//

// Set controller and operation mode

//

PortAPI.pfWrite8_A0 = LcdWriteReg;

PortAPI.pfWrite8_A1 = LcdWriteData;

PortAPI.pfWriteM8_A1 = LcdWriteDataMultiple;

PortAPI.pfReadM8_A1 = LcdReadDataMultiple;

GUIDRV_FlexColor_SetFunc(pDevice, &PortAPI, GUIDRV_FLEXCOLOR_F66709, GUIDRV_FLEXCOLOR_M16C1B8); //for ILI9341, 16bpp + cache + 8bit interface

}

//Main code:

int main(void)

{

/* USER CODE BEGIN 1 */

/* USER CODE END 1 */

/* MCU Configuration----------------------------------------------------------*/

/* Reset of all peripherals, Initializes the Flash interface and the Systick. */

HAL_Init();

/* Configure the system clock */

SystemClock_Config();

/* Initialize all configured peripherals */

MX_GPIO_Init();

MX_FSMC_Init();

MX_TIM6_Init();

MX_RTC_Init();

/* USER CODE BEGIN 2 */

GUI_Init();

HAL_TIM_Base_Start_IT(&htim6);

/* USER CODE END 2 */

/* Infinite loop */

/* USER CODE BEGIN WHILE */

while (1)

{

/* USER CODE END WHILE */

/* USER CODE BEGIN 3 */

}

/* USER CODE END 3 */

}

I

Imen.D

ST Technical Moderator

Posted on April 19, 2017 at 16:47

Hi,

The CRC must be enabled before calling GUI_Init, if not STemWin will be not function.

This is mentioned in the AN4323 to call GUI_Init function prior to use any STemWin function or GUI routines:

The CRC module (in RCC peripheral clock enable register) should be enabled before using the library.

Thanks

Imen

In order to give better visibility on the answered topics, please click on 'Best answer' on the reply which solved your issue or answered your question. Thanks

Silas ValeraAuthor

Senior

Posted on April 21, 2017 at 19:49

Hi Imen,

Thanks again for your reply:) I missed that. I enabled the CRC in the STM32CubeMX for the project and then built the project - and it seems to work - kind of - at least I can see some activity on the LCD screen. But the display shows not full - half the screen is black and half is colored.

Here is my question: for the LCD, when writing to register - the registers addresses are normally 8bit and data is either 8bit or 16bit - like register setting or color values. How does FSMC handle 16bit color values to write over the bus in 8bit mode? Do I need to write high byte and low byte in two code lines? that means the pointer function passed to

PortAPI.pfWrite8_A1 should take 16bit values - but there is no such valid interface for 8bit mode. That is confusing:(

Would you please help ..

Thanks

Silas

I want to confirm my set up - I am trying to use LCD with 8 bit interface over FSMC. The following are the hardware connections:

FSMC Port LCD Connector on Nucleo

FSMC_D4 PA2 D4 12--35

FSMC_D5 PA3 D5 12--37

FSMC_D6 PA4 D6 11--32

FSMC_D7 PA5 D7 12--11

FSMC_NWE PC2 WR/ 11--35

FSMC_NOE PC5 RD/ 12--6

FSMC_D2 PC11 D2 11--2

FSMC_D3 PC12 D3 11--3

FSMC_NE1 PD7 CS/ 11--45

FSMC_D0 PD14 D0 12--46

FSMC_D1 PD15 D1 12--48

FSMC_A16 PD11 RS 12--45 L-Command, H-Data

LCD_RST PB15 RST 12--26

In LCDConf.c I have the following declaration for the LCD data/register writes, LCDread is not implemented since I am using the memory buffer -

♯ define LCD_REG (*(uint8_t *)0x60000000) // A16 low for writing to reg

♯ define LCD_DATA (*(uint8_t *)0x60010000) // A16 high for writring data

void LcdWriteReg(U8 Data) {

// ... TBD by user

LCD_REG = Data;

}

void LcdWriteData(U8 Data) {

// ... TBD by user

LCD_DATA = Data;

}

void LcdWriteDataMultiple(U8 *pData, int NumItems) {

while (NumItems) {

// ... TBD by user

LcdWriteData((uint8_t) *pData) ;

pData++;

NumItems--;

}

void LCD_X_Config(void) {

GUI_DEVICE * pDevice;

CONFIG_FLEXCOLOR Config = {0};

GUI_PORT_API PortAPI = {0};

//

// Set display driver and color conversion

//

pDevice = GUI_DEVICE_CreateAndLink(GUIDRV_FLEXCOLOR, GUICC_565, 0, 0);

//

// Display driver configuration, required for Lin-driver

//

LCD_SetSizeEx (0, XSIZE_PHYS , YSIZE_PHYS);

LCD_SetVSizeEx(0, VXSIZE_PHYS, VYSIZE_PHYS);

//

// Orientation

//

Config.Orientation = 0; //GUI_SWAP_XY | GUI_MIRROR_Y;

GUIDRV_FlexColor_Config(pDevice, &Config);

//

// Set controller and operation mode

//

PortAPI.pfWrite8_A0 = LcdWriteReg;

PortAPI.pfWrite8_A1 = LcdWriteData;

PortAPI.pfWriteM8_A1 = LcdWriteDataMultiple;

PortAPI.pfReadM8_A1 = LcdReadDataMultiple;

GUIDRV_FlexColor_SetFunc(pDevice, &PortAPI, GUIDRV_FLEXCOLOR_F66709, GUIDRV_FLEXCOLOR_M16C1B8);

}

Sign up

Login with SSO

Login to the community

Login with SSO

Scanning file for viruses.

This file cannot be downloaded