STM32F4 + TFT LCD driver with 8bit parallel interface

[Silas Valera]

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

[Imen.D]

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

[Silas Valera]

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 */

}

[Imen.D]

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

[Silas Valera]

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-DataLCD_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);}

[Silas Valera]

Posted on May 02, 2017 at 03:15

This set up did not work for me. 

Can anyone help me on this?  Really appreciate..:)

Thanks

Silas