How to use the LCD touchscreen

The LCD touchscreen used by the MCBSTM32F400 evaluation board is a resistive film giving a resolution of 4000 × 4000 (that is, far greater than the GLCD). This recipe extends touchScreenDemo_c2v0 and illustrates how to use the LCD touchscreen.

How to do it…

Perform the following steps to use the LCD touchscreen:

1. Return to touchScreenDemo_c2v0 and open the project.

2. Use the RTE manager to add Software Component → Board Support for the Graphic LCD (in addition to the Touchscreen). Click Resolve and then OK.

3. Open touchScreenDemo.c, and include the following headers:

   #include <stdio.h>
   #include "stm32f4xx_hal.h"
   #include "cmsis_os.h"
   #include "Driver_I2C.h"
   #include "Board_GLCD.h"
   #include "GLCD_Config.h"
   #include "Board_Touch.h"

4. Define the following macros, global variables, and function prototypes:

   // The size of the touch-screen co-ordinates system.
   #define SCREEN_TS_WIDTH  4000
   #define SCREEN_TS_HEIGHT 4000
   
   #define wait_delay HAL_Delay
   
   /* Globals */
   extern GLCD_FONT...