I am currently building a project based on the “STemWin Demonstration” example in the below directory, on the STM32746G Discovery Board. All of the examples use the external DRAM Module (MT48LC4M32B2B5-6A by MICRON). This IC is now obsolete and I would prefer not to use it. Can someone please help me with the below 2 queries?
1) Is the setup such that the use of the external DRAM Module automatic? As in, if you declare an Array (i.e. int Array ) will the FMC automatically use the external DRAM if it needs to? Or can you only read/write to the external DRAM Module using functions HAL_SDRAM_Read() / HAL_SDRAM_Write()?
2) How do I turn off the use of the external DRAM Module as I don’t wish to use this later on my custom PCB? The problem that I am finding is that if you simply comment out the "BSP_SDRAM_Init();" LCD screen fails to load and a black clear is displayed. This is strange as I cannot find any of the following functions used in the project: BSP_SDRAM_ReadData, BSP_SDRAM_ReadData_DMA, BSP_SDRAM_WriteData, BSP_SDRAM_WriteData_DMA, HAL_SDRAM_Write, etc. I cannot see how the STemWin stack interfaces with the external DRAM Module.
Compiler: IAR Workbench v8.11.3
Hardware: STM32746G Discovery Board
Demo Project: C:\...\STM32Cube_FW_F7_V1.8.0\Projects\STM32746G-Discovery\Demonstration\STemWin\EWARM