Configuring external SRAM for STM32H743 using CubeMX

[jd2]

Dear ST Community,

I need to use an SRAM with the STM32H743AII6 MCU. When I try to configure the project on CubeMX, a warning appears next to the FMC line. I feel like I should fix this before going further with the configuration.

I am curious why I am getting this warning even when FMC is the only peripheral that was already configured. Has anybody experienced this before? Are there any suggestions to resolve this?

Here is a summary as background information:

• The warning text says "Partly disabled conflict with FMC Chip Select NE1".
• Warning stays even if I use NE 2/3/4.
• The package is UFBGA169, and NE1 pin is available on that specific pinout.
• CubeMX version is 6.11.0 but the issue was present with earlier versions as well.
• A screenshot is attached below.

Thanks,

JD

[SofLit]

Hello,

What message is showing when you pass the mouse cursor on the warning icon?

[jd2]

Hi SofLit,

Here is the message:

Best,

JD

[SofLit]

Hello,

I think you can go ahead and ignore that warning. 

If you notice any missing in the FMC config in the generated code, you can notify us.

[MNapi · Accepted solution]

see my configuration I have the same chip connected to IS42S16400J-7TL (SDRAM 64 Mbit )

all is working fine

[jd2]

Dear MNapi and SofLit,

Thank you for your answers, you've been so helpful. I'll proceed with my design.

Best,

JD

[MNapi]

if you want to use the same memory chip

you need to initialize it:

void SDRAM_Initialization_Sequence( void )
{
__IO unsigned long tmpmrd = 0;
FMC_SDRAM_CommandTypeDef cmd;
FMC_SDRAM_CommandTypeDef * Command = &cmd;

/* Step 3: Configure a clock configuration enable command */
Command->CommandMode = FMC_SDRAM_CMD_CLK_ENABLE;
Command->CommandTarget = FMC_SDRAM_CMD_TARGET_BANK1;
Command->AutoRefreshNumber = 1;
Command->ModeRegisterDefinition = 0;

/* Send the command */
HAL_SDRAM_SendCommand( &hsdram1, Command, 0x1000 );

/* Step 4: Insert 100 ms delay */
HAL_Delay( 100 );

/* Step 5: Configure a PALL (precharge all) command */
Command->CommandMode = FMC_SDRAM_CMD_PALL;
Command->CommandTarget = FMC_SDRAM_CMD_TARGET_BANK1;
Command->AutoRefreshNumber = 1;
Command->ModeRegisterDefinition = 0;

/* Send the command */
HAL_SDRAM_SendCommand( &hsdram1, Command, 0x1000 );

/* Step 6 : Configure a Auto-Refresh command */
Command->CommandMode = FMC_SDRAM_CMD_AUTOREFRESH_MODE;
Command->CommandTarget = FMC_SDRAM_CMD_TARGET_BANK1;
Command->AutoRefreshNumber = 4;
Command->ModeRegisterDefinition = 0;

/* Send the command */
HAL_SDRAM_SendCommand( &hsdram1, Command, 0x1000 );

/* Step 7: Program the external memory mode register */
tmpmrd = ( uint32_t )SDRAM_MODEREG_BURST_LENGTH_2 |
SDRAM_MODEREG_BURST_TYPE_SEQUENTIAL | SDRAM_MODEREG_CAS_LATENCY_3 |
SDRAM_MODEREG_OPERATING_MODE_STANDARD |
SDRAM_MODEREG_WRITEBURST_MODE_SINGLE;

Command->CommandMode = FMC_SDRAM_CMD_LOAD_MODE;
Command->CommandTarget = FMC_SDRAM_CMD_TARGET_BANK1;
Command->AutoRefreshNumber = 1;
Command->ModeRegisterDefinition = tmpmrd;

/* Send the command */
HAL_SDRAM_SendCommand( &hsdram1, Command, 0x1000 );

/* Step 8: Set the refresh rate counter */
/* (15.62 us x Freq) - 20 */
/* Set the device refresh counter */
HAL_SDRAM_ProgramRefreshRate( &hsdram1, REFRESH_COUNT );
}

and here is the code to test it.

/* USER CODE BEGIN 2 */

SDRAM_Initialization_Sequence();



/* Write data to the SDRAM memory */
for (uwIndex = 0; uwIndex < BUFFER_SIZE; uwIndex++)
{
*(__IO uint32_t*) (SDRAM_BANK_ADDR + WRITE_READ_ADDR + 4*uwIndex) = aTxBuffer[uwIndex];
}

for (uint16_t i= 0; i < BUFFER_SIZE; i++)
{
aRxBuffer[i] = 0;
}

HAL_Delay(10);

/* Read back data from the SDRAM memory */
for (uwIndex = 0; uwIndex < BUFFER_SIZE; uwIndex++)
{
aRxBuffer[uwIndex] = *(__IO uint32_t*) (SDRAM_BANK_ADDR + WRITE_READ_ADDR + 4*uwIndex);
}
/* USER CODE END 2 */

it worked fine the first time.