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Zakba.1
Zakba.1
Associate III
December 15, 2021
Question

wildcard characters are not readable

  • December 15, 2021
  • 1 reply
  • 746 views

Hi

I use touch gfx wildcard to show characters and variables in the text area but the characters are shown like the attached photo... I configured the MPU as follows but still does not work.

I would appreciate any help. I will upload the LCD photo and MPU codes.

PS:I use stm32f767ig

SDRAM

Qspi

fonts and texts are in IROM.

void MPU_Config(void)
{
 MPU_Region_InitTypeDef MPU_InitStruct = {0};
 
 /* Disables the MPU */
 HAL_MPU_Disable();
	
	 /** Initializes and configures the Region and the memory to be protected
 */
 MPU_InitStruct.Enable = MPU_REGION_ENABLE;
 MPU_InitStruct.Number = MPU_REGION_NUMBER0;
 MPU_InitStruct.BaseAddress = 0x60000000;
 MPU_InitStruct.Size = MPU_REGION_SIZE_64MB;
 MPU_InitStruct.SubRegionDisable = 0x0;
 MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
 MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
 MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_DISABLE;
 MPU_InitStruct.IsShareable = MPU_ACCESS_NOT_SHAREABLE;
 MPU_InitStruct.IsCacheable = MPU_ACCESS_NOT_CACHEABLE;
 MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;
 
 /** Initializes and configures the Region and the memory to be protected
 */
 MPU_InitStruct.Enable = MPU_REGION_ENABLE;
 MPU_InitStruct.Number = MPU_REGION_NUMBER1;
 MPU_InitStruct.BaseAddress = 0x90000000;
 MPU_InitStruct.Size = MPU_REGION_SIZE_32MB;
 MPU_InitStruct.SubRegionDisable = 0x0;
 MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
 MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
 MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_DISABLE;
 MPU_InitStruct.IsShareable = MPU_ACCESS_SHAREABLE;
 MPU_InitStruct.IsCacheable = MPU_ACCESS_NOT_CACHEABLE;
 MPU_InitStruct.IsBufferable = MPU_ACCESS_NOT_BUFFERABLE;
 
	
 /** Initializes and configures the Region and the memory to be protected 
 */
 MPU_InitStruct.Enable = MPU_REGION_ENABLE;
 MPU_InitStruct.Number = MPU_REGION_NUMBER2;
 MPU_InitStruct.BaseAddress = 0xC0000000;
 MPU_InitStruct.Size = MPU_REGION_SIZE_32MB;
 MPU_InitStruct.SubRegionDisable = 0x0;
 MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
 MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
 MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_DISABLE;
 MPU_InitStruct.IsShareable = MPU_ACCESS_NOT_SHAREABLE;
 MPU_InitStruct.IsCacheable = MPU_ACCESS_CACHEABLE;
 MPU_InitStruct.IsBufferable = MPU_ACCESS_BUFFERABLE;
	
	 /** Initializes and configures the Region and the memory to be protected 
 */
 MPU_InitStruct.Enable = MPU_REGION_ENABLE;
 MPU_InitStruct.Number = MPU_REGION_NUMBER3;
 MPU_InitStruct.BaseAddress = 0x20000000;
 MPU_InitStruct.Size = MPU_REGION_SIZE_512KB;
 MPU_InitStruct.SubRegionDisable = 0x0;
 MPU_InitStruct.TypeExtField = MPU_TEX_LEVEL0;
 MPU_InitStruct.AccessPermission = MPU_REGION_FULL_ACCESS;
 MPU_InitStruct.DisableExec = MPU_INSTRUCTION_ACCESS_DISABLE;
 MPU_InitStruct.IsShareable = MPU_ACCESS_NOT_SHAREABLE;
 MPU_InitStruct.IsCacheable = MPU_ACCESS_CACHEABLE;
 MPU_InitStruct.IsBufferable = MPU_ACCESS_BUFFERABLE;
	
	
 HAL_MPU_ConfigRegion(&MPU_InitStruct);
 /* Enables the MPU */
 HAL_MPU_Enable(MPU_PRIVILEGED_DEFAULT);
 
}

0693W00000HofGXQAZ.jpg

This topic has been closed for replies.

1 reply

N. SANTINI
N. SANTINI
ST Employee
December 16, 2021

Hi,

From this screenshot it looks like you have a cache issue.

Where is your frame buffer located ?

If it is in external SDRAM (0xC0000000) then I would suggest to set the region as MPU_ACCESS_SHAREABLE.

This indicates that several masters can access it (here LTDC and DMA2D) and that cache must be disabled to guarantee data coherency.

Best regards,

Nicolas

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