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Posted to commits@nuttx.apache.org by GitBox <gi...@apache.org> on 2020/08/28 15:25:28 UTC

[GitHub] [incubator-nuttx] patacongo commented on issue #1643: stm32f746g-disco:lvgl, fb, nxdemo, nxterm "arm_hardfault: PANIC!!! Hard fault:"

patacongo commented on issue #1643:
URL: https://github.com/apache/incubator-nuttx/issues/1643#issuecomment-682707704


   
   > For stm32f429i-disco it is about 300KiB, try to use the same value:
   > CONFIG_STM32_LTDC_FB_SIZE=307200
   >
   This is the internal SRAM:
   
   CONFIG_RAM_SIZE=114688
   CONFIG_RAM_START=0x20000000
   
   The internal SRAM is insufficient to support frambebuffers. There are 
   two framebuffers in the fb configuration that lie in external RAM:
   
   CONFIG_STM32_DMA2D_FB_BASE=0xD07B5000
   CONFIG_STM32_DMA2D_FB_SIZE=307200
   
   CONFIG_STM32_LTDC_FB_BASE=0xD076A000
   CONFIG_STM32_LTDC_FB_SIZE=307200
   
   The address is determined by which FMC chip select you use.  The 
   framebuffers are excluded from the heap via:
   
   CONFIG_HEAP2_BASE=0xD0000000
   CONFIG_HEAP2_SIZE=7774208
   
   Just setting the framebuffer size without initializing and managing the 
   external memory would not work.
   
   
   


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