79 lines
1.9 KiB
Plaintext
79 lines
1.9 KiB
Plaintext
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README.txt
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==========
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STM32F746G-DISCO LTDC Framebuffer demo example
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Preparation
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-----------
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As of writing this text, SDRAM support is not implemented for this board.
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Therefore to make this demo work following changes are required to heap
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management function:
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diff --git a/stm32_allocateheap.c b/stm32_allocateheap.c
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--- a/stm32_allocateheap.c
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+++ b/stm32_allocateheap.c
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@@ -93,7 +93,7 @@
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/* Set the start and end of SRAM1 and SRAM2 */
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#define SRAM1_START STM32_SRAM1_BASE
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-#define SRAM1_END (SRAM1_START + STM32F7_SRAM1_SIZE)
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+#define SRAM1_END (SRAM1_START + 131072)
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#define SRAM2_START STM32_SRAM2_BASE
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#define SRAM2_END (SRAM2_START + STM32F7_SRAM2_SIZE)
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@@ -385,17 +385,17 @@ void up_addregion(void)
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/* Allow user-mode access to the STM32F20xxx/STM32F40xxx SRAM2 heap */
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- stm32_mpu_uheap((uintptr_t)SRAM2_START, SRAM2_END-SRAM2_START);
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+/* stm32_mpu_uheap((uintptr_t)SRAM2_START, SRAM2_END-SRAM2_START); */
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#endif
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/* Colorize the heap for debug */
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- up_heap_color((FAR void *)SRAM2_START, SRAM2_END-SRAM2_START);
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+/* up_heap_color((FAR void *)SRAM2_START, SRAM2_END-SRAM2_START); */
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/* Add the STM32F20xxx/STM32F40xxx SRAM2 user heap region. */
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- kumm_addregion((FAR void *)SRAM2_START, SRAM2_END-SRAM2_START);
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+/* kumm_addregion((FAR void *)SRAM2_START, SRAM2_END-SRAM2_START); */
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#ifdef HAVE_DTCM
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#if defined(CONFIG_BUILD_PROTECTED) && defined(CONFIG_MM_KERNEL_HEAP)
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Configure and build
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-------------------
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tools/configure.sh stm32f746g-disco/fb
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make
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Configuration
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------------
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This configuration provides 1 LTDC with
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8pp CLUT pixel format and a resolution of 480x272.
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Loading
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-------
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st-flash write nuttx.bin 0x8000000
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Executing
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---------
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The ltdc is initialized during boot up. Interaction with NSH is via the serial
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console at 115200 8N1 baud. From the nsh comandline execute the fb example:
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nsh> fb
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The test will put a pattern of concentric squares in the framebuffer and
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terminate.
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