Why can't I use all SRAMs?

STM32F407VGT6 -> this controller have 192kb of sram, I create a big byte array have 131832 byte and i got an error in Keil.

Any idea why?

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Best answer by Andreas Bolsch

Datasheet "Figure 18. STM32F40x memory map": The SRAM consists of three blocks, non-contiguos ...

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Datasheet "Figure 18. STM32F40x memory map": The SRAM consists of three blocks, non-contiguos ...

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So, what happend when i switch on IRAM2?

If IRAM2 is off, i cant use all of 128k sram.

Guru

You're allocating more than 128KB, and you also have the stack, heap and other variables fighting for the same space.

You should perhaps be using a Scatter File, and defining what goes into the 0x10000000 [64KB] CCM region, like the heap, stack, etc.

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