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feat(attr): add new macro DMA_ATTR and WORD_ALIGNED_ATTR to help dma buffer declaration.

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michael
2017-11-16 17:31:15 +08:00
committed by Michael (Xiao Xufeng)
parent 3bc1a8318b
commit fcfcab7678
2 changed files with 56 additions and 0 deletions
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6
components/esp32/include/esp_attr.h
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@@ -26,6 +26,12 @@
// Forces data into DRAM instead of flash
#define DRAM_ATTR __attribute__((section(".dram1")))
// Forces data to be 4 bytes aligned
#define WORD_ALIGNED_ATTR __attribute__((aligned(4)))
// Forces data to be placed to DMA-capable places
#define DMA_ATTR WORD_ALIGNED_ATTR DRAM_ATTR
// Forces a string into DRAM instead of flash
// Use as ets_printf(DRAM_STR("Hello world!\n"));
#define DRAM_STR(str) (__extension__({static const DRAM_ATTR char __c[] = (str); (const char *)&__c;}))