From b073c19f9ec330423fa07c66d1c0604883044f6b Mon Sep 17 00:00:00 2001 From: Josh Rahm Date: Sat, 21 Nov 2020 21:24:04 -0700 Subject: Added halloc for allocating memory on the heap. The new halloc() call allocates memory on the STM32l's SRAM2 starting right above the DATA section. The implementation uses a very-dense, albeit slower, linked-list allocation as opposed to fancy B-trees or something. However, the overhead is just 1 32-bit word per allocation and thus allows for reasonably dense memory-packing on the small 16K memory chip. --- 02-usart/include/arch/arm/arch.h | 3 +++ 1 file changed, 3 insertions(+) (limited to '02-usart/include/arch/arm/arch.h') diff --git a/02-usart/include/arch/arm/arch.h b/02-usart/include/arch/arm/arch.h index 569ca77..f140c97 100644 --- a/02-usart/include/arch/arm/arch.h +++ b/02-usart/include/arch/arm/arch.h @@ -33,4 +33,7 @@ _Static_assert(sizeof(void*) == sizeof(uint32_t), "Pointers must be 32 bits"); #endif +extern uint32_t DATA_SEGMENT_START; +extern uint32_t DATA_SEGMENT_STOP; + #endif /* ARCH_H_ */ -- cgit