STM的堆可以更改嘛，最大可以更改为多少？

硬件工程师

STM的堆可以更改嘛，最大可以更改为多少？ [复制链接]

如题！（在malloc的时候出现了问题）
谢谢！

kjwhzx1985

这是开发工具的问题，要看你用的是什么工具。

chifeng0823

我用的是IAR。编译没有问题啊！只是在运作的时候，分配太大就会返回NULL。
搜索看到有的贴子说是512字节。不知道可不可以改。

wn1983

你可以看看IAR的帮助文件，如何设置堆的大小。

t63056

好的，谢谢！我马上去看！

a7016

请看黑体部分,你可以在链接脚本里分配HEAP的大小,但不建议你用这种方法,你可以考虑一下使用POOL方式,
uc/OS-II里有一个简单的POOL管理实现方法.
//
// Define a memory region that covers the entire 4 GB addressible space of the
// processor.
//
define memory mem with size = 4G;

//
// Define a region for the on-chip flash.
//
define region FLASH = mem:[from 0x8000000 to 0x807FFFF];

//
// Define a region for the on-chip SRAM.
//
define region SRAM = mem:[from 0x20000000 to 0x2000BFFF];

//
// Define a block for the heap. The size should be set to something other
// than zero if things in the C library that require the heap are used.
//
define block HEAP with alignment = 8, size = 0x00001000 { };
define block CSTACK with alignment = 8, size = 0x00000400 { };

//
// Indicate that the read/write values should be initialized by copying from
// flash.
//
initialize by copy { readwrite };

//
// Initicate that the noinit values should be left alone. This includes the
// stack, which if initialized will destroy the return address from the
// initialization code, causing the processor to branch to zero and fault.
//
do not initialize { section .noinit };

//
// Place the interrupt vectors at the start of flash.
//
place at start of FLASH { readonly section .intvec };

//
// Place the remainder of the read-only items into flash.
//
place in FLASH { readonly };

//
// Place all read/write items into SRAM.
//
place in SRAM { readwrite, block HEAP, block CSTACK};