void*ReceiveBuff485dma;
ReceiveBuff485dma = (uint8_t*) calloc(DMA_BUFFER_SIZE_RECEIVE_RS485,sizeof(uint8_t));

memset(ReceiveBuff485dma,0x10,DMA_BUFFER_SIZE_RECEIVE_RS485);

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
DMA_InitTypeDef dma;
DMA_StructInit(&dma);
dma.DMA_PeripheralBaseAddr = (uint32_t)&(USART3->DR);
dma.DMA_Memory0BaseAddr = (uint32_t)ReceiveBuff485dma;
dma.DMA_DIR = DMA_DIR_PeripheralToMemory;
dma.DMA_BufferSize = DMA_BUFFER_SIZE_RECEIVE_RS485;
dma.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
dma.DMA_MemoryInc = DMA_MemoryInc_Enable;
dma.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
dma.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
dma.DMA_Channel = DMA_Channel_4;
dma.DMA_Mode = DMA_Mode_Circular;
DMA_Init(DMA1_Stream1, &dma);

USART_Cmd(USART3, ENABLE);
USART_DMACmd(USART3, USART_DMAReq_Rx, ENABLE);
DMA_Cmd(DMA1_Stream1, ENABLE);




///**********cycl*

while(DMA_GetFlagStatus(DMA1_Stream1, DMA_FLAG_TCIF1) == RESET);
DMA_ClearFlag(DMA1_Stream1, DMA_FLAG_HTIF1 | DMA_FLAG_TCIF1);
contdatareceive = DMA_GetCurrDataCounter(DMA1_Stream1);

DMA_Cmd(DMA1_Stream1, DISABLE);
//USART_SendData(USART3,contdatareceive);//для проверки отправляет правильное число байт

if((DMA_BUFFER_SIZE_RECEIVE_RS485 - contdatareceive)>1){

for(ii = 0; ii<255; ii++){USART_SendData(USART3,*((uint8_t*)ReceiveBuff485dma+ii)); while(USART_GetFlagStatus(USART3,USART_FLAG_TXE)==RESET);}
//здесь должны быть отправлены полученные данные а уходят то что записывает в начале инициализации memset. Dma ничего не записывает в ReceiveBuff485dma.


}

DMA_SetCurrDataCounter(DMA1_Stream1,DMA_BUFFER_SIZE_RECEIVE_RS485);
DMA_Cmd(DMA1_Stream1, ENABLE);
//*****cycl

  for(ii = 0; ii<255; ii++){USART_SendData(USART3,*((uint8_t*)ReceiveBuff485dma+ii)); while(USART_GetFlagStatus(USART3,USART_FLAG_TXE)==RESET);}

caddr_t _sbrk(int incr)
{
extern char __stack_start__;
extern char __stack_end__;
static char *current_heap_end = &__stack_start__;
char *previous_heap_end;

previous_heap_end = current_heap_end;

if (current_heap_end + incr > &__stack_end__)
{
errno = ENOMEM;
return (caddr_t) -1;
}

current_heap_end += incr;

return (caddr_t)previous_heap_end;
}

/* Entry Point */
ENTRY(Reset_Handler)

/* Highest address of the user mode stack */
_estack = 0x2001FFFF; /* end of RAM */

/* Generate a link error if heap and stack don't fit into RAM */
_Min_Heap_Size = 0; /* required amount of heap */
_Min_Stack_Size = 0x2000; /* required amount of stack */

/* Specify the memory areas */
MEMORY
{
FLASH (rx) : ORIGIN = 0x8000000, LENGTH = 1024K
RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 128K
CCMRAM (rw) : ORIGIN = 0x10000000, LENGTH = 64K
}

/* Define output sections */
SECTIONS
{
/* The startup code goes first into FLASH */
.isr_vector :
{
. = ALIGN(4);
KEEP(*(.isr_vector)) /* Startup code */
. = ALIGN(4);
} >FLASH

/* The program code and other data goes into FLASH */
.text :
{
. = ALIGN(4);
*(.text) /* .text sections (code) */
*(.text*) /* .text* sections (code) */
*(.glue_7) /* glue arm to thumb code */
*(.glue_7t) /* glue thumb to arm code */
*(.eh_frame)

KEEP (*(.init))
KEEP (*(.fini))

. = ALIGN(4);
_etext = .; /* define a global symbols at end of code */
} >FLASH

/* Constant data goes into FLASH */
.rodata :
{
. = ALIGN(4);
*(.rodata) /* .rodata sections (constants, strings, etc.) */
*(.rodata*) /* .rodata* sections (constants, strings, etc.) */
. = ALIGN(4);
} >FLASH

.ARM.extab : { *(.ARM.extab* .gnu.linkonce.armextab.*) } >FLASH
.ARM : {
__exidx_start = .;
*(.ARM.exidx*)
__exidx_end = .;
} >FLASH

.preinit_array :
{
PROVIDE_HIDDEN (__preinit_array_start = .);
KEEP (*(.preinit_array*))
PROVIDE_HIDDEN (__preinit_array_end = .);
} >FLASH
.init_array :
{
PROVIDE_HIDDEN (__init_array_start = .);
KEEP (*(SORT(.init_array.*)))
KEEP (*(.init_array*))
PROVIDE_HIDDEN (__init_array_end = .);
} >FLASH
.fini_array :
{
PROVIDE_HIDDEN (__fini_array_start = .);
KEEP (*(SORT(.fini_array.*)))
KEEP (*(.fini_array*))
PROVIDE_HIDDEN (__fini_array_end = .);
} >FLASH

/* used by the startup to initialize data */
_sidata = LOADADDR(.data);

/* Initialized data sections goes into RAM, load LMA copy after code */
.data :
{
. = ALIGN(4);
_sdata = .; /* create a global symbol at data start */
*(.data) /* .data sections */
*(.data*) /* .data* sections */

. = ALIGN(4);
_edata = .; /* define a global symbol at data end */
} >RAM AT> FLASH

_siccmram = LOADADDR(.ccmram);

/* CCM-RAM section
*
* IMPORTANT NOTE!
* If initialized variables will be placed in this section,
* the startup code needs to be modified to copy the init-values.
*/
.ccmram :
{
. = ALIGN(4);
_sccmram = .; /* create a global symbol at ccmram start */
*(.ccmram)
*(.ccmram*)

. = ALIGN(4);
_eccmram = .; /* create a global symbol at ccmram end */
} >CCMRAM AT> FLASH


/* Uninitialized data section */
. = ALIGN(4);
.bss :
{
/* This is used by the startup in order to initialize the .bss secion */
_sbss = .; /* define a global symbol at bss start */
__bss_start__ = _sbss;
*(.bss)
*(.bss*)
*(COMMON)

. = ALIGN(4);
_ebss = .; /* define a global symbol at bss end */
__bss_end__ = _ebss;
} >RAM



.stack :
{
__stack_start__ = .;
. = ALIGN (4);
. += _Min_Stack_Size;
. = ALIGN (4);
__stack_end__ = .;
. = ALIGN (4);
} >RAM



/* Remove information from the standard libraries */
/DISCARD/ :
{
libc.a ( * )
libm.a ( * )
libgcc.a ( * )
}

.ARM.attributes 0 : { *(.ARM.attributes) }
}

                0x20000734                . = ALIGN (0x4)
                0x20000734                _ebss = .
                0x20000734                __bss_end__ = _ebss

.stack          0x20000734     0x2000
                0x20000734                __stack_start__ = .
                0x20000734                . = ALIGN (0x4)
                0x20002734                . = (. + _Min_Stack_Size)
*fill*         0x20000734     0x2000
                0x20002734                . = ALIGN (0x4)
                0x20002734                __stack_end__ = .
                0x20002734                . = ALIGN (0x4)