嘗試外擴SRAM，以下是我的ld代碼，修改字段標紅

ENTRY( _start )

__stack_size = 2048;

PROVIDE( _stack_size = __stack_size );

MEMORY

{

/* CH32V30x_D8C - CH32V305RB-CH32V305FB

? ?CH32V30x_D8 - CH32V303CB-CH32V303RB

*/

/*

FLASH (rx) : ORIGIN = 0x00000000, LENGTH = 128K

RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 32K

*/

? ??

/* CH32V30x_D8C - CH32V307VC-CH32V307WC-CH32V307RC

? ?CH32V30x_D8 - CH32V303VC-CH32V303RC

? ?FLASH + RAM supports the following configuration

? ?FLASH-192K + RAM-128K

? ?FLASH-224K + RAM-96K

? ?FLASH-256K + RAM-64K??

? ?FLASH-288K + RAM-32K??

*/

FLASH (rx) : ORIGIN = 0x00000000, LENGTH = 256K

RAM (xrw) : ORIGIN = 0x20000000, LENGTH = 64K

SRAM (xrw) : ORIGIN = 0x60000000, LENGTH = 64K

}

SECTIONS

{

.init :

{

_sinit = .;

. = ALIGN(4);

KEEP(*(SORT_NONE(.init)))

. = ALIGN(4);

_einit = .;

} >FLASH AT>FLASH

? .vector :

? {

? ? ? *(.vector);

? . = ALIGN(64);

? } >FLASH AT>FLASH

.text :

{

. = ALIGN(4);

*(.text)

*(.text.*)

*(.rodata)

*(.rodata*)

*(.gnu.linkonce.t.*)

. = ALIGN(4);

} >FLASH AT>FLASH?

.fini :

{

KEEP(*(SORT_NONE(.fini)))

. = ALIGN(4);

} >FLASH AT>FLASH

PROVIDE( _etext = . );

PROVIDE( _eitcm = . );

.preinit_array? :

{

? PROVIDE_HIDDEN (__preinit_array_start = .);

? KEEP (*(.preinit_array))

? PROVIDE_HIDDEN (__preinit_array_end = .);

} >FLASH AT>FLASH?

.init_array? ? ?:

{

? PROVIDE_HIDDEN (__init_array_start = .);

? KEEP (*(SORT_BY_INIT_PRIORITY(.init_array.*) SORT_BY_INIT_PRIORITY(.ctors.*)))

? KEEP (*(.init_array EXCLUDE_FILE (*crtbegin.o *crtbegin?.o *crtend.o *crtend?.o ) .ctors))

? PROVIDE_HIDDEN (__init_array_end = .);

} >FLASH AT>FLASH?

.fini_array? ? ?:

{

? PROVIDE_HIDDEN (__fini_array_start = .);

? KEEP (*(SORT_BY_INIT_PRIORITY(.fini_array.*) SORT_BY_INIT_PRIORITY(.dtors.*)))

? KEEP (*(.fini_array EXCLUDE_FILE (*crtbegin.o *crtbegin?.o *crtend.o *crtend?.o ) .dtors))

? PROVIDE_HIDDEN (__fini_array_end = .);

} >FLASH AT>FLASH?

.ctors? ? ? ? ? :

{

? /* gcc uses crtbegin.o to find the start of

? ? ?the constructors, so we make sure it is

? ? ?first.? Because this is a wildcard, it

? ? ?doesn't matter if the user does not

? ? ?actually link against crtbegin.o; the

? ? ?linker won't look for a file to match a

? ? ?wildcard.? The wildcard also means that it

? ? ?doesn't matter which directory crtbegin.o

? ? ?is in.? */

? KEEP (*crtbegin.o(.ctors))

? KEEP (*crtbegin?.o(.ctors))

? /* We don't want to include the .ctor section from

? ? ?the crtend.o file until after the sorted ctors.

? ? ?The .ctor section from the crtend file contains the

? ? ?end of ctors marker and it must be last */

? KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .ctors))

? KEEP (*(SORT(.ctors.*)))

? KEEP (*(.ctors))

} >FLASH AT>FLASH?

.dtors? ? ? ? ? :

{

? KEEP (*crtbegin.o(.dtors))

? KEEP (*crtbegin?.o(.dtors))

? KEEP (*(EXCLUDE_FILE (*crtend.o *crtend?.o ) .dtors))

? KEEP (*(SORT(.dtors.*)))

? KEEP (*(.dtors))

} >FLASH AT>FLASH?

.dalign :

{

. = ALIGN(4);

PROVIDE(_data_vma = .);

} >RAM AT>FLASH

.dlalign :

{

. = ALIGN(4);?

PROVIDE(_data_lma = .);

} >FLASH AT>FLASH

.data :

{

? ? *(.gnu.linkonce.r.*)

? ? *(.data .data.*)

? ? *(.gnu.linkonce.d.*)

. = ALIGN(8);

? ? PROVIDE( __global_pointer$ = . + 0x800 );

? ? *(.sdata .sdata.*)

*(.sdata2.*)

? ? *(.gnu.linkonce.s.*)

? ? . = ALIGN(8);

? ? *(.srodata.cst16)

? ? *(.srodata.cst8)

? ? *(.srodata.cst4)

? ? *(.srodata.cst2)

? ? *(.srodata .srodata.*)

? ? . = ALIGN(4);

PROVIDE( _edata = .);

} >RAM AT>FLASH

.bss :

{

. = ALIGN(4);

PROVIDE( _sbss = .);

? ? ? *(.sbss*)

? ? ? ? *(.gnu.linkonce.sb.*)

*(.bss*)

? ? ? *(.gnu.linkonce.b.*)

*(COMMON*)

. = ALIGN(4);

PROVIDE( _ebss = .);

} >RAM AT>FLASH

PROVIDE( _end = _ebss);

PROVIDE( end = . );

? ? .stack ORIGIN(RAM) + LENGTH(RAM) - __stack_size :

? ? {

? ? ? ? PROVIDE( _heap_end = . );? ??

? ? ? ? . = ALIGN(4);

? ? ? ? PROVIDE(_susrstack = . );

? ? ? ? . = . + __stack_size;

? ? ? ? PROVIDE( _eusrstack = .);

? ? } >RAM?

.sram :

{

. = ALIGN(4);?

ORIGIN(SRAM);

. = ALIGN(4);?

} >SRAM

}

我在程序里面定義

static lv_color_t buf_1[MY_DISP_HOR_RES * 10]? ?__attribute__((section(".sram")));

清除obj文件重新編譯后出現(xiàn)如下錯誤

c:/mounriver/mounriver_studio/toolchain/risc-v embedded gcc/bin/../lib/gcc/riscv-none-embed/8.2.0/../../../../riscv-none-embed/bin/ld.exe:C:\Users\wky\Desktop\CH32V307 硬件SPI_DMA LCD\CH32V307 硬件SPI_DMA LCD\Ld\Link.ld:1: syntax error

collect2.exe: error: ld returned 1 exit status

make: *** [makefile:114: CH32V307VCT6.elf] Error 1

我不明白是什么原因。

我解決了這個問題，下面代碼為：

.sram :

{

. = ALIGN(4);

*(.sram);

. = ALIGN(4);

} >SRAM AT>FLASH

注意后面AT>FLASH，指的是程序運行的首地址（因為下載的代碼都是從內(nèi)部FLASH中運行）

定義的數(shù)組已經(jīng)可以擴到80了

static lv_color_t buf_1[MY_DISP_HOR_RES * 80]? __attribute__((section(".sram")));

但現(xiàn)在FLASH的大小制約了這一數(shù)字，我嘗試將數(shù)字提高，出現(xiàn)超出FLASH大小錯誤

我的FSMC的時鐘只能設置120MHZ，144MHZ會出現(xiàn)SRAM打印錯誤。120MHZ比144MHZ屏幕刷新率會出現(xiàn)下降的情況，大概會有幾幀的損失。將緩沖區(qū)放到外擴SRAM之后，屏幕刷新率下降了10FPS左右。

.sram?(NOLOAD)?:?
{
.?=?ALIGN(4);
*(.sram);
.?=?ALIGN(4);
}?>SRAM

謝謝兄弟