本教程之記錄移植中關(guān)鍵過程吴超，不講解原理见芹。
1. 用cubemx生成工程
我這里用cubemx生成makefile工程剂娄。
幾個(gè)關(guān)鍵的點(diǎn)用圖片記錄下來
ETH1.png
接收描述符和發(fā)送描述符的地址特別注意，只能在D2域的RAM玄呛。
ETH2.png
開ETH中斷阅懦。
freertos1.png
lwip1.png
lwip2.png
lwip3.png
lwip4.png
MPU.png
2.makefile
在makefile文件中增加宏定義DATA_IN_D2_SRAM。
# C defines
C_DEFS = \
-DUSE_HAL_DRIVER \
-DSTM32H743xx \
-DDATA_IN_D2_SRAM
DATA_IN_D2_SRAM可以開啟D2域RAM的時(shí)鐘徘铝。在目錄Core\Src\system_stm32h7xx.c下有如幾行代碼耳胎。
#if defined(DATA_IN_D2_SRAM)
/* in case of initialized data in D2 SRAM (AHB SRAM), enable the D2 SRAM clock (AHB SRAM clock) */
#if defined(RCC_AHB2ENR_D2SRAM3EN)
RCC->AHB2ENR |= (RCC_AHB2ENR_D2SRAM1EN | RCC_AHB2ENR_D2SRAM2EN | RCC_AHB2ENR_D2SRAM3EN);
#elif defined(RCC_AHB2ENR_D2SRAM2EN)
RCC->AHB2ENR |= (RCC_AHB2ENR_D2SRAM1EN | RCC_AHB2ENR_D2SRAM2EN);
#else
RCC->AHB2ENR |= (RCC_AHB2ENR_AHBSRAM1EN | RCC_AHB2ENR_AHBSRAM2EN);
#endif /* RCC_AHB2ENR_D2SRAM3EN */
用來開啟D2_RAM1、D2_RAM2和D2_RAM3的時(shí)鐘惕它。這與很多網(wǎng)上教程中說的手動增加
__HAL_RCC_D2SRAM1_CLK_ENABLE();
__HAL_RCC_D2SRAM2_CLK_ENABLE();
__HAL_RCC_D2SRAM3_CLK_ENABLE();
是一樣的效果怕午。
3. STM32H743IITx_FLASH.ld
3.1 首先在STM32H743IITx_FLASH.ld中增加如下代碼：
/* ETH_CODE: add placement of DMA descriptors and RX buffers */
.lwip_sec (NOLOAD) :
{
. = ABSOLUTE(0x30040000);
*(.RxDecripSection)
. = ABSOLUTE(0x30040100);
*(.TxDecripSection)
. = ABSOLUTE(0x30040200);
*(.Rx_PoolSection)
} >RAM_D2
為什么這里的地址間隔是0x100?
RAM_D2中開辟出來的兩個(gè)存儲空間RxDecripSection和TxDecripSection分別用來存儲ETH的描述符DMARxDscrTab和DMATxDscrTab。
//LWIP\Target\ethernetif.c
ETH_DMADescTypeDef DMARxDscrTab[ETH_RX_DESC_CNT] __attribute__((section(".RxDecripSection"))); /* Ethernet Rx DMA Descriptors */
ETH_DMADescTypeDef DMATxDscrTab[ETH_TX_DESC_CNT] __attribute__((section(".TxDecripSection"))); /* Ethernet Tx DMA Descriptors */
ETH_RX_DESC_CNT= 4怠缸。
ETH_DMADescTypeDef 定義如下：
typedef struct
{
__IO uint32_t DESC0;
__IO uint32_t DESC1;
__IO uint32_t DESC2;
__IO uint32_t DESC3;
uint32_t BackupAddr0; /* used to store rx buffer 1 address */
uint32_t BackupAddr1; /* used to store rx buffer 2 address */
} ETH_DMADescTypeDef;
一個(gè)ETH_DMADescTypeDef 類型展6*4=24字節(jié)诗轻。DMARxDscrTab[ETH_RX_DESC_CNT]占用96個(gè)字節(jié)。0x100=256字節(jié)揭北，完全能放下DMARxDscrTab[ETH_RX_DESC_CNT]扳炬。
DMARxDscrTab和DMATxDscrTab必須強(qiáng)制鏈接到.RxDecripSection和.TxDecripSection段上去，且RxDecripSection和TxDecripSection必須在D2域的RAM上搔体。否則DMA報(bào)錯(cuò)恨樟。
D2域有3塊RAM:
D2_SRAM1：0x3000 0000 ~ 0x3001 FFFF
D2_SRAM2：0x3002 0000 ~ 0x3003 FFFF
D2_SRAM3：0x3004 0000 ~ 0x3004 7FFF
3.2 DTCMRAM改RAM_D1
STM32H743IITx_FLASH.ld中有多處DTCMRAM需要改成RAM_D1。懶得一處一處的記錄疚俱，直接貼文件如下：
/*
******************************************************************************
**
** File : LinkerScript.ld
**
** Author : STM32CubeMX
**
** Abstract : Linker script for STM32H743IITx series
** 2048Kbytes FLASH and 1056Kbytes RAM
**
** Set heap size, stack size and stack location according
** to application requirements.
**
** Set memory bank area and size if external memory is used.
**
** Target : STMicroelectronics STM32
**
** Distribution: The file is distributed “as is,” without any warranty
** of any kind.
**
*****************************************************************************
** @attention
**
** <h2><center>© COPYRIGHT(c) 2019 STMicroelectronics</center></h2>
**
** Redistribution and use in source and binary forms, with or without modification,
** are permitted provided that the following conditions are met:
** 1. Redistributions of source code must retain the above copyright notice,
** this list of conditions and the following disclaimer.
** 2. Redistributions in binary form must reproduce the above copyright notice,
** this list of conditions and the following disclaimer in the documentation
** and/or other materials provided with the distribution.
** 3. Neither the name of STMicroelectronics nor the names of its contributors
** may be used to endorse or promote products derived from this software
** without specific prior written permission.
**
** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
** AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
** IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
** DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
** FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
** DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
** SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
** CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
** OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
**
*****************************************************************************
*/
/* Entry Point */
ENTRY(Reset_Handler)
/* Highest address of the user mode stack */
_estack = ORIGIN(RAM_D1) + LENGTH(RAM_D1); /* end of RAM */
/* Generate a link error if heap and stack don't fit into RAM */
_Min_Heap_Size = 0x200; /* required amount of heap */
_Min_Stack_Size = 0x400; /* required amount of stack */
/* Specify the memory areas */
MEMORY
{
DTCMRAM (xrw) : ORIGIN = 0x20000000, LENGTH = 128K
RAM_D1 (xrw) : ORIGIN = 0x24000000, LENGTH = 512K
RAM_D2 (xrw) : ORIGIN = 0x30000000, LENGTH = 288K
RAM_D3 (xrw) : ORIGIN = 0x38000000, LENGTH = 64K
ITCMRAM (xrw) : ORIGIN = 0x00000000, LENGTH = 64K
FLASH (rx) : ORIGIN = 0x8000000, LENGTH = 2048K
}
/* 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_D1 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_D1
/* User_heap_stack section, used to check that there is enough RAM left */
._user_heap_stack :
{
. = ALIGN(8);
PROVIDE ( end = . );
PROVIDE ( _end = . );
. = . + _Min_Heap_Size;
. = . + _Min_Stack_Size;
. = ALIGN(8);
} >RAM_D1
/* ETH_CODE: add placement of DMA descriptors and RX buffers */
.lwip_sec (NOLOAD) :
{
. = ABSOLUTE(0x30040000);
*(.RxDecripSection)
. = ABSOLUTE(0x30040100);
*(.TxDecripSection)
. = ABSOLUTE(0x30040200);
*(.Rx_PoolSection)
} >RAM_D2
/* Remove information from the standard libraries */
/DISCARD/ :
{
libc.a ( * )
libm.a ( * )
libgcc.a ( * )
}
.ARM.attributes 0 : { *(.ARM.attributes) }
}
主要是原先分配給DTCMRAM的段劝术，改成了分配給RAM_D1。
移植lwip好幾天過不去呆奕，關(guān)鍵問題就在這里行贪。很多網(wǎng)上教程根本沒有提到這點(diǎn)愕难。DTCMRAM是CPU用的RAM，如果我們用的變量分配在這個(gè)區(qū)，LWIP死活不通粒梦。
4.ethernetif.c
在LWIP\Target\ethernetif.c中增加如下代碼南誊。
#if defined(__ICCARM__) /*!< IAR Compiler */
#pragma location = 0x30040200
extern u8_t memp_memory_RX_POOL_base[];
#elif defined(__CC_ARM) /* MDK ARM Compiler */
__attribute__((at(0x30040200)) extern u8_t memp_memory_RX_POOL_base[];
#elif defined(__GNUC__) /* GNU Compiler */
__attribute__((section(".Rx_PoolSection"))) extern u8_t memp_memory_RX_POOL_base[];
#endif
5.freertos.c
修改Core\Src\freertos.c中一個(gè)函數(shù)咒唆。
/* USER CODE BEGIN Includes */
#include "lwip/udp.h"
#include <string.h>
#include <stdio.h>
/* USER CODE END Includes */
void StartDefaultTask(void *argument)
{
/* init code for LWIP */
MX_LWIP_Init();
/* USER CODE BEGIN StartDefaultTask */
do
{
osDelay(1000);
} while (gnetif.ip_addr.addr == 0);
printf("ip: %d.%d.%d.%d.\r\n", ip4_addr1(&gnetif.ip_addr), ip4_addr2(&gnetif.ip_addr), ip4_addr3(&gnetif.ip_addr), ip4_addr4(&gnetif.ip_addr));
const char *message = "Hello UDP message!\n\r";
ip_addr_t PC_IPADDR;
IP_ADDR4(&PC_IPADDR, 192, 168, 3, 80);
struct udp_pcb *my_udp = udp_new();
udp_connect(my_udp, &PC_IPADDR, 55151);
struct pbuf *udp_buffer = NULL;
/* Infinite loop */
for (;;)
{
osDelay(1000);
/* !! PBUF_RAM is critical for correct operation !! */
udp_buffer = pbuf_alloc(PBUF_TRANSPORT, strlen(message), PBUF_RAM);
if (udp_buffer != NULL)
{
memcpy(udp_buffer->payload, message, strlen(message));
udp_send(my_udp, udp_buffer);
pbuf_free(udp_buffer);
}
}
/* USER CODE END StartDefaultTask */
}
先確認(rèn)DHCP分配到IP。然后創(chuàng)建一個(gè)UDP鏈接冒嫡。IP_ADDR4(&PC_IPADDR, 192, 168, 3, 80);是對方UDP地址。更加自己的修改四苇。
6.測試結(jié)果
注意關(guān)閉電腦的防火墻孝凌。
結(jié)果.png
直接共享代碼鏈接：
git clone git@gitee.com:xEndLess/stm32f743_freertos_lwip.git
