前言：

无意在微信看到了GD做活动，想到了第一时间体验一下，搭配RT-THREAD，也很方便使用。

主要：本文只使用keil进行测试验证，gcc和iar需自行修改

硬件准备：

GD32F427 start开发板+TTL(方便查看shell数据)

移植篇:

我们不需要从头移植，因为rt-thread已经有GD的bsp了，我们将gd32450z-eval复制改名成gd32427v-start

随后将最新的标准库替换掉

因为GD的库API是一样的，我们只需要把芯片差异处修改一下：

Libraries\SConscript:

import rtconfig
from building import *

# get current directory
cwd = GetCurrentDir()

# The set of source files associated with this SConscript file.

src = Glob('GD32F4xx_standard_peripheral/Source/*.c')
src += [cwd + '/CMSIS/GD/GD32F4xx/Source/system_gd32f4xx.c']

#add for startup script
if rtconfig.PLATFORM in ['gcc']:
    src += [cwd + '/CMSIS/GD/GD32F4xx/Source/GCC/startup_gd32f407_427.S']
elif rtconfig.PLATFORM in ['armcc', 'armclang']:
    src += [cwd + '/CMSIS/GD/GD32F4xx/Source/ARM/startup_gd32f407_427.s']
elif rtconfig.PLATFORM in ['iccarm']:
    src += [cwd + '/CMSIS/GD/GD32F4xx/Source/IAR/startup_gd32f407_427.s']

path = [
    cwd + '/CMSIS/GD/GD32F4xx/Include',
    cwd + '/CMSIS',
    cwd + '/GD32F4xx_standard_peripheral/Include',]

if GetDepend(['RT_USING_BSP_USB']):
    path += [cwd + '/GD32F4xx_usb_driver/Include']
    src  += [cwd + '/GD32F4xx_usb_driver/Source']

CPPDEFINES = ['USE_STDPERIPH_DRIVER']
CPPDEFINES += ['GD32F427']

group = DefineGroup('Libraries', src, depend = [''], CPPPATH = path, CPPDEFINES = CPPDEFINES)

Return('group')

board.h:

#ifndef __BOARD_H__
#define __BOARD_H__

#include <gd32f4xx.h>

#define EXT_SDRAM_BEGIN    (0xC0000000U) /* the begining address of external SDRAM */
#define EXT_SDRAM_END      (EXT_SDRAM_BEGIN + (32U * 1024 * 1024)) /* the end address of external SDRAM */

// <o> Internal SRAM memory size[Kbytes] <8-64>
//  <i>Default: 64
#ifdef __ICCARM__
// Use *.icf ram symbal, to avoid hardcode.
extern char __ICFEDIT_region_RAM_end__;
#define GD32_SRAM_END          &__ICFEDIT_region_RAM_end__
#else
#define GD32_SRAM_SIZE         192
#define GD32_SRAM_END          (0x20000000 + GD32_SRAM_SIZE * 1024)
#endif

#ifdef __CC_ARM
extern int Image$$RW_IRAM1$$ZI$$Limit;
#define HEAP_BEGIN    (&Image$$RW_IRAM1$$ZI$$Limit)
#elif __ICCARM__
#pragma section="HEAP"
#define HEAP_BEGIN    (__segment_end("HEAP"))
#else
extern int __bss_end;
#define HEAP_BEGIN    (&__bss_end)
#endif

#define HEAP_END          GD32_SRAM_END

#endif

//*** <<< end of configuration section >>>    ***

因为PA9开发板接到了USB_VBUS，所以我们uart0使用PB6 PB7

    #ifdef BSP_USING_UART0
    {
        USART0,                                 // uart peripheral index
        USART0_IRQn,                            // uart iqrn
        RCU_USART0, RCU_GPIOB, RCU_GPIOB,       // periph clock, tx gpio clock, rt gpio clock
        GPIOB, GPIO_AF_7, GPIO_PIN_6,           // tx port, tx alternate, tx pin
        GPIOB, GPIO_AF_7, GPIO_PIN_7,          // rx port, rx alternate, rx pin
        &serial0,
        "uart0",
    },
    #endif

之后我们写测试代码：

#include <stdio.h>
#include <rtthread.h>

#include "drv_gpio.h"

#define LED2_PIN    GET_PIN(C, 6)

int main(void)
{
    rt_pin_mode(LED2_PIN, PIN_MODE_OUTPUT);
    while (1)
    {
        rt_pin_write(LED2_PIN, PIN_LOW);
        rt_thread_mdelay(500);
        rt_pin_write(LED2_PIN, PIN_HIGH);
        rt_thread_mdelay(500);
    }

}

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