【GD32F427开发板试用】+rtt-thread nano+finsh极简开发

引言

在工作闲暇之际，逛逛论坛，无意间看到GD的试用活动，一如既往的积极，在官方还没发布时就申请了，也如愿的收到了板子，感谢官方和社区给了探索这块板子的机会。

Why rtt

RT-Thread Nano 是一个极简版的硬实时内核，它是由 C 语言开发，采用面向对象的编程思维，具有良好的代码风格，是一款可裁剪的、抢占式实时多任务的 RTOS。其内存资源占用极小，功能包括任务处理、软件定时器、信号量、邮箱和实时调度等相对完整的实时操作系统特性。只需内核与Finsh就足够使用，简单方便，个人不喜欢太复杂。

资源

GD32F427VKT6
32位Arm®Cortex®-M4处理器内核
高达200 MHz的工作频率
3072K Flash
256k SRAM
4个USART和4个UART，3个I2C，6个SPI，2个I2S，2个CAN2.0B
1个SDIO接口、1个10/100M以太网控制器
3个采样率高达2.6M SPS的12位高速ADC和2个12位DAC，
单循环乘法和硬件除法器
浮点单元（FPU）
集成DSP指令
集成嵌套矢量中断控制器（NVIC）
24位SysTick定时器
板载：
GDlink(可惜只能作为下载，没有串口)
复位按键和用户按键
一个用户LED
USB_HS、USB_FS等
开发前准备
资料下载地址：

https://aijishu.com/a/1060000000356925

安装芯片包
keil安装rtt包
rtt移植
打开LED工程
添加rtt源码
board.c处理
屏蔽"gd32f4xx_it.c"中HardFault_Handler、PendSV_Handler、 SysTick_Handler函数
将裸机的延时函数换成操作系统的延时函数

添加Finsh

在添加Finsh前先准备串口
这里一点需要注意的地方，先上原理图在解释，PA9和PA3已经被占用，使用串口跳过这两个引脚
串口7.jpg

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


//int fputc(int ch, FILE *f)

//{

//        /* 将Printf内容发往串口 */

//        usart_data_transmit(USART1, (unsigned char) ch);

////        while (!(USART1->SR & USART_FLAG_TXE));

//        while( usart_flag_get(USART1,USART_FLAG_TC)!= SET);        

//        return (ch);

//}

void usart_init(int32_t bound)
{
  rcu_periph_clock_enable( RCU_GPIOD);

  /* enable USART clock */
  rcu_periph_clock_enable(RCU_USART1);

  /* connect port to USARTx_Tx */
  gpio_af_set(GPIOD, GPIO_AF_7, GPIO_PIN_5);

  /* connect port to USARTx_Rx */
  gpio_af_set(GPIOD, GPIO_AF_7, GPIO_PIN_6);

  /* configure USART Tx as alternate function push-pull */
  gpio_mode_set(GPIOD, GPIO_MODE_AF, GPIO_PUPD_PULLUP,GPIO_PIN_5);
  gpio_output_options_set(GPIOD, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ,GPIO_PIN_5);

  /* configure USART Rx as alternate function push-pull */
  gpio_mode_set(GPIOD, GPIO_MODE_AF, GPIO_PUPD_PULLUP,GPIO_PIN_6);
  gpio_output_options_set(GPIOD, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ,GPIO_PIN_6);

  /* USART configure */
  usart_deinit(USART1);
  usart_baudrate_set(USART1,bound);
  usart_receive_config(USART1, USART_RECEIVE_ENABLE);
  usart_transmit_config(USART1, USART_TRANSMIT_ENABLE);
  
//    nvic_irq_enable(USART1_IRQn, 2, 0);//设置串口中断的优先级
//    //开启串口接收中断
//    usart_interrupt_enable(USART1, USART_INT_RBNE);
  usart_enable(USART1);
}


//void USART1_IRQHandler(void)
//{
//    uint8_t rx_data = 0;
//    //当接收中断发生
//    if((RESET != usart_interrupt_flag_get(USART1, USART_INT_FLAG_RBNE)) && 
//       (RESET != usart_flag_get(USART1, USART_FLAG_RBNE))){
//        /* Read one byte from the receive data register */
//        rx_data = (uint8_t)usart_data_receive(USART1);//获取接收到的数据
////           rt_kprintf("rx_data is %d",rx_data);
//    }
//    
//     //当发送中断发生
//    if((RESET != usart_flag_get(USART1, USART_FLAG_TBE)) && 
//       (RESET != usart_interrupt_flag_get(USART1, USART_INT_FLAG_TBE))){
//        /* Write one byte to the transmit data register */
//    }
//}

添加Finsh源码
在rtconfig.h中打开finsh_config.h

board.c中初始化串口

/*
 * Copyright (c) 2006-2019, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 * 2021-05-24                  the first version
 */

#include <rthw.h>
#include <rtthread.h>
#include "systick.h"
#include "gd32f4xx.h"
#include "usart.h"

#if defined(RT_USING_USER_MAIN) && defined(RT_USING_HEAP)
/*
 * Please modify RT_HEAP_SIZE if you enable RT_USING_HEAP
 * the RT_HEAP_SIZE max value = (sram size - ZI size), 1024 means 1024 bytes
 */
#define RT_HEAP_SIZE (20*1024)
static rt_uint8_t rt_heap[RT_HEAP_SIZE];

RT_WEAK void *rt_heap_begin_get(void)
{
  return rt_heap;
}

RT_WEAK void *rt_heap_end_get(void)
{
  return rt_heap + RT_HEAP_SIZE;
}
#endif

void rt_os_tick_callback(void)
{
  rt_interrupt_enter();
  
  rt_tick_increase();

  rt_interrupt_leave();
}


/* cortex-m 架构使用 SysTick_Handler() */
void SysTick_Handler()
{
  rt_os_tick_callback();

}

/**
 * This function will initial your board.
 */
void rt_hw_board_init(void)
{
//#error "TODO 1: OS Tick Configuration."
  /* 
   * TODO 1: OS Tick Configuration
   * Enable the hardware timer and call the rt_os_tick_callback function
   * periodically with the frequency RT_TICK_PER_SECOND. 
   */

   systick_config();
   SysTick_Config(SystemCoreClock / RT_TICK_PER_SECOND);
   usart_init(115200);

  /* Call components board initial (use INIT_BOARD_EXPORT()) */
#ifdef RT_USING_COMPONENTS_INIT
  rt_components_board_init();
#endif

#if defined(RT_USING_USER_MAIN) && defined(RT_USING_HEAP)
  rt_system_heap_init(rt_heap_begin_get(), rt_heap_end_get());
#endif
}

#ifdef RT_USING_CONSOLE

//static int uart_init(void)
//{
//#error "TODO 2: Enable the hardware uart and config baudrate."
//    return 0;
//}
//INIT_BOARD_EXPORT(uart_init);

void uart_send_byte(rt_uint8_t data)
{
   while( usart_flag_get(USART1,USART_FLAG_TC)!= SET);   
    usart_data_transmit(USART1, (unsigned char) data);
  
}

void rt_hw_console_output(const char *str)
{
//#error "TODO 3: Output the string 'str' through the uart."
  
  rt_size_t i = 0, size = 0;
  char a = '\r';

//    __HAL_UNLOCK(&UartHandle);

  size = rt_strlen(str);
  for (i = 0; i < size; i++)
  {
      if (*(str + i) == '\n')
      {
         uart_send_byte(a);
      }
       uart_send_byte( *(str + i) );
  }
}

#endif

在finsh_port.c中添加接收代码

/*
 * Copyright (c) 2006-2021, RT-Thread Development Team
 *
 * SPDX-License-Identifier: Apache-2.0
 *
 * Change Logs:
 * Date           Author       Notes
 */

#include <rthw.h>
#include <rtconfig.h>
#include "usart.h"


#ifndef RT_USING_FINSH
#error Please uncomment the line <#include "finsh_config.h"> in the rtconfig.h 
#endif

#ifdef RT_USING_FINSH

RT_WEAK char rt_hw_console_getchar(void)
{
  /* Note: the initial value of ch must < 0 */
  int ch = -1;

//#error "TODO 4: Read a char from the uart and assign it to 'ch'."
  
  if( usart_flag_get(USART1,USART_FLAG_RBNE) != RESET)  //接收中断(接收到的数据必须是0x0d 0x0a结尾)
  {
      ch = (uint8_t)usart_data_receive(USART1) & 0xff;
//        rt_kprintf("ch is %d",ch);
  }
  else 
  {
      if( usart_flag_get(USART1, USART_FLAG_ORERR) != RESET)  //
      {
           usart_flag_clear(USART1, USART_FLAG_RBNE);
      }
      rt_thread_mdelay(10);
  }

  return ch;
}

#endif /* RT_USING_FINSH */

运行结果

下载程序，打开终端
输入一个命令list_thread

引言

Why rtt

资源

开发前准备

rtt移植

添加Finsh

运行结果

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目录