GD32F303移植FreeRTOS-Plus-CLI

FreeRTOS移植好是没有命令行交互的，刚好系统提供了相关的代码，那么就方便多了。
示例基于FreeRTOS-Kernel-9.0.0.zip，在此之前需要把系统移植完毕。

移植FreeRTOS-Plus-CLI需要干好几件事

• 串口初始化
• 串口终端服务函数
• mian添加初始化
• 添加自己定制的命令

下面讲添加哪些文件
新建一个分组，放CLI相关代码

添加如下文件

下面讲改动哪些文件

• 串口初始化，将图片所示位置注释掉，换成自己GD32F303标准库代码，使用中断，未使用DMA
  

串口初始化

void UART1_Init(unsigned int baudrate)
{
    /* enable GPIO clock */
    rcu_periph_clock_enable(RCU_GPIOD);

    /* enable USART clock */
    rcu_periph_clock_enable(RCU_USART1);
	
	rcu_periph_clock_enable(RCU_AF);
	
	gpio_pin_remap_config(GPIO_USART1_REMAP,ENABLE);

    /* connect port to USARTx_Tx */
    gpio_init(GPIOD, GPIO_MODE_AF_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_5);

    /* connect port to USARTx_Rx */
    gpio_init(GPIOD, GPIO_MODE_IN_FLOATING, GPIO_OSPEED_50MHZ, GPIO_PIN_6);

    /* USART configure */
    usart_deinit(USART1);
    usart_baudrate_set(USART1, baudrate);
    usart_word_length_set(USART1, USART_WL_8BIT);      //设置数据位
	usart_parity_config(USART1, USART_PM_NONE);        //设置奇偶校验位
    usart_hardware_flow_rts_config(USART1, USART_RTS_DISABLE); 
	usart_hardware_flow_cts_config(USART1, USART_CTS_DISABLE); //无硬件数据流控制
    usart_receive_config(USART1, USART_RECEIVE_ENABLE);
    usart_transmit_config(USART1, USART_TRANSMIT_ENABLE);
    
    nvic_priority_group_set(NVIC_PRIGROUP_PRE4_SUB0);

    nvic_irq_enable(USART1_IRQn, 15, 0);//配置NVIC分组，初始化NVIC分组4
	usart_interrupt_enable(USART1, USART_INT_RBNE);//使能接收中断

    
    usart_enable(USART1);
    

}

这里需要特别注意！！nvic_priority_group_set(NVIC_PRIGROUP_PRE4_SUB0);关于这里，请看FreeRTOS串口中断优先级设置

• 更改中断服务函数，这里需要将serial.c中所有关于串口的函数改为GD32标准库函数

中断服务函数

void USART1_IRQHandler( void )// vUARTInterruptHandler( void )
{
portBASE_TYPE xHigherPriorityTaskWoken = pdFALSE;
char cChar;

	if( usart_interrupt_flag_get( USART1, USART_INT_FLAG_TBE ) == SET )
	{
		/* The interrupt was caused by the THR becoming empty.  Are there any
		more characters to transmit? */
		if( xQueueReceiveFromISR( xCharsForTx, &cChar, &xHigherPriorityTaskWoken ) == pdTRUE )
		{
			/* A character was retrieved from the queue so can be sent to the
			THR now. */
			usart_data_transmit( USART1, cChar );
            while(RESET == usart_flag_get(USART1, USART_FLAG_TBE));
		}
		else
		{
			usart_interrupt_disable( USART1, USART_INT_TBE );		
		}		
	}
	
	if( usart_interrupt_flag_get( USART1, USART_INT_FLAG_RBNE ) == SET )
	{
		cChar = usart_data_receive( USART1 );

		xQueueSendFromISR( xRxedChars, &cChar, &xHigherPriorityTaskWoken );
	}	
	
	portEND_SWITCHING_ISR( xHigherPriorityTaskWoken );
}

• mn添加初始化，下面代码一定要在启动调度，开始执行任务前 vTaskStartScheduler();

main添加初始化

	vRegisterSampleCLICommands();
	vUARTCommandConsoleStart( 512, 1 );

• 添加自己定制的命令，添加一个kuawo的命令，输入kuawo，系统会回复一个大帅哥
  

定制的命令

static const CLI_Command_Definition_t xKuaWo =
{
	"kuawo", /* The command string to type. */
	"\r\nkuawo:\r\n can kua kua ni\r\n",
	prvKuaWoCommand, /* The function to run. */
	0 /* No parameters are expected. */
};

static BaseType_t prvKuaWoCommand( char *pcWriteBuffer, size_t xWriteBufferLen, const char *pcCommandString )
{
    
    ( void ) pcCommandString;
    ( void ) xWriteBufferLen;
    configASSERT( pcWriteBuffer );

    sprintf( pcWriteBuffer, "you are  da shuai ge\r\n");

	/* There is no more data to return after this single string, so return
	pdFALSE. */
	return pdFALSE;
}

看看实际上效果，输入help，出现kuawo命令，手动输入kuawo，出现你是一个大帅哥，搞定