SmartPDCode/control/bootloader/app_demo/Modbus/BARE/port/portserial.c

/*
 * FreeModbus Libary: BARE Port
 * Copyright (C) 2006 Christian Walter <wolti@sil.at>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 *
 * File: $Id$
 */

#include "port.h"

/* ----------------------- Modbus includes ----------------------------------*/
#include "mb.h"
#include "mbport.h"
#include "gd32e23x_usart.h"
#include "gd32e23x_gpio.h"
#include "gd32e23x_rcu.h"
#include "gd32e23x_misc.h"
#include "gd32e23x_it.h"
/* ----------------------- static functions ---------------------------------*/
static void prvvUARTTxReadyISR( void );
static void prvvUARTRxISR( void );

/* ----------------------- Start implementation -----------------------------*/
void
vMBPortSerialEnable( BOOL xRxEnable, BOOL xTxEnable )
{
    /* If xRXEnable enable serial receive interrupts. If xTxENable enable
     * transmitter empty interrupts.
     */
	  if(TRUE == xRxEnable)
    {
        usart_interrupt_enable(USART0,USART_INT_RBNE);//使能接收中断
				gpio_bit_reset(GPIOA, GPIO_PIN_11);						//接收
    }
    else
    {
        usart_interrupt_disable(USART0,USART_INT_RBNE);//失能接收中断
				gpio_bit_set(GPIOA, GPIO_PIN_11);							 //恢复发送
    }
    
		if(TRUE == xTxEnable)
    {	
        usart_interrupt_enable(USART0,USART_INT_TC);	//使能发送中断
				gpio_bit_set(GPIOA, GPIO_PIN_11);            	//发送
    }
    else
    {
				usart_interrupt_disable(USART0,USART_INT_TC);		//使能发送完成中断
				gpio_bit_reset(GPIOA, GPIO_PIN_11);            	//发送
    }
}

BOOL
xMBPortSerialInit( UCHAR ucPORT, ULONG ulBaudRate, UCHAR ucDataBits, eMBParity eParity )
{
	
	nvic_irq_enable(USART0_IRQn, 0);     //使能串口中断，设置优先级
  rcu_periph_clock_enable(RCU_GPIOA);  //使能GPIOA时钟

  //配置TX的GPIO 
  gpio_af_set(GPIOA, GPIO_AF_1, GPIO_PIN_9);  //复用PA9
  gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_9);
  gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_10MHZ, GPIO_PIN_9);
  
  //配置RX的GPIO
  gpio_af_set(GPIOA, GPIO_AF_1, GPIO_PIN_10);  //复用PA10
  gpio_mode_set(GPIOA, GPIO_MODE_AF, GPIO_PUPD_PULLUP, GPIO_PIN_10);
  gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_10MHZ, GPIO_PIN_10);
	
	//配置TX_RX的切换
  gpio_mode_set(GPIOA, GPIO_MODE_OUTPUT, GPIO_PUPD_NONE, GPIO_PIN_11);           //设置GPIO模式
  gpio_output_options_set(GPIOA, GPIO_OTYPE_PP, GPIO_OSPEED_50MHZ, GPIO_PIN_11); //设置GPIO输出模式及速度
	
	gpio_bit_reset(GPIOA, GPIO_PIN_11);		

  //配置USART的参数
  rcu_periph_clock_enable(RCU_USART0);                  //使能串口时钟
  usart_deinit(USART0);                                 //RCU配置恢复默认值
  usart_baudrate_set(USART0, ulBaudRate);               //设置波特率
	
  usart_stop_bit_set(USART0,USART_STB_1BIT);            //设置停止位
  usart_word_length_set(USART0,USART_WL_8BIT);          //设置数据字长度
  usart_parity_config(USART0,USART_PM_NONE);            //设置奇偶校验位

	
  usart_receive_config(USART0, USART_RECEIVE_ENABLE);   //使能接收
  usart_transmit_config(USART0, USART_TRANSMIT_ENABLE); //使能发送
  usart_enable(USART0);                                 //使能串口
 
 
 
	return TRUE;	
	//return FALSE;
}


BOOL
xMBPortSerialPutByte( CHAR ucByte )
{
    /* Put a byte in the UARTs transmit buffer. This function is called
     * by the protocol stack if pxMBFrameCBTransmitterEmpty( ) has been
     * called. */
		usart_data_transmit(USART0,ucByte);
    return TRUE;
}

BOOL
xMBPortSerialGetByte( CHAR * pucByte )
{
    /* Return the byte in the UARTs receive buffer. This function is called
     * by the protocol stack after pxMBFrameCBByteReceived( ) has been called.
     */
		*pucByte = usart_data_receive(USART0);
    return TRUE;
}
void USART0_IRQHandler(void)            
{
  if(usart_interrupt_flag_get(USART0, USART_INT_FLAG_RBNE) != RESET)  //接收缓冲区非空中断
  {         
		prvvUARTRxISR();		
    usart_interrupt_flag_clear(USART0, USART_INT_FLAG_RBNE);  //清除USART1中断挂起                                                                                     
  }                                                         
                                                            
  if(usart_flag_get(USART0, USART_FLAG_ORERR) == SET) //溢出错误标志为1
  {                                                         
    usart_flag_clear(USART0, USART_FLAG_ORERR);       //清除溢出错误标志
     prvvUARTRxISR();
  }                                                                                                           
	if(usart_interrupt_flag_get(USART0, USART_INT_FLAG_TBE)!= RESET)  //发送缓冲区空中断
  {     
		prvvUARTTxReadyISR();		
    usart_interrupt_flag_clear(USART0, USART_INT_FLAG_TBE);        //清除发送中断标志
  }
	if(usart_interrupt_flag_get(USART0, USART_INT_FLAG_TC)!= RESET)  //发送完成中断
  {     	
    prvvUARTTxReadyISR();
		usart_interrupt_flag_clear(USART0, USART_INT_FLAG_TC);         //清除发送完成中断   
//		gpio_bit_reset(GPIOA, GPIO_PIN_8);														 //接收		
  }
} 
/* Create an interrupt handler for the transmit buffer empty interrupt
 * (or an equivalent) for your target processor. This function should then
 * call pxMBFrameCBTransmitterEmpty( ) which tells the protocol stack that
 * a new character can be sent. The protocol stack will then call 
 * xMBPortSerialPutByte( ) to send the character.
 */
static void prvvUARTTxReadyISR( void )
{
    pxMBFrameCBTransmitterEmpty(  );
}

/* Create an interrupt handler for the receive interrupt for your target
 * processor. This function should then call pxMBFrameCBByteReceived( ). The
 * protocol stack will then call xMBPortSerialGetByte( ) to retrieve the
 * character.
 */
static void prvvUARTRxISR( void )
{
    pxMBFrameCBByteReceived(  );
}