194 lines
6.0 KiB
C
194 lines
6.0 KiB
C
/*
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* FreeModbus Libary: STM32 Port
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* Copyright (C) 2013 Armink <armink.ztl@gmail.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* File: $Id: portserial.c,v 1.60 2013/08/13 15:07:05 Armink $
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*/
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#include "port.h"
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/* ----------------------- Modbus includes ----------------------------------*/
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#include "mb.h"
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#include "mbport.h"
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/* ----------------------- static functions ---------------------------------*/
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static void prvvUARTTxReadyISR(void);
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static void prvvUARTRxISR(void);
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/* ----------------------- Start implementation -----------------------------*/
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void vMBPortSerialEnable(BOOL xRxEnable, BOOL xTxEnable)
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{
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if (xRxEnable)
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{
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/* 485通信时，等待串口移位寄存器中的数据发送完成后，再去使能485的接收、失能485的发送
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* 该延时时间可以结合CPU主频及串口波特率做适当调整
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* */
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vMBDelay(1000);
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SLAVE_RS485_RECEIVE_MODE;
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USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
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}
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else
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{
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SLAVE_RS485_SEND_MODE;
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USART_ITConfig(USART1, USART_IT_RXNE, DISABLE);
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}
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if (xTxEnable)
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{
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USART_ITConfig(USART1, USART_IT_TXE, ENABLE);
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}
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else
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{
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USART_ITConfig(USART1, USART_IT_TXE, DISABLE);
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}
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}
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void vMBPortClose(void)
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{
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USART_ITConfig(USART1, USART_IT_TXE | USART_IT_RXNE, DISABLE);
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USART_Cmd(USART1, DISABLE);
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}
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//默认一个从机 串口1 波特率可设置 奇偶检验可设置
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BOOL xMBPortSerialInit(UCHAR ucPORT, ULONG ulBaudRate, UCHAR ucDataBits,
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eMBParity eParity)
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{
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GPIO_InitTypeDef GPIO_InitStructure;
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USART_InitTypeDef USART_InitStructure;
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NVIC_InitTypeDef NVIC_InitStructure;
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//======================时钟初始化=======================================
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RCC_APB2PeriphClockCmd(
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RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB | RCC_APB2Periph_USART1,
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ENABLE);
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//======================IO初始化=======================================
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//USART1_TX
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GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
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GPIO_Init(GPIOA, &GPIO_InitStructure);
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//USART1_RX
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
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GPIO_Init(GPIOA, &GPIO_InitStructure);
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//配置485发送和接收模式
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// TODO 暂时先写B13 等之后组网测试时再修改
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GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
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GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13;
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GPIO_Init(GPIOB, &GPIO_InitStructure);
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//======================串口初始化=======================================
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USART_InitStructure.USART_BaudRate = ulBaudRate;
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//设置校验模式
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switch (eParity)
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{
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case MB_PAR_NONE: //无校验
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USART_InitStructure.USART_Parity = USART_Parity_No;
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USART_InitStructure.USART_WordLength = USART_WordLength_8b;
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break;
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case MB_PAR_ODD: //奇校验
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USART_InitStructure.USART_Parity = USART_Parity_Odd;
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USART_InitStructure.USART_WordLength = USART_WordLength_9b;
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break;
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case MB_PAR_EVEN: //偶校验
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USART_InitStructure.USART_Parity = USART_Parity_Even;
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USART_InitStructure.USART_WordLength = USART_WordLength_9b;
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break;
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default:
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return FALSE;
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}
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USART_InitStructure.USART_StopBits = USART_StopBits_1;
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USART_InitStructure.USART_HardwareFlowControl =
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USART_HardwareFlowControl_None;
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USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
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if (ucPORT != 1)
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return FALSE;
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ENTER_CRITICAL_SECTION(); //关全局中断
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USART_Init(USART1, &USART_InitStructure);
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USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
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USART_Cmd(USART1, ENABLE);
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//=====================中断初始化======================================
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//设置NVIC优先级分组为Group2：0-3抢占式优先级，0-3的响应式优先级
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NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
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NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
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NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
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NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
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NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
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NVIC_Init(&NVIC_InitStructure);
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EXIT_CRITICAL_SECTION(); //开全局中断
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return TRUE;
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}
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BOOL xMBPortSerialPutByte(CHAR ucByte)
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{
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USART_SendData(USART1, ucByte);
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return TRUE;
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}
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BOOL xMBPortSerialGetByte(CHAR * pucByte)
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{
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*pucByte = USART_ReceiveData(USART1);
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return TRUE;
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}
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/*
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* Create an interrupt handler for the transmit buffer empty interrupt
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* (or an equivalent) for your target processor. This function should then
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* call pxMBFrameCBTransmitterEmpty( ) which tells the protocol stack that
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* a new character can be sent. The protocol stack will then call
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* xMBPortSerialPutByte( ) to send the character.
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*/
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void prvvUARTTxReadyISR(void)
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{
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pxMBFrameCBTransmitterEmpty();
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}
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/*
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* Create an interrupt handler for the receive interrupt for your target
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* processor. This function should then call pxMBFrameCBByteReceived( ). The
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* protocol stack will then call xMBPortSerialGetByte( ) to retrieve the
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* character.
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*/
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void prvvUARTRxISR(void)
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{
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pxMBFrameCBByteReceived();
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}
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/*******************************************************************************
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* Function Name : USART1_IRQHandler
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* Description : This function handles USART1 global interrupt request.
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* Input : None
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* Output : None
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* Return : None
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*******************************************************************************/
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void USART1_IRQHandler(void)
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{
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rt_interrupt_enter();
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//接收中断
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if (USART_GetITStatus(USART1, USART_IT_RXNE) == SET)
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{
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USART_ClearITPendingBit(USART1, USART_IT_RXNE);
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prvvUARTRxISR();
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}
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//发送中断
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if (USART_GetITStatus(USART1, USART_IT_TXE) == SET)
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{
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prvvUARTTxReadyISR();
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}
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rt_interrupt_leave();
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}
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