222 lines
6.7 KiB
C
222 lines
6.7 KiB
C
/*
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* FreeModbus Libary: RT-Thread 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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#include "rtdevice.h"
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#include "board.h"
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/* ----------------------- Static variables ---------------------------------*/
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ALIGN(RT_ALIGN_SIZE)
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/* software simulation serial transmit IRQ handler thread stack */
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static rt_uint8_t serial_soft_trans_irq_stack[512];
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/* software simulation serial transmit IRQ handler thread */
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static struct rt_thread thread_serial_soft_trans_irq;
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/* serial event */
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static struct rt_event event_serial;
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/* modbus slave serial device */
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static rt_serial_t *serial;
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/* ----------------------- Defines ------------------------------------------*/
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/* serial transmit event */
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#define EVENT_SERIAL_TRANS_START (1<<0)
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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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static rt_err_t serial_rx_ind(rt_device_t dev, rt_size_t size);
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static void serial_soft_trans_irq(void* parameter);
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/* ----------------------- Start implementation -----------------------------*/
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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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/**
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* set 485 mode receive and transmit control IO
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* @note MODBUS_SLAVE_RT_CONTROL_PIN_INDEX need be defined by user
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*/
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rt_pin_mode(MODBUS_SLAVE_RT_CONTROL_PIN_INDEX, PIN_MODE_OUTPUT);
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/* set serial name */
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if (ucPORT == 1) {
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#if defined(RT_USING_UART1) || defined(RT_USING_REMAP_UART1)
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extern struct rt_serial_device serial1;
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serial = &serial1;
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#endif
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} else if (ucPORT == 2) {
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#if defined(RT_USING_UART2)
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extern struct rt_serial_device serial2;
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serial = &serial2;
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#endif
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} else if (ucPORT == 3) {
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#if defined(RT_USING_UART3)
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extern struct rt_serial_device serial3;
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serial = &serial3;
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#endif
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}
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/* set serial configure parameter */
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serial->config.baud_rate = ulBaudRate;
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serial->config.stop_bits = STOP_BITS_1;
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switch(eParity){
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case MB_PAR_NONE: {
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serial->config.data_bits = DATA_BITS_8;
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serial->config.parity = PARITY_NONE;
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break;
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}
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case MB_PAR_ODD: {
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serial->config.data_bits = DATA_BITS_9;
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serial->config.parity = PARITY_ODD;
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break;
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}
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case MB_PAR_EVEN: {
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serial->config.data_bits = DATA_BITS_9;
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serial->config.parity = PARITY_EVEN;
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break;
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}
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}
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/* set serial configure */
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serial->ops->configure(serial, &(serial->config));
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/* open serial device */
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if (!rt_device_open(&serial->parent, RT_DEVICE_OFLAG_RDWR | RT_DEVICE_FLAG_INT_RX)) {
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rt_device_set_rx_indicate(&serial->parent, serial_rx_ind);
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} else {
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return FALSE;
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}
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/* software initialize */
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rt_event_init(&event_serial, "slave event", RT_IPC_FLAG_PRIO);
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rt_thread_init(&thread_serial_soft_trans_irq,
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"slave trans",
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serial_soft_trans_irq,
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RT_NULL,
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serial_soft_trans_irq_stack,
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sizeof(serial_soft_trans_irq_stack),
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10, 5);
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rt_thread_startup(&thread_serial_soft_trans_irq);
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return TRUE;
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}
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void vMBPortSerialEnable(BOOL xRxEnable, BOOL xTxEnable)
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{
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rt_uint32_t recved_event;
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if (xRxEnable)
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{
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/* enable RX interrupt */
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serial->ops->control(serial, RT_DEVICE_CTRL_SET_INT, (void *)RT_DEVICE_FLAG_INT_RX);
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/* switch 485 to receive mode */
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rt_pin_write(MODBUS_SLAVE_RT_CONTROL_PIN_INDEX, PIN_LOW);
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}
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else
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{
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/* switch 485 to transmit mode */
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rt_pin_write(MODBUS_SLAVE_RT_CONTROL_PIN_INDEX, PIN_HIGH);
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/* disable RX interrupt */
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serial->ops->control(serial, RT_DEVICE_CTRL_CLR_INT, (void *)RT_DEVICE_FLAG_INT_RX);
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}
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if (xTxEnable)
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{
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/* start serial transmit */
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rt_event_send(&event_serial, EVENT_SERIAL_TRANS_START);
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}
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else
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{
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/* stop serial transmit */
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rt_event_recv(&event_serial, EVENT_SERIAL_TRANS_START,
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RT_EVENT_FLAG_OR | RT_EVENT_FLAG_CLEAR, 0,
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&recved_event);
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}
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}
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void vMBPortClose(void)
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{
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serial->parent.close(&(serial->parent));
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}
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BOOL xMBPortSerialPutByte(CHAR ucByte)
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{
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serial->parent.write(&(serial->parent), 0, &ucByte, 1);
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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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serial->parent.read(&(serial->parent), 0, pucByte, 1);
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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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* Software simulation serial transmit IRQ handler.
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*
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* @param parameter parameter
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*/
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static void serial_soft_trans_irq(void* parameter) {
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rt_uint32_t recved_event;
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while (1)
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{
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/* waiting for serial transmit start */
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rt_event_recv(&event_serial, EVENT_SERIAL_TRANS_START, RT_EVENT_FLAG_OR,
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RT_WAITING_FOREVER, &recved_event);
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/* execute modbus callback */
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prvvUARTTxReadyISR();
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}
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}
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/**
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* This function is serial receive callback function
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*
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* @param dev the device of serial
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* @param size the data size that receive
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*
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* @return return RT_EOK
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*/
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static rt_err_t serial_rx_ind(rt_device_t dev, rt_size_t size) {
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prvvUARTRxISR();
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return RT_EOK;
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}
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