144 lines
3.3 KiB
C
144 lines
3.3 KiB
C
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/*
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* File : portserial.c
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* This file is part of freemodbus in RT-Thread RTOS
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* COPYRIGHT (C) 2006 - 2009, RT-Thread Development Team
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rt-thread.org/license/LICENSE
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*
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* Change Logs:
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* Date Author Notes
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* 2010-04-04 yi.qiu first version
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*/
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#include <rtthread.h>
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#include "port.h"
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#include "serial.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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#define UART1 ((struct uartport *)U1BASE)
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/* ----------------------- static functions ---------------------------------*/
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static void rt_serial1_handler(int vector);
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static void prvvUARTTxReadyISR(void);
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static void prvvUARTRxISR(void);
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extern rt_uint32_t PCLK;
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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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INTSUBMSK &= ~(BIT_SUB_RXD1);
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}
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else
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{
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INTSUBMSK |= (BIT_SUB_RXD1);
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}
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if( xTxEnable )
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{
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INTSUBMSK &= ~(BIT_SUB_TXD1);
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prvvUARTTxReadyISR();
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}
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else
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{
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INTSUBMSK |= (BIT_SUB_TXD1);
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}
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}
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void vMBPortClose( void )
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{
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/* null */
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}
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BOOL xMBPortSerialInit( UCHAR ucPORT, ULONG ulBaudRate, UCHAR ucDataBits, eMBParity eParity )
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{
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int i;
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/* FIFO enable, Tx/Rx FIFO clear */
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UART1->ufcon = 0x0;
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/* disable the flow control */
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UART1->umcon = 0x0;
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/* Normal,No parity,1 stop,8 bit */
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UART1->ulcon = 0x3;
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/*
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* tx=level,rx=edge,disable timeout int.,enable rx error int.
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* normal,interrupt or polling
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*/
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UART1->ucon = 0x245;
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/* Set uart0 bps */
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UART1->ubrd = (rt_int32_t)(PCLK / (ulBaudRate * 16)) - 1;
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for (i = 0; i < 100; i++);
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SUBSRCPND |= BIT_SUB_RXD1;
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SUBSRCPND |= BIT_SUB_TXD1;
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rt_hw_interrupt_install(INTUART1, rt_serial1_handler, RT_NULL);
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rt_hw_interrupt_umask(INTUART1);
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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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/* wait for room in the transmit FIFO */
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while(!(USTAT1 & USTAT_TXB_EMPTY));
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UTXH1 = (UCHAR)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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while ((USTAT1 & USTAT_RCV_READY) == 0);
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*pucByte = URXB1;
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return TRUE;
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}
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static void rt_serial1_handler(int vector)
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{
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if (SUBSRCPND & BIT_SUB_RXD1)
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{
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SUBSRCPND |= BIT_SUB_RXD1;
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prvvUARTRxISR();
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}
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if (SUBSRCPND & BIT_SUB_TXD1)
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{
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SUBSRCPND |= BIT_SUB_TXD1;
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prvvUARTTxReadyISR();
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}
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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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static 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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static void prvvUARTRxISR( void )
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{
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pxMBFrameCBByteReceived( );
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}
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