📄 uart.cpp
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// NAME: UART.cpp
//--------------------------------------------------------------------------------------------------
//
// GENERAL DESCRIPTION
//
// This module provides the implementation of the interface with serial port.
//--------------------------------------------------------------------------------------------------
//
// Revision History:
// Modification Tracking
// Author Date Number Description of Changes
// ------------------------- ------------ ---------- ----------------------------------------
//
// Portability:
// This module can be portable to other C++ compilers or Win32 platforms.
/*
when who what, where, why
-------- -------- ---------------------------------------------------------------
01/20/05 nony.wu fixed bugs to support baudrate change
============================================================================ */
//--------------------------------------------------------------------------------------------------
// INCLUDE FILES
//--------------------------------------------------------------------------------------------------
#include "stdafx.h"
#include "UART.h"
#include "common.h"
#include "BurnFlash.h"
#ifdef _DEBUG
#undef THIS_FILE
static char THIS_FILE[]=__FILE__;
#define new DEBUG_NEW
#endif
//--------------------------------------------------------------------------------------------------
// LOCAL CONSTANTS
//--------------------------------------------------------------------------------------------------
#define UART_RX_ERR -1
#define UART_RX_OVERTIME -2
#define MIN_PACKET_LEN 3 // 2 bytes CRC + 1 byte command code
// The CRC table size is based on how many bits at a time we are going to process through the table.
// Given that we are processing the data 8 bits at a time, this gives us 2^8 (256) entries.
#define CRC_TAB_SIZE 256 // 2^CRC_TAB_BITS
/* CRC table for 16 bit CRC, with generator polynomial 0x8408,
** calculated 8 bits at a time, LSB first. This table is used
** from a macro in sio.c.
*/
const unsigned short crc_16_l_table[ CRC_TAB_SIZE ] = {
0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf,
0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7,
0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e,
0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876,
0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd,
0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5,
0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c,
0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974,
0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb,
0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3,
0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a,
0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72,
0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9,
0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1,
0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738,
0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70,
0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7,
0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff,
0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036,
0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e,
0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5,
0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd,
0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134,
0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c,
0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3,
0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb,
0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232,
0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a,
0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1,
0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9,
0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330,
0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78
};
/* This flag is true until communications established */
BOOL init_boot = TRUE;
//--------------------------------------------------------------------------------------------------
// GLOBAL VARIABLES
//--------------------------------------------------------------------------------------------------
CUART theComm; //the unique instance for the application
//--------------------------------------------------------------------------------------------------
// CLASS IMPLEMENTATION
//--------------------------------------------------------------------------------------------------
//
// Construction/Destruction
//--------------------------------------------------------------------------------------------------
CUART::CUART()
{
m_bErrByte = FALSE;
}
CUART::~CUART()
{
CloseComm();
}
//--------------------------------------------------------------------------------------------------
//External Member Fucntions
//--------------------------------------------------------------------------------------------------
// FUNCTION:
// CUART::InitComm
// DESCRIPTION:
// This function initialize the current serial port.
// ARGUMENTS PASSED:
// nPort indicate the serial port. It can be COM1 or COM2.
// RETURN VALUE:
// TRUE initialize the serial port successfully;
// FALSE initialize the serial port unsuccessfully;
// PRE-CONDITIONS:
// None
// POST-CONDITIONS:
// The other member functions can be called only if this function is successful.
// IMPORTANT NOTES:
// None
//--------------------------------------------------------------------------------------------------
BOOL
CUART::InitComm(BYTE cPort)
{
m_cPort = cPort;
m_cs.cbInQue = 0;
if(m_cPort == COM2)
m_hCom = CreateFile("COM2",
GENERIC_READ|GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
0,
NULL
);
else if (m_cPort == COM3)
m_hCom = CreateFile("COM3",
GENERIC_READ|GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
0,
NULL
);
else if (m_cPort == COM4)
m_hCom = CreateFile("COM4",
GENERIC_READ|GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
0,
NULL
);
else if (m_cPort == COM5)
m_hCom = CreateFile("COM5",
GENERIC_READ|GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
0,
NULL
);
else if (m_cPort == COM6)
m_hCom = CreateFile("COM6",
GENERIC_READ|GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
0,
NULL
);
else if (m_cPort == COM7)
m_hCom = CreateFile("COM7",
GENERIC_READ|GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
0,
NULL
);
else if (m_cPort == COM8)
m_hCom = CreateFile("COM8",
GENERIC_READ|GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
0,
NULL
);
else if (m_cPort == COM9)
m_hCom = CreateFile("COM9",
GENERIC_READ|GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
0,
NULL
);
else if (m_cPort == COM10)
m_hCom = CreateFile("COM10",
GENERIC_READ|GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
0,
NULL
);
else
m_hCom = CreateFile("COM1",
GENERIC_READ|GENERIC_WRITE,
0,
NULL,
OPEN_EXISTING,
0,
NULL
);
if(m_hCom == INVALID_HANDLE_VALUE)
{
TRACE0("COM port open error!");
return false;
}
DWORD dwErr;
ClearCommError(m_hCom, &dwErr, &m_cs);
COMMCONFIG CC;
GetCommState(m_hCom, &CC.dcb);
extern baudrate;
switch(baudrate)
{
case 0:
CC.dcb.BaudRate = 57600;//this is a special case for flying project
break;
/* case 1:
CC.dcb.BaudRate = 115200;
break;
case 2:
CC.dcb.BaudRate = 230400;
break;
case 4:
CC.dcb.BaudRate = 460800;
break;*/
default:
CC.dcb.BaudRate = 115200;//because phone side initialize uart first to 115200
break;
}
CC.dcb.ByteSize = 8;
CC.dcb.StopBits = 0;
CC.dcb.Parity = 0;
if(!SetCommState(m_hCom, &(CC.dcb)))
{
TRACE("\r\nCOM port Set error,DCB Invalid!\r\n");
return false;
}
COMMTIMEOUTS ctout = {MAXWORD,0,0,5,40};
if(!SetCommTimeouts(m_hCom, &ctout))
{
TRACE0("COM port Set error,TimeOut Invalid!");
return false;
}
return true;
}
//--------------------------------------------------------------------------------------------------
// FUNCTION:
// CUART::CloseComm
// DESCRIPTION:
// This function close the current serial port.
// ARGUMENTS PASSED:
// None
// RETURN VALUE:
// None
// PRE-CONDITIONS:
// The CUART::InitComm function must be called.
// POST-CONDITIONS:
// The other member functions related to the serial port cannot be called if this function is successful.
// IMPORTANT NOTES:
// None
//--------------------------------------------------------------------------------------------------
void
CUART::CloseComm()
{
if(m_hCom != INVALID_HANDLE_VALUE)
{
CloseHandle(m_hCom);
m_hCom = INVALID_HANDLE_VALUE;
}
}
/*===========================================================================
FUNCTION get_next_char
DESCRIPTION
This function receives the next byte using either the generic UART
service uart_receive_byte or USB service dloadusb_receive_byte.
DEPENDENCIES
None.
RETURN VALUE
Word.
SIDE EFFECTS
The watchdog is reset if polling times out.
===========================================================================*/
int
CUART::get_next_char( BYTE cWait )
{
int chr = UART_RX_OVERTIME;
long count = 0;
/* Get the next byte on the interface in use, if the interface (UART or
USB) has yet to be established then check both */
/* loop forever waiting for data */
// for (;;)
// {
chr = ReceiveByte(cWait); /* Get next character */
// if ((chr != UART_RX_ERR) && (chr != UART_RX_OVERTIME))
// {
// break;
// }
/* only loop a limited number of times, ~ 15 seconds, if there is
no active initial communications */
// if ((init_boot == TRUE) && (count++ > 400000))
// {
// chr = UART_RX_OVERTIME;
// break;
// }
// }
return chr;
}
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