📄 ppp.c
字号:
** 日 期:
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
uint8 PPPDriverGetFrame(uint8 *Fram, uint16 NByte)
{
uint16 FramType;
uint8 rt;
Fram[NByte - 3] = ~Fram[NByte - 3];
Fram[NByte - 2] = ~Fram[NByte - 2];
rt = PPP_EVENT_NONE;
if (PPPFcs16(PPP_INIT_FCS16, Fram + 1, NByte - 2) == 0)
{
Fram += 3;
FramType = (*Fram) * 256 + Fram[1];
if (FramType == PPP_FRAM_TYPE__LPC)
{
rt = LCPReviceFram(Fram);
if (rt == PPP_EVENT_RXJ_C)
{
Fram -= 2;
Fram[0] = NByte / 256;
Fram[1] = NByte % 256;
}
}
else
{
rt = PPP_EVENT_UP_LAYER;
}
}
return rt;
}
/*********************************************************************************************************
** 函数名称: PPPReviceTask()
** 功能描述: PPP驱动接收处理任务
** 输 入: 无
** 输 出: 无
** 全局变量:
** 调用模块:
**
** 作 者: 陈明计
** 日 期: 2004年4月23日
**-------------------------------------------------------------------------------------------------------
** 修改人:
** 日 期:
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
void PPPReviceTask(void *Pdata)
{
uint8 *Revice;
uint16 i;
uint8 temp,BufSel;
Pdata = Pdata;
BufSel = 0; /* 接收使用双缓冲，BufSel选择使用的缓冲 */
while (1)
{
if (PPPGetch(PPPData.HardDrive) != PPP_HARD_CHAR)
{
continue;
}
GetHard:
Revice = PPPData.Buf[BufSel];
*Revice++ = PPP_HARD_CHAR;
/* get addr char*/
temp = PPPGetch(PPPData.HardDrive);
if (temp == PPP_DLE_CHAR)
{
temp = PPPGetch(PPPData.HardDrive);
if (temp == PPP_HARD_CHAR)
{
goto GetHard;
}
temp ^= PPP_DLE_XOR_CHAR;
}
if (temp != PPP_ADDR_CHAR)
{
continue;
}
*Revice++ = PPP_ADDR_CHAR;
/* get ctr char */
temp = PPPGetch(PPPData.HardDrive);
if (temp == PPP_DLE_CHAR)
{
temp = PPPGetch(PPPData.HardDrive);
if (temp == PPP_HARD_CHAR)
{
goto GetHard;
}
temp ^= PPP_DLE_XOR_CHAR;
}
if (temp != PPP_CTR_CHAR)
{
continue;
}
*Revice++ = PPP_CTR_CHAR;
i = PPP_DRIVER_BUF_LEN - 3; /* 3:PPP_HARD_CHAR、PPP_ADDR_CHAR、 */
/* PPP_CTR_CHAR3个字节 */
while (i--)
{
temp = PPPGetch(PPPData.HardDrive);
if (temp == PPP_HARD_CHAR)
{
break;
}
if (temp == PPP_DLE_CHAR)
{
temp = PPPGetch(PPPData.HardDrive);
if (temp == PPP_HARD_CHAR)
{
break;
}
temp ^= PPP_DLE_XOR_CHAR;
}
*Revice++ = temp;
}
*Revice = PPP_HARD_CHAR;
i = PPP_DRIVER_BUF_LEN - i;
PPPData.Buf[BufSel][0] = PPPDriverGetFrame(PPPData.Buf[BufSel], i);
OSQPost(PPPData.Event, (void *)PPPData.Buf[BufSel]);
BufSel = (BufSel + 1) & 0x03;
}
}
/*********************************************************************************************************
** 函数名称: PPPDriverTask()
** 功能描述: PPP驱动接收处理任务
** 输 入: 无
** 输 出: 无
** 全局变量:
** 调用模块:
**
** 作 者: 陈明计
** 日 期: 2004年4月23日
**-------------------------------------------------------------------------------------------------------
** 修改人:
** 日 期:
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
void (* PPPActions[MAX_PPP_ACTIONS])(uint8 *DataBuf, uint8 Q)
={PPP_tlu, PPP_tld, PPP_tls, PPP_tlf, PPP_irc, PPP_zrc, PPP_scr, PPP_sca,
// 0 1 2 3 4 5 6 7
PPP_scn, PPP_str, PPP_sta, PPP_scj, PPP_ser, PPP_irc_scr, PPP_irc_scr_sca,
// 8 9 a b c d e
PPP_irc_scr_scn, PPP_irc_str, PPP_irc_sca,PPP_sca_tlu, PPP_irc_tlu,
// f 10 11 12 13
PPP_tld_irc_str, PPP_tld_scr_sca, PPP_tld_scr_scn, PPP_tld_scr,
// 14 15 16 17
PPP_tld_zrc_sta, PPP_UpLayer,PPP_reset};
// 18 19 1a
void PPPDriverTask(void *Pdata)
{
uint8 *DataBuf;
uint16 temp;
uint8 err,Q;
Pdata = Pdata;
PPPData.DelayTime = 0;
while (1)
{
DataBuf = OSQPend(PPPData.Event, PPPData.DelayTime, &err);
switch (err)
{
case OS_NO_ERR:
Q = *DataBuf;
*DataBuf = PPP_HARD_CHAR;
DataBuf += 3;
break;
case OS_TIMEOUT:
if (PPPData.OverTimeSum > 0)
{
PPPData.OverTimeSum--;
}
DataBuf = NULL;
if (PPPData.OverTimeSum > 0)
{
Q = PPP_EVENT_TO_R;
}
else
{
Q = PPP_EVENT_TO_E;
}
break;
default:
Q = MAX_PPP_EVENT;
break;
}
if (Q < MAX_PPP_EVENT)
{
err = PPPStateTransitionTable[Q][PPPData.State];
if (err != PPP_STATE_ERR)
{
temp = PPPActionsTable[Q][PPPData.State];
PPPData.State = err;
if (temp < MAX_PPP_ACTIONS)
{
if (PPPActions[temp] != NULL)
{
PPPActions[temp](DataBuf, Q);
}
}
}
else
{
PPPIllegalEvent(DataBuf, Q);
}
}
else
{
PPPIllegalEvent(DataBuf, Q);
if (PPPData.DelayTime != 0)
{
temp = PPPData.OverTime - OSTimeGet();
if (temp < PPPData.DelayTime)
{
PPPData.DelayTime = temp;
}
}
}
}
}
/*********************************************************************************************************
** 函数名称: PPPFcs16()
** 功能描述: 计算CRC检验字段的值
** 输 入: Fcs :CRC检验的初始值（反码表示）
** cp :计数的数据存储的位置
** Length:计算的字节数
** 输 出: CRC检验值（反码表示）
** 全局变量: FcsTab
** 调用模块: 无
**
** 作 者: 陈明计
** 日 期: 2004年4月23日
**-------------------------------------------------------------------------------------------------------
** 修改人:
** 日 期:
**------------------------------------------------------------------------------------------------------
********************************************************************************************************/
static const uint16 FcsTab[256] = {
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
};
uint16 PPPFcs16(uint16 Fcs, uint8 *cp, int16 Length)
{
while (Length--)
{
Fcs = (Fcs >> 8) ^ FcsTab[(Fcs ^ *cp++) & 0xff];
}
return (Fcs);
}
/*********************************************************************************************************
** End Of File
********************************************************************************************************/
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