河北水利局项目

yw/generalyw.c

@@ -0,0 +1,138 @@
+#include "stdafx.h"
+#include "frame.h"
+#include "crc.h"
+
+/*
+帧的通用表达
+*/
+static u16 send_serial = 0;
+static u16 recv_serial = 0;
+
+static u16 get_sendserial()
+{
+  
+	return (send_serial++);
+}
+/*
+static void serialserial_add(u8 * value)
+{
+	send_serial ++;
+	value[0] = send_serial&0xFF;
+	value[1] = (send_serial>>8)&0xFF;
+}
+*/
+static u16 get_recvserial()
+{
+	return recv_serial;
+}
+
+void set_recvserial(u16 serial)
+{
+	recv_serial = serial;
+}
+
+/*
+//0x30 ---> 30
+unsigned char  BCDToHex(unsigned int bcd_data)
+{
+    unsigned char temp;
+	unsigned char tmp1 = bcd_data&0x0f;
+	unsigned char tmp2 = (bcd_data>>4)&0x0f;
+	unsigned char tmp3 = (bcd_data>>8)&0x0f;
+	unsigned char tmp4 = (bcd_data>>12)&0x0f;
+    temp=(tmp4*1000) + (tmp3*100)+(tmp2*10)+tmp1;
+    return temp;
+}
+*/
+
+//30--->0x30
+unsigned int  Hex2BCD(unsigned char hex_data)
+{
+    unsigned int bcd_data;
+    unsigned char temp;
+    temp=hex_data%100;
+    bcd_data=((unsigned int)hex_data)/100<<8;
+    bcd_data=bcd_data|temp/10<<4;
+    bcd_data=bcd_data|temp%10;
+    return bcd_data;
+}
+
+//将u16数字转换成 2个字节。
+void P2From16(unsigned char * P2,unsigned short Val)
+{
+  P2[0] = (Val&0xFF); 
+  P2[1] = ((Val)>>8)&0xFF;
+}
+
+
+/*
+//199  0x99 0x01
+u16 getid_frombcd(u8 * p)
+{
+	return BCDToHex(p[1]) * 100 + BCDToHex(p[0]);
+}
+
+void getbcd_fromid(u8 * p,u16 id)
+{
+	u8 id1 = id%100;
+	u8 id2 = id/100;
+	p[0] = Hex2BCD(id1);
+	p[1] = Hex2BCD(id2);
+}
+*/
+/*
+得到校验和
+*/
+u8 * frame_get_valpos(u8 * val)
+{
+	return &val[6];
+}
+
+void frame_fill_head(u8 * val,u16 len,u8 afn)
+{
+	val[0] = 0x68;
+	val[1] = len&0xFF;
+	val[2] = (len>>8)&0xFF;
+	val[3] = get_sendserial()&0xFF;
+	val[4] = (get_sendserial()>>8)&0xFF;
+	val[5] = afn;
+}
+
+void frame_fill_ack_head(u8 * val,u16 len,u8 afn)
+{
+	val[0] = 0x68;
+	val[1] = len&0xFF;
+	val[2] = (len>>8)&0xFF;
+	val[3] = get_recvserial()&0xFF;
+	val[4] = (get_recvserial()>>8)&0xFF;
+	val[5] = afn;
+}
+
+void frame_fill_end(u8 * val,u16 len)
+{
+	u16 ck = 0;
+	val[1] = len&0xFF;
+	val[2] = (len>>8)&0xFF;
+	ck = get_crc(&val[1],len-4);
+	val[len-3] = ck&0xFF;
+	val[len-2] = (ck>>8)&0xFF;
+	val[len-1] = 0x16;
+}
+
+bool frame_islegal(u8 * val)
+{
+	u16 len = U16From2(&val[1]);
+	u16 ck1 = 0;
+	u16 ck2 = 0;
+	if(0x68 == val[0] && 0x16 == val[len-1])
+	{
+		ck1 = get_crc(&val[1],len-4);
+		ck2 = U16From2(&val[len-3]);
+		if(ck1 == ck2)
+		{
+			return true;
+		}
+	}
+	return false;
+}
+