修复modbus 01 02 功能码长度计算bug

SConscript

@@ -8,10 +8,9 @@ cwd = GetCurrentDir()
 src = Glob('src/*.c')
 src += Glob('port_rtos/*.c')
 
-src += Glob('test/*.c')
-
-#if GetDepend(['PKG_USING_SMALL_MODBUS_TEST']):
-
+if GetDepend(['PKG_USING_SMALL_MODBUS_TEST']):
+    src += Glob('test/*.c')
+    
 path = [cwd + '/inc']
 path += [cwd + '/port_rtos']
 

src/small_modbus_base.c

@@ -416,7 +416,7 @@ int modbus_handle_confirm(small_modbus_t *smb,uint8_t *request,uint16_t request_
                     // 计算读取线圈数量
                     data_num = (request[smb->core->len_header+3]<<8)|(request[smb->core->len_header+4]);
                     // 计算字节数
-                    temp = (2 + (data_num / 8) + ((data_num % 8) ? 1 : 0));
+                    temp = ((data_num / 8) + ((data_num % 8) ? 1 : 0));
                     // 计算实际字节数
                     byte_num = (response[smb->core->len_header+1]);
                     if((uint8_t)temp == byte_num)
@@ -790,7 +790,10 @@ int modbus_wait(small_modbus_t *smb,small_modbus_mapping_t * mapping_tab)
     uint8_t *confirm = smb->write_buff;
     uint8_t *request = smb->read_buff;
     rc = modbus_wait_poll(smb,request);
-    rc = modbus_handle_poll(smb,request,rc,mapping_tab);
+		if(rc > 0)
+		{
+				rc = modbus_handle_poll(smb,request,rc,mapping_tab);
+		}
     return rc;
 }