Quantum Leaps
Example program for the lwIP TCP/IP stack (library lwip_1_4_0_rc2) and the QP state machine framework (library qp). This program demonstrates use of lwIP in hard real-time applications, in which the TCP/IP stack is used to monitor and configure the embedded device as well as to provide remote user interface (e.g., by means of a web browser). In particular, the lwIP stack, which is not reentrant, is strictly encapsulated inside a dedicated QP state machine object (active object in QP), so interrupt locking around calls to lwIP is unnecessary. Also, the Ethernet interrupt service routine (ISR) runs very fast without performing any lengthy copy operations. All this means that hard-real-time processing can be done at the task level, especially when you use the preemptive QK kernel built into QP for executing your application. No external RTOS component is needed to achieve fully deterministic real-time response of active object tasks prioritized above the lwiP task. The lwIP-QP integration uses exclusively the event-driven lwIP API. The heavyweight Berkeley-like socket API requiring a blocking RTOS and is not used, which results in much better performance of the lwIP stack and less memory consumption. NOTE: This example compiles cleanly, but does not run just yet because the low-level Ethernet driver in the lwIP library needs to be completed. See comments in the lwip_1_4_0_rc2 library for more information.
Diff: dpp.h
- Revision:
- 0:84f3d3d7e5d9
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/dpp.h Sun Mar 27 16:50:21 2011 +0000
@@ -0,0 +1,75 @@
+//////////////////////////////////////////////////////////////////////////////
+// Product: DPP example with lwIP
+// Last Updated for Version: 4.0.03
+// Date of the Last Update: Mar 16, 2009
+//
+// Q u a n t u m L e a P s
+// ---------------------------
+// innovating embedded systems
+//
+// Copyright (C) 2002-2009 Quantum Leaps, LLC. All rights reserved.
+//
+// This software may be distributed and modified under the terms of the GNU
+// General Public License version 2 (GPL) as published by the Free Software
+// Foundation and appearing in the file GPL.TXT included in the packaging of
+// this file. Please note that GPL Section 2[b] requires that all works based
+// on this software must also be made publicly available under the terms of
+// the GPL ("Copyleft").
+//
+// Alternatively, this software may be distributed and modified under the
+// terms of Quantum Leaps commercial licenses, which expressly supersede
+// the GPL and are specifically designed for licensees interested in
+// retaining the proprietary status of their code.
+//
+// Contact information:
+// Quantum Leaps Web site: http://www.quantum-leaps.com
+// e-mail: info@quantum-leaps.com
+//////////////////////////////////////////////////////////////////////////////
+#ifndef dpp_h
+#define dpp_h
+
+enum DPPSignals {
+ EAT_SIG = Q_USER_SIG, // published by Table to let a philosopher eat
+ DONE_SIG, // published by Philosopher when done eating
+ BTN_DOWN_SIG, // published by ISR_SysTick when user button is pressed
+ BTN_UP_SIG, // published by ISR_SysTick when user button is released
+
+ DISPLAY_IPADDR_SIG, // published by lwIPMgr to display IP addres
+ DISPLAY_CGI_SIG, // published by lwIPMgr to display CGI text
+ DISPLAY_UDP_SIG, // published by lwIPMgr to display UDP text
+ TERMINATE_SIG, // published by BSP to terminate the application
+ MAX_PUB_SIG, // the last published signal
+
+ HUNGRY_SIG, // posted direclty to Table from hungry Philosopher
+ SEND_UDP_SIG, // posted directly to lwIPMgr to send text via UDP
+ MAX_SIG // the last signal
+};
+
+struct TableEvt : public QEvent {
+ uint8_t philoNum; // philosopher number
+};
+
+#define MAX_TEXT_LEN 16
+struct TextEvt : public QEvent {
+ char text[MAX_TEXT_LEN]; // text to deliver
+};
+
+ // number of philosophers
+#define N_PHILO 5
+
+extern QActive * const AO_Philo[N_PHILO]; // "opaque" pointers to Philo AO
+extern QActive * const AO_Table; // "opaque" pointer to Table AO
+extern QActive * const AO_LwIPMgr; // "opaque" pointer to LwIPMgr AO
+
+#ifdef Q_SPY
+ enum AppRecords { // application-specific trace records
+ PHILO_STAT = QS_USER, // traced by Philo to display status
+ LWIP_SLOW_TICK, // traced by lwIPMgr for each slow tick
+ LWIP_IPADDR, // traced by lwIPMgr to display IP addres
+ LWIP_CGI, // traced by lwIPMgr to display CGI text
+ LWIP_RECV_UDP, // traced by lwIPMgr when receiving UDP
+ LWIP_SEND_UDP, // traced by lwIPMgr when sending UDP
+ };
+#endif
+
+#endif // dpp_h