?? net_bsp.c
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/*
*********************************************************************************************************
* uC/TCP-IP
* The Embedded TCP/IP Suite
*
* (c) Copyright 2003-2006; Micrium, Inc.; Weston, FL
*
* All rights reserved. Protected by international copyright laws.
*
* uC/TCP-IP is provided in source form for FREE evaluation, for educational
* use or peaceful research. If you plan on using uC/TCP-IP in a commercial
* product you need to contact Micrium to properly license its use in your
* product. We provide ALL the source code for your convenience and to help
* you experience uC/TCP-IP. The fact that the source code is provided does
* NOT mean that you can use it without paying a licensing fee.
*
* Knowledge of the source code may NOT be used to develop a similar product.
*
* Please help us continue to provide the Embedded community with the finest
* software available. Your honesty is greatly appreciated.
*********************************************************************************************************
*/
/*
*********************************************************************************************************
*
* NETWORK BOARD SUPPORT PACKAGE (BSP) FUNCTIONS
*
* TEMPLATE
*
* Filename : net_bsp.c
* Version : V1.88
* Programmer(s) : ITJ
* Jean-Denis Hatier
*********************************************************************************************************
* Note(s) : (1) To provide the required Board Support Package functionality, insert the appropriate
* board-dependent code to perform the stated actions wherever '$$$$' comments are found.
*
* #### This note MAY be entirely removed for specific board support packages.
*********************************************************************************************************
*/
/*
*********************************************************************************************************
* INCLUDE FILES
*********************************************************************************************************
*/
#include <net.h>
#include <includes.h>
/*$PAGE*/
/*
*********************************************************************************************************
*********************************************************************************************************
* NETWORK INTERFACE CARD FUNCTIONS
*********************************************************************************************************
*********************************************************************************************************
*/
/*
*********************************************************************************************************
* NetNIC_LinkUp()
*
* Description : Message from NIC that the ethernet link is up.
*
* Argument(s) : None.
*
* Return(s) : None.
*
* Caller(s) : None.
*
* Note(s) : WARNING: Called in interruption context most of the time.
*********************************************************************************************************
*/
void NetNIC_LinkUp (void)
{
#if (APP_TRACE_LEVEL >= TRACE_LEVEL_INFO)
CPU_INT32U reg_val;
CPU_BOOLEAN speed_100;
CPU_BOOLEAN duplex_full;
/* BCM5221 register 0x01: Status Register */
/* BIT 14: 100 Mbps - Full-duplex */
/* BIT 13: 100 Mbps - Half-duplex */
/* BIT 12: 10 Mbps - Full-duplex */
/* BIT 11: 10 Mbps - Half-duplex */
reg_val = NetNIC_PhyRegRd(0, 0x01, 0);
speed_100 = ((reg_val & (DEF_BIT_13 | DEF_BIT_14)) != 0);
duplex_full = ((reg_val & (DEF_BIT_12 | DEF_BIT_14)) != 0);
APP_TRACE_INFO(("Ethernet link established at %s Mbps, %s-duplex.\n",
speed_100 ? "100" : "10", duplex_full ? "full" : "half"));
#endif
}
/*
*********************************************************************************************************
* NetNIC_LinkDown()
*
* Description : Message from NIC that the ethernet link is down.
*
* Argument(s) : None.
*
* Return(s) : None.
*
* Caller(s) : None.
*
* Note(s) : WARNING: Called in interruption context most of the time.
*********************************************************************************************************
*/
void NetNIC_LinkDown (void)
{
#if (APP_TRACE_LEVEL >= TRACE_LEVEL_INFO)
static CPU_BOOLEAN false_signal = DEF_TRUE;
if (false_signal == DEF_TRUE) {
false_signal = DEF_FALSE;
} else {
APP_TRACE_INFO(("Ethernet link lost.\n"));
}
#endif
}
/*
*********************************************************************************************************
* BCM5221_DlyReset()
*
* Description : Implement a 50 ms delay after reset to allow the chip to stabilize.
*
* Argument(s) : None.
*
* Return(s) : None.
*
* Caller(s) : None.
*
* Note(s) : None.
*********************************************************************************************************
*/
void BCM5221_DlyReset (void)
{
CPU_INT16U ticks;
ticks = OS_TICKS_PER_SEC / 20;
OSTimeDly(ticks);
}
/*
*********************************************************************************************************
* BCM5221_DlyAutoNegAck()
*
* Description : Implement a 1.5 second delay after auto-negotiation initiation.
*
* Argument(s) : None.
*
* Return(s) : None.
*
* Caller(s) : None.
*
* Note(s) : None.
*********************************************************************************************************
*/
void BCM5221_DlyAutoNegAck (void)
{
CPU_INT16U ticks;
ticks = OS_TICKS_PER_SEC + (OS_TICKS_PER_SEC / 2);
OSTimeDly(ticks);
}
/*
*********************************************************************************************************
* AT91RM9200_EMAC_PhyRegDly()
*
* Description : Implement a brief delay before and after accessing PHY registers.
*
* Argument(s) : None.
*
* Return(s) : None.
*
* Caller(s) : Various.
*
* Note(s) : None.
*********************************************************************************************************
*/
void AT91RM9200_EMAC_PhyRegDly (void)
{
CPU_INT16U i;
volatile CPU_INT16U a;
for (i = 0; i < 10000; i++) {
a = i;
}
}
/*$PAGE*/
/*
*********************************************************************************************************
*********************************************************************************************************
* NETWORK MODULE FUNCTIONS
*********************************************************************************************************
*********************************************************************************************************
*/
/*
*********************************************************************************************************
* NetUtil_TS_Get()
*
* Description : Get current Internet Timestamp.
*
* (1) "The Timestamp is a right-justified, 32-bit timestamp in milliseconds since midnight
* UT [Universal Time]" (RFC #791, Section 3.1 'Options : Internet Timestamp').
*
* (2) The developer is responsible for providing a real-time clock with correct time-zone
* configuration to implement the Internet Timestamp.
*
*
* Argument(s) : None.
*
* Return(s) : Internet Timestamp.
*
* Caller(s) : Various.
*
* This function is an INTERNAL network protocol suite function but MAY be called by
* application function(s).
*
* Note(s) : None.
*********************************************************************************************************
*/
NET_TS NetUtil_TS_Get (void)
{
NET_TS ts;
/* $$$$ Insert code to return Internet Timestamp (see Notes #1 & #2). */
ts = NET_TS_NONE;
return (ts);
}
/*$PAGE*/
/*
*********************************************************************************************************
*********************************************************************************************************
* TRANSMISSION CONTROL PROTOCOL LAYER FUNCTIONS
*********************************************************************************************************
*********************************************************************************************************
*/
/*
*********************************************************************************************************
* NetTCP_InitTxSeqNbr()
*
* Description : Initialize the TCP Transmit Initial Sequence Counter, 'NetTCP_TxSeqNbrCtr'.
*
* (1) Possible initialization methods include :
*
* (a) Time-based initialization is one preferred method since it more appropriately
* provides a pseudo-random initial sequence number.
*
* (b) Hardware-generated random number initialization is NOT a preferred method since it
* tends to produce a discrete set of pseudo-random initial sequence numbers--often
* the same initial sequence number.
*
* (c) Hard-coded initial sequence number is NOT a preferred method since it is NOT random.
*
* See also 'net_tcp.h NET_TCP_TX_GET_SEQ_NBR() Note #1'.
*
*
* Argument(s) : None.
*
* Return(s) : None.
*
* Caller(s) : NetTCP_Init().
*
* This function is an INTERNAL network protocol suite function & SHOULD NOT be called by
* application function(s).
*
* Note(s) : None.
*********************************************************************************************************
*/
#ifdef NET_TCP_MODULE_PRESENT
void NetTCP_InitTxSeqNbr (void)
{
/* $$$$ Insert code to initialize TCP Transmit Initial Sequence Counter (see Note #1). */
NetTCP_TxSeqNbrCtr = NET_TCP_SEQ_NBR_NONE;
}
#endif
/*$PAGE*/
/*
*********************************************************************************************************
* NetTCP_TxConnRTT_GetTS_ms()
*
* Description : Get a TCP Round-Trip Time (RTT) timestamp.
*
* (1) (a) (1) Although RFC #2988, Section 4 states that "there is no requirement for the
* clock granularity G used for computing RTT measurements ... experience has
* shown that finer clock granularities (<= 100 msec) perform somewhat better
* than more coarse granularities".
*
* (2) (A) RFC #2988, Section 2.4 states that "whenever RTO is computed, if it is
* less than 1 second then the RTO SHOULD be rounded up to 1 second".
*
* (B) RFC #1122, Section 4.2.3.1 states that "the recommended ... RTO ... upper
* bound should be 2*MSL" where RFC #793, Section 3.3 'Sequence Numbers :
* Knowing When to Keep Quiet' states that "the Maximum Segment Lifetime
* (MSL) is ... to be 2 minutes".
*
* Therefore, the required upper bound is :
*
* 2 * MSL = 2 * 2 minutes = 4 minutes = 240 seconds
*
* (b) Therefore, the developer is responsible for providing a timestamp clock with
* adequate resolution to satisfy the clock granularity (see Note #1a1) & adequate
* range to satisfy the minimum/maximum RTO values (see Note #1a2).
*
*
* Argument(s) : None.
*
* Return(s) : TCP RTT timestamp, in milliseconds.
*
* Caller(s) : NetTCP_RxPktValidate(),
* NetTCP_TxPktPrepareHdr().
*
* This function is an INTERNAL network protocol suite function & SHOULD NOT be called by
* application function(s).
*
* Note(s) : (2) (a) To avoid timestamp calculation overflow, a maximum clock tick threshold value
* MUST be configured to truncate all clock tick values.
*
* (b) Also, since the clock tick integer will periodically overflow; the maximum
* threshold MUST be a multiple of the clock tick to avoid a discontinuity in
* the timestamp calculation when the clock tick integer overflows.
*********************************************************************************************************
*/
#ifdef NET_TCP_MODULE_PRESENT
NET_TCP_TX_RTT_TS_MS NetTCP_TxConnRTT_GetTS_ms (void)
{
#if (CPU_CFG_CRITICAL_METHOD == CPU_CRITICAL_METHOD_STATUS_LOCAL)
CPU_SR cpu_sr;
#endif
NET_TCP_TX_RTT_TS_MS rtt_ts_ms;
CPU_INT32U clk_tick;
CPU_INT32U clk_tick_th;
CPU_CRITICAL_ENTER();
clk_tick = OSTime;
CPU_CRITICAL_EXIT();
if (OS_TICKS_PER_SEC > 0) {
clk_tick_th = (NET_TCP_TX_RTT_TS_MAX / /* MUST cfg clk tick th ... */
DEF_TIME_NBR_mS_PER_SEC); /* ... as multiple of max ts (see Note #2b). */
clk_tick %= clk_tick_th; /* Truncate clk ticks to avoid ovf (see Note #2a). */
rtt_ts_ms = (NET_TCP_TX_RTT_TS_MS)((clk_tick * DEF_TIME_NBR_mS_PER_SEC) / OS_TICKS_PER_SEC);
} else {
rtt_ts_ms = (NET_TCP_TX_RTT_TS_MS)clk_tick;
}
return (rtt_ts_ms);
}
#endif
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