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Mbed with Magjack
Wen qian.
20
replies
Hello David,
Yeah...It is nice development kit. Thanks for your sharing. This DevKit have given me some idea, in future i might do a small DevKit for myself. It is quite interesting.
Hello Carl,
Thanks for your reply.
Opp..sorry, typing error. Noted, thanks for your remind, Edited. At this moment i haven't use on board supply.
aaa aaa wrote:
There should be no need for a seperate external 3.3V regulator during testing.
This is what i concern. The Magjack have very low resistance <1 Ohm, i worry it will damage the Mbed. My previous module malfunctioning after power is ON middle LED is not turn ON. Then i measured the LD1117S33 regulator (which is beside the pin-4 to pin-7) Vout just 1.27V only and it slowly getting hot. Because of this i remove the LD1117S33 from the board then i found out the LDO regulator PCB pad Vout and GND is 1.2Ohm. It almost short circuit ya.
By rite we should be no need to separate the 3.3V. At this moment I just try use external supply for my testing and just narrow down the mistake and just focus the Magjack TD+/- and RD+/-.
At this moment i would like to build the hardware by myself and across the embarrass. So that i can learn it. So, in future if i want to build my own development board will be easy.
Carl, may i know which Magjack you are using?
Hello Carl,
Ya, thanks for your link. There is a lot of information there.
This few day i did tried a few testing and once of the testing is "Ethernet Testing" ( http://mbed.org/users/no2chem/notebook/ethernet-testing/ ) tutorial, this tutorial working fine for me. In this coding we need to do some IP configuration and the changes
dhcp_start(netif); < Use DHCP
with
netif_set_up(netif);
I wonder why we need to change it to netif_set_up(netif);. Is it i can't DHCP when my Mbed direct connect to PC?
Another testing i was try is the "NetHttpServerHelloWorld" (http://mbed.org/forum/mbed/topic/139/?page=2#comment-3809) tutorial. In this tutorial i can't get the IP address. The testing result is
On 30 Mar 2010 Donatien have said:
Donatien Garnier wrote:
Since your mbed is directly connected to your computer, you can't use the mbed's DHCP client unless you have installed a DHCP server your computer, so I assume that your mbed can't get attributed an IP address and gets stuck there.
You can either install a DHCP server on your computer (but is it really worth it...?), or program the mbed to use a local address (like 192.168.x.y for instance).
Example when you instanciate your server :
HTTPServer("mbed", IPv4(192,168,0,101));
I have lack of DHCP knowledge. Above message seem like i can't connect mbed directly to PC. What does it mean "...program the mbed to use a local address.."? is it i have to add this line HTTPServer("mbed", IPv4(192,168,0,101)); in the coding? How can i do?
Thank you, Wen.
Hello Andy,
May i know what do you mean contain no tokens?
Following is the whole complete test code. I didn't modified much in the code, just add some coding that you have highlighted.
#include "mbed.h"
#include "lwip/opt.h"
#include "lwip/stats.h"
#include "lwip/sys.h"
#include "lwip/pbuf.h"
#include "lwip/udp.h"
#include "lwip/tcp.h"
#include "lwip/dns.h"
#include "lwip/dhcp.h"
#include "lwip/init.h"
#include "lwip/netif.h"
#include "netif/etharp.h"
#include "netif/loopif.h"
#include "device.h"
Ethernet ethernet;
DigitalOut ledLink(p30);
DigitalOut ledActivity(p29);
DigitalOut ledStage0 (LED1);
DigitalOut ledStage1 (LED2);
DigitalOut ledStage2 (LED3);
DigitalOut ledTCP80 (LED4);
volatile char stage = 0;
Ticker stage_blinker;
struct netif netif_data;
const char testPage[] = "HTTP/1.1 200 OK\r\n"
"Content-Type: text/html\r\n"
"Connection: Close\r\n\r\n"
"<html>"
"<head>"
"<title>mbed test page</title>"
"<style type='text/css'>"
"body{font-family:'Arial, sans-serif', sans-serif;font-size:.8em;background-color:#fff;}"
"</style>"
"</head>"
"<body>%s</body></html>\r\n\r\n";
char buffer[1024];
char temp[1024];
char * location;
char LED_status[7];
err_t recv_callback(void *arg, struct tcp_pcb *pcb, struct pbuf *p, err_t err) {
struct netif *netif = &netif_data;
ledTCP80 = true;
printf("TCP callback from %d.%d.%d.%d\r\n", ip4_addr1(&(pcb->remote_ip)),ip4_addr2(&(pcb->remote_ip)),ip4_addr3(&(pcb->remote_ip)),ip4_addr4(&(pcb->remote_ip)));
char *data;
/* Check if status is ok and data is arrived. */
if (err == ERR_OK && p != NULL) {
/* Inform TCP that we have taken the data. */
tcp_recved(pcb, p->tot_len);
data = static_cast<char *>(p->payload);
/* If the data is a GET request we can handle it. */
if (strncmp(data, "GET ", 4) == 0) {
printf("Handling GET request...\r\n");
printf("Request:\r\n%s\r\n", data);
location = strstr(data,"/?");
if (location != NULL) {
strncpy(LED_status,location+2,7);
printf("LED_status: %s\r\n", LED_status);
location = NULL;
}
//generate the test page
time_t seconds = time(NULL);
sprintf(temp, "<form method=\"get\" name=\"LED\">"
"<form>LED:<input type=\"submit\" name=\"LED\" value=\"ON\">"
"<input type=\"submit\" name=\"LED\" value=\"OFF\"></form><br/>",
ctime(&seconds),
(char*) netif->hwaddr[0],
(char*) netif->hwaddr[1],
(char*) netif->hwaddr[2],
(char*) netif->hwaddr[3],
(char*) netif->hwaddr[4],
(char*) netif->hwaddr[5],
inet_ntoa(*(struct in_addr*)&(netif->ip_addr))
);
sprintf(buffer, testPage, temp);
if (tcp_write(pcb, (void *)buffer, strlen(buffer), 1) == ERR_OK) {
tcp_output(pcb);
printf("Closing connection...\r\n");
tcp_close(pcb);
}
}
else
{
printf("Non GET request...\r\nRequest:\r\n%s\r\n", data);
}
pbuf_free(p);
}
else {
/* No data arrived */
/* That means the client closes the connection and sent us a packet with FIN flag set to 1. */
/* We have to cleanup and destroy out TCPConnection. */
printf("Connection closed by client.\r\n");
pbuf_free(p);
}
/* Don't panic! Everything is fine. */
ledTCP80 = false;
return ERR_OK;
}
/* Accept an incomming call on the registered port */
err_t accept_callback(void *arg, struct tcp_pcb *npcb, err_t err) {
LWIP_UNUSED_ARG(arg);
/* Subscribe a receive callback function */
tcp_recv(npcb, &recv_callback);
/* Don't panic! Everything is fine. */
return ERR_OK;
}
void stageblinker()
{
switch (stage)
{
case 0:
ledStage0 = !ledStage0;
ledStage1 = false;
ledStage2 = false;
break;
case 1:
ledStage0 = true;
ledStage1 = !ledStage1;
ledStage2 = false;
break;
case 2:
ledStage0 = true;
ledStage1 = true;
ledStage2 = true;
stage_blinker.detach();
break;
}
}
int main() {
printf("mBed Ethernet Tester 1.0\r\nStarting Up...\r\n");
stage = 0;
struct netif *netif = &netif_data;
struct ip_addr ipaddr;
struct ip_addr netmask;
struct ip_addr gateway;
Ticker tickFast, tickSlow, tickARP, eth_tick, dns_tick, dhcp_coarse, dhcp_fine;
stage_blinker.attach_us(&stageblinker, 1000*500);
char *hostname = "my-mbed";
printf("Configuring device for DHCP...\r\n");
/* Start Network with DHCP */
IP4_ADDR(&netmask, 255,255,255,255);
IP4_ADDR(&gateway, 0,0,0,0);
IP4_ADDR(&ipaddr, 0,0,0,0);
/* Initialise after configuration */
lwip_init();
netif->hwaddr_len = ETHARP_HWADDR_LEN;
device_address((char *)netif->hwaddr);
netif = netif_add(netif, &ipaddr, &netmask, &gateway, NULL, device_init, ip_input);
netif->hostname = hostname;
netif_set_default(netif);
dhcp_start(netif); // <-- Use DHCP
/* Initialise all needed timers */
tickARP.attach_us( ðarp_tmr, ARP_TMR_INTERVAL * 1000);
tickFast.attach_us(&tcp_fasttmr, TCP_FAST_INTERVAL * 1000);
tickSlow.attach_us(&tcp_slowtmr, TCP_SLOW_INTERVAL * 1000);
dns_tick.attach_us(&dns_tmr, DNS_TMR_INTERVAL * 1000);
dhcp_coarse.attach_us(&dhcp_coarse_tmr, DHCP_COARSE_TIMER_MSECS * 1000);
dhcp_fine.attach_us(&dhcp_fine_tmr, DHCP_FINE_TIMER_MSECS * 1000);
stage = 1;
while (!netif_is_up(netif)) {
ledLink = ethernet.link();
device_poll();
}
/*
while (!(netif->dhcp->state == DHCP_BOUND || netif->dhcp->state == DHCP_PERMANENT))
{
ledLink = ethernet.link();
device_poll();
//printf("Waiting for DHCP response, state = %d\r\n", netif->dhcp->state);
//wait_ms(100);
}
*/
stage = 2;
printf("Interface is up, local IP is %s\r\n",
inet_ntoa(*(struct in_addr*)&(netif->ip_addr)));
printf("Starting Web Server...\r\n");
/* Bind a function to a tcp port */
struct tcp_pcb *pcb = tcp_new();
if (tcp_bind(pcb, IP_ADDR_ANY, 80) == ERR_OK) {
pcb = tcp_listen(pcb);
tcp_accept(pcb, &accept_callback);
}
printf("Waiting for connection...\r\n");
while(1) {
device_poll();
ledLink = ethernet.link();
}
}
Quote:
I can't see testPage in your snippet. It is a global?
To test the program. First we have to open the browser and type in the Mbed IP. After that you will see this button 
on html. When everything we click the button the hyperterminal will show the output message "LED_status: LED=ON" or "LED_status: LED=OFF".
Please correct me if i have mis-understand your question.
Best Regards, Wen
Hello,
Good Evening.
This morning I just received the MBED.
Following is the testing and preparation that i do it in last weekend.
Testing Step:
1) Just now I did test the Hello World sample code using USB power. The LED1 is blinking every 0.5sec. It is working fine. But i realize the module turns ON after 5 min, it starts getting warm on the module pin and the processor.
2) I’m using USB power. Mbed pin-2, pin-39, and pin-40 voltage Measurement:
Vin (pin-2) = 4.76V (I wonder why it have supply?)
Vo (pin-40) = 3.302V
Vu (pin-39) = 4.93V
3) Testing board and schematic includes:
- 5V regulator and 3V3 regulator
- 5V regulator output ready connect to Mbed Vin pin-2
- 3V3 regulator output ready connect to Magjack either PRT-08534(pin-3 and pin-6) / HR911105A (pin-4 and pin-5)
Magjack PRT-08534 datasheet: http://www.sparkfun.com/datasheets/Prototyping/MagJack.pdf
Magjack HR911105A datasheet: http://www.terraelectronica.ru/pdf/HANRUN/HR911105A.pdf
Ethernet RJ45: http://mbed.org/cookbook/Ethernet-RJ45
4) Magjack resistance and voltage measurement:
- Magjack center tap (TC and RC) 3V3 voltage is supply from external regulator Q5
5) Prepared
Hardware: - 2meter length LAN cable (Cross cable type. I'm using Wifi modem).
Software: - installed Wireshark – Network protocol analyzer (new on this software, any software can recommend? )
6) Ready for testing…….
Does anyone can guide me what's the next step i can further on? or is there any other information that i miss it and you need me to provide more detail?
Early have one module but i wonder is it the Magjack cause the Mbed dead. I found out the PRT-08534 and HR911105A Magjack all the primary pin have very low resistance. I'm very worry the module will spoil again.
Thanks for your help.
Best Regards,
Wen