topic Re: Example using LPC1778 with ethernet DP83848C in LPC Microcontrollers

Example using LPC1778 with ethernet DP83848C

aus_swsol — Mon, 27 Jan 2025 03:04:40 GMT

Good day,

Im working on LPC1778 MCU with ethernet DP83848C. Im using library from https://github.com/openxc/nxp-cdl/tree/master.

My application is to serve webpage. Enter Ip from browser, and it will open the MCU webpage.

Can you provide the example for this?

Thanks in advanced.

Re: Example using LPC1778 with ethernet DP83848C

Omar_Anguiano — Tue, 28 Jan 2025 23:18:32 GMT

Hello

LPCOpen examples can be helpful for this, there is already a webserver example on the pack: Getting started with the LPCOpen Ethernet Examples (lwip_tcpecho and webserver) - NXP Community

Best regards,
Omar

Re: Example using LPC1778 with ethernet DP83848C

aus_swsol — Mon, 03 Feb 2025 07:37:12 GMT

Good day,

I have plot the code from LPCOPEN to my Keil IDE for my LPC1778 project. Its managed to detect the PHY link up & down when I plug/unplug Ethernet cable. However, its doesnt respond to the ping when I ping the IP from windows. Below is the debug viewer. I have enabled some debug options from LWIP.

LPC177X_ETH - Initialize
Starting LWIP TCP echo server...
netif: netmask of interface set to 255.255.255.0
netif: GW address of interface set to 192.168.1.254
netif_set_ipaddr: netif address being changed
pbuf_alloc(length=1536)
pbuf_alloc(length=1536) == 10000870
lpc_rxqueue_pbuf: pbuf packet queued: 10000870 (free desc=3)
pbuf_alloc(length=1536)
pbuf_alloc(length=1536) == 10000e88
lpc_rxqueue_pbuf: pbuf packet queued: 10000e88 (free desc=2)
pbuf_alloc(length=1536)
pbuf_alloc(length=1536) == 100014a0
lpc_rxqueue_pbuf: pbuf packet queued: 100014a0 (free desc=1)
pbuf_alloc(length=1536)
pbuf_alloc(length=1536) == 10001ab8
lpc_rxqueue_pbuf: pbuf packet queued: 10001ab8 (free desc=0)
netif: added interface en IP addr 192.168.1.93 netmask 255.255.255.0 gw 192.168.1.254
netif: setting default interface en
httpd_init
tcp_bind: bind to port 80
LPC177X_ETH - IP_ADDR : 192.168.1.93

LPC177X_ETH - NET_MASK : 255.255.255.0

LPC177X_ETH - GATEWAY_IP : 192.168.1.254

LPC177X_ETH - Link connect status: 0

etharp_request: sending ARP request.
pbuf_alloc(length=28)
pbuf_alloc(length=28) == 100020d0
etharp_raw: sending raw ARP packet.
pbuf_add_header: old 100020f0 new 100020e2 (14)
ethernet_output: sending packet 100020d0
pbuf_alloc(length=42)
pbuf_alloc(length=42) == 10002110
lpc_low_level_output: Switched to DMA safe buffer, old=00000000, new=10002110
lpc_low_level_output: pbuf packet(10002120) sent, chain#=0, size = 42 (index=0)
pbuf_free(100020d0)
pbuf_free: deallocating 100020d0
LPC177X_ETH - Link connect status: 1

LPC177X_ETH - IP_ADDR : 192.168.1.93

LPC177X_ETH - NET_MASK : 255.255.255.0

LPC177X_ETH - GATEWAY_IP : 192.168.1.254

lpc_rxqueue_pbuf: pbuf packet queued: 10000870 (free desc=0)
lpc_low_level_input: Packet dropped with errors (0xffffffff)
lpc_rxqueue_pbuf: pbuf packet queued: 10000e88 (free desc=0)
lpc_low_level_input: Packet dropped with errors (0xffffffff)
lpc_rxqueue_pbuf: pbuf packet queued: 100014a0 (free desc=0)
lpc_low_level_input: Packet dropped with errors (0xffffffff)
lpc_rxqueue_pbuf: pbuf packet queued: 10001ab8 (free desc=0)
lpc_low_level_input: Packet dropped with errors (0xffffffff)
lpc_rxqueue_pbuf: pbuf packet queued: 10000870 (free desc=0)
lpc_low_level_input: Packet dropped with errors (0xffffffff)
lpc_rxqueue_pbuf: pbuf packet queued: 10000e88 (free desc=0)
lpc_low_level_input: Packet dropped with errors (0xffffffff)

thanks in advanced.

Re: Example using LPC1778 with ethernet DP83848C

aus_swsol — Tue, 04 Feb 2025 04:24:32 GMT

*update

I changed to use MII. Then the error disappeared. Now below is my printf debug log. I still cannot ping my DP83848C. What did I miss? I attached my main file, settings & my schematic diagram.

// DEBUG LOG

LPC177X_ETH - Initialize
Starting LWIP TCP echo server...
netif: netmask of interface set to 255.255.255.0
netif: GW address of interface set to 192.168.1.254
netif_set_ipaddr: netif address being changed
Chip_Clock_GetENETClockRate: 120000000
clockRate: 2500000
tmp: 48
pbuf_alloc(length=1536)
pbuf_alloc(length=1536) == 10000048
lpc_rxqueue_pbuf: pbuf packet queued: 10000048 (free desc=3)
pbuf_alloc(length=1536)
pbuf_alloc(length=1536) == 10000660
lpc_rxqueue_pbuf: pbuf packet queued: 10000660 (free desc=2)
pbuf_alloc(length=1536)
pbuf_alloc(length=1536) == 10000c78
lpc_rxqueue_pbuf: pbuf packet queued: 10000c78 (free desc=1)
pbuf_alloc(length=1536)
pbuf_alloc(length=1536) == 10001290
lpc_rxqueue_pbuf: pbuf packet queued: 10001290 (free desc=0)
netif: added interface en IP addr 192.168.1.93 netmask 255.255.255.0 gw 192.168.1.254
netif_is_up: 1
netif: setting default interface en
tcp_bind: bind to port 7
etharp_timer
IP_ADDR : 192.168.1.93
NET_MASK : 255.255.255.0
GATEWAY_IP : 192.168.1.254
Link connect status: 0
etharp_request: sending ARP request.
pbuf_alloc(length=28)
pbuf_alloc(length=28) == 100018a8
etharp_raw: sending raw ARP packet.
pbuf_add_header: old 100018c8 new 100018ba (14)
ethernet_output: sending packet 100018a8
pbuf_alloc(length=42)
pbuf_alloc(length=42) == 100018e8
lpc_low_level_output: Switched to DMA safe buffer, old=00000000, new=100018e8
lpc_low_level_output: pbuf packet(100018f8) sent, chain#=0, size = 42 (index=0)
pbuf_free(100018a8)
pbuf_free: deallocating 100018a8
Link connect status: 1
IP_ADDR : 192.168.1.93
NET_MASK : 255.255.255.0
GATEWAY_IP : 192.168.1.254
lpc_tx_reclaim_st: Freeing packet 100018e8 (index 0)
pbuf_free(100018e8)
pbuf_free: deallocating 100018e8
etharp_timer
etharp_timer
etharp_timer
etharp_timer
etharp_timer