Quantcast
Channel: EngineerZone: Message List
Viewing all articles
Browse latest Browse all 28044

Re: RS485 on BF518 EZ-Board

$
0
0

Hello,

 

I was able to get the RS485 mode to work.  However after I run my test application, the ehternet stops working. These are the pins I'm using:

  GPIO_PG1 (gpio 17) for CTS

  GPIO_PH0 (gpio 32) for RTS

 

I don't see these pins having anything to do with ehternet.

I'm using ezbrd for BF518.

 

This is my code inside:  arch/blackfin/mach-bf518/boards/

static struct resource bfin_uart1_resources[] = {

...

#ifdef CONFIG_BFIN_UART1_CTSRTS

  { /* CTS pin */

  .start = GPIO_PG1,

  .end = GPIO_PG1,

  .flags = IORESOURCE_IO,

  },

  { /* RTS pin */

  .start = GPIO_PH0,

  .end = GPIO_PH0,

  .flags = IORESOURCE_IO,

  },

#endif

 

 

These are the tests I'm doing:

 

test1

1. "ping 192.168.1.7"  which works

2. run my test application, which sends some data and toggles RTS as expected

3. I try the ping again, and it fails

   There are no error messages on the console or in dmesg

 

ifconfig shows this after step 3 above.

root:/> ifconfig eth0

eth0      Link encap:Ethernet  HWaddr EE:CD:CB:88:99:9C

          inet addr:192.168.1.9  Bcast:192.168.1.255  Mask:255.255.255.0

          UP BROADCAST NOTRAILERS RUNNING MULTICAST  MTU:1500  Metric:1

          RX packets:801 errors:0 dropped:7 overruns:0 frame:0

          TX packets:73 errors:0 dropped:0 overruns:0 carrier:0

          collisions:0 txqueuelen:1000

          RX bytes:68258 (66.6 KiB)  TX bytes:8662 (8.4 KiB)

 

 

test2

1. Export GPIO_PG1 and GPIO_PH0 as GPIO pins.  Set them to high or low values (I tried both)

2. Ping still works

 

This test backs up my belief that those pins do not interfere with the ethernet.

 

 

test3

1. Build the kernel without support for CTS/RTS on the UART

2. Run my test app.  It sends some data.  RTS does not do anything, as expected.

3. Ping still works

 

 

Any ideas on what is causing the ethernet to stop working.

 

Thanks,

Mike


Viewing all articles
Browse latest Browse all 28044

Trending Articles



<script src="https://jsc.adskeeper.com/r/s/rssing.com.1596347.js" async> </script>