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NGW100 : Problem using USART0 after firmware upgrade

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jproberge

Posted: Jul 12, 2011 - 06:11 AM

Joined: Mar 02, 2011
Posts: 19
Location: Montreal, Quebec, Canada

Hello!

Wow, I've been spending so much time on that issue lately and I haven't found anything that could help me on the forum. Please, help me Smile

Here's the situation: I updated Uboot and I used buildroot 2.3 to generate a new kernel with two more USARTs (ttyS1 and ttyS2) for my NGW100. I had no problems, I now have a new kernel that is working without any booting from SD-Card. I can see everything seems fine with my serial ports because after startup I get:

Quote:

~ # cat proc/tty/driver/atmel_serial
serinfo:1.0 driver revision:
0: uart:ATMEL_SERIAL mmio:0xFFE01000 irq:7 tx:1343 rx:0 RTS|DTR|DSR|CD|RI
1: uart:ATMEL_SERIAL mmio:0xFFE01400 irq:8 tx:0 rx:0 DSR|CD|RI
2: uart:ATMEL_SERIAL mmio:0xFFE01800 irq:9 tx:0 rx:0 DSR|CD|RI

And also, the following really sends the appropriate string to a remote terminal that is connected to /dev/ttyS0 (the tx count is also increasing):

Quote:

~ # echo "Test ttyS0" > dev/ttyS0

And by the way, I tested in the same way ttyS1 and ttyS2 and everything seems to work fine.

But now, here is the tricky part. When I try to compile any program that uses the serial port, it won't work at all. It won't send or receive anything. For example, I compiled this example from avrfreaks: http://www.avrfreaks.net/wiki/index.php/Documentation:Linux/Serial and it won't send or receive anything. I didn't forget to modify etc/inittab :

Quote:

# Inittab for the ATNGW100 development board
#
# Note: BusyBox init doesn't support runlevels. The runlevels field is
# completely ignored by BusyBox init. If you want runlevels, use sysvinit.
#
# Format for each entry: <id>:<runlevels>:<action>:<process>
#
# id == tty to run on, or empty for /dev/console
# runlevels == ignored
# action == one of sysinit, respawn, askfirst, wait, and once
# process == program to run

# Run the rcS script after kernel is booted.
::sysinit:/etc/init.d/rcS

# Run a shell on the first serial port. Comment out if you want a getty instead.
# ttyS0::respawn:-/bin/sh

# Run a shell on the g_serial port (USB gadget device)? This shell will spawn
# error message if the device is not connected.
#ttygserial::respawn:-/bin/sh

# Uncomment this to run a getty on the first serial port.
#ttyS0::respawn:/sbin/getty -L ttyS0 115200 vt100

# Run a script on shutdown.
::shutdown:/etc/init.d/rcK

But still, it doesn't work. I know my programs are good and that they are supposed to work with at least ttyS0 because I was using them before the firmware upgrade and they were working properly. But now, nothing works, neither write() or read(), and tx count is not increasing when I run my programs.

Please, do any of you had an issue like that? Do you know anything about what I could do? I really need to fix that... I would be more than happy if anyone of you knows something that could help:)

Thank you so much!

jproberge

Posted: Jul 13, 2011 - 03:18 AM

Joined: Mar 02, 2011
Posts: 19
Location: Montreal, Quebec, Canada

More information about this problem, here's my dmesg:

Quote:

~ # dmesg
Linux version 2.6.27.6.atmel.1 (asalerno@ll2029476) (gcc version 4.2.2-atmel.1.1.3.buildroot.1) #1 Mon Jun 27 14:29:58 EDT 2011
CPU: AT32AP700x chip revision C
CPU: AP7 [01] core revision 0 (AVR32B arch revision 1)
CPU: MMU configuration: Shared TLB
CPU: features: dsp simd ocd perfctr java
CPU: Running at 140.000 MHz
Physical memory:
10000000-11ffffff
Reserved memory:
10000000-1018180f: Kernel code
10181810-102193e7: Kernel data
Exception vectors start at 90013000
CPU: Paging enabled
Node 0: start_pfn = 0x10000, low = 0x12000
On node 0 totalpages: 8192
free_area_init_node: node 0, pgdat 90205568, node_mem_map 9021c000
Normal zone: 8128 pages, LIFO batch:0
Node 0: mem_map starts at 9021c000
Built 1 zonelists in Zone order, mobility grouping on. Total pages: 8128
Kernel command line: console=ttyS0 root=/dev/mtdblock1 rootfstype=jffs2
PID hash table entries: 128 (order: 7, 512 bytes)
avr32_comparator: irq 0, 140.000 MHz
console [ttyS0] enabled
Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
Memory: 30328k/30328k available (1466k kernel code, 2440k reserved, 111k data, 76k init)
SLUB: Genslabs=10, HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
Calibrating delay using timer specific routine.. 281.84 BogoMIPS (lpj=563689)
Mount-cache hash table entries: 512
net_namespace: 756 bytes
smc smc.0: Atmel Static Memory Controller at 0xfff03400
NET: Registered protocol family 16
pio0: base 0xffe02800, irq 13 chains 96..127
pio1: base 0xffe02c00, irq 14 chains 128..159
pio2: base 0xffe03000, irq 15 chains 160..191
pio3: base 0xffe03400, irq 16 chains 192..223
pio4: base 0xffe03800, irq 17 chains 224..255
pdc pdc.0: Atmel Peripheral DMA Controller enabled
at32_eic at32_eic.0: External Interrupt Controller at 0xfff00100, IRQ 19
at32_eic at32_eic.0: Handling 4 external IRQs, starting with IRQ 64
AVR32 AP Power Management enabled
tcb_clksrc: tc0 at 8.250 MHz
dw_dmac.0: DesignWare DMA Controller, 3 channels
Switched to high resolution mode on CPU 0
NET: Registered protocol family 2
IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
TCP established hash table entries: 1024 (order: 1, 8192 bytes)
TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
TCP: Hash tables configured (established 1024 bind 1024)
TCP reno registered
NET: Registered protocol family 1
JFFS2 version 2.2. (NAND) © 2001-2006 Red Hat, Inc.
msgmni has been set to 59
io scheduler noop registered
io scheduler cfq registered (default)
atmel_usart.0: ttyS0 at MMIO 0xffe01000 (irq = 7) is a ATMEL_SERIAL
atmel_usart.1: ttyS1 at MMIO 0xffe01400 (irq = Cool

is a ATMEL_SERIAL
atmel_usart.2: ttyS2 at MMIO 0xffe01800 (irq = 9) is a ATMEL_SERIAL
MACB_mii_bus: probed
eth0: Atmel MACB at 0xfff01800 irq 25 (00:04:25:1c:63:1c)
eth0: attached PHY driver [Generic PHY] (mii_bus:phy_addr=0:01, irq=-1)
MACB_mii_bus: probed
eth1: Atmel MACB at 0xfff01c00 irq 26 (00:04:25:1c:63:1d)
eth1: attached PHY driver [Generic PHY] (mii_bus:phy_addr=1:03, irq=-1)
physmap platform flash device: 00800000 at 00000000
physmap-flash.0: Found 1 x16 devices at 0x0 in 16-bit bank
Amd/Fujitsu Extended Query Table at 0x0041
number of CFI chips: 1
cfi_cmdset_0002: Disabling erase-suspend-program due to code brokenness.
RedBoot partition parsing not available
Using physmap partition information
Creating 3 MTD partitions on "physmap-flash.0":
0x00000000-0x00020000 : "u-boot"
0x00020000-0x007f0000 : "root"
0x007f0000-0x00800000 : "env"
atmel_spi atmel_spi.0: Atmel SPI Controller at 0xffe00000 (irq 3)
atmel_spi atmel_spi.0: Using bounce buffer at 0x24000000 len 4096
mtd_dataflash spi0.0: AT45DB642x (8448 KBytes) pagesize 1056 bytes
atmel_usba_udc atmel_usba_udc.0: MMIO registers at 0xfff03000 mapped at fff03000
atmel_usba_udc atmel_usba_udc.0: FIFO at 0xff300000 mapped at ff300000
at32ap700x_rtc at32ap700x_rtc.0: rtc core: registered at32ap700x_rtc as rtc0
at32ap700x_rtc at32ap700x_rtc.0: Atmel RTC for AT32AP700x at fff00080 irq 21
at32_wdt at32_wdt.0: AT32 WDT at 0xfff000b0, timeout 2 sec (nowayout=0)
atmel_mci atmel_mci.0: Atmel MCI controller at 0xfff02400 irq 28, 1 slots
Registered led device: sys
Registered led device: a
Registered led device: b
TCP cubic registered
Initializing XFRM netlink socket
NET: Registered protocol family 10
IPv6 over IPv4 tunneling driver
NET: Registered protocol family 17
NET: Registered protocol family 15
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
cpufreq: AT32AP CPU frequency driver
at32ap700x_rtc at32ap700x_rtc.0: setting system clock to 1970-01-01 00:00:00 UTC (0)
VFS: Mounted root (jffs2 filesystem).
Freeing init memory: 76K (90000000 - 90013000)
mmc0: new SD card at address e624
mmcblk0: mmc0:e624 SD512 495488KiB
mmcblk0: p1
JFFS2 write-buffering enabled buffer (1056) erasesize (8448)
eth0: link up (100/Full)
eth0: no IPv6 routers present
ip_tables: (C) 2000-2006 Netfilter Core Team
nf_conntrack version 0.5.0 (1024 buckets, 4096 max)
eth1: link up (100/Full)
warning: `proftpd' uses 32-bit capabilities (legacy support in use)
eth1: no IPv6 routers present
Node CRC 7698f808 != calculated CRC af531bbc for node at 004436e4
Node CRC def1f042 != calculated CRC b9d6792c for node at 00444194
Node CRC 22fa0e7a != calculated CRC 8143ea52 for node at 00444994
Node CRC bed26e22 != calculated CRC 8fe1dfee for node at 00445748
Node CRC 27d5ecc8 != calculated CRC 27adfff1 for node at 0044641c
Node CRC f4c988f5 != calculated CRC 8e2ea833 for node at 00446e70
Node CRC 2c8a2911 != calculated CRC 2c574976 for node at 00447714
Node CRC 50f487ff != calculated CRC 452b6803 for node at 0044814c
Node CRC 752423a2 != calculated CRC 759c7fc0 for node at 00448bdc
Node CRC ff1d9a61 != calculated CRC ff1dbb10 for node at 00449400
Node CRC f460130f != calculated CRC 28ec53ee for node at 0044a0fc
Node CRC 72a6c949 != calculated CRC fc8e47a2 for node at 0044ab7c
Node CRC be6b8ea6 != calculated CRC be8e08c3 for node at 0044b360
Node CRC c45a901a != calculated CRC 3e1f5f9b for node at 0044c118
Node CRC b6da2da2 != calculated CRC 08685640 for node at 0044cb5c
Node CRC 90761794 != calculated CRC 9076939b for node at 0044d600
Node CRC d0bfc610 != calculated CRC d08a0bd9 for node at 0044ddfc
Node CRC bb999b6a != calculated CRC 22fa0e7a for node at 004446e4
nmbd[372]: bus error at 00014e45 pc 2aaada3e sp 7fc76ba8 ecr 24
~ #

Any ideas about what's wrong?

In summary I can make ttyS0,1,2 work by writing normal Linux command like :

Quote:

~ # echo "test ttyS0" > dev/ttyS0

But when comes the time I try to do the same using a compiled c-program, it fails. Please help me Wink

jproberge

Posted: Jul 13, 2011 - 06:58 AM

Joined: Mar 02, 2011
Posts: 19
Location: Montreal, Quebec, Canada

Ok, sorry about all my posts but right now I'm doing nothing but trying to fix this. I've came up with a strange hypothesis about what might be wrong...

I compiled my current kernel using buildroot 2.3, and I'm developping my c-program with an avr32-studio that is linked with buildroot 3.0.

Do you think this could lead to some troubles? I'll try to link avr32-studio with buildroot 2.3 only and check what happens tomorrow. In the mean time, please post any comments or advices you have!

Aurevoir Smile

jproberge

Posted: Jul 14, 2011 - 12:50 AM

Joined: Mar 02, 2011
Posts: 19
Location: Montreal, Quebec, Canada

Ok, I finally tried avr32-studio with buildroot 2.3 only and I still cannot write to /dev/ttyS0 by c-programming.

Again, the only way I can send characters through the serial port is by typing standard linux commands like for instance:

Quote:

echo "testing serial port" > /dev/ttys0

At this point, I would really need some advices, ideas, hypotesis, or whatsoever. I think I tried everything I know... I want to buy some of the new NGW100 mkII, but I first need to show the capabilities of the current NGW100 to my boss. I'm not able to progress anymore. Please help.

hce

Posted: Jul 14, 2011 - 04:47 PM

Joined: Jan 07, 2003
Posts: 4580
Location: Oslo, Norway

There is a howto interface serial ports written at http://tldp.org/HOWTO/Serial-Programming-HOWTO/

You are using avr32-linux-gcc as compiler, right?

jproberge

Posted: Jul 14, 2011 - 06:03 PM

Joined: Mar 02, 2011
Posts: 19
Location: Montreal, Quebec, Canada

Hello hce!

Thank you for your reply and also for the link. Unfortunately I already have read this howto almost completely and I still have no clue about what's going on. Yes I use avr32-linux-gcc for compiling my programs.

As I said, I can write to serial ports using echo "whatever string" > /dev/ttyS0 but my c-programs that were working before my firmware upgrade don't work anymore when it comes to sending string through ttyS0,1 or 2. In fact, I have two NGW100 boards: one with the old firmware (c-programs are working perfectly with serial port, but I only have one serial port and that's a problem) and one with the firmware upgraded (with which I'm now having trouble).

I will continue to work on that issue all day long, again, if anybody could help, please take a minute to reply. Thanks!

jproberge

Posted: Jul 14, 2011 - 09:37 PM

Joined: Mar 02, 2011
Posts: 19
Location: Montreal, Quebec, Canada

PROBLEM SOLVED!!

Oh my god, I'm so happy I finally found the solution. It surely would have been obvious for a lot of you guys, but not easy for me to find out!

The problem was related to hardware flow control. I think it was supported with my previous kernel and not supported anymore by my current kernel.

So here's what I did to fix this issue, I simply added the line

Quote:

newtio.c_cflag &= ~CRTSCTS

to my program (in the serial port configuration) to avoid hardware flow control and it worked! Smile

I still don't really get why CRTSCTS wasn't bothering while I was using my old kernel and is bothering now, but still, that was the cause of this trouble and I'm happy I finally solved it.

Thanks to everybody!

P.S.: By the way, just for curiosity, If anyone knows more about the reason why I was having troubles with CRTSCTS, I would be happy to learn more.

hce

Posted: Jul 14, 2011 - 10:14 PM

Joined: Jan 07, 2003
Posts: 4580
Location: Oslo, Norway

Hardware flow control shouldn't be on by default. Weird...

jproberge

Posted: Jul 18, 2011 - 04:25 PM

Joined: Mar 02, 2011
Posts: 19
Location: Montreal, Quebec, Canada

hce, you're right.

Hardware flow control isn't on by default. I was putting it on because it wasn't behaving bad with my previous kernel, and also because the avrfreaks' Linux/serial wiki page suggests to put it on, as per example found at: [url] http://www.avrfreaks.net/wiki/index.php ... nux/Serial [/url]

Just by removing CRTSCTS or by adding

Quote:

newtio.c_cflag &= ~CRTSCTS

everything is just fine.

Thank you for your remark, maybe my last message wasn't clear enough about CRTSCTS' default status.

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