Problem with DS1337 RTC with LPC17xx

[lpcware]

Content originally posted in LPCWare by vk41286 on Wed Mar 26 04:17:32 MST 2014
Hi,

I am currently learning how to interface DS1337 with LPC17xx Board. I am using uclinux2.6.33 right now. The drivers are also present in drivers/rtc/rtc-ds1307.c

Here is my .config sample :

CONFIG_RTC_LIB=y
CONFIG_RTC_CLASS=y
CONFIG_RTC_HCTOSYS=y
CONFIG_RTC_HCTOSYS_DEVICE="rtc0"
CONFIG_RTC_DEBUG=y

#
# RTC interfaces
#
CONFIG_RTC_INTF_SYSFS=y
CONFIG_RTC_INTF_PROC=y
CONFIG_RTC_INTF_DEV=y
CONFIG_RTC_INTF_DEV_UIE_EMUL=y
CONFIG_RTC_DRV_TEST=y

#
# I2C RTC drivers
#
CONFIG_RTC_DRV_DS1307=y
# CONFIG_RTC_DRV_DS1374 is not set
# CONFIG_RTC_DRV_DS1672 is not set
# CONFIG_RTC_DRV_MAX6900 is not set
# CONFIG_RTC_DRV_RS5C372 is not set
# CONFIG_RTC_DRV_ISL1208 is not set
# CONFIG_RTC_DRV_X1205 is not set
# CONFIG_RTC_DRV_PCF8563 is not set
# CONFIG_RTC_DRV_PCF8583 is not set
# CONFIG_RTC_DRV_M41T80 is not set
# CONFIG_RTC_DRV_BQ32K is not set
# CONFIG_RTC_DRV_S35390A is not set
# CONFIG_RTC_DRV_FM3130 is not set
# CONFIG_RTC_DRV_RX8581 is not set
# CONFIG_RTC_DRV_RX8025 is not set

#
# SPI RTC drivers
#

#
# Platform RTC drivers
#
CONFIG_RTC_DRV_CMOS=y
# CONFIG_RTC_DRV_DS1286 is not set
# CONFIG_RTC_DRV_DS1511 is not set
# CONFIG_RTC_DRV_DS1553 is not set
# CONFIG_RTC_DRV_DS1742 is not set
# CONFIG_RTC_DRV_STK17TA8 is not set
# CONFIG_RTC_DRV_M48T86 is not set
# CONFIG_RTC_DRV_M48T35 is not set
# CONFIG_RTC_DRV_M48T59 is not set
# CONFIG_RTC_DRV_MSM6242 is not set
# CONFIG_RTC_DRV_BQ4802 is not set
# CONFIG_RTC_DRV_RP5C01 is not set
# CONFIG_RTC_DRV_V3020 is not set

#
# on-CPU RTC drivers
#
# CONFIG_RTC_DRV_PL030 is not set
# CONFIG_RTC_DRV_PL031 is not set
# CONFIG_RTC_DRV_LPC178X is not set
# CONFIG_DMADEVICES is not set
# CONFIG_AUXDISPLAY is not set
# CONFIG_UIO is not set

Kernel Logs ::

---

Quote:

Booting kernel from Legacy Image at a0000000 ...
   Image Name:   Linux-2.6.33-arm1
   Image Type:   ARM Linux Kernel Image (uncompressed)
   Data Size:    1384224 Bytes =  1.3 MB
   Load Address: a0008000
   Entry Point:  a0008001
   Verifying Checksum ... OK
   Loading Kernel Image ... OK
OK

Starting kernel ...

�Linux version 2.6.33-arm1 (vk18434@vk18434-OptiPlex-9010) (gcc version 4.4.1 (Sourcery G++ Lite 2010q1-189) ) #238 Wed M4
CPU: ARMv7-M Processor [412fc230] revision 0 (ARMv7M)
CPU: NO data cache, NO instruction cache
Machine: NXP LPC178x/7x
Built 1 zonelists in Zone order, mobility grouping off.  Total pages: 8128
Kernel command line: lpc178x_platform=ea-lpc1788 console=ttyS0,115200 panic=10 ethaddr=C0:B1:3C:88:88:88
PID hash table entries: 128 (order: -3, 512 bytes)
Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
Memory: 32MB = 32MB total
Memory: 31076k/31076k available, 1692k reserved, 0K highmem
Virtual kernel memory layout:
    vector  : 0x00000000 - 0x00001000   (   4 kB)
    fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)
    vmalloc : 0x00000000 - 0xffffffff   (4095 MB)
    lowmem  : 0xa0000000 - 0xa2000000   (  32 MB)
    modules : 0xa0000000 - 0x01000000   (1552 MB)
      .init : 0xa0008000 - 0xa0058000   ( 320 kB)
      .text : 0xa0058000 - 0xa014b000   ( 972 kB)
      .data : 0xa014c000 - 0xa0159f20   (  56 kB)
Hierarchical RCU implementation.
NR_IRQS:41
Calibrating delay loop... 31.23 BogoMIPS (lpj=156160)
Mount-cache hash table entries: 512
NET: Registered protocol family 16
I2C: i2c-0: LPC2K I2C adapter
I2C: i2c-1: LPC2K I2C adapter
I2C: i2c-2: LPC2K I2C adapter
Switching to clocksource cm3-systick
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
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
Serial: 8250/16550 driver, 2 ports, IRQ sharing disabled
serial8250.0: ttyS0 at MMIO 0x4000c000 (irq = 5) is a 16550A
console [ttyS0] enabled
serial8250.2: ttyS1 at MMIO 0x40098000 (irq = 7) is a 16550A
lpc_mii_bus: probed
eth0: using RMII interface
eth0: LPC mac at 0x20084000 irq 28
eth0: attached PHY driver [Generic PHY] (mii_bus:phy_addr=0:01, irq=-1)
~~~~~~~~~~~~~~~~~~~~~~~~
In DS1337 Probe function
~~~~~~~~~~~~~~~~~~~~~~~~
ds1307->type=0
ds1307->type=0
tmp=8
~~~~~~~~~~~~~~~~~~~~~~~~
tmp=69
~~~~~~~~~~~~~~~~~~~~~~~~
RTC_DS1337 0-0068: rtc core: registered RTC_DS1337 as rtc0
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
rtc_device_register successfull
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
RTC_DS1337 0-0068: 56 bytes nvram
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Probe function called successfully
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
rtc-test rtc-test.0: rtc core: registered test as rtc1
rtc-test rtc-test.1: rtc core: registered test as rtc2
i2c /dev entries driver
TCP cubic registered
NET: Registered protocol family 17
t=-1608777852
RTC_DS1337 0-0068: setting system clock to 2000-01-01 01:02:45 UTC (946688565)
Freeing init memory: 320K
init started: BusyBox v1.17.0 (2014-03-25 15:47:56 IST)
~ #

---

Now I am able to set the date, but after resetting my LPC17xx, I am unable to read the present date.
i still see the below line ::

RTC_DS1337 0-0068: setting system clock to 2000-01-01 01:02:45 UTC (946688565)
Any help would be appreciated.

~ #date -u "2014-03-26 16:29:00"
Wed Mar 26 16:29:00 UTC 2014

~ # hwclock -u -w
hush: can't execute 'hwclock': No such file or directory

I am following the present page right now ::

https://developer.ridgerun.com/wiki/index.php/How_to_use_RTC_Real_Time_Clock_hardware

Thank you once again.

Any help would be appreciated.

Br
vk41286

[lpcware]

Content originally posted in LPCWare by vk41286 on Wed Apr 02 01:45:30 MST 2014
I also got some more info from cat/proc/kmsg

~ # cat /proc/kmsg 
app    bin/   dev/   etc/   mnt/   proc/  root/  sys/   usr/   var/
~ # cat /proc/kmsg
<5>Linux version 2.6.33-arm1 (vk18434@vk18434-OptiPlex-9010) (gcc version 4.4.1 (Sourcery G++ Lite 2010q1-1894
<4>CPU: ARMv7-M Processor [412fc230] revision 0 (ARMv7M)
<4>CPU: NO data cache, NO instruction cache
<4>Machine: NXP LPC178x/7x
<7>On node 0 totalpages: 8192
<7>free_area_init_node: node 0, pgdat a01c5dd4, node_mem_map a05af000
<7>  Normal zone: 64 pages used for memmap
<7>  Normal zone: 0 pages reserved
<7>  Normal zone: 8128 pages, LIFO batch:0
<4>Built 1 zonelists in Zone order, mobility grouping off.  Total pages: 8128
<5>Kernel command line: lpc178x_platform=ea-lpc1788 console=ttyS0,115200 panic=10 ethaddr=C0:B1:3C:88:88:88
<6>PID hash table entries: 128 (order: -3, 512 bytes)
<6>Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
<6>Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
<6>Memory: 32MB = 32MB total
<5>Memory: 26700k/26700k available, 6068k reserved, 0K highmem
<5>Virtual kernel memory layout:
<5>    vector  : 0x00000000 - 0x00001000   (   4 kB)
<5>    fixmap  : 0xfff00000 - 0xfffe0000   ( 896 kB)
<5>    vmalloc : 0x00000000 - 0xffffffff   (4095 MB)
<5>    lowmem  : 0xa0000000 - 0xa2000000   (  32 MB)
<5>    modules : 0xa0000000 - 0x01000000   (1552 MB)
<5>      .init : 0xa0008000 - 0xa0059000   ( 324 kB)
<5>      .text : 0xa0059000 - 0xa01b3000   (1384 kB)
<5>      .data : 0xa01b4000 - 0xa01c6e00   (  76 kB)
<6>Hierarchical RCU implementation.
<6>NR_IRQS:41
<4>Lock dependency validator: Copyright (c) 2006 Red Hat, Inc., Ingo Molnar
<4>... MAX_LOCKDEP_SUBCLASSES:  8
<4>... MAX_LOCK_DEPTH:          48
<4>... MAX_LOCKDEP_KEYS:        8191
<4>... CLASSHASH_SIZE:          4096
<4>... MAX_LOCKDEP_ENTRIES:     16384
<4>... MAX_LOCKDEP_CHAINS:      32768
<4>... CHAINHASH_SIZE:          16384
<4> memory used by lock dependency info: 3679 kB
<4> per task-struct memory footprint: 1152 bytes
<6>Calibrating delay loop... 29.79 BogoMIPS (lpj=148992)
<4>Mount-cache hash table entries: 512
<7>PM: Adding info for No Bus:platform
<6>NET: Registered protocol family 16
<7>i2c-core: driver [dummy] registered
<7>PM: Adding info for platform:serial8250.0
<7>PM: Adding info for platform:serial8250.2
<7>PM: Adding info for platform:lpc-net.0
<7>PM: Adding info for platform:lpc2k-i2c.0
<7>PM: Adding info for platform:lpc2k-i2c.1
<7>PM: Adding info for platform:lpc2k-i2c.2
<7>PM: Adding info for platform:gen_nand
<7>PM: Adding info for platform:rtc0
<7>PM: Adding info for No Bus:default
<7>PM: Adding info for i2c:i2c-0
<7>i2c i2c-0: adapter [lpc2k-i2c.0] registered
<7>PM: Adding info for i2c:0-0068
<7>i2c i2c-0: client [RTC_DS1337] registered with bus id 0-0068
<6>I2C: i2c-0: LPC2K I2C adapter
<7>PM: Adding info for i2c:i2c-1
<7>i2c i2c-1: adapter [lpc2k-i2c.1] registered
<6>I2C: i2c-1: LPC2K I2C adapter
<7>PM: Adding info for i2c:i2c-2
<7>i2c i2c-2: adapter [lpc2k-i2c.2] registered
<6>I2C: i2c-2: LPC2K I2C adapter
<7>PM: Adding info for No Bus:lo
<6>Switching to clocksource cm3-systick
<7>PM: Adding info for No Bus:mem
<7>PM: Adding info for No Bus:null
<7>PM: Adding info for No Bus:zero
<7>PM: Adding info for No Bus:full
<7>PM: Adding info for No Bus:random
<7>PM: Adding info for No Bus:urandom
<7>PM: Adding info for No Bus:kmsg
<6>NET: Registered protocol family 2
<6>IP route cache hash table entries: 1024 (order: 0, 4096 bytes)
<6>TCP established hash table entries: 1024 (order: 1, 8192 bytes)
<6>TCP bind hash table entries: 1024 (order: 3, 32768 bytes)
<6>TCP: Hash tables configured (established 1024 bind 1024)
<6>TCP reno registered
<6>RPC: Registered udp transport module.
<6>RPC: Registered tcp transport module.
<6>RPC: Registered tcp NFSv4.1 backchannel transport module.
<4>====[ backtrace testing ]===========
<4>Testing a backtrace from process context.
<4>The following trace is a kernel self test and not a bug!
<4>Backtrace: no frame pointer
<4>Testing a backtrace from irq context.
<4>The following trace is a kernel self test and not a bug!
<4>Backtrace: invalid frame pointer 0x00000006
<4>Testing a saved backtrace.
<4>The following trace is a kernel self test and not a bug!
<4> [<a005b7a1>] save_stack_trace_tsk+0x1/0x78
<4> [<ffffffff>] 0xffffffff
<4>====[ end of backtrace testing ]====
<7>PM: Adding info for No Bus:tty
<7>PM: Adding info for No Bus:console
<7>PM: Adding info for No Bus:ptmx
<7>PM: Adding info for No Bus:apm_bios
<6>Serial: 8250/16550 driver, 2 ports, IRQ sharing disabled
<7>PM: Adding info for platform:serial8250
<7>PM: Adding info for No Bus:ttyS0
<7>PM: Adding info for No Bus:ttyS1
<7>PM: Removing info for No Bus:ttyS0
<6>serial8250.0: ttyS0 at MMIO 0x4000c000 (irq = 5) is a 16550A
<6>console [ttyS0] enabled
<7>PM: Adding info for No Bus:ttyS0
<7>PM: Removing info for No Bus:ttyS1
<6>serial8250.2: ttyS1 at MMIO 0x40098000 (irq = 7) is a 16550A
<7>PM: Adding info for No Bus:ttyS1
<7>PM: Adding info for No Bus:eth0
<7>PM: Adding info for No Bus:0
<7>PM: Adding info for mdio_bus:0:01
<6>lpc_mii_bus: probed
<6>eth0: using RMII interface
<6>eth0: LPC mac at 0x20084000 irq 28
<6>eth0: attached PHY driver [Generic PHY] (mii_bus:phy_addr=0:01, irq=-1)
<7>RTC_DS1337 0-0068: probe
<6>In DS1337 Probe function
<6>~~~~~~~~~~~~~~~~~~~~~~~~
<6>In i2c_check_functionality
<6>ds1307->type=0
<7>i2c i2c-0: master_xfer[0] W, addr=0x68, len=1
<7>i2c i2c-0: master_xfer[1] R, addr=0x68, len=8
<7>i2c i2c-0: Processing total messages = 2
<7>i2c i2c-0: Processing message 0 (len=1) (flags=0)
<7>i2c i2c-0: Start sent
<7>i2c i2c-0: Start sent, sending address 0xd0
<7>i2c i2c-0: ACK ok, sending (0x00)
<7>i2c i2c-0: ACK ok, idling until next message start
<7>i2c i2c-0: Transfer successful
<7>i2c i2c-0: Processing message 1 (len=8) (flags=1)
<7>i2c i2c-0: Repeated start sent
<7>i2c i2c-0: Start sent, sending address 0xd1
<7>i2c i2c-0: ACK ok, received (0x08)
<7>i2c i2c-0: ACK ok, received (0x49)
<7>i2c i2c-0: ACK ok, received (0x01)
<7>i2c i2c-0: ACK ok, received (0x01)
<7>i2c i2c-0: ACK ok, received (0x01)
<7>i2c i2c-0: ACK ok, received (0x01)
<7>i2c i2c-0: ACK ok, received (0x00)
<7>i2c i2c-0: ACK ok, received (0x00)
<7>i2c i2c-0: ACK ok, sending stop
<7>i2c i2c-0: ACK ok, idling until next message start
<7>i2c i2c-0: Transfer successful
<7>PM: Adding info for No Bus:rtc0
<7>RTC_DS1337: dev (254:0)
<6>RTC_DS1337 0-0068: rtc core: registered RTC_DS1337 as rtc0
<6>rtc_device_register successfull
<6>RTC_DS1337 0-0068: 56 bytes nvram
<6>End of Probe function
<7>i2c-core: driver [RTC_DS1337] registered
<6>cpuidle: using governor ladder
<6>TCP cubic registered
<6>NET: Registered protocol family 17
<7>PM: Adding info for No Bus:cpu_dma_latency
<7>PM: Adding info for No Bus:network_latency
<7>PM: Adding info for No Bus:network_throughput
<6>Inside rtc_read_time function in (driver/rtc/interface.c)
<6>err=0
<6>-----------------------------In ds1307_get_time---------------------------
<7>i2c i2c-0: master_xfer[0] W, addr=0x68, len=1
<7>i2c i2c-0: master_xfer[1] R, addr=0x68, len=7
<7>i2c i2c-0: Processing total messages = 2
<7>i2c i2c-0: Processing message 0 (len=1) (flags=0)
<7>i2c i2c-0: Start sent
<7>i2c i2c-0: Start sent, sending address 0xd0
<7>i2c i2c-0: ACK ok, sending (0x00)
<7>i2c i2c-0: ACK ok, idling until next message start
<7>i2c i2c-0: Transfer successful
<7>i2c i2c-0: Processing message 1 (len=7) (flags=1)
<7>i2c i2c-0: Repeated start sent
<7>i2c i2c-0: Start sent, sending address 0xd1
<7>i2c i2c-0: ACK ok, received (0x08)
<7>i2c i2c-0: ACK ok, received (0x49)
<7>i2c i2c-0: ACK ok, received (0x01)
<7>i2c i2c-0: ACK ok, received (0x01)
<7>i2c i2c-0: ACK ok, received (0x01)
<7>i2c i2c-0: ACK ok, received (0x01)
<7>i2c i2c-0: ACK ok, received (0x00)
<7>i2c i2c-0: ACK ok, sending stop
<7>i2c i2c-0: ACK ok, idling until next message start
<7>i2c i2c-0: Transfer successful
<7>RTC_DS1337 0-0068: read: 08 49 01 01 01 01 00
<6>read secs=8, mins=49,hours=1, mday=1, mon=0, year=100, wday=0
<6>tm->tm_year=100
<6>tm->tm_year=100
<6>~~~~~~~~~~Inside rtc_tm_to_time~~~~~~~~~~~~~
<6>time=-1604280424
<6>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<6>Inside do_settimeofday function in Timekeeping.c (linux/kernel/time
<6>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
<6>Inside Hctosys.c (drivers/rtc)
<6>RTC_DS1337 0-0068: setting system clock to 2000-01-01 01:49:08 UTC (946691348)
<6>Freeing init memory: 324K

I hope my RTC is registered. But time is still showing 2000-01-01 01:49:08 UTC. I need to set the time to today's date. But no luck.

BR
Vk41286

[lpcware]

Content originally posted in LPCWare by vk41286 on Tue Apr 01 23:38:15 MST 2014
All I can see in my filesystem on board is

~ # ls
app        dev        mnt        root       sys        var
bin        etc        proc       sample.ko  usr

and inside dev I get only this.

/dev # ls -l
crw-------    1 root     root        5,   1 Jan  1 00:00 console
crw-------    1 root     root        1,   2 Mar  6  2014 kmem
crw-------    1 root     root        1,   1 Mar  6  2014 mem
crw-------    1 root     root        1,   3 Mar  6  2014 null
crw-rw-rw-    1 root     root        5,   2 Mar  6  2014 ptmx
drwxr-xr-x    2 root     root             0 Jan  1 00:00 pts
brw-------    1 root     root        1,   0 Jan  1 00:00 ram
crw-------    1 root     root        1,   8 Mar  6  2014 random
crw-------    1 root     root      166,   0 Mar  6  2014 sample
crw-rw-rw-    1 root     root        5,   0 Mar  6  2014 tty
crw-rw-rw-    1 root     root        4,  64 Jan  1 00:03 ttyS0
crw-rw-rw-    1 root     root        4,  65 Mar  6  2014 ttyS1
crw-rw-rw-    1 root     root        4,  66 Mar  6  2014 ttyS2
crw-------    1 root     root        1,   9 Mar  6  2014 urandom
crw-------    1 root     root        1,   5 Mar  6  2014 zero

in drrivers/rtc/rtc-ds1307.c file, I have put the printk in two functions namely..
1. static s32 ds1307_read_block_data(struct i2c_client *client, u8 command,u8 length, u8 *values)
2. static s32 ds1307_write_block_data(struct i2c_client *client, u8 command,u8 length, const u8 *values)

So the prinkts are not coming and this proves that read and write is not happening.

Can you please help me on how to proceed? does the rtc have to register with input subsystem ??

Br
vk41286

[lpcware]

Content originally posted in LPCWare by lkoziarz on Mon Mar 31 13:41:38 MST 2014
Have you tried mapping /dev/misc/rtc instead of /dev/rtc?  Are the RTC's node permissions correct?