[Bug 1001435] New: CAN documentation (docs-latest) issues

[Bug 1001435] New: CAN documentation (docs-latest) issues

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           Summary: CAN documentation (docs-latest) issues
           Product: eCos
           Version: CVS
          Platform: All
        OS/Version: Other
            Status: UNCONFIRMED
          Severity: minor
          Priority: low
         Component: CAN
        AssignedTo: unassigned@bugs.ecos.sourceware.org
        ReportedBy: bernard.fouche@kuantic.com
                CC: ecos-bugs@ecos.sourceware.org
             Class: Advice Request


While porting an application using CAN bus, I read the latest eCos
documentation. I report here the issue I find in the eCos CAN documentation.

CAN Messages:
cyg_can_message structure now uses specific data type for data field
(cyg_can_msg_data vs cyg_uint8)

Message box configuration (cyg_can_msgbox_info_st): the two fields (count,
free) are described as being cyg_uint8, they are now cyg_uint16.

Reading hardware description information:
CYGNUM_CAN_HDI_FILT_SW has been replaced by CYGNUM_CAN_HDI_AUTBAUD.

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John Dallaway <john@dallaway.org.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEEDINFO
                 CC|                            |john@dallaway.org.uk
     Ever Confirmed|0                           |1

--- Comment #1 from John Dallaway <john@dallaway.org.uk> 2011-12-31 16:07:38 GMT ---
Bernard, thank you for reporting these documentation issues. Could you generate
a patch for the required documentation changes and attach it to this bug report
please? If you don't have an jade installation, I can test and fix any build
issues.

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--- Comment #2 from Bernard Fouché <bernard.fouche@kuantic.com> 2012-01-02 18:59:56 GMT ---
I was able to ran './makemake ; make pdfa4' so I guess my setup is fine. I'll
add a patch file when I'm done with the CAN port, I found another typo will
reading the doc.

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--- Comment #2 from Bernard Fouché <bernard.fouche@kuantic.com> 2012-01-02 18:59:56 GMT ---
I was able to ran './makemake ; make pdfa4' so I guess my setup is fine. I'll
add a patch file when I'm done with the CAN port, I found another typo will
reading the doc.

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Subject: [Bug 1001438] New: can_lpc2xxx.c: CYG_IO_GET_CONFIG_CAN_HDI returns
 incorrect support_flags value
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           Summary: can_lpc2xxx.c: CYG_IO_GET_CONFIG_CAN_HDI returns
                    incorrect support_flags value
           Product: eCos
           Version: CVS
          Platform: Other (please specify)
        OS/Version: Cortex-M
            Status: UNCONFIRMED
          Severity: minor
          Priority: low
         Component: CAN
        AssignedTo: unassigned@bugs.ecos.sourceware.org
        ReportedBy: bernard.fouche@kuantic.com
                CC: ecos-bugs@ecos.sourceware.org
             Class: Advice Request


The value returned is always

  CYGNUM_CAN_HDI_FRAMETYPE_EXT_ACTIVE
| CYGNUM_CAN_HDI_FRAMETYPE_FULLCAN

whatever the options selected in configtool, even if the driver is configured
to support only 11bits frames.

Since I'm doing the LPC17XX port of this driver (only .cdl changes plus a few
#define to locate the hardware registers of the CAN controller on the 17XX),
I'll correct this in the updated driver.

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--- Comment #3 from Bernard Fouché <bernard.fouche@kuantic.com> 2012-01-04 09:13:27 GMT ---
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--- Comment #3 from Bernard Fouché <bernard.fouche@kuantic.com> 2012-01-04 09:13:27 GMT ---
Created an attachment (id=1485)
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--- Comment #4 from Bernard Fouché <bernard.fouche@kuantic.com> 2012-01-04 09:14:09 GMT ---
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--- Comment #5 from Bernard Fouché <bernard.fouche@kuantic.com> 2012-01-04 09:14:45 GMT ---
First patch only removes spaces at EOL, to ease reviewing the second patch.

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--- Comment #5 from Bernard Fouché <bernard.fouche@kuantic.com> 2012-01-04 09:14:45 GMT ---
First patch only removes spaces at EOL, to ease reviewing the second patch.

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           Summary: LPC17XX bit band macro proposal
           Product: eCos
           Version: CVS
          Platform: Other (please specify)
        OS/Version: Cortex-M
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: low
         Component: HAL
        AssignedTo: unassigned@bugs.ecos.sourceware.org
        ReportedBy: bernard.fouche@kuantic.com
                CC: ecos-bugs@ecos.sourceware.org
             Class: Advice Request


If ever bit band macros can make it into eCos, here is a proposal.

Beside the gain in speed, IMHO the real advantage is to avoid race conditions
that can occur in a memory/register area that concerns more than one
peripheral.

For instance:

- peripheral power control register.
- ADC channel selection register (see for instance bug #1001437)

For GPIO bit band avoids having to select FIOSET or FIOCLR according to the bit
value to write.

(Maybe the proposed macro names are ugly, not located in the correct file,
etc...)

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Bernard Fouché <bernard.fouche@kuantic.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEEDINFO                    |RESOLVED
         Resolution|                            |DUPLICATE

--- Comment #7 from Bernard Fouché <bernard.fouche@kuantic.com> 2012-02-06 10:00:22 GMT ---
Documentation updated in patch provided for bug #1001453 .

*** This bug has been marked as a duplicate of bug 1001453 ***

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--- Comment #7 from Bernard Fouché <bernard.fouche@kuantic.com> 2012-02-06 10:00:22 GMT ---
Documentation updated in patch provided for bug #1001453 .

*** This bug has been marked as a duplicate of bug 1001453 ***

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 return to 'error active' mode
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--- Comment #17 from Bernard Fouché <bernard.fouche@kuantic.com> 2012-02-06 10:00:22 GMT ---
*** Bug 1001435 has been marked as a duplicate of this bug. ***

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 return to 'error active' mode
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--- Comment #18 from Sergei Gavrikov <sergei.gavrikov@gmail.com> 2012-02-06 15:56:24 GMT ---
Still need CA.

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--- Comment #6 from Bernard Fouché <bernard.fouche@kuantic.com> 2012-01-10 16:27:57 GMT ---
I met other issues while porting the LPC2XXX CAN driver to LPC17XX.

These issues aren't related to the port itself, but by the CAN controller cell
from NXP, and can be solved by a bit of documentation, hence I report them
here:

1) missing flag bit definitions in CYPKG_IO_CAN

If the CAN controller reports that it has regained bus access (for instance it
leaves 'bus off' state) or if it reports that it's moving from ERROR PASSIVE to
ERROR ACTIVE state, there are no flags defined in CYGPKG_IO_CAN to describe
this: there are flags to report that the controller entered an error
state/level, but no flags to report that the error state/level is exited. 

However a major feature of the CAN bus is to define conditions to enter error
states/levels, and to automatically exit from these.

The event handler is called because it's in the event handler that the driver
processes the details of the different situations. When an error state/level is
exited, the controller state is set to 'ACTIVE', but no flags are raised.

The result is that the user callback function is triggered with a flag value of
zero, or an event obtained from cyg_io_read() can have a value of zero for its
'flags' field.

There are 3 solutions:

- add more flags, but since the 16 bits of an event flag are all used, this
means moving from a 16 bits value to represent flags to a 32 bits value. I'm
not sure this is a good short term solution, because if such flags are added,
then existing drivers must be modified to support these new flags. However not
supporting such an important feature of the CAN bus should be fixed
sometimes...

- have the driver to avoid reporting such events, but it does not seem good
either, because the user event handler won't be able to get all relevant events
from the controller, some events of importance will be magically discarded.

- document this as a 'feature':

"If the event callback function is triggered with a flag value of zero, or if
an event read from cyg_io_read() provides a value of zero for the flags, then
the user code must check the controller state because it may have changed. If
it's not the case, then the event can simply be discarded, it can have been
triggered by the underlying hardware without always useful at the application
level."

(English isn't my mother language, please reformulate!)

2) spurious interrupts

Doing many tests, I observed that sometimes an interrupt is triggered, but in
the DSR the interrupt cause has vanished. I think that I reach such weird
situations because the CPU is clocking slowly (16MHz) compared to the CAN bit
rate I use (500Kb/s).

The result is the same than above: an event with flags set to zero.

The only explanation I have is related to the way the Interrupt and Capture
register works (ICR) is designed: it is described as being made mostly of 'AND'
gates between interrupt sources and the Bit Stream Processor of the CAN
controller.

If the interrupt cause has disappeared when this register is read, then the
register bits are set to zero but for the RX interrupt. See bug #1001447 for
another reason to think that the AND gate logic has side effects not
sufficiently described in the datasheet.

Reading ICR in the ISR is not a good solution either, the issue is clearly time
related, so reading ICR in the ISR will only increase the chance to get the
interrupt source, but not to get it 100% of the time.

Anyway, the result is similar to the first point, and solution 3 really seems
to be the only reasonable solution. (For this particular case, I think I'll
offer a CDL option to filter such interrupts directly in the DSR since the
controller state did not change, and because the upper layer code has no mean
to understand what's going on.)

Comments welcome...

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--- Comment #6 from Bernard Fouché <bernard.fouche@kuantic.com> 2012-01-10 16:27:57 GMT ---
I met other issues while porting the LPC2XXX CAN driver to LPC17XX.

These issues aren't related to the port itself, but by the CAN controller cell
from NXP, and can be solved by a bit of documentation, hence I report them
here:

1) missing flag bit definitions in CYPKG_IO_CAN

If the CAN controller reports that it has regained bus access (for instance it
leaves 'bus off' state) or if it reports that it's moving from ERROR PASSIVE to
ERROR ACTIVE state, there are no flags defined in CYGPKG_IO_CAN to describe
this: there are flags to report that the controller entered an error
state/level, but no flags to report that the error state/level is exited. 

However a major feature of the CAN bus is to define conditions to enter error
states/levels, and to automatically exit from these.

The event handler is called because it's in the event handler that the driver
processes the details of the different situations. When an error state/level is
exited, the controller state is set to 'ACTIVE', but no flags are raised.

The result is that the user callback function is triggered with a flag value of
zero, or an event obtained from cyg_io_read() can have a value of zero for its
'flags' field.

There are 3 solutions:

- add more flags, but since the 16 bits of an event flag are all used, this
means moving from a 16 bits value to represent flags to a 32 bits value. I'm
not sure this is a good short term solution, because if such flags are added,
then existing drivers must be modified to support these new flags. However not
supporting such an important feature of the CAN bus should be fixed
sometimes...

- have the driver to avoid reporting such events, but it does not seem good
either, because the user event handler won't be able to get all relevant events
from the controller, some events of importance will be magically discarded.

- document this as a 'feature':

"If the event callback function is triggered with a flag value of zero, or if
an event read from cyg_io_read() provides a value of zero for the flags, then
the user code must check the controller state because it may have changed. If
it's not the case, then the event can simply be discarded, it can have been
triggered by the underlying hardware without always useful at the application
level."

(English isn't my mother language, please reformulate!)

2) spurious interrupts

Doing many tests, I observed that sometimes an interrupt is triggered, but in
the DSR the interrupt cause has vanished. I think that I reach such weird
situations because the CPU is clocking slowly (16MHz) compared to the CAN bit
rate I use (500Kb/s).

The result is the same than above: an event with flags set to zero.

The only explanation I have is related to the way the Interrupt and Capture
register works (ICR) is designed: it is described as being made mostly of 'AND'
gates between interrupt sources and the Bit Stream Processor of the CAN
controller.

If the interrupt cause has disappeared when this register is read, then the
register bits are set to zero but for the RX interrupt. See bug #1001447 for
another reason to think that the AND gate logic has side effects not
sufficiently described in the datasheet.

Reading ICR in the ISR is not a good solution either, the issue is clearly time
related, so reading ICR in the ISR will only increase the chance to get the
interrupt source, but not to get it 100% of the time.

Anyway, the result is similar to the first point, and solution 3 really seems
to be the only reasonable solution. (For this particular case, I think I'll
offer a CDL option to filter such interrupts directly in the DSR since the
controller state did not change, and because the upper layer code has no mean
to understand what's going on.)

Comments welcome...

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From: bugzilla-daemon@bugs.ecos.sourceware.org
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Subject: [Bug 1001452] New: Select doesn't work correctly when Cyg_FlagValue
 > 32 bit
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           Summary: Select doesn't work correctly when Cyg_FlagValue > 32
                    bit
           Product: eCos
           Version: CVS
          Platform: All
        OS/Version: All
            Status: UNCONFIRMED
          Severity: minor
          Priority: low
         Component: Filesystem support
        AssignedTo: unassigned@bugs.ecos.sourceware.org
        ReportedBy: savin.zlobec@gmail.com
                CC: ecos-bugs@ecos.sourceware.org
             Class: Advice Request


Created an attachment (id\x1510)
 --> (http://bugs.ecos.sourceware.org/attachment.cgi?id\x1510)
Fix for select() when Cyg_FlagValue > 32 bit

If eCos flags value is configured to be > 32 bits (CYGIMP_FLAGS_64BIT)
select() breaks if called from thread with id >= 32. Attached patch fixes this.
BTW since there is no regular way to change flags value size this is a no issue
for most.

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[Bug 1001435] CAN documentation (docs-latest) issues

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John Dallaway <john@dallaway.org.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEEDINFO
                 CC|                            |john@dallaway.org.uk
     Ever Confirmed|0                           |1

--- Comment #1 from John Dallaway <john@dallaway.org.uk> 2011-12-31 16:07:38 GMT ---
Bernard, thank you for reporting these documentation issues. Could you generate
a patch for the required documentation changes and attach it to this bug report
please? If you don't have an jade installation, I can test and fix any build
issues.

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