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Discussion Groups | Freescale DSPs | Interrupts (masking them all) - 56805
Technical discussions about Freescale (Motorola) DSPs (including the DSP56000, DSP56300, DSP56600, 56800 DSPs).
'826 - when interrupts are active - Software is loosing it.... - bmbmz123 - Jul 14 14:34:00 2003
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Hello, Without interupts, sw is running ok. When I apply the interupts (archEnableInt), the sw is doing crazy stuff - some of the data is overrun, code sections are executed even though it is not supposed to. But, the sw is alive, doing other things it is supposed to!! It behaves as if some code lines are ignored! Has anyone met this before? Any ideas why? 10x boaz |
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'826 - when interrupts are active - Software is loosing it.... - bmbmz123 - Jul 14 14:35:00 2003
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Hello, Without interupts, sw is running ok. When I apply the interupts (archEnableInt), the sw is doing crazy stuff - some of the data is overrun, code sections are executed even though it is not supposed to. But, the sw is alive, doing other things it is supposed to!! It behaves as if some code lines are ignored! Has anyone met this before? Any ideas why? 10x boaz |
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Interrupts (masking them all) - 56805 - Author Unknown - Aug 7 14:28:00 2003
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I am trying to understand the data that is in the books concerning interrupts on the 56805. I am trying to disable all (software/hardware) interrupts by modifying the SR register. In the User's Manual, page 4-3, it says, "To permit mask exceptions, I bits (in the SR reg) should be set to 01. To disable mask exceptions, I bits should be set to 11." Now the confusion starts when I go to the DSP Family Manual for the 56805 and look at the description of the SR register. It says in Table 5-1 that when I bits is: Ibits Exceptions Permitted Exceptions Masked 01 IPL 0,1 None 11 IPL 1 IPL 0 When Ibits is set to 11 it still permits IPL1 which contradicts the User Manual which says it will disable mask exceptions. What am I not understading? |
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RE: Interrupts (masking them all) - 56805 - Corey, Rick - Aug 7 15:06:00 2003
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Hi Mark IPL 1 describes Non-Maskable Interrupts (NMI). I would not have said "to disable mask exceptions", I would have said "to disable maskABLE exceptions". Grammar is our friend, Motorola notwithstanding. I used to get confused between (on the one hand): Status Register IPLs (Interrupt Priority Level 0 and 1), which seem only to be maskable -vs- non-maskable, and, on the other hand: ITCN PLRs (Priority Level Registers 0 through 7) which are what I would have called "interrupt priorities". Why the Family manual dwells at length on simulating interrupt priorities in software is a mystery that will probably forever be beyond my grasp. Did early versions of the chips lack working ITCN PLRs? Rick Corey -----Original Message----- From: [mailto:] Sent: Thursday, August 07, 2003 10:29 AM To: Cc: Subject: [motoroladsp] Interrupts (masking them all) - 56805 I am trying to understand the data that is in the books concerning interrupts on the 56805. I am trying to disable all (software/hardware) interrupts by modifying the SR register. In the User's Manual, page 4-3, it says, "To permit mask exceptions, I bits (in the SR reg) should be set to 01. To disable mask exceptions, I bits should be set to 11." Now the confusion starts when I go to the DSP Family Manual for the 56805 and look at the description of the SR register. It says in Table 5-1 that when I bits is: Ibits Exceptions Permitted Exceptions Masked 01 IPL 0,1 None 11 IPL 1 IPL 0 When Ibits is set to 11 it still permits IPL1 which contradicts the User Manual which says it will disable mask exceptions. What am I not understading? _____________________________________ /groups.php3 |
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RE: Interrupts (masking them all) - 56805 - Johnson, Jerry - Aug 7 15:08:00 2003
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It is my understanding that there is a distintion between "mask exceptions" and the external interrupts. Mask Exceptions are all interrupts that can be masked by a privledge level mask bit. Since external interrupts are not by nature maskable, but can be enabled or disabled with other bits, there operation is not covered by the bit in question, whereas the other host of interrupts are enabled when the bits are 01, and disabled when the bits are 11. I hope my interpretation is correct, and does not lead to further confusion. Jerry. -----Original Message-----
I am trying to understand the data that is in the books concerning
I am trying to disable all (software/hardware) interrupts by modifying
the
Now the confusion starts when I go to the DSP Family Manual for the
Ibits Exceptions Permitted Exceptions
Masked
When Ibits is set to 11 it still permits IPL1 which contradicts the
User
What am I not understading? ------------------------ Yahoo! Groups Sponsor
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RE: Interrupts (masking them all) - 56805 - Corey, Rick - Aug 7 15:34:00 2003
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Hi
Jerry
I think the external
IRQs IRQA and IRQB are maskable by setting SR:I-bits (page 4-4, section 4.2 of my 5680x User's
Manual, Rev.2).
My old copy of the
Family manual gives some IPL 0 interrupts (NMI?) on page 7-11, section 7.4.2, Table
7-4:
Hardware Reset
COP
Illegal Instruction Trap
SWI
Hardware Stack Overflow
OnCE Trap
It lists IRQA and IRQB
as IPL 0 like every on-chip peripheral IRQ, whereas the 6 I listed as NMI are stated as being
IPL 1.
I see what you're
saying about IRQA and IRQB not being controlled by an ITCN PLR.
Table 4.2 in the 5680x
UM shows them as "controlled directly by the DSP core", not the ITCN module.
Rick
Corey
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RE: Interrupts (masking them all) - 56805 - Author Unknown - Aug 7 15:39:00 2003
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After going back and forth between the Family Manual and the User's Guide I think I have it. Section 7.3.X in the Family Manual should have been put into the User's Guide - I was unaware that there were two priorities of interrupts and that only one of those two priorities was maskable, which makes complete sense. But I only read the User's Guide which doesn't have any information about the non-maskable interrupts. Guess I made too many assuptions. Thanks for the replies, they helped. |
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RE: Interrupts (masking them all) - 56805 - Author Unknown - Aug 7 15:46:00 2003
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On Thu, 7 Aug 2003, Corey, Rick wrote: > Hi Mark > > IPL 1 describes Non-Maskable Interrupts (NMI). I would not have said "to > disable mask exceptions", I would have said "to disable maskABLE > exceptions". Grammar is our friend, Motorola notwithstanding. Yeah, that's how it came right out of the book. > I used to get confused between (on the one hand): > Status Register IPLs (Interrupt Priority Level 0 and 1), which seem > only to be maskable -vs- non-maskable, > and, on the other hand: > ITCN PLRs (Priority Level Registers 0 through 7) which are what I > would have called "interrupt priorities". That's what caused my confusion and only going back and forth between the two manuals was I able to clear up my own misunderstanding. |
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RE: Interrupts (masking them all) - 56805 - Author Unknown - Aug 7 15:51:00 2003
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On Thu, 7 Aug 2003, Corey, Rick wrote: > Hi Jerry > > I think the external IRQs IRQA and IRQB are maskable by setting SR:I-bits > (page 4-4, section 4.2 of my 5680x User's Manual, Rev.2). Yes, that's how I am masking them - but when you do that you mask all level 0 interrupts (which include all on-chip peripherals, timers, serial ports, etc) |
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RE: Interrupts (masking them all) - 56805 - Hutchings William-p23437 - Aug 7 18:07:00 2003
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The IRQA and IRQB can be
individually controlled using the IBL and IAL bit fields in the IPR. Using these bits the
IRQA and IRQB can be individually masked. The IPR also allows for masking and unmasking of
the different priority level interrupts by manipulating the CH0 through CH6
bits.
The discussions on this subject between the Family
manual and the user manual are confusing. The family manual explains how the 56800 core
operates. The 56F80x user manual details the 56F80x peripherals. The ITCN is a chip
peripheral and not part of the 56800 core. The 56800 core has several interrupt sources that it
recognizes. These are the Hardware Reset, COP Watchdog
Reset, Illegal Instruction Trap, SWI, Hardware Stack Overflow, IRQA, RQB, and the
chanel 0 through 6 interrupts. The 56800 core is fully responsible for recognizing and altering
the program flow of the core to service these interupt
sources.
The ITCN controls and manages the peripheral interrupt signals
and requests interrupt services from the 56800 core. It requests the interrupt services by
using the core CH0-CH6 interrupt signals. These are the signals that are controlled
in the IPR. At any given clock cycle the ITCN scans the input interrupt signals from the
peripherals and determines if a specifc peripheral is requesting an interrupt and what is the
highest priority interrupt request is and it in turn uses the appropriate CHX signal to
request an interrupt from the 56800 core. The ITCN will also provide an ISR vector to
the core.
The IPR and SR are core registers. The SR bits I0 and I1
bits control whether the core maskable interrupt sources are masked or unmasked. The peripheral
interrupt sources are also globally masked and unmasked since the ITCN uses the CH0-CH6 core
interrupt signals to request interrupt services from the core. The Family manual in chapter 7
describes how the core handles interrupts. This material is not in the user manual because the
user manual only has material on the chip peripherals and the chip integration.
Hope this helps on giving some back ground on what is going on.
Thanks.
[Hutchings William-p23437] -----Original Message----- From: m...@bish.net [mailto:m...@bish.net] Sent: Thursday, August 07, 2003 8:52 AM To: Corey, Rick Cc: 'Johnson, Jerry'; m...@yahoogroups.com Subject: RE: [motoroladsp] Interrupts (masking them all) - 56805 On Thu, 7 Aug 2003, Corey, Rick wrote: |
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RE: Interrupts (masking them all) - 56805 - Corey, Rick - Aug 7 18:20:00 2003
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Hi
William
Thank you! That
does make it clear. I'm printing copies of this and sticking one into each paper
manual we own.
Rick
Corey
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