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Abort some questions of arm interrupt
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Cortex-M3
Cortex-M
Interrupt
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Abort some questions of arm interrupt
Offline
josh zhao
over 7 years ago
Note: This was originally posted on 20th June 2008 at
http://forums.arm.com
I try to understand arm interrupt,there are some questions I don't know,
1. Why the nested interrupt has to switch out of irq mode to svc mode? I think it only pushes the r14_irq into the irq stack.
2. The basic difference between a reentrant interrupt handler and a nested interrupt han-dler is that the interrupts are reenabled early on in the reentrant interrupt handler, which can reduce interrupt latency.
I can't understand that ?
thanks!
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bekiricli bekiricli
over 7 years ago
Note: This was originally posted on 23rd June 2008 at
http://forums.arm.com
Hi,
1- Because you don't know how your irq handler will use the stack. Therefore, you keep your irq mode stack as small as possible (only for your status and lr saves) and do the rest in svc mode which should have the largest (depends on your app.) amount of stack.
Regards,
Bekir
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bekiricli bekiricli
over 7 years ago
Note: This was originally posted on 23rd June 2008 at
http://forums.arm.com
Hi,
1- Because you don't know how your irq handler will use the stack. Therefore, you keep your irq mode stack as small as possible (only for your status and lr saves) and do the rest in svc mode which should have the largest (depends on your app.) amount of stack.
Regards,
Bekir
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