AW: [68300] TPU initialisation
2002-05-02 by FALE(Leopold Faschalek)
Hi
Charles,
could you please disable this advertising spam ?
greetings Leopold
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-----Ursprüngliche Nachricht-----
Von: Melear Charles-rdph40 [mailto:charles.melear@...]
Gesendet: Mittwoch, 01. Mai 2002 21:24
An: '68300@yahoogroups.com'
Betreff: RE: [68300] TPU initialisationRichard,There is no reason in the world that changing the priority of a TPU channel should affect whether or not it gets serviced.From the view point of the TPU microengine, one cannot permanently starve a TPU channel for service. In other words, if you have 1 channel at high priority, 1 channel at medium priority and the other 14 channels at low priority, a particular low priority channel will still get service.The same is NOT true at the CPU level. If TPU channel 1 is constantly (or as close to constantly as you can get) asserting its interrupt bit, a higher numbered TPU channel's ISR can fail to get serviced. The channel that will get serviced in an ISR from the CPU is the lowest numbered channel that is asserting its interrupt bit.Also, if you are writing in "C", check your assembly code around the area where you are changing the priority of the aforementioned channel. "C" can generate strange code when dealing with registers. It may be that you are using two OR instructions to change the priority bits or something like that.Anyway, the only way that changing the priority bits for a channel will stop the channel from getting serviced is to change the priority to %00.Regards,Charlie-----Original Message-----
From: Richard Armitage [mailto:rich.armitage@...]
Sent: Wednesday, May 01, 2002 11:15 AM
To: 68300@yahoogroups.com
Subject: [68300] TPU initialisationWhy would a TPU configuration not initialise if set to a high priority, but be successful if set to a lower priority?Richard Armitage
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